WO1993018596A1 - Apparatus and method for reducing power consumption in a mobile communications receiver - Google Patents

Apparatus and method for reducing power consumption in a mobile communications receiver Download PDF

Info

Publication number
WO1993018596A1
WO1993018596A1 PCT/US1993/001981 US9301981W WO9318596A1 WO 1993018596 A1 WO1993018596 A1 WO 1993018596A1 US 9301981 W US9301981 W US 9301981W WO 9318596 A1 WO9318596 A1 WO 9318596A1
Authority
WO
WIPO (PCT)
Prior art keywords
receiver
slot
message
transmitter
assigned
Prior art date
Application number
PCT/US1993/001981
Other languages
French (fr)
Inventor
Edward G. Tiedemann, Jr.
Lindsay A. Weaver, Jr.
Richard J. Kerr
Kenneth M. Geib
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25299893&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1993018596(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to KR1019940703124A priority Critical patent/KR0179402B1/en
Priority to DE69333633T priority patent/DE69333633T2/en
Priority to AT93907228T priority patent/ATE277464T1/en
Priority to BR9306033A priority patent/BR9306033A/en
Priority to JP51589893A priority patent/JP3193380B2/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to DK93907228T priority patent/DK0629324T3/en
Priority to AU37906/93A priority patent/AU678151B2/en
Priority to SK1053-94A priority patent/SK282130B6/en
Priority to EP93907228A priority patent/EP0629324B1/en
Publication of WO1993018596A1 publication Critical patent/WO1993018596A1/en
Priority to BG99025A priority patent/BG61745B1/en
Priority to FI944057A priority patent/FI115368B/en
Priority to HK98116167A priority patent/HK1015209A1/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/1607Supply circuits
    • H04B1/1615Switching on; Switching off, e.g. remotely
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0212Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0212Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0219Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2201/00Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70707Efficiency-related aspects
    • H04B2201/70709Efficiency-related aspects with discontinuous detection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02Arrangements for increasing efficiency of notification or paging channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/04Scheduled or contention-free access
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to mobile communications systems such as cellular telephone systems and, more specifically, to a system for reducing power consumption in a mobile or portable transceiver of such a system.
  • the transceivers are only sporadically active. For example, a cellular telephone remains idle for significant periods of time when no call is in progress. During such idle periods the cellular telephone consumes substantially the same amount of power as during active periods. However, to ensure that a transceiver receives sporadically transmitted messages, it must continuously monitor a channel.
  • a digital cellular telephone system such as that described in U.S. Patent No. 5,056,031 entitled "Method and Apparatus for Controlling Transmission Power in a CDMA Cellular Telephone System" and copending U.S.
  • messages transmitted by a base station may include those for alerting the mobile station to the presence of an incoming call and those for periodically updating system parameters in the mobile station.
  • a mobile station installed in a vehicle may be powered by the vehicle's electrical system, prolonged use of the mobile station when the vehicle is not operating may drain the vehicle's battery.
  • many mobile stations are portable and powered by an internal battery.
  • Personal Communications Systems (PCS) handsets are almost exclusively battery powered. In any such stations it is desirable to minimize power consumption to increase battery life.
  • PCS Personal Communications Systems
  • a mobile station may consume significant amounts of power by continuously monitoring the channel for incoming messages.
  • the resulting power drain on the battery reduces the time available for actively handling calls.
  • a system that reduces power consumption by periodically monitoring the channel for incoming messages during idle periods would be highly desirable.
  • the present invention reduces receiver power consumption in a communication system having a transmitter communicating with one or more remote receivers on a channel.
  • Each receiver periodically enters an "active state" during which it can receive messages on the channel.
  • the transmitter sends one or more messages to each receiver during each successive occurrence of the active state of the receiver.
  • the "inactive state" of a receiver the time period between successive active states, the transmitter does not send any messages to that receiver, although it may send messages to other receivers in the system that are in the active state.
  • the receiver may perform any action not requiring coordination with the transmitter.
  • the receiver may use the inactive state to reduce its power consumption by removing power from one or more components, such as those components used for monitoring the channel.
  • the channel is divided in the time dimension into a continuous stream of "slots.”
  • the receiver has a "slot cycle,” which comprises two or more slots.
  • the receiver is assigned one slot of its slot cycle during which it must monitor the channel.
  • the receiver is generally in the active state only during its assigned slot and in the inactive state during the remainder of its slot cycle. However, if the message itself directs the receiver to perform some further action, it must remain in the active state until it completes the action.
  • the transmitter and receiver slot timing should be aligned in the time dimension to ensure that transmitted messages are not lost but are received in the assigned slot.
  • the transmitter and receiver slot timing may be continuously synchronized.
  • the receiver may operate independently during the inactive state and some timing drift may occur relative to the transmitter.
  • the receiver may periodically synchronize its slot timing to that of the transmitter.
  • the receiver may acquire and track a pilot signal that the transmitter provides on a separate pilot channel.
  • the receiver may conserve power by removing power from the pilot signal tracking circuitry during the inactive state.
  • the receiver may maintain its slot timing using an internal clock source.
  • the receiver may apply power to this circuitry and reacquire the pilot signal.
  • the receiver may then realign its timing with that of the transmitter by synchronizing it to the pilot signal.
  • the receiver may perform any other actions or initializations to prepare it to receive a message at the beginning of its assigned slot.
  • Each message may also contain a field indicating whether another message is forthcoming. If an additional message is forthcoming, the receiver remains in the active state into the next slot. If there are no additional messages, the receiver may immediately enter the inactive state for the remainder of the slot cycle.
  • each receiver is pseudorandomly assigned a slot in its slot cycle.
  • An identification number uniquely associated with the receiver may be provided to a hash function, " which pseudorandomly produces the assigned slot number.
  • the slot cycle of a receiver may change during operation. For example, the receiver may select a new slot cycle" and send a message to the transmitter notifying it of the new slot cycle. Although either the receiver or transmitter may change the slot cycle of the receiver, both must have the slot cycle information.
  • Figure 1 illustrates the slotted transmission of messages in an embodiment of the present invention having a transmitter and two receivers.
  • Figures 2a-c illustrate the timing relationship between transmitter slot signals and receiver slot signals at successive points in time;
  • Figure 3 illustrates an embodiment of the present invention having a message channel and a pilot channel
  • Figure 4 illustrates the transition from the inactive state to the active state at the assigned slot of a receiver
  • Figures 5a-b illustrate a message having a sequence number field.
  • a transmitter 10 may send messages to two receivers 12 and 14. Other embodiments may have a greater or lesser number of receivers.
  • transmitter 10 is disposed in a base station or cell site (not shown) and transmits messages to receivers 12 and 14, disposed in mobile stations (not shown).
  • the mobile stations may be cellular telephones or personal communications system (PCS) handsets.
  • the base station transmits these messages, which may provide the mobile station with an indication of an incoming telephone call with a requirement to take special control actions, or with updated system parameters, on a "paging" channel.
  • the paging channel transmissions are represented by the broken lines in Fig. 1.
  • Receivers 12 and 14 have 32-bit electronic serial numbers (ESN) 16 and 18, respectively.
  • the ESN of each receiver is different from that of all other receivers.
  • a call to a cellular telephone is routed to a mobile telephone switching office (MTSO, not shown).
  • the MTSO in turn routes the call to a base station within transmitting range of the mobile station.
  • Either the MTSO or the base station includes means for converting the telephone number of the cellular telephone into the mobile station ESN.
  • receivers 12 and 14 each select a slot cycle index 20 and 22 respectively.
  • Slot cycle indices 20 and 22 determine the length of the slot cycles 24 and 26 of receivers 12 and 14 respectively.
  • a processor in a mobile station may select a slot cycle index using an algorithm or it may use a predetermined value. For example, both slot cycle indices 20 and 22 have the value "1" in Fig. 1. A range of 1-7 is preferred for slot cycle indices 20 and 22.
  • the maximum slot cycle index, MAX_SSI is "7."
  • a value of "0" may be chosen to indicate that a receiver will continuously monitor the channel, i.e., the slotted communication method of the present invention will be bypassed.
  • each mobile station transmits the slot cycle index selected by its receiver to the base station, which requires this information to access the receivers.
  • Receivers 12 and 14 compute slot cycles 24 and 26, which are 5 x 2(slot cycle index 20) an d 5 x 2(slot cycle index 22) s l ots j n l eng th respectively.
  • Transmitter 10 generates timing 28, which comprises a stream of periodic slots 30.
  • receiver 12 generates timing 32, which comprises a stream of periodic slots 34
  • receiver 14 generates timing 36, which comprises a stream of periodic slots 38.
  • Slots 30, 34, and 38 are equal in length and are preferably 200 milliseconds (ms) in length.
  • Receiver 12 monitors the channel during an assigned slot 40, which occurs once in each slot cycle 24.
  • Receiver 14 monitors the channel during an assigned slot 42, which occurs once in each slot cycle 26.
  • Assigned slots 40 and 42 are pseudorandomly selected to facilitate their even distribution among the slots of a slot cycle having a given length. Although many pseudorandom methods for selecting assigned slots 40 and 42 are suitable, a method using Equations 1 and 2, below, is preferred. Equations 1 and 2 may be used by transmitter 10 and receivers 12 and
  • System time may be the current value of a counter (not shown) in each transmitter 10 and receiver 12 and 14. Such a counter (not shown) can run for thousands of years without repeating if it has a sufficiently large number of bits, and can easily be constructed by one skilled in the art.
  • transmitter 10 may synchronize its counter (not shown) to a universal broadcast time source, such as that produced by the Global Positioning System (GPS).
  • GPS Global Positioning System
  • Receivers 12 and 14 synchronize their counters (not shown) to that of transmitter 10, as discussed below.
  • PGSLOT 2 MA -SSI x ((40503 x (L ⁇ H ⁇ D)) mod 2 l ⁇ ) / 2- e (1)
  • MAX_SSI is the maximum slot cycle index
  • L is the least significant 16 bits of the ESN
  • H is the most significant 16 bits of the ESN
  • D is a number 6 times the least significant 12 bits of the ESN
  • N is system time; X represents the largest integer less than or equal to X; ⁇ represents a bitwise exclusive-OR operation; and all other operations are integer arithmetic.
  • Equation 1 may be solved for PGSLOT, which represents the time at which the assigned slot occurs as measured from the beginning of the slot cycle of maximum length. Equation 2, below, relates this time to system time.
  • Receiver 12 uses ESN 16 to calculate its PGSLOT and receiver 14 uses ESN 18.
  • PGSLOT has a maximum value of 5 x 2 S SI_MAX s ⁇ ots (2SSI_MAX seconds).
  • receivers 12 and 14 may choose shorter slot cycles, as exemplified by Fig. 1 where both slot cycle 24 and 26 are 10 slots (2 seconds) in length.
  • Assigned slots 40 and 42 occur periodically within slot cycles 24 and 26, respectively. Equation 2 below may be used to determine when assigned slots 40 and 42 occur relative to system time.
  • N is the current slot.
  • the first slot of all possible slot cycles occurs at the beginning of system time, i.e., when N equals zero.
  • Receivers 12 and 14 each substitute -slot cycle indices 20 and 22 respectively for SSI in Equation 2.
  • the value of PGSLOT is also unique to each receiver 12 and 14 because it is derived from ESN 16 and 18, respectively.
  • Receivers 12 and 14 each may compute Equation 2 once each slot cycle and, if true, monitor the channel for incoming messages because the current slot is its assigned slot 40 or 42, respectively. Of course, receivers 12 and 14 need not compute Equation 2 each slot cycle.
  • Receivers 12 and 14 may compute Equation 2 at some initial point in time and, upon Equation 2 being true, may thereafter monitor the channel periodically at intervals of slot cycle 24 and slot cycle 26.
  • the computations discussed above in reference to mobile station receivers 12 and 14 are also performed by base station transmitter 10. For example, when a caller dials a telephone number associated with a mobile station, the MTSO routes the call to a base station in the vicinity of the mobile station. The base station retrieves the ESN and slot cycle of the mobile station by providing a lookup table with the telephone number. The base station computes the assigned slot in which it must transmit to the mobile station using Equations 1 and 2. When the base station slot timing generates the assigned slot, the transmitter sends a message that indicates the presence of an incoming call to the mobile station.
  • mobile station receiver 12 When mobile station receiver 12, for example, selects slot cycle index 20, it transmits the value selected to the base station on another channel (not shown). The base station acknowledges the selection by transmitting an acknowledgment message to mobile station receiver 12. Transmitter 10 begins using the newly selected slot cycle index after transmitting the acknowledgment. However, if receiver 12 does not receive such an acknowledgment because of a transmission error, receiver 12 will continue to use the old slot cycle index. Messages may be lost if transmitter 10 does not compute the assigned slot of receiver 12 using the same slot cycle index that receiver 12 uses to compute its assigned slot. To facilitate recovery from such an error, receiver 12 selects a default slot cycle index of "1" if it does not receive an acknowledgment. A slot cycle index of "1" ensures that an assigned slot as computed by transmitter 10 will coincide with an assigned slot as computed by receiver 12. Actually all that is required is that the receiver uses a slot cycle index less than or equal to that of the transmitter for the slots to line up.
  • Slot timing 28 of base station transmitter 10 is synchronized to slot timing 32 during transmission of messages to mobile station receiver 12 and to slot timing 36 during transmission of messages to mobile station receiver 14.
  • Transmitter 10 synchronizes slot timing 28 to its system time counter (not shown).
  • Figs. 2a-2d represent successive "snapshots" in time and show a portion of the transmitter and receiver signals at these successive points in time.
  • the arrow 72 is simply a fixed point in time that serves as a common reference point for facilitating comparison of the signals throughout Figs. 2a-2d.
  • the signals can be thought of as moving in time from left to right towards arrow 72, as though on conveyor belts.
  • a base station transmitter such as base station transmitter
  • Fig. 1 transmits a pilot signal 50, synchronized to the system clock, on a separate pilot channel.
  • Base station transmitter 10 synchronizes transmitter slot signal 52, which has slots 54, 56, and 58, to pilot signal 50.
  • pilot signal 50 is shown as having the same period as slots 54, 56, and 58, it may be any type of signal from which such a periodic signal could be derived.
  • Slot 54 has messages 60, 62, 64, and 66. Although at least one message must be transmitted in each assigned slot, the maximum number of messages that may be transmitted in a slot is limited only by the transmission rate and slot length.
  • Fig. 2a shows the signals at a point in time during which the receiver is in the inactive state.
  • Receiver slot signal 68 is shown in broken lines to represent the inactive state because in the inactive state the receiver may conserve power by removing power from circuitry (not shown) that monitors the channel for messages. It may also remove power from circuitry (not shown) that tracks pilot signal 50. It is emphasized that the receiver may perform any action in the inactive state that does not require coordination with the transmitter.
  • receiver slot signal 68 may not be precisely aligned with transmitter slot signal 52 because in the inactive state the receiver is not tracking pilot signal 50 to which it could otherwise synchronize slot signal 68. However, the maximum time by which these signals may drift apart is substantially less than one slot.
  • Slot 70 is the assigned slot of the receiver and may correspond to assigned slot 40 or 42 of Fig. 1.
  • the transmitter will send a message at the point in time when the first message, message 66, reaches arrow 72.
  • the transmitter timing may determine this point by counting slots of the slot cycles from the beginning of system time. For example, slot zero occurred for the first time at the beginning of system time and repeats with a periodicity of the slot cycle.
  • the receiver timing may have drifted slightly from the transmitter timing during the preceding inactive state, they are synchronized long before the occurrence of the next slot. Typically the drift is only about 2 microseconds for a receiver using a slot cycle of 2 seconds. Therefore, the receiver can determine the point in time at which it may expect to receive a message, i.e., arrow 72, with a precision well within a single slot. It can thus begin to transition to the active state shortly before this occurrence.
  • Fig. 2b shows the same signals at a point in time later than that of Fig. 2a.
  • the receiver began the transition to the active state and applied power to the circuitry that tracks pilot signal 50. It is preferred that the transition begin after the beginning of slot 74, the slot preceding assigned slot 70, has reached arrow 72. However, the transition may begin at an earlier time.
  • the receiver may apply power to circuitry, perform hardware resets, perform initialization routines, reacquire pilot signal 50, synchronize signals, or perform any action necessary to prepare it to receive messages in assigned slot 70 at arrow 72.
  • the transition state 80 is shown in Fig. 4 beginning in slot4, the slot preceding the assigned slot, slots-
  • the receiver is in the inactive state 81 before this time.
  • the receiver in is the active state 82, and returns to inactive state 84 at the end of slots-
  • a receiver is in the active state only during its assigned slot.
  • Fig. 2c which shows the signals at a point in time later than that of Fig. 2b
  • receiver slot signal 68 is completely synchronized to transmitter slot signal 52.
  • the receiver has reacquired and is tracking pilot signal 50.
  • the receiver is in the active state because it is prepared to receive a message in assigned slot 70 at arrow 72.
  • the receiver is receiving message 60. It has already received messages 62, 64, and 66. Each message may have several fields, for example, fields 90, 92, 94, and 96 of message 62.
  • the fields contain the address of the receiver and instructions for the receiver.
  • the field may contain system parameters for use by the receiver. Alternatively, the message field may contain the phone number when the transmitter is "paging" the receiver.
  • the receiver decodes each message and may perform one or more actions according to the values contained in the fields.
  • FIG. 3 shows a block diagram of a system for generating the signals described in Figs. 2a-2d.
  • the system comprises base station transmitter 120 and mobile station receiver 122.
  • a user may, for example, initiate a call to the mobile station having receiver 122.
  • a call is received at the MTSO (not shown) and includes the telephone number of the mobile station being called.
  • the MTSO routes the call to a base station.
  • the MTSO obtains the mobile station ESN and slot cycle in response to the telephone number of the mobile station.
  • the MTSO then provides the base station with input information 124, which includes the ESN and slot cycle of the mobile station.
  • Information 124 is received by the transmitter processor 126, which may be a microprocessor or other control circuitry. Processor 126 may use the hash function of Equations 1-2 above to obtain the assigned slot of the mobile station.
  • Transmitter slot signal generator 130 generates an assigned slot signal 129, which may interrupt processor 126 when processor 126 must provide messages 128, i.e., a short time before the assigned slot. Transmitter slot signal generator 130 may have a counter for maintaining a slot count. Alternatively, the count may be maintained by processor 126. Transmitter slot signal generator 130 synchronizes messages 128 to the system clock 138, which is generated by transmitter clock source 140. Pilot signal generator 136 generates pilot signal 134, which is also synchronized to system clock 138. Summer 142 adds pilot signal 134 to synchronized message signal 132 and provides the sum signal 144 to a paging channel transmitter 141. Paging channel transmitter 141 broadcasts the transmitted messages 143.
  • paging channel receiver 146 receives transmitted messages 143.
  • the power controller 147 may remove power from one or more components, such as receiver 146.
  • Received message signal 150 is provided to receiver slot signal generator 152.
  • receiver slot signal generator 152 maintains the slot count in synchronization with local clock signal 156, which is generated by receiver clock source 158.
  • receiver slot signal generator 152 extracts the messages and pilot signal from received message signal 150 and provides synchronized messages 160 in synchronization with the pilot signal. Synchronized messages 160 are provided to processor 162.
  • Processor 162 provides output signals 164 in response to the messages. Signals 164 alert the mobile station to the type of action it must perform.
  • the mobile station may activate a "traffic" channel for conducting subsequent voice communication in response to signals 164 that alert it to the presence of an incoming call.
  • Each message may have a MORE_PAGES field, which indicates to the receiver whether an additional message will be transmitted following the current message. A zero in this field indicates that there are no additional messages. If the receiver decodes a zero in the MORE PAGES field, it may then immediately enter the inactive state without waiting until the end of the current slot. If the message has a nonzero value in the MORE_PAGES field, the receiver remains in the active state. If a message having a nonzero value in the MORE_PAGES field is received at the end of the assigned slot, the receiver may remain in the active state into the slot following the assigned slot. It is preferred that the receiver remain in the active state no longer than two slots so that the receiver does not waste power by ' being active. This is in case the message containing a MORE_PAGES field equal to "0" was received in error and discarded.
  • message 66 has a nonzero value of "1" in MORE_PAGES field 98. Therefore, the receiver remains in the active state to receive message 64, which has a nonzero value of "1" in MORE_PAGES field 100. The receiver remains in the active state to receive message 62, which has a nonzero value in MORE_PAGES field 96. Similarly, the receiver remains active to receive message 60, which occurs at the end of the assigned slot 70. The receiver remains in the active state after slot 99 reaches arrow 72 because MORE_PAGES field 101 of message 60 has a nonzero value of "1.” The receiver receives message 102 at the beginning of slot 99.
  • the receiver may enter the inactive state after receiving message 102 because MORE_PAGES field 104 of message 102 has a value of "0."
  • Messages may include an address field having the ESN of the receiver and one or more action fields instructing the receiver to perform other actions.
  • the receiver performs any actions that occur in messages having the receiver's ESN.
  • the addressing function may be performed by the transmitter sending the phone number.
  • the receiver performs any actions that occur in messages having a phone number assigned to the receiver.
  • These actions may direct the receiver to remain active to receive additional messages. Since the receiver now receives all slots, these messages can be sent at any time.
  • the actions may direct a receiver to become active for a while and then enter the slotted mode of operation. In Fig.
  • the receiver (not shown) receives a message 110 during assigned slot 112 of slot cycle "n."
  • Message 110 has an address field 120, which contains an address 122.
  • Message 110 also has an action field 124, which contains an instruction 126. If address 122 corresponds to the ESN of the receiver, the receiver performs instruction 126.
  • Instruction 126 may direct the mobile station to update system parameters or "overhead" information.
  • a message directing the mobile station to update the overhead information may also have one or more fields containing "sequence numbers.” The receiver reads the sequence number contained in each such field and stores the value.
  • the receiver When the next message containing such a sequence number is received during the next slot cycle, the receiver reads the sequence number in each sequence number field and compares them to the corresponding sequence numbers that were previously stored, usually during the previous slot cycle. If any of the sequence numbers have changed, the receiver provides an indication to the processor in the mobile station with which it is associated to update the overhead information.
  • the message has sequence number field 114, which contains a sequence number 128.
  • the receiver stores sequence number 128 in a location corresponding to the sequence number field 114.
  • Fig. 5b represents the next slot cycle, slot cycle "n+1.”
  • the receiver receives a message 116 during assigned slot 112, which contains sequence number 130 in sequence number field 118.
  • Sequence number field 118 corresponds to sequence number field 114 of message 110 received during the previous slot cycle.
  • the receiver compares sequence numbers 128 and 130 and, if different, provides an indication to the processor (not shown) that the mobile station is to remain in the active state.
  • the receiver may then wait for additional messages having the new overhead information or perform any other action as directed by the processor.
  • the receiver need not perform any additional action if the values in corresponding sequence number fields of messages received in successive slot cycles remain unchanged.

Abstract

A system for reducing receiver power consumption in communication system having a transmitter (141) and one or more receivers (146) schedules periodic message in 'slot'. Each receiver is assigned a slot during which it monitors the transmission. The transmitter (141) transmits messages to the receiver only during the assigned slots. The receiver is in an 'active state' during its assigned slot. During the 'inactive state', which is the time period between successive occurrences of its assigned slot, the receiver may perform any action not requiring coordination with transmitter. At a time during the inactive state shortly before the assigned slot, the receiver applies power to these components and performs initialization. Such initialization may include reacquiring a pilot channel signal to which the receiver may synchronize itself if its timing signal have drifted out of synchronization with those of the transmitter during the preceding inactive state.

Description

APPARATUS AND METHOD FOR REDUCING POWER CONSUMPTION IN A MOBILE COMMUNICATIONS RECEIVER
BACKGROUND OF THE INVENTION
The present invention relates to mobile communications systems such as cellular telephone systems and, more specifically, to a system for reducing power consumption in a mobile or portable transceiver of such a system. In many communications systems, the transceivers are only sporadically active. For example, a cellular telephone remains idle for significant periods of time when no call is in progress. During such idle periods the cellular telephone consumes substantially the same amount of power as during active periods. However, to ensure that a transceiver receives sporadically transmitted messages, it must continuously monitor a channel. In a digital cellular telephone system, such as that described in U.S. Patent No. 5,056,031 entitled "Method and Apparatus for Controlling Transmission Power in a CDMA Cellular Telephone System" and copending U.S. Patent Application Serial No. 07/543,496 entitled "System and Method for Generating Signal Waveforms in a CDMA Cellular Telephone System," both assigned to the assignee of the present invention, messages transmitted by a base station may include those for alerting the mobile station to the presence of an incoming call and those for periodically updating system parameters in the mobile station. While a mobile station installed in a vehicle may be powered by the vehicle's electrical system, prolonged use of the mobile station when the vehicle is not operating may drain the vehicle's battery. Furthermore, many mobile stations are portable and powered by an internal battery. Personal Communications Systems (PCS) handsets are almost exclusively battery powered. In any such stations it is desirable to minimize power consumption to increase battery life.
A mobile station may consume significant amounts of power by continuously monitoring the channel for incoming messages. The resulting power drain on the battery reduces the time available for actively handling calls. A system that reduces power consumption by periodically monitoring the channel for incoming messages during idle periods would be highly desirable. These problems and deficiencies are clearly felt in the art and are solved by the present invention in the manner described below. SUMMARY OF THE INVENTION
The present invention reduces receiver power consumption in a communication system having a transmitter communicating with one or more remote receivers on a channel. Each receiver periodically enters an "active state" during which it can receive messages on the channel. The transmitter sends one or more messages to each receiver during each successive occurrence of the active state of the receiver. Although we generally refer herein to a single receiver, it is understood that more than one such receiver in a system may be active simultaneously. During the "inactive state" of a receiver, the time period between successive active states, the transmitter does not send any messages to that receiver, although it may send messages to other receivers in the system that are in the active state. In the inactive state, the receiver may perform any action not requiring coordination with the transmitter. The receiver may use the inactive state to reduce its power consumption by removing power from one or more components, such as those components used for monitoring the channel.
The channel is divided in the time dimension into a continuous stream of "slots." The receiver has a "slot cycle," which comprises two or more slots. The receiver is assigned one slot of its slot cycle during which it must monitor the channel. The receiver is generally in the active state only during its assigned slot and in the inactive state during the remainder of its slot cycle. However, if the message itself directs the receiver to perform some further action, it must remain in the active state until it completes the action.
The transmitter and receiver slot timing should be aligned in the time dimension to ensure that transmitted messages are not lost but are received in the assigned slot. In certain embodiments, the transmitter and receiver slot timing may be continuously synchronized. However, in other embodiments, the receiver may operate independently during the inactive state and some timing drift may occur relative to the transmitter. In such embodiments, the receiver may periodically synchronize its slot timing to that of the transmitter. In a digital cellular telephone system, for example, the receiver may acquire and track a pilot signal that the transmitter provides on a separate pilot channel. In the inactive state, the receiver may conserve power by removing power from the pilot signal tracking circuitry during the inactive state. In the inactive state, the receiver may maintain its slot timing using an internal clock source. A short time before the next occurrence of its assigned slot, the receiver may apply power to this circuitry and reacquire the pilot signal. The receiver may then realign its timing with that of the transmitter by synchronizing it to the pilot signal. In addition to applying power and reacquiring a pilot signal, the receiver may perform any other actions or initializations to prepare it to receive a message at the beginning of its assigned slot.
Each message may also contain a field indicating whether another message is forthcoming. If an additional message is forthcoming, the receiver remains in the active state into the next slot. If there are no additional messages, the receiver may immediately enter the inactive state for the remainder of the slot cycle.
In a system having multiple receivers, each receiver is pseudorandomly assigned a slot in its slot cycle. An identification number uniquely associated with the receiver may be provided to a hash function, " which pseudorandomly produces the assigned slot number.
All receivers in the system need not have the same slot cycle. Furthermore, the slot cycle of a receiver may change during operation. For example, the receiver may select a new slot cycle" and send a message to the transmitter notifying it of the new slot cycle. Although either the receiver or transmitter may change the slot cycle of the receiver, both must have the slot cycle information.
The foregoing, together with other features and advantages of the present invention, will become more apparent when referring to the following specification, claims, and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of our invention, we now refer to the following detailed description of the embodiments illustrated in the accompanying drawings, wherein:
Figure 1 illustrates the slotted transmission of messages in an embodiment of the present invention having a transmitter and two receivers. Figures 2a-c illustrate the timing relationship between transmitter slot signals and receiver slot signals at successive points in time;
Figure 3 illustrates an embodiment of the present invention having a message channel and a pilot channel; Figure 4 illustrates the transition from the inactive state to the active state at the assigned slot of a receiver; and
Figures 5a-b illustrate a message having a sequence number field.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In Fig. 1, a transmitter 10 may send messages to two receivers 12 and 14. Other embodiments may have a greater or lesser number of receivers. In a digital cellular telephone system such as discussed in the above- referenced U.S. Patent and copending application, transmitter 10 is disposed in a base station or cell site (not shown) and transmits messages to receivers 12 and 14, disposed in mobile stations (not shown). The mobile stations may be cellular telephones or personal communications system (PCS) handsets. The base station transmits these messages, which may provide the mobile station with an indication of an incoming telephone call with a requirement to take special control actions, or with updated system parameters, on a "paging" channel. The paging channel transmissions are represented by the broken lines in Fig. 1. Receivers 12 and 14 have 32-bit electronic serial numbers (ESN) 16 and 18, respectively. The ESN of each receiver is different from that of all other receivers. In a cellular telephone system, a call to a cellular telephone is routed to a mobile telephone switching office (MTSO, not shown). The MTSO in turn routes the call to a base station within transmitting range of the mobile station. Either the MTSO or the base station includes means for converting the telephone number of the cellular telephone into the mobile station ESN.
During a mobile station initialization or "registration" as it is known in the cellular communications art, or at other times as required, receivers 12 and 14 each select a slot cycle index 20 and 22 respectively. Slot cycle indices 20 and 22 determine the length of the slot cycles 24 and 26 of receivers 12 and 14 respectively. A processor in a mobile station may select a slot cycle index using an algorithm or it may use a predetermined value. For example, both slot cycle indices 20 and 22 have the value "1" in Fig. 1. A range of 1-7 is preferred for slot cycle indices 20 and 22. Thus, the maximum slot cycle index, MAX_SSI is "7." A value of "0" may be chosen to indicate that a receiver will continuously monitor the channel, i.e., the slotted communication method of the present invention will be bypassed. In a cellular telephone system, each mobile station transmits the slot cycle index selected by its receiver to the base station, which requires this information to access the receivers.
Receivers 12 and 14 compute slot cycles 24 and 26, which are 5 x 2(slot cycle index 20) and 5 x 2(slot cycle index 22) slots jn length respectively. Transmitter 10 generates timing 28, which comprises a stream of periodic slots 30. Similarly, receiver 12 generates timing 32, which comprises a stream of periodic slots 34, and receiver 14 generates timing 36, which comprises a stream of periodic slots 38. Slots 30, 34, and 38 are equal in length and are preferably 200 milliseconds (ms) in length. Thus, using a range of slot cycle indices of 1-7 in the above function yields a range of slot cycles of between 10 and 640 slots in length, which corresponds to a time range of between 2 and 128 seconds using 200 ms slots.
Receiver 12 monitors the channel during an assigned slot 40, which occurs once in each slot cycle 24. Receiver 14 monitors the channel during an assigned slot 42, which occurs once in each slot cycle 26. Assigned slots 40 and 42 are pseudorandomly selected to facilitate their even distribution among the slots of a slot cycle having a given length. Although many pseudorandom methods for selecting assigned slots 40 and 42 are suitable, a method using Equations 1 and 2, below, is preferred. Equations 1 and 2 may be used by transmitter 10 and receivers 12 and
14 to determine the periodic points in time, relative to "system time," at which assigned slots 40 and 42 occur. At the beginning of system time, the first slot (sloto) of each possible slot cycle occurred simultaneously. System time may be the current value of a counter (not shown) in each transmitter 10 and receiver 12 and 14. Such a counter (not shown) can run for thousands of years without repeating if it has a sufficiently large number of bits, and can easily be constructed by one skilled in the art. In addition, transmitter 10 may synchronize its counter (not shown) to a universal broadcast time source, such as that produced by the Global Positioning System (GPS). Receivers 12 and 14 synchronize their counters (not shown) to that of transmitter 10, as discussed below.
PGSLOT = 2MA -SSI x ((40503 x (L Θ H Θ D)) mod 2) / 2-e (1) where: MAX_SSI is the maximum slot cycle index;
L is the least significant 16 bits of the ESN;
H is the most significant 16 bits of the ESN;
D is a number 6 times the least significant 12 bits of the ESN;
N is system time; X represents the largest integer less than or equal to X; θ represents a bitwise exclusive-OR operation; and all other operations are integer arithmetic.
Equation 1 may be solved for PGSLOT, which represents the time at which the assigned slot occurs as measured from the beginning of the slot cycle of maximum length. Equation 2, below, relates this time to system time. Receiver 12 uses ESN 16 to calculate its PGSLOT and receiver 14 uses ESN 18. Note that PGSLOT has a maximum value of 5 x 2SSI_MAX sιots (2SSI_MAX seconds). However, receivers 12 and 14 may choose shorter slot cycles, as exemplified by Fig. 1 where both slot cycle 24 and 26 are 10 slots (2 seconds) in length.
Assigned slots 40 and 42 occur periodically within slot cycles 24 and 26, respectively. Equation 2 below may be used to determine when assigned slots 40 and 42 occur relative to system time.
(N - PGSLOT) mod (5 x 2SSI) = 0 (2)
In Equation 2, N is the current slot. As discussed above, the first slot of all possible slot cycles occurs at the beginning of system time, i.e., when N equals zero. Receivers 12 and 14 each substitute -slot cycle indices 20 and 22 respectively for SSI in Equation 2. The value of PGSLOT is also unique to each receiver 12 and 14 because it is derived from ESN 16 and 18, respectively. Receivers 12 and 14 each may compute Equation 2 once each slot cycle and, if true, monitor the channel for incoming messages because the current slot is its assigned slot 40 or 42, respectively. Of course, receivers 12 and 14 need not compute Equation 2 each slot cycle. Receivers 12 and 14 may compute Equation 2 at some initial point in time and, upon Equation 2 being true, may thereafter monitor the channel periodically at intervals of slot cycle 24 and slot cycle 26. The computations discussed above in reference to mobile station receivers 12 and 14 are also performed by base station transmitter 10. For example, when a caller dials a telephone number associated with a mobile station, the MTSO routes the call to a base station in the vicinity of the mobile station. The base station retrieves the ESN and slot cycle of the mobile station by providing a lookup table with the telephone number. The base station computes the assigned slot in which it must transmit to the mobile station using Equations 1 and 2. When the base station slot timing generates the assigned slot, the transmitter sends a message that indicates the presence of an incoming call to the mobile station. When mobile station receiver 12, for example, selects slot cycle index 20, it transmits the value selected to the base station on another channel (not shown). The base station acknowledges the selection by transmitting an acknowledgment message to mobile station receiver 12. Transmitter 10 begins using the newly selected slot cycle index after transmitting the acknowledgment. However, if receiver 12 does not receive such an acknowledgment because of a transmission error, receiver 12 will continue to use the old slot cycle index. Messages may be lost if transmitter 10 does not compute the assigned slot of receiver 12 using the same slot cycle index that receiver 12 uses to compute its assigned slot. To facilitate recovery from such an error, receiver 12 selects a default slot cycle index of "1" if it does not receive an acknowledgment. A slot cycle index of "1" ensures that an assigned slot as computed by transmitter 10 will coincide with an assigned slot as computed by receiver 12. Actually all that is required is that the receiver uses a slot cycle index less than or equal to that of the transmitter for the slots to line up.
Slot timing 28 of base station transmitter 10 is synchronized to slot timing 32 during transmission of messages to mobile station receiver 12 and to slot timing 36 during transmission of messages to mobile station receiver 14. Transmitter 10 synchronizes slot timing 28 to its system time counter (not shown).
The timing relationship between a base station transmitter and a mobile station receiver is shown in Figs. 2a-2d. Figs. 2a-2d represent successive "snapshots" in time and show a portion of the transmitter and receiver signals at these successive points in time. Note that the arrow 72 is simply a fixed point in time that serves as a common reference point for facilitating comparison of the signals throughout Figs. 2a-2d. The signals can be thought of as moving in time from left to right towards arrow 72, as though on conveyor belts. In Fig. 2a, a base station transmitter, such as base station transmitter
10 of Fig. 1, transmits a pilot signal 50, synchronized to the system clock, on a separate pilot channel. Base station transmitter 10 synchronizes transmitter slot signal 52, which has slots 54, 56, and 58, to pilot signal 50. Although pilot signal 50 is shown as having the same period as slots 54, 56, and 58, it may be any type of signal from which such a periodic signal could be derived. Slot 54 has messages 60, 62, 64, and 66. Although at least one message must be transmitted in each assigned slot, the maximum number of messages that may be transmitted in a slot is limited only by the transmission rate and slot length. Fig. 2a shows the signals at a point in time during which the receiver is in the inactive state. Receiver slot signal 68 is shown in broken lines to represent the inactive state because in the inactive state the receiver may conserve power by removing power from circuitry (not shown) that monitors the channel for messages. It may also remove power from circuitry (not shown) that tracks pilot signal 50. It is emphasized that the receiver may perform any action in the inactive state that does not require coordination with the transmitter.
As shown in Fig. 2a, receiver slot signal 68 may not be precisely aligned with transmitter slot signal 52 because in the inactive state the receiver is not tracking pilot signal 50 to which it could otherwise synchronize slot signal 68. However, the maximum time by which these signals may drift apart is substantially less than one slot.
Slot 70 is the assigned slot of the receiver and may correspond to assigned slot 40 or 42 of Fig. 1. The transmitter will send a message at the point in time when the first message, message 66, reaches arrow 72. The transmitter timing may determine this point by counting slots of the slot cycles from the beginning of system time. For example, slot zero occurred for the first time at the beginning of system time and repeats with a periodicity of the slot cycle. Although the receiver timing may have drifted slightly from the transmitter timing during the preceding inactive state, they are synchronized long before the occurrence of the next slot. Typically the drift is only about 2 microseconds for a receiver using a slot cycle of 2 seconds. Therefore, the receiver can determine the point in time at which it may expect to receive a message, i.e., arrow 72, with a precision well within a single slot. It can thus begin to transition to the active state shortly before this occurrence.
Fig. 2b shows the same signals at a point in time later than that of Fig. 2a. At a point in time between that of Fig. 2a and that of Fig. 2b, the receiver began the transition to the active state and applied power to the circuitry that tracks pilot signal 50. It is preferred that the transition begin after the beginning of slot 74, the slot preceding assigned slot 70, has reached arrow 72. However, the transition may begin at an earlier time. During the transition state, the receiver may apply power to circuitry, perform hardware resets, perform initialization routines, reacquire pilot signal 50, synchronize signals, or perform any action necessary to prepare it to receive messages in assigned slot 70 at arrow 72.
The transition state 80 is shown in Fig. 4 beginning in slot4, the slot preceding the assigned slot, slots- The receiver is in the inactive state 81 before this time. During slots, the receiver in is the active state 82, and returns to inactive state 84 at the end of slots- In the absence of conditions discussed below, a receiver is in the active state only during its assigned slot. Returning to Fig. 2c, which shows the signals at a point in time later than that of Fig. 2b, receiver slot signal 68 is completely synchronized to transmitter slot signal 52. The receiver has reacquired and is tracking pilot signal 50. The receiver is in the active state because it is prepared to receive a message in assigned slot 70 at arrow 72.
At the point in time represented by Fig. 2d, the receiver is receiving message 60. It has already received messages 62, 64, and 66. Each message may have several fields, for example, fields 90, 92, 94, and 96 of message 62. The fields contain the address of the receiver and instructions for the receiver. The field may contain system parameters for use by the receiver. Alternatively, the message field may contain the phone number when the transmitter is "paging" the receiver. The receiver decodes each message and may perform one or more actions according to the values contained in the fields.
Figure 3 shows a block diagram of a system for generating the signals described in Figs. 2a-2d. The system comprises base station transmitter 120 and mobile station receiver 122. A user (not shown) may, for example, initiate a call to the mobile station having receiver 122. In a cellular telephone system, such a call is received at the MTSO (not shown) and includes the telephone number of the mobile station being called. The MTSO routes the call to a base station. The MTSO obtains the mobile station ESN and slot cycle in response to the telephone number of the mobile station. The MTSO then provides the base station with input information 124, which includes the ESN and slot cycle of the mobile station. Information 124 is received by the transmitter processor 126, which may be a microprocessor or other control circuitry. Processor 126 may use the hash function of Equations 1-2 above to obtain the assigned slot of the mobile station.
Transmitter slot signal generator 130 generates an assigned slot signal 129, which may interrupt processor 126 when processor 126 must provide messages 128, i.e., a short time before the assigned slot. Transmitter slot signal generator 130 may have a counter for maintaining a slot count. Alternatively, the count may be maintained by processor 126. Transmitter slot signal generator 130 synchronizes messages 128 to the system clock 138, which is generated by transmitter clock source 140. Pilot signal generator 136 generates pilot signal 134, which is also synchronized to system clock 138. Summer 142 adds pilot signal 134 to synchronized message signal 132 and provides the sum signal 144 to a paging channel transmitter 141. Paging channel transmitter 141 broadcasts the transmitted messages 143. In the mobile station receiver 122, paging channel receiver 146 receives transmitted messages 143. In the inactive mode, the power controller 147 may remove power from one or more components, such as receiver 146. Received message signal 150 is provided to receiver slot signal generator 152. In the inactive mode, receiver slot signal generator 152 maintains the slot count in synchronization with local clock signal 156, which is generated by receiver clock source 158. In the active mode, receiver slot signal generator 152 extracts the messages and pilot signal from received message signal 150 and provides synchronized messages 160 in synchronization with the pilot signal. Synchronized messages 160 are provided to processor 162. Processor 162 provides output signals 164 in response to the messages. Signals 164 alert the mobile station to the type of action it must perform. For example, the mobile station may activate a "traffic" channel for conducting subsequent voice communication in response to signals 164 that alert it to the presence of an incoming call. Each message may have a MORE_PAGES field, which indicates to the receiver whether an additional message will be transmitted following the current message. A zero in this field indicates that there are no additional messages. If the receiver decodes a zero in the MORE PAGES field, it may then immediately enter the inactive state without waiting until the end of the current slot. If the message has a nonzero value in the MORE_PAGES field, the receiver remains in the active state. If a message having a nonzero value in the MORE_PAGES field is received at the end of the assigned slot, the receiver may remain in the active state into the slot following the assigned slot. It is preferred that the receiver remain in the active state no longer than two slots so that the receiver does not waste power by' being active. This is in case the message containing a MORE_PAGES field equal to "0" was received in error and discarded.
In Fig. 2d, message 66 has a nonzero value of "1" in MORE_PAGES field 98. Therefore, the receiver remains in the active state to receive message 64, which has a nonzero value of "1" in MORE_PAGES field 100. The receiver remains in the active state to receive message 62, which has a nonzero value in MORE_PAGES field 96. Similarly, the receiver remains active to receive message 60, which occurs at the end of the assigned slot 70. The receiver remains in the active state after slot 99 reaches arrow 72 because MORE_PAGES field 101 of message 60 has a nonzero value of "1." The receiver receives message 102 at the beginning of slot 99. The receiver may enter the inactive state after receiving message 102 because MORE_PAGES field 104 of message 102 has a value of "0." Messages may include an address field having the ESN of the receiver and one or more action fields instructing the receiver to perform other actions. The receiver performs any actions that occur in messages having the receiver's ESN. Alternatively, the addressing function may be performed by the transmitter sending the phone number. In this case, the receiver performs any actions that occur in messages having a phone number assigned to the receiver. These actions may direct the receiver to remain active to receive additional messages. Since the receiver now receives all slots, these messages can be sent at any time. The actions may direct a receiver to become active for a while and then enter the slotted mode of operation. In Fig. 5a, the receiver (not shown) receives a message 110 during assigned slot 112 of slot cycle "n." Message 110 has an address field 120, which contains an address 122. Message 110 also has an action field 124, which contains an instruction 126. If address 122 corresponds to the ESN of the receiver, the receiver performs instruction 126. Instruction 126 may direct the mobile station to update system parameters or "overhead" information. A message directing the mobile station to update the overhead information may also have one or more fields containing "sequence numbers." The receiver reads the sequence number contained in each such field and stores the value. When the next message containing such a sequence number is received during the next slot cycle, the receiver reads the sequence number in each sequence number field and compares them to the corresponding sequence numbers that were previously stored, usually during the previous slot cycle. If any of the sequence numbers have changed, the receiver provides an indication to the processor in the mobile station with which it is associated to update the overhead information.
In Fig. 5a, the message has sequence number field 114, which contains a sequence number 128. The receiver stores sequence number 128 in a location corresponding to the sequence number field 114. Fig. 5b represents the next slot cycle, slot cycle "n+1." The receiver receives a message 116 during assigned slot 112, which contains sequence number 130 in sequence number field 118. Sequence number field 118 corresponds to sequence number field 114 of message 110 received during the previous slot cycle. The receiver compares sequence numbers 128 and 130 and, if different, provides an indication to the processor (not shown) that the mobile station is to remain in the active state. The receiver may then wait for additional messages having the new overhead information or perform any other action as directed by the processor. The receiver need not perform any additional action if the values in corresponding sequence number fields of messages received in successive slot cycles remain unchanged.
Obviously, other embodiments and modifications of the present invention will occur readily to those of ordinary skill in the art in view of these teachings. Therefore, this invention is to be limited only by the following claims, which include all such other embodiments and modifications when viewed in conjunction with the above specification and accompanying drawings.
WE CLAIM:

Claims

1. An apparatus for communicating at periodic intervals, comprising: a base station, comprising: a message generator for providing message information; a transmitter message timing generator for generating a stream of periodic slots, least one said slot being an assigned slot; a message transmitter for transmitting said message information on a message channel only during each said assigned slot; at least one remote station, each disposed at a location remote from said base station and corresponding to one said assigned slot, each said remote station comprising: a receiver message timing generator for providing an indication of said assigned slot corresponding to said remote station; and a message receiver for monitoring said message channel only during said assigned slot corresponding to said remote station; and a message extractor for recovering said message information from said assigned slot.
2. The apparatus for communicating at periodic intervals as described in Claim 1, further comprising: a power controller disposed in each remote station for supplying power to one or more components of said remote station only during said assigned slot corresponding to said remote station.
3. The apparatus for communicating at periodic intervals as described in Claim 2, wherein said power controller supplies power to said components during a transition period immediately preceding said assigned slot corresponding to said remote station.
4. The apparatus for communicating at periodic intervals as described in Claim 3, wherein: said base station further comprising a pilot generator for providing a periodic pilot signal in synchronization with said message information and transmitting said pilot signal on a pilot channel; and each said remote station further comprising a pilot channel receiver for acquiring said pilot signal and synchronizing said receiver message timing generator to said acquired pilot signal during said transition period.
5. The apparatus for communicating at periodic intervals as described in Claim 4, wherein said transition period is a portion of said slot immediately preceding said assigned slot corresponding to said remote station.
6. The apparatus for communicating at periodic intervals as described in Claim 5, wherein said base station is a cell-site and each said remote station is a cellular telephone.
7. A method for providing periodically coordinated communication in a system having a transmitter and at least one receiver at a remote location from said transmitter, each said receiver having an active mode, an inactive mode, and a unique identification number, said transmitter and each said receiver in synchronization with periodic slots, comprising the steps of: selecting a slot cycle corresponding to each said receiver, said slot cycle being a predetermined number of said slots; selecting an assigned slot of said slot cycle of each said receiver; and transmitting on a channel at least one message once per slot cycle during said assigned slot of said receiver and simultaneously monitoring said channel during said assigned slot at said remote location.
8. The method described in Claim 7, further comprising the steps of: said message having a first field for providing an indication of additional messages; reading said state of said first field; and transmitting on said channel at least one additional message to said receiver and simultaneously monitoring said channel at said remote location when said first field indicates additional messages and placing said receiver in said inactive mode when said first field does not indicate additional messages.
9. The method described in Claim 8, wherein said inactive mode is a low-power mode.
10. The method described in Claim 7, further comprising, before 2 said step of transmitting on a channel at least one message to each said receiver once per slot cycle during said assigned slot of said receiver and 4 simultaneously monitoring said channel during said assigned slot at said remote location, the steps of: 6 acquiring a pilot signal at said remote location, said pilot signal provided by said transmitter and synchronized to said periodic slots of said 8 transmitter; and synchronizing said periodic slots of said receiver to said acquired pilot 10 signal.
11. The method described in Claim 10, wherein said inactive mode 2 is a low power consumption mode.
12. The method described in Claim 7, further comprising the steps 2 of: said message having a second field for containing an address 4 corresponding to one said identification number and a third field for containing an instruction for directing said receiver to perform an action; 6 reading said address from said second field at said remote location; reading said instruction from said third field at said remote location; 8 performing said action at said remote location if said address corresponds to said receiver at said remote location, said receiver remaining 10 in said active mode; and placing said receiver in said inactive mode.
13. The method described in Claim 12, wherein said action 2 comprises updating overhead information.
14. The method described in Claim 7, further comprising the steps ' 2 of: said message having a fourth field for containing a sequence number; 4 reading said sequence number from said fourth field at said remote location; 6 comparing said sequence number to a previously-stored sequence number; 8 performing an action at said remote location when said sequence number is not equal to said previously-stored sequence number, said 10 receiver remaining in said active mode; storing said sequence number at said remote location; and placing said receiver in said inactive mode.
15. The method described in Claim 14, wherein said action comprises updating overhead information.
16. The method described in Claim 7, wherein said assigned slot is selected in response to said identification number.
17. The method described in Claim 16, wherein: said slot cycle beginning at a predetermined time; and said assigned slot is selected in response to said predetermined time.
18. The method described in Claim 17, wherein said step of selecting a slot cycle is performed at said remote location.
19. The method described in Claim 18, wherein said step of selecting a slot cycle comprises the steps of: selecting a slot cycle index (SSI) in the range of between 1 and 7; and computing a slot cycle having 5 x 2$SI slots.
20. The method described in Claim 19, wherein each said slot is 200 milliseconds.
21. The method described in Claim 19, wherein: N being the number of slots elapsed since said predetermined time; said identification number having 32 bits, L being the least significant 16 bits of said identification number, H being the most significant 16 bits of said identification number, and D being a number 6 times the least significant 12 bits of said identification number;
PGSLOT being the largest integer less than or equal to: 27 x ((40503 x (L Θ H Θ D)) mod 2-6) / 2-6; and said assigned slot occurring when (N - PGSLOT) mod (5 x 2SSI) = 0.
PCT/US1993/001981 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communications receiver WO1993018596A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
EP93907228A EP0629324B1 (en) 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communications receiver
AU37906/93A AU678151B2 (en) 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communications receiver
AT93907228T ATE277464T1 (en) 1992-03-05 1993-03-04 DEVICE AND METHOD FOR REDUCING POWER CONSUMPTION IN A MOBILE COMMUNICATIONS RECEIVER
BR9306033A BR9306033A (en) 1992-03-05 1993-03-04 Device for communicating at periodic intervals and process to provide periodic coordinated communication
JP51589893A JP3193380B2 (en) 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communication receiver
KR1019940703124A KR0179402B1 (en) 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communications receiver
DK93907228T DK0629324T3 (en) 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communication receiver
DE69333633T DE69333633T2 (en) 1992-03-05 1993-03-04 DEVICE AND METHOD FOR REDUCING PERFORMANCE CONSUMPTION IN A MOBILE COMMUNICATIONS RECEIVER
SK1053-94A SK282130B6 (en) 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communications receiver
BG99025A BG61745B1 (en) 1992-03-05 1994-09-01 Method for reducing the power consumption in a mobile communication receiver and a system for the realization of the method
FI944057A FI115368B (en) 1992-03-05 1994-09-02 Device and method for reducing the power consumption of a data communication receiver
HK98116167A HK1015209A1 (en) 1992-03-05 1998-12-28 Apparatus and method for reducing power consumption in a mobile communications receiver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US847,149 1992-03-05
US07/847,149 US5392287A (en) 1992-03-05 1992-03-05 Apparatus and method for reducing power consumption in a mobile communications receiver

Publications (1)

Publication Number Publication Date
WO1993018596A1 true WO1993018596A1 (en) 1993-09-16

Family

ID=25299893

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/001981 WO1993018596A1 (en) 1992-03-05 1993-03-04 Apparatus and method for reducing power consumption in a mobile communications receiver

Country Status (21)

Country Link
US (2) US5392287A (en)
EP (1) EP0629324B1 (en)
JP (1) JP3193380B2 (en)
KR (1) KR0179402B1 (en)
CN (1) CN1052593C (en)
AT (1) ATE277464T1 (en)
AU (2) AU678151B2 (en)
BG (1) BG61745B1 (en)
BR (1) BR9306033A (en)
CA (1) CA2130663C (en)
DE (1) DE69333633T2 (en)
DK (1) DK0629324T3 (en)
FI (1) FI115368B (en)
HK (1) HK1015209A1 (en)
HU (1) HU218335B (en)
IL (1) IL104911A (en)
MX (1) MX9301231A (en)
RU (1) RU2114511C1 (en)
SK (1) SK282130B6 (en)
WO (1) WO1993018596A1 (en)
ZA (1) ZA931406B (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5491718A (en) * 1994-01-05 1996-02-13 Nokia Mobile Phones Ltd. CDMA radiotelephone having optimized slotted mode and long code operation
WO1996010895A1 (en) * 1994-09-30 1996-04-11 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
WO1997021282A2 (en) * 1995-12-07 1997-06-12 Vistar Telecommunications Inc. Wireless packet data distributed communications system
FR2743249A1 (en) * 1995-12-29 1997-07-04 Motorola Inc APPARATUS AND METHOD FOR SCANNING TRACKS
US5654978A (en) * 1993-11-01 1997-08-05 Omnipoint Corporation Pulse position modulation with spread spectrum
US5666379A (en) * 1993-11-01 1997-09-09 Omnipoint Corporation Best-of-M pulse position modulation detector
WO1998023118A1 (en) * 1996-11-15 1998-05-28 Nokia Telecommunications Oy Dynamic channel allocation
US5832022A (en) * 1995-06-02 1998-11-03 Omnipoint Corporation Method and apparatus for controlling the modulation index of continuous phase modulated (CPM) signals
US5991279A (en) * 1995-12-07 1999-11-23 Vistar Telecommunications Inc. Wireless packet data distributed communications system
US6111865A (en) * 1997-05-30 2000-08-29 Qualcomm Incorporated Dual channel slotted paging
EP1192746A1 (en) * 1999-07-10 2002-04-03 Samsung Electronics Co., Ltd. Apparatus and method for releasing reverse common channel in cdma communication system
US6564074B2 (en) 1997-10-03 2003-05-13 Hewlett-Packard Company Power management method of and apparatus for use in a wireless local area network (LAN)
US6832094B2 (en) 1997-05-30 2004-12-14 Qualcomm, Incorporated Dual event slotted paging
US7035627B1 (en) 1994-09-30 2006-04-25 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
US7085254B1 (en) 1999-05-29 2006-08-01 Samsung Electronics Co., Ltd. Apparatus and method for gated transmission in CDMA communication system
US7483699B2 (en) * 1998-09-22 2009-01-27 Qualcomm Incorporated Overhead message update with decentralized control
CN1849010B (en) * 2006-03-10 2010-04-14 华为技术有限公司 Terminal addressing method for receiving multimedia broadcasting multi-broadcasting service
EP1696670A3 (en) * 1997-07-11 2010-12-01 France Telecom Data signal for modifying a graphic scene, corresponding method and device
US8050724B2 (en) 1999-12-29 2011-11-01 Samsung Electronics Co., Ltd Method for controlling power in wireless telephone set
US8315659B2 (en) 1997-08-15 2012-11-20 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
WO2014150945A3 (en) * 2013-03-15 2014-11-13 Qualcomm Incorporated Method and apparatus for avoiding network resynchronization in stationary m2m devices

Families Citing this family (248)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5796772A (en) 1991-05-13 1998-08-18 Omnipoint Corporation Multi-band, multi-mode spread-spectrum communication system
US5887020A (en) 1991-05-13 1999-03-23 Omnipoint Corporation Multi-band, multi-mode spread-spectrum communication system
US7558557B1 (en) * 1991-11-12 2009-07-07 Broadcom Corporation Low-power messaging in a network supporting roaming terminals
US5694414A (en) 1991-05-13 1997-12-02 Omnipoint Corporation Multi-band, multi-mode spread-spectrum communication system
US5815525A (en) 1991-05-13 1998-09-29 Omnipoint Corporation Multi-band, multi-mode spread-spectrum communication system
US5790587A (en) 1991-05-13 1998-08-04 Omnipoint Corporation Multi-band, multi-mode spread-spectrum communication system
US6374311B1 (en) * 1991-10-01 2002-04-16 Intermec Ip Corp. Communication network having a plurality of bridging nodes which transmit a beacon to terminal nodes in power saving state that it has messages awaiting delivery
US7415548B2 (en) 1991-05-13 2008-08-19 Broadcom Corporation Communication network having a plurality of bridging nodes which transmits a polling message with backward learning technique to determine communication pathway
US5285469A (en) 1991-06-03 1994-02-08 Omnipoint Data Corporation Spread spectrum wireless telephone system
DE69232639T2 (en) * 1991-10-01 2003-02-20 Norand Corp LOCAL RADIO FREQUENCY NETWORK
US5546445A (en) * 1991-12-26 1996-08-13 Dennison; Everett Cellular telephone system that uses position of a mobile unit to make call management decisions
US5235633A (en) * 1991-12-26 1993-08-10 Everett Dennison Cellular telephone system that uses position of a mobile unit to make call management decisions
US6324404B1 (en) * 1991-12-26 2001-11-27 Sycord Limited Partnership Cellular telephone system that uses position of a mobile unit to make call management decisions
TW214620B (en) * 1992-04-13 1993-10-11 Ericsson Ge Mobile Communicat Calling channel in CDMA communications system
FR2694853A1 (en) * 1992-08-14 1994-02-18 Trt Telecom Radio Electr An information transmission system comprising at least one base station and one satellite station and station forming part of such a system.
FI94994C (en) * 1992-10-19 1995-11-27 Nokia Telecommunications Oy Distributed access method in a radio system
DE9214886U1 (en) * 1992-11-02 1994-03-03 Siemens Ag Arrangement for controlling a transceiver, in particular base stations and mobile parts of a cordless telephone system
US7917145B2 (en) * 1992-11-02 2011-03-29 Broadcom Corporation Radio frequency local area network
JP3108567B2 (en) * 1993-08-27 2000-11-13 株式会社エヌ・ティ・ティ・ドコモ Mobile radio system and mobile receiver
US8509260B2 (en) * 1993-08-31 2013-08-13 Broadcom Corporation Modular, portable data processing terminal for use in a communication network
FR2709907B1 (en) * 1993-09-09 1995-12-08 Info Telecom Method for increasing the autonomy of an information receiver, in particular paging, and corresponding receiver.
US6005856A (en) 1993-11-01 1999-12-21 Omnipoint Corporation Communication protocol for spread spectrum wireless communication system
WO1995012945A1 (en) * 1993-11-01 1995-05-11 Omnipoint Corporation Despreading/demodulating direct sequence spread spectrum signals
US6094575A (en) 1993-11-01 2000-07-25 Omnipoint Corporation Communication system and method
US6088590A (en) 1993-11-01 2000-07-11 Omnipoint Corporation Method and system for mobile controlled handoff and link maintenance in spread spectrum communication
NZ281061A (en) * 1994-02-24 1997-12-19 Gte Mobile Comm Servinc Cellular wireless telephone system equipped with remote program mobile station
FI941221A (en) * 1994-03-15 1995-09-16 Nokia Mobile Phones Ltd A method for reducing the power consumption of a radio telephone by a mobile telephone system and a radio telephone
EP1796274B1 (en) * 1994-07-21 2010-10-06 Interdigital Technology Corporation Power consumption control method for a TDMA radio subscriber unit
US6775531B1 (en) * 1994-07-21 2004-08-10 Interdigital Technology Corporation Subscriber terminal temperature regulation
US6243399B1 (en) 1994-07-21 2001-06-05 Interdigital Technology Corporation Ring signal generator
US5856998A (en) 1994-09-09 1999-01-05 Omnipoint Corporation Method and apparatus for correlating a continuous phase modulated spread spectrum signal
US5680414A (en) 1994-09-09 1997-10-21 Omnipoint Corporation Synchronization apparatus and method for spread spectrum receiver
US5881100A (en) 1994-09-09 1999-03-09 Omnipoint Corporation Method and apparatus for coherent correlation of a spread spectrum signal
US5648982A (en) 1994-09-09 1997-07-15 Omnipoint Corporation Spread spectrum transmitter
US5659574A (en) 1994-09-09 1997-08-19 Omnipoint Corporation Multi-bit correlation of continuous phase modulated signals
US5629956A (en) 1994-09-09 1997-05-13 Omnipoint Corporation Method and apparatus for reception and noncoherent serial correlation of a continuous phase modulated signal
US5692007A (en) 1994-09-09 1997-11-25 Omnipoint Corporation Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuous-phase modulation
US5963586A (en) 1994-09-09 1999-10-05 Omnipoint Corporation Method and apparatus for parallel noncoherent correlation of a spread spectrum signal
US5757847A (en) 1994-09-09 1998-05-26 Omnipoint Corporation Method and apparatus for decoding a phase encoded signal
US5832028A (en) 1994-09-09 1998-11-03 Omnipoint Corporation Method and apparatus for coherent serial correlation of a spread spectrum signal
US5754585A (en) 1994-09-09 1998-05-19 Omnipoint Corporation Method and apparatus for serial noncoherent correlation of a spread spectrum signal
US5627856A (en) 1994-09-09 1997-05-06 Omnipoint Corporation Method and apparatus for receiving and despreading a continuous phase-modulated spread spectrum signal using self-synchronizing correlators
US5953370A (en) 1994-09-09 1999-09-14 Omnipoint Corporation Apparatus for receiving and correlating a spread spectrum signal
US5610940A (en) 1994-09-09 1997-03-11 Omnipoint Corporation Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal
US6356607B1 (en) 1995-06-05 2002-03-12 Omnipoint Corporation Preamble code structure and detection method and apparatus
US5745484A (en) * 1995-06-05 1998-04-28 Omnipoint Corporation Efficient communication system using time division multiplexing and timing adjustment control
US5959980A (en) * 1995-06-05 1999-09-28 Omnipoint Corporation Timing adjustment control for efficient time division duplex communication
US5752202A (en) * 1995-06-07 1998-05-12 Motorola, Inc. Method of message delivery adapted for a power conservation system
US6885652B1 (en) * 1995-06-30 2005-04-26 Interdigital Technology Corporation Code division multiple access (CDMA) communication system
ZA965340B (en) * 1995-06-30 1997-01-27 Interdigital Tech Corp Code division multiple access (cdma) communication system
US6816473B2 (en) 1995-06-30 2004-11-09 Interdigital Technology Corporation Method for adaptive forward power control for spread-spectrum communications
US7929498B2 (en) * 1995-06-30 2011-04-19 Interdigital Technology Corporation Adaptive forward power control and adaptive reverse power control for spread-spectrum communications
US7072380B2 (en) * 1995-06-30 2006-07-04 Interdigital Technology Corporation Apparatus for initial power control for spread-spectrum communications
USRE38523E1 (en) 1995-06-30 2004-06-01 Interdigital Technology Corporation Spreading code sequence acquisition system and method that allows fast acquisition in code division multiple access (CDMA) systems
US7123600B2 (en) * 1995-06-30 2006-10-17 Interdigital Technology Corporation Initial power control for spread-spectrum communications
US6049535A (en) * 1996-06-27 2000-04-11 Interdigital Technology Corporation Code division multiple access (CDMA) communication system
US6788662B2 (en) 1995-06-30 2004-09-07 Interdigital Technology Corporation Method for adaptive reverse power control for spread-spectrum communications
US6801516B1 (en) 1995-06-30 2004-10-05 Interdigital Technology Corporation Spread-spectrum system for assigning information signals having different data rates
US7020111B2 (en) * 1996-06-27 2006-03-28 Interdigital Technology Corporation System for using rapid acquisition spreading codes for spread-spectrum communications
US6940840B2 (en) 1995-06-30 2005-09-06 Interdigital Technology Corporation Apparatus for adaptive reverse power control for spread-spectrum communications
US6697350B2 (en) 1995-06-30 2004-02-24 Interdigital Technology Corporation Adaptive vector correlator for spread-spectrum communications
US6041046A (en) * 1995-07-14 2000-03-21 Omnipoint Corporation Cyclic time hopping in time division multiple access communication system
US6570865B2 (en) 1995-08-10 2003-05-27 Hitachi, Ltd. CDMA mobile communications system and communication method
JP3212238B2 (en) * 1995-08-10 2001-09-25 株式会社日立製作所 Mobile communication system and mobile terminal device
US5729540A (en) * 1995-10-19 1998-03-17 Qualcomm Incorporated System and method for scheduling messages on a common channel
CN1102325C (en) * 1995-12-04 2003-02-26 摩托罗拉公司 Method for dynamically changing selection of control frame of call receiving equipment in mixed system environment
US7590083B2 (en) * 1995-12-07 2009-09-15 Transcore Link Logistics Corp. Wireless packet data distributed communications system
US5710975A (en) * 1995-12-26 1998-01-20 Motorola, Inc. Selective call transceiver with system approved power saving state
EP0831612B1 (en) * 1996-03-15 2009-06-17 Ntt Mobile Communications Network Inc. Mobile communication system
US5946602A (en) * 1996-04-11 1999-08-31 Comsat Corporation Reduction of queuing delays by multiple subgroup assignments
US6175720B1 (en) 1996-04-10 2001-01-16 Comsat Corporation Paging cells & paging time plans for non-geostationary satellite system
US6205343B1 (en) * 1996-05-28 2001-03-20 Motorola, Inc. Peak current reduction in a cordless telephone handset
US6178164B1 (en) 1996-06-07 2001-01-23 Qualcomm Incorporated Method and apparatus for performing idle handoff in a multiple access communication system
US6021122A (en) * 1996-06-07 2000-02-01 Qualcomm Incorporated Method and apparatus for performing idle handoff in a multiple access communication system
US6073035A (en) * 1996-08-09 2000-06-06 Oki Telecom, Inc. System unavailablity power reduction method with early failure and no rotation
US5889768A (en) * 1996-08-30 1999-03-30 Motorola, Inc. Method of and apparatus for pilot channel acquisition
US6160799A (en) * 1996-09-06 2000-12-12 Motorola, Inc. Method of and apparatus for pilot set maintenance
CA2220900C (en) * 1996-11-14 2002-02-12 Ntt Mobile Communications Network Inc. Paging scheme for mobile communication system using increased paging channel data transmission rate
US6141373A (en) 1996-11-15 2000-10-31 Omnipoint Corporation Preamble code structure and detection method and apparatus
US5920549A (en) * 1996-12-19 1999-07-06 Motorola, Inc. Method of handing off and a wireless communication device
US5987012A (en) * 1996-12-19 1999-11-16 Motorola, Inc. Method of handing off and a wireless communication device
US6501771B2 (en) 1997-02-11 2002-12-31 At&T Wireless Services, Inc. Delay compensation
WO1998035473A2 (en) * 1997-02-06 1998-08-13 At & T Wireless Services, Inc. Remote wireless unit having reduced power operating mode
US6085114A (en) * 1997-02-06 2000-07-04 At&T Wireless Systems Inc. Remote wireless unit having reduced power operating mode
US5933421A (en) 1997-02-06 1999-08-03 At&T Wireless Services Inc. Method for frequency division duplex communications
US5987338A (en) * 1997-02-19 1999-11-16 At&T Wireless Services Remote wireless unit having reduced power operating mode
WO1998037653A2 (en) * 1997-02-19 1998-08-27 At & T Wireless Services, Inc. Remote wireless unit having reduced power operating mode for a discrete multitone spread spectrum communications system
US6584144B2 (en) * 1997-02-24 2003-06-24 At&T Wireless Services, Inc. Vertical adaptive antenna array for a discrete multitone spread spectrum communications system
US6359923B1 (en) * 1997-12-18 2002-03-19 At&T Wireless Services, Inc. Highly bandwidth efficient communications
US6408016B1 (en) * 1997-02-24 2002-06-18 At&T Wireless Services, Inc. Adaptive weight update method and system for a discrete multitone spread spectrum communications system
US5910944A (en) * 1997-02-28 1999-06-08 Motorola, Inc. Radio telephone and method for operating a radiotelephone in slotted paging mode
US6041241A (en) * 1997-03-03 2000-03-21 Motorola, Inc. Apparatus and method for balancing power savings and call set up time in a wireless communication device
US6282228B1 (en) 1997-03-20 2001-08-28 Xircom, Inc. Spread spectrum codes for use in communication
US5912920A (en) * 1997-03-27 1999-06-15 Marchok; Daniel J. Point-to multipoint digital communications system facilitating use of a reduced complexity receiver at each of the multipoint sites
US6236863B1 (en) 1997-03-31 2001-05-22 Oki Telecom, Inc. Comprehensive transmitter power control system for radio telephones
US6332086B2 (en) * 1997-04-07 2001-12-18 Graham Avis Discontinuous receive operation in a wireless terminal
US6069880A (en) * 1997-05-19 2000-05-30 Qualcomm Incorporated Method and apparatus for scanning other frequency pilot signals in a code division multiple access communication system
JP2914444B2 (en) * 1997-07-22 1999-06-28 日本電気株式会社 CDMA transceiver
KR100258221B1 (en) * 1997-07-25 2000-06-01 윤종용 Ignition method of packet traffic channel for communication system
US6044282A (en) * 1997-08-15 2000-03-28 Sharp Laboratories Of America, Inc. Dual clock power conservation system and method for timing synchronous communications
DE19737945B4 (en) * 1997-08-30 2004-05-19 Continental Aktiengesellschaft Method for the transmission of data in a data transmission system and data transmission system
US6377809B1 (en) * 1997-09-16 2002-04-23 Qualcomm Incorporated Channel structure for communication systems
US5990806A (en) * 1997-10-08 1999-11-23 Motorola Method and apparatus for efficient reverse channel utilization in a two-way messaging system
US20020051434A1 (en) * 1997-10-23 2002-05-02 Ozluturk Fatih M. Method for using rapid acquisition spreading codes for spread-spectrum communications
US5955986A (en) * 1997-11-20 1999-09-21 Eagle Eye Technologies, Inc. Low-power satellite-based geopositioning system
KR100241780B1 (en) 1997-12-16 2000-02-01 윤종용 Power saving apparatus for radio communication terminal
US6094429A (en) * 1998-03-02 2000-07-25 Motorola, Inc. Method for accessing and providing access to a packet channel
US6285873B1 (en) 1998-03-09 2001-09-04 Qualcomm Incorporated Method for generating a broadcast challenge value
US6101173A (en) * 1998-03-16 2000-08-08 Qualcomm Incorporated Adaptive reacquisition time in a slotted paging environment
US6356538B1 (en) 1998-03-30 2002-03-12 Oki Telecom, Inc. Partial sleep system for power savings in CDMA wireless telephone devices
RU2179373C2 (en) * 1998-04-25 2002-02-10 Самсунг Электроникс Ко., Лтд. Control of transmission power between base station and mobile station in mobile communication system
US6229988B1 (en) * 1998-05-20 2001-05-08 Lojack Corporation Method of and apparatus for battery and similar power source conservation in periodically operable portable and related radio receivers and the like
FI981372A (en) * 1998-06-12 1999-12-13 Nokia Networks Oy Method for transmitting time slots in a base station system
EP1784041B1 (en) * 1998-06-23 2010-04-28 Qualcomm, Incorporated Cellular communication system with common channel soft handoff and associated method
US6216004B1 (en) * 1998-06-23 2001-04-10 Qualcomm Incorporated Cellular communication system with common channel soft handoff and associated method
US6590886B1 (en) * 1998-07-17 2003-07-08 Qualcomm, Incorporated Technique for reduction of awake time in a wireless communication device utilizing slotted paging
US6278703B1 (en) * 1998-12-09 2001-08-21 Qualcomm Incorporated Method and apparatus for improving neighbor searching performance
US6236850B1 (en) 1999-01-08 2001-05-22 Trw Inc. Apparatus and method for remote convenience function control with increased effective receiver seek time and reduced power consumption
US6215999B1 (en) * 1999-03-17 2001-04-10 Motorola, Inc. Method and apparatus for identifying channels and channel frequencies used in a subzone of a wireless communication system
US6687285B1 (en) 1999-03-19 2004-02-03 Qualcomm Incorporated Method and apparatus for supervising the performance of a quick paging channel in a dual event slotted paging system
US7075903B1 (en) * 1999-04-14 2006-07-11 Adc Telecommunications, Inc. Reduced power consumption in a communication device
US7085246B1 (en) 1999-05-19 2006-08-01 Motorola, Inc. Method and apparatus for acquisition of a spread-spectrum signal
US7031271B1 (en) 1999-05-19 2006-04-18 Motorola, Inc. Method of and apparatus for activating a spread-spectrum radiotelephone
US8255149B2 (en) 1999-07-12 2012-08-28 Skybitz, Inc. System and method for dual-mode location determination
US20040143392A1 (en) * 1999-07-12 2004-07-22 Skybitz, Inc. System and method for fast acquisition reporting using communication satellite range measurement
US6560536B1 (en) 1999-07-12 2003-05-06 Eagle-Eye, Inc. System and method for rapid telepositioning
US6606490B1 (en) * 1999-08-10 2003-08-12 Intel Corporation Battery operated radio receivers having power save by reducing active reception time
KR100361223B1 (en) * 1999-08-14 2002-11-23 주식회사 모리아테크놀로지 System providing paging indicators on the pilot channels in a wireless telecommunication
AU5906499A (en) * 1999-09-01 2001-03-26 Sony Electronics Inc. Method and apparatus for decoding continuously coded convolutionally encoded messages
US6453181B1 (en) * 1999-11-04 2002-09-17 Qualcomm, Incorporated Method and apparatus for compensating for frequency drift in a low frequency sleep clock within a mobile station operating in a slotted paging mode
US6678537B1 (en) * 1999-11-23 2004-01-13 Agere Systems Inc. Adjustment of period of real-time slow drift correction of alignment of handset's local oscillator for a cordless telephone
FI109865B (en) * 1999-12-08 2002-10-15 Nokia Corp Procedure for reducing the power consumption of a wireless communication device
US7006477B1 (en) * 1999-12-10 2006-02-28 Lucent Technologies Inc. Method for interleaving of half rate channels suitable for half duplex operation and statistical multiplexing
US6505052B1 (en) * 2000-02-01 2003-01-07 Qualcomm, Incorporated System for transmitting and receiving short message service (SMS) messages
US6937578B1 (en) * 2000-02-02 2005-08-30 Denso Corporation Fast-sleep configuration for CDMA slotted mode
US6728300B1 (en) * 2000-02-11 2004-04-27 Qualcomm Incorporated Method and apparatus for maximizing standby time in remote stations configured to receive broadcast databurst messages
IL134512A0 (en) * 2000-02-13 2001-04-30 Dspc Tech Ltd Offline acquisition method for cdma
US7224719B1 (en) * 2000-03-31 2007-05-29 Qualcomm, Incorporated Fast acquisition of a pilot signal in a wireless communication device
US6539242B1 (en) 2000-03-31 2003-03-25 Qualcomm Incorporated Efficient detection of general paging messages in poor signal to noise environments
US6628675B1 (en) 2000-03-31 2003-09-30 Qualcomm Incorporated Symbol combiner synchronization after a jump to a new time alignment
US6477162B1 (en) 2000-03-31 2002-11-05 Qualcomm, Incorporated Dynamically adjusting integration interval based on a signal strength
US6330234B1 (en) * 2000-04-27 2001-12-11 Peter A. Tomasi Method and apparatus for reducing current consumption
US7194020B1 (en) * 2000-06-09 2007-03-20 Lucent Technologies Inc. Method and apparatus for dynamically adjusting acquisition search window
US7027486B2 (en) * 2000-09-18 2006-04-11 Skybitz, Inc. System and method for fast code phase and carrier frequency acquisition in GPS receiver
JP2004506219A (en) 2000-08-09 2004-02-26 スカイビッツ,インコーポレイテッド High speed code phase and carrier frequency acquisition system and method in GPS receiver
JP4846895B2 (en) * 2000-08-14 2011-12-28 クゥアルコム・インコーポレイテッド Updating overhead messages with distributed control
US6639907B2 (en) 2000-09-26 2003-10-28 Qualcomm, Incorporated Method and apparatus for processing paging indicator bits transmitted on a quick paging channel
US6999799B1 (en) 2000-09-28 2006-02-14 Texas Instruments Incorporated System and method for adaptive deep-sleep slotted operation
US6804528B1 (en) 2000-11-03 2004-10-12 Lucent Technologies, Inc. Apparatus and method for use in the multicast of traffic data in wireless multiple access communications systems
US7251232B1 (en) * 2000-11-22 2007-07-31 Cisco Technology, Inc. Point-controlled contention arbitration in multiple access wireless LANs
JP3838877B2 (en) * 2001-01-15 2006-10-25 日本電気株式会社 CDMA receiver for performing path search, path search method, and program
US7110380B2 (en) * 2001-02-07 2006-09-19 Freescale Semiconductor, Inc. System, method, and computer program product for sharing bandwidth in a wireless personal area network or a wireless local area network
US7301987B2 (en) * 2001-02-08 2007-11-27 Intel Corporation Background processing and searching for a communication channel
FR2822333B1 (en) * 2001-03-15 2003-07-04 Cit Alcatel PARAMETER CONFIGURATION PROCESS FOR TRANSMISSION BY DATA PACKETS
US20030016702A1 (en) * 2001-03-30 2003-01-23 Bender Paul E. Method and system for maximizing standby time in monitoring a control channel
US7218623B1 (en) 2001-05-04 2007-05-15 Ipr Licensing, Inc. Coded reverse link messages for closed-loop power control of forward link control messages
GB2375690A (en) * 2001-05-15 2002-11-20 Motorola Inc Radio communication device and the scheduling of its inactive mode
US7403507B2 (en) * 2001-06-18 2008-07-22 Texas Instruments Incorporated System and method for recovering system time in direct sequence spread spectrum communications
KR100396778B1 (en) * 2001-06-25 2003-09-02 엘지전자 주식회사 Power controlling method for mobile communication device
US6876635B2 (en) 2001-11-05 2005-04-05 Motorola, Inc. Current reduction by receiver linearity adjustment in a communication device
US7082107B1 (en) 2001-11-26 2006-07-25 Intel Corporation Power control in wireless communications based on estimations of packet error rate
US7047005B2 (en) * 2001-12-18 2006-05-16 Motorola, Inc. Method and mobile station for enabling a preferred slot cycle
US7269145B2 (en) * 2001-12-20 2007-09-11 Samsung Electronics Co., Ltd. Mode transition method for wireless data service in a mobile station
US6980823B2 (en) * 2002-01-31 2005-12-27 Qualcomm Inc. Intermediate wake mode to track sleep clock frequency in a wireless communication device
JP4158703B2 (en) 2002-03-04 2008-10-01 ソニー株式会社 Wireless communication system, wireless communication apparatus, wireless communication method, and computer program
US6950684B2 (en) 2002-05-01 2005-09-27 Interdigital Technology Corporation Method and system for optimizing power resources in wireless devices
EP1502372A4 (en) 2002-05-06 2010-09-08 Interdigital Tech Corp Synchronization for extending battery life
DE10222970A1 (en) * 2002-05-23 2004-02-05 Philips Intellectual Property & Standards Gmbh Method for network connection of a UMTS mobile radio device
GB2390263B (en) 2002-06-24 2004-05-12 Technologies Inc Lucent A method of selecting length of time of inactivity on a channel dedictated to a user terminal to be detected for the channel to be released,
US6973310B2 (en) * 2002-06-26 2005-12-06 Qualcomm Inc. Fast reacquisition after long sleep
US7796631B2 (en) 2002-07-09 2010-09-14 Qualcomm Incorporated Method and system for a multicast service initiation in a communication system
US6876636B2 (en) 2002-07-09 2005-04-05 Qualcomm Inc. Method and system for a multicast service initiation in a communication system
US7099679B2 (en) * 2002-07-18 2006-08-29 Intel Corporation Method of saving power by reducing active reception time in standby mode
TW556421B (en) * 2002-08-15 2003-10-01 Htc Corp Circuit and operating method for integrated interface of PDA and wireless communication system
US7519032B2 (en) * 2002-09-04 2009-04-14 Koninklijke Philips Electronics N.V. Apparatus and method for providing QoS service schedule and bandwidth allocation to a wireless station
KR100935784B1 (en) * 2002-10-15 2010-01-06 엘지전자 주식회사 Method of allotting base station frame offset using hashing
KR100837062B1 (en) * 2002-12-11 2008-06-11 엘지전자 주식회사 Method for Increasing Sleep Time of Mobile Communication Terminal
US20040176147A1 (en) * 2003-03-06 2004-09-09 Wilberth Escalante Power conservation in a mobile communication device utilizing variable reacquisition time in a discontinuous reception regime
US7356561B2 (en) * 2003-05-01 2008-04-08 Lucent Technologies Inc. Adaptive sleeping and awakening protocol for an energy-efficient adhoc network
CN100391124C (en) * 2003-12-30 2008-05-28 上海微小卫星工程中心 A non-static orbiting satellite communication access method
ATE486480T1 (en) * 2004-02-06 2010-11-15 Koninkl Philips Electronics Nv SYSTEM AND METHOD FOR A HIBERNATION MODE FOR BARK FACILITIES
BRPI0508406A8 (en) * 2004-03-04 2018-04-03 Samsung Electronics Co Ltd SYSTEM AND METHOD FOR CONTROLLING THE OPERATING MODE OF A MAC LAYER IN A BROADBAND WIRELESS ACCESS COMMUNICATION SYSTEM
US9020854B2 (en) 2004-03-08 2015-04-28 Proxense, Llc Linked account system using personal digital key (PDK-LAS)
US20050239449A1 (en) * 2004-04-22 2005-10-27 Don Timms Mobile communications network slot cycle
US7129753B2 (en) * 2004-05-26 2006-10-31 Infineon Technologies Ag Chip to chip interface
US7522685B2 (en) * 2004-06-01 2009-04-21 Honeywell International Inc. Resynchronizing timing sync pulses in a synchronizing RF system
US20060080263A1 (en) * 2004-10-13 2006-04-13 Willis John A Identity theft protection and notification system
EP1792510A1 (en) * 2004-09-20 2007-06-06 Nokia Corporation Method and system for controlling change of an access point in a communication system
JP2006173691A (en) * 2004-12-13 2006-06-29 Hitachi Ltd Radio communication system
AU2005319019A1 (en) 2004-12-20 2006-06-29 Proxense, Llc Biometric personal data key (PDK) authentication
US8073470B1 (en) 2005-01-31 2011-12-06 Jasper Wireless, Inc Paging windows for power conservation in wireless networks
US8073469B2 (en) 2005-01-31 2011-12-06 Jasper Wireless, Inc. Paging for non-real-time communications wireless networks
US20060248197A1 (en) * 2005-04-27 2006-11-02 Evans Scott C Adaptive connectionless scheduling protocol
JP4618791B2 (en) * 2005-05-13 2011-01-26 ホーチキ株式会社 Notification broadcasting system
JP5025915B2 (en) * 2005-05-31 2012-09-12 京セラ株式会社 Communication device, communication device control method, base station, base station content broadcast method, and base station page message transmission method
US7590403B1 (en) * 2005-06-07 2009-09-15 Good Technology, Inc. Wireless device dormancy override
US8385878B2 (en) * 2005-06-28 2013-02-26 Qualcomm Incorporated Systems, methods, and apparatus for activity control in a wireless communications device
US7509150B1 (en) 2005-08-02 2009-03-24 Itt Manufacturing Enterprises, Inc. Reducing power consumption in a radio device by early receiver shut down
US7852801B2 (en) * 2005-09-28 2010-12-14 Qualcomm Incorporated Reducing collision probability for VoIP packets
US7720465B2 (en) * 2005-09-30 2010-05-18 Robert Bosch Gmbh System, method and apparatus employing tones and/or tone patterns to indicate the message type in wireless sensor networks
US8010091B2 (en) * 2005-09-30 2011-08-30 Abtin Keshavarzian System, method and apparatus employing tone and/or tone patterns to indicate the message type in wireless sensor networks
US8433919B2 (en) 2005-11-30 2013-04-30 Proxense, Llc Two-level authentication for secure transactions
US8219129B2 (en) * 2006-01-06 2012-07-10 Proxense, Llc Dynamic real-time tiered client access
US11206664B2 (en) 2006-01-06 2021-12-21 Proxense, Llc Wireless network synchronization of cells and client devices on a network
WO2007136435A2 (en) * 2006-02-06 2007-11-29 Olympus Communication Technology Of America, Inc. Power management
JP4332805B2 (en) * 2006-03-17 2009-09-16 ソニー株式会社 COMMUNICATION SYSTEM, TRANSMISSION DEVICE AND METHOD, AND RECEPTION DEVICE AND METHOD
US8920343B2 (en) 2006-03-23 2014-12-30 Michael Edward Sabatino Apparatus for acquiring and processing of physiological auditory signals
US7684799B2 (en) * 2006-03-28 2010-03-23 Motorola, Inc. Method for data transfer with a mobile station while in discontinuous reception state
US20070262853A1 (en) * 2006-05-05 2007-11-15 Black & Decker Inc. Vehicle alarm
CA2657573C (en) * 2006-07-14 2015-01-27 Multitone Electronics Plc Telecommunications system and method
GB2449278B (en) * 2007-05-16 2009-10-07 Multitone Electronics Plc Telecommunications system and method
JP4374005B2 (en) * 2006-08-31 2009-12-02 Okiセミコンダクタ株式会社 Wake-up control device and method
CA2662968C (en) * 2006-09-11 2013-07-09 Research In Motion Limited Apparatus, and associated method, for paging an access terminal in a radio communication system
JP2008103897A (en) * 2006-10-18 2008-05-01 Fuji Electric Systems Co Ltd Wireless transmitter, wireless receiver, wireless communication method and wireless communication program
US9269221B2 (en) 2006-11-13 2016-02-23 John J. Gobbi Configuration of interfaces for a location detection system and application
US7813296B2 (en) * 2006-12-27 2010-10-12 Telefonaktiebolaget L M Ericsson (Publ) Adapting transmission and reception time in packet based cellular systems
US20080194224A1 (en) * 2007-02-12 2008-08-14 Motorola, Inc. Emergency broadcast message support in wireless communication networks
US7729321B2 (en) * 2007-02-21 2010-06-01 Itt Manufacturing Enterprises Inc. Nearly collision-free channel access system and method
WO2009062194A1 (en) 2007-11-09 2009-05-14 Proxense, Llc Proximity-sensor supporting multiple application services
US8171528B1 (en) 2007-12-06 2012-05-01 Proxense, Llc Hybrid device having a personal digital key and receiver-decoder circuit and methods of use
WO2009079666A1 (en) 2007-12-19 2009-06-25 Proxense, Llc Security system and method for controlling access to computing resources
WO2009102979A2 (en) 2008-02-14 2009-08-20 Proxense, Llc Proximity-based healthcare management system with automatic access to private information
US20100195553A1 (en) * 2008-03-18 2010-08-05 Myers Theodore J Controlling power in a spread spectrum system
US7593383B1 (en) * 2008-03-18 2009-09-22 On-Ramp Wireless, Inc. Uplink transmitter in a random phase multiple access communication system
US7773664B2 (en) * 2008-03-18 2010-08-10 On-Ramp Wireless, Inc. Random phase multiple access system with meshing
US8477830B2 (en) 2008-03-18 2013-07-02 On-Ramp Wireless, Inc. Light monitoring system using a random phase multiple access system
US8520721B2 (en) 2008-03-18 2013-08-27 On-Ramp Wireless, Inc. RSSI measurement mechanism in the presence of pulsed jammers
US7733945B2 (en) * 2008-03-18 2010-06-08 On-Ramp Wireless, Inc. Spread spectrum with doppler optimization
US20090239550A1 (en) * 2008-03-18 2009-09-24 Myers Theodore J Random phase multiple access system with location tracking
US8958460B2 (en) 2008-03-18 2015-02-17 On-Ramp Wireless, Inc. Forward error correction media access control system
US11120449B2 (en) 2008-04-08 2021-09-14 Proxense, Llc Automated service-based order processing
US8363699B2 (en) 2009-03-20 2013-01-29 On-Ramp Wireless, Inc. Random timing offset determination
US8618957B2 (en) * 2009-10-23 2013-12-31 Lojack Corporation Power management system and method for vehicle locating unit
JP5230663B2 (en) * 2010-01-05 2013-07-10 株式会社エヌ・ティ・ティ・ドコモ Radio base station apparatus, mobile terminal apparatus and radio communication method
US9418205B2 (en) 2010-03-15 2016-08-16 Proxense, Llc Proximity-based system for automatic application or data access and item tracking
US8711718B2 (en) * 2010-07-04 2014-04-29 Mediatek Inc. Method and apparatus for reducing power consumption used in communication system having time slots
US8918854B1 (en) 2010-07-15 2014-12-23 Proxense, Llc Proximity-based system for automatic application initialization
US9125043B2 (en) 2010-10-12 2015-09-01 Qualcomm Incorporated Method and apparatus for efficient idle operation in a dual-SIM WCDMA mobile station
US8862161B2 (en) * 2010-10-12 2014-10-14 Qualcomm Incorporated Method and apparatus for efficient idle operation in a dual-SIM CDMA 1X mobile station
JP5307168B2 (en) * 2011-02-14 2013-10-02 クゥアルコム・インコーポレイテッド Updating overhead messages with distributed control
US8857716B1 (en) 2011-02-21 2014-10-14 Proxense, Llc Implementation of a proximity-based system for object tracking and automatic application initialization
US9036496B2 (en) 2012-01-09 2015-05-19 Qualcomm Incorporated Devices and methods for facilitating overhead message updates in wireless communications systems
US9008049B2 (en) * 2012-09-11 2015-04-14 Qualcomm Incorporated Forward link frame generation in a machine-to-machine (M2M) wireless wide area network (WAN)
US9405898B2 (en) 2013-05-10 2016-08-02 Proxense, Llc Secure element as a digital pocket
JP2013192248A (en) * 2013-05-13 2013-09-26 Qualcomm Inc Overhead message update with decentralized control
US10461868B2 (en) 2017-07-05 2019-10-29 Calamp Wireless Networks Corporation Systems and methods for reducing undesirable behaviors in RF communications
US10243766B2 (en) 2017-07-05 2019-03-26 Lojack Corporation Systems and methods for determining and compensating for offsets in RF communications
US10367457B2 (en) 2017-07-06 2019-07-30 Calamp Wireless Networks Corporation Single stage ramped power amplifiers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866709A (en) * 1986-11-28 1989-09-12 The Marconi Company Limited Of The Grove Dynamic frame length communication system
US5040172A (en) * 1987-08-18 1991-08-13 Kabushiki Kaisha Toshiba Communication method utilizing channel highway and digital communication apparatus for realizing the same
US5159596A (en) * 1989-06-26 1992-10-27 Iwatsu Electric Co., Ltd. Mobile communication system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597077A (en) * 1983-05-04 1986-06-24 Cxc Corporation Integrated voice/data/control switching system
US4713808A (en) * 1985-11-27 1987-12-15 A T & E Corporation Watch pager system and communication protocol
US4891805A (en) * 1988-06-13 1990-01-02 Racal Data Communications Inc. Multiplexer with dynamic bandwidth allocation
GB2226475A (en) * 1988-12-23 1990-06-27 Philips Electronic Associated Power economising in multiple user radio systems
JPH03154437A (en) * 1989-11-13 1991-07-02 Nippon Telegr & Teleph Corp <Ntt> Incoming call control system
US5001471A (en) * 1989-12-26 1991-03-19 Motorola, Inc. Paging system employing designated batch information service data message transmission
US5175874A (en) * 1991-04-10 1992-12-29 Motorola, Inc. Radiotelephone message processing for low power operation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866709A (en) * 1986-11-28 1989-09-12 The Marconi Company Limited Of The Grove Dynamic frame length communication system
US5040172A (en) * 1987-08-18 1991-08-13 Kabushiki Kaisha Toshiba Communication method utilizing channel highway and digital communication apparatus for realizing the same
US5159596A (en) * 1989-06-26 1992-10-27 Iwatsu Electric Co., Ltd. Mobile communication system

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5654978A (en) * 1993-11-01 1997-08-05 Omnipoint Corporation Pulse position modulation with spread spectrum
US5666379A (en) * 1993-11-01 1997-09-09 Omnipoint Corporation Best-of-M pulse position modulation detector
US5491718A (en) * 1994-01-05 1996-02-13 Nokia Mobile Phones Ltd. CDMA radiotelephone having optimized slotted mode and long code operation
US6157815A (en) * 1994-09-30 2000-12-05 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
WO1996010895A1 (en) * 1994-09-30 1996-04-11 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
EP1175118A3 (en) * 1994-09-30 2005-03-09 QUALCOMM Incorporated Method and apparatus for providing broadcast messages in a communications network
CN1085027C (en) * 1994-09-30 2002-05-15 夸尔椅姆股份有限公司 Method and apparatus for providing broadcast messages in communications network
EP1324629A3 (en) * 1994-09-30 2005-07-13 QUALCOMM Incorporated Method and apparatus for providing broadcast messages in a communications network
EP1324629A2 (en) * 1994-09-30 2003-07-02 QUALCOMM Incorporated Method and apparatus for providing broadcast messages in a communications network
EP1175118A2 (en) * 1994-09-30 2002-01-23 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
US7035627B1 (en) 1994-09-30 2006-04-25 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
US5832022A (en) * 1995-06-02 1998-11-03 Omnipoint Corporation Method and apparatus for controlling the modulation index of continuous phase modulated (CPM) signals
US5991279A (en) * 1995-12-07 1999-11-23 Vistar Telecommunications Inc. Wireless packet data distributed communications system
WO1997021282A3 (en) * 1995-12-07 1997-08-07 Vistar Telecommunications Inc Wireless packet data distributed communications system
WO1997021282A2 (en) * 1995-12-07 1997-06-12 Vistar Telecommunications Inc. Wireless packet data distributed communications system
CN1074637C (en) * 1995-12-29 2001-11-07 摩托罗拉公司 Channel scanning device and method
FR2743249A1 (en) * 1995-12-29 1997-07-04 Motorola Inc APPARATUS AND METHOD FOR SCANNING TRACKS
WO1998023118A1 (en) * 1996-11-15 1998-05-28 Nokia Telecommunications Oy Dynamic channel allocation
US6832094B2 (en) 1997-05-30 2004-12-14 Qualcomm, Incorporated Dual event slotted paging
US8224356B2 (en) 1997-05-30 2012-07-17 Qualcomm Incorporated Dual event slotted paging
US8068859B2 (en) 1997-05-30 2011-11-29 Qualcomm Incorporated Dual event slotted paging
US6393295B1 (en) 1997-05-30 2002-05-21 Qualcomm Incorporated Dual event slotted paging
US8046005B2 (en) 1997-05-30 2011-10-25 Qualcomm Incorporated Dual event slotted paging
US6111865A (en) * 1997-05-30 2000-08-29 Qualcomm Incorporated Dual channel slotted paging
US7983695B2 (en) 1997-05-30 2011-07-19 Qualcomm Incorporated Dual event slotted paging
US7970420B2 (en) 1997-05-30 2011-06-28 Qualcomm Incorporated Dual event slotted paging
US7555302B2 (en) 1997-05-30 2009-06-30 Qualcomm Incorporated Dual event slotted paging
EP1696670A3 (en) * 1997-07-11 2010-12-01 France Telecom Data signal for modifying a graphic scene, corresponding method and device
US8315659B2 (en) 1997-08-15 2012-11-20 Qualcomm Incorporated Method and apparatus for providing broadcast messages in a communications network
US6564074B2 (en) 1997-10-03 2003-05-13 Hewlett-Packard Company Power management method of and apparatus for use in a wireless local area network (LAN)
US7483699B2 (en) * 1998-09-22 2009-01-27 Qualcomm Incorporated Overhead message update with decentralized control
US7085254B1 (en) 1999-05-29 2006-08-01 Samsung Electronics Co., Ltd. Apparatus and method for gated transmission in CDMA communication system
EP1192746A1 (en) * 1999-07-10 2002-04-03 Samsung Electronics Co., Ltd. Apparatus and method for releasing reverse common channel in cdma communication system
EP1192746B1 (en) * 1999-07-10 2004-11-03 Samsung Electronics Co., Ltd. Apparatus and method for releasing reverse common channel in cdma communication system
US8050724B2 (en) 1999-12-29 2011-11-01 Samsung Electronics Co., Ltd Method for controlling power in wireless telephone set
US9119161B2 (en) 1999-12-29 2015-08-25 Samsung Electronics Co., Ltd Method for controlling power in wireless telephone set
CN1849010B (en) * 2006-03-10 2010-04-14 华为技术有限公司 Terminal addressing method for receiving multimedia broadcasting multi-broadcasting service
WO2014150945A3 (en) * 2013-03-15 2014-11-13 Qualcomm Incorporated Method and apparatus for avoiding network resynchronization in stationary m2m devices
WO2014151087A3 (en) * 2013-03-15 2014-11-20 Qualcomm Incorporated Method and apparatus for fast tch to idle transition
US9338743B2 (en) 2013-03-15 2016-05-10 Qualcomm Incorporated Method and apparatus for avoiding network re-synchronization in stationary M2M devices
US9485727B2 (en) 2013-03-15 2016-11-01 Qualcomm Incorporated Method and apparatus for fast TCH to idle transition

Also Published As

Publication number Publication date
EP0629324B1 (en) 2004-09-22
AU678151B2 (en) 1997-05-22
CN1082272A (en) 1994-02-16
HK1015209A1 (en) 1999-10-08
AU3790693A (en) 1993-10-05
US5509015A (en) 1996-04-16
CN1052593C (en) 2000-05-17
ZA931406B (en) 1994-01-04
AU1482897A (en) 1997-05-15
US5392287A (en) 1995-02-21
HU218335B (en) 2000-07-28
MX9301231A (en) 1994-04-29
IL104911A0 (en) 1993-08-18
CA2130663A1 (en) 1993-09-06
EP0629324A1 (en) 1994-12-21
JPH07505030A (en) 1995-06-01
FI115368B (en) 2005-04-15
EP0629324A4 (en) 1999-09-15
SK282130B6 (en) 2001-11-06
FI944057A0 (en) 1994-09-02
BG99025A (en) 1996-04-30
DE69333633T2 (en) 2005-12-01
AU688706B2 (en) 1998-03-12
JP3193380B2 (en) 2001-07-30
ATE277464T1 (en) 2004-10-15
IL104911A (en) 1996-08-04
CA2130663C (en) 1999-04-13
SK105394A3 (en) 1995-03-08
HUT71650A (en) 1996-01-29
BR9306033A (en) 1997-11-18
KR950700649A (en) 1995-01-16
KR0179402B1 (en) 1999-05-15
RU2114511C1 (en) 1998-06-27
DE69333633D1 (en) 2004-10-28
DK0629324T3 (en) 2005-01-10
HU9402519D0 (en) 1994-11-28
BG61745B1 (en) 1998-04-30
FI944057A (en) 1994-09-02

Similar Documents

Publication Publication Date Title
EP0629324B1 (en) Apparatus and method for reducing power consumption in a mobile communications receiver
US5511110A (en) Cellular phone page system using sequential transmissions of pages over a time-partitioned forward control channel
AU683033B2 (en) Radio system
US4736461A (en) Method of transmitting terminating call signals within a restricted duration and a base station and a portable unit for use in the same
AU764710B2 (en) Method and apparatus for scheduling wake-up time in a CDMA mobile station
EP0960541B1 (en) Circuit for synchronizing cdma mobile phones
KR100350474B1 (en) The adaptive power saving method for digital wireless communication system during standby mode
WO2006083777A2 (en) Paging for non-real-time communications wireless networks
EP1303152B1 (en) Method of monitoring signals among communication systems operating according to different time scales
WO1997012476A1 (en) Method and apparatus for reduced power consumption in a mobile packet data communication system
KR100277056B1 (en) Efficient paging channel control method with distribution of overhead message and change of overhead message transmission period
GB2368235A (en) Preventing data losses due to timing errors in a receiver operating in a power-saving mode
JPH0611119B2 (en) Wireless telephone system
JP4320121B2 (en) Method and apparatus for switching between operating channels with different time references
EP1138123A1 (en) Method and device for conserving power in a cdma mobile telephone

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BG BR CA FI HU JP KP KR PL RO RU SK

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

EX32 Extension under rule 32 effected after completion of technical preparation for international publication

Free format text: KZ

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
EX32 Extension under rule 32 effected after completion of technical preparation for international publication
LE32 Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b)
WWE Wipo information: entry into national phase

Ref document number: 2130663

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 1993907228

Country of ref document: EP

Ref document number: 105394

Country of ref document: SK

Ref document number: 944057

Country of ref document: FI

WWE Wipo information: entry into national phase

Ref document number: 1019940703124

Country of ref document: KR

WWP Wipo information: published in national office

Ref document number: 1993907228

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1993907228

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 944057

Country of ref document: FI