CN101507146A - Smart frequency-hopping by sub-channel transmissions - Google Patents

Smart frequency-hopping by sub-channel transmissions Download PDF

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Publication number
CN101507146A
CN101507146A CNA2007800178394A CN200780017839A CN101507146A CN 101507146 A CN101507146 A CN 101507146A CN A2007800178394 A CNA2007800178394 A CN A2007800178394A CN 200780017839 A CN200780017839 A CN 200780017839A CN 101507146 A CN101507146 A CN 101507146A
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China
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subchannel
channel
main users
transceiver
transmitted
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Chinese (zh)
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E·C·格哈特
W·R·海史密斯
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Data Flow Systems Inc
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Data Flow Systems Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/002Transmission of channel access control information
    • H04W74/004Transmission of channel access control information in the uplink, i.e. towards network
    • 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
    • H04B1/69Spread spectrum techniques
    • H04B1/713Spread spectrum techniques using frequency hopping
    • H04B1/715Interference-related aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J11/00Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023Interference mitigation or co-ordination
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037Inter-user or inter-terminal allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/02Hybrid access techniques

Abstract

A 'smart' sub-channel hopping control mechanism executes one or more sub-channel selection discriminators to enable the communications controller of a spectral reuse transceiver to delineate on which of a plurality sub-channels the spectral reuse transceiver may transmit, so as to substantially reduce the likelihood of triggering squelch circuits of silent radios of primary (licensed) channel users.

Description

Intelligent frequency-hopping by subchannel transmission
The cross reference of related application
The application is the U.S. Patent application S/N.10/730 that awaits the reply jointly in preceding submission that is entitled as " RadioCommunication System Employing Spectral Reuse Transceivers (adopting the radio communications system of spectral reuse transceiver) " that is equaled to submit on December 8th, 2003 by Brent Saunders, the part of 753 (conduct after this ' No. 753 application is quoted from) continues and requires its rights and interests, ' No. 753 applications require to be equaled by Gerhardt the U.S. Patent application S/N.60/432 that is entitled as " Link Utilization Mechanism for Secondary Use ofA Radio Band (being used for radio bands is carried out the link utilization mechanism of secondary use) " of submission on December 10th, 2002,223 rights and interests; The application further requires the U.S. Patent application S/N.60/784 that awaits the reply jointly in preceding submission by E.Gerhardt being entitled as of equaling to submit on March 20th, 2006 " Link Utilization Mechanism for Aggregation of Disjoint RadioBandwidth (being used to assemble the link utilization mechanism of the radio bandwidth of disconnection) ", 105 rights and interests, the disclosure of these two applications all is included in this.
Invention field
The present invention relates generally to communication system and subsystem thereof, relate in particular to ' intelligence ' subchannel jump controlling mechanism, it can be adopted by the communication controler of the spectral reuse transceiver of the communication system of disclosed type in the application of above-indicated ' No. 753 substantially to reduce---and in the mode of the possibility that minimizes the wireless squelch circuit that the licensed user who transmits of triggering ' mourns in silence ' under the optimal situation on current inactive main channel, describe that this spectral reuse transceiver can be in (can reuse for secondary user's potentially because main channel has activity) a plurality of subchannels which go up and transmit.
Background of invention
Described in above-indicated ' No. 753 application, in some radio bandses as the 217-220MHz VHF frequency band of indefiniteness example, governmental approval agency (for example Federal Communications Committee (FCC)) authorizes usually and mainly obtains the permission person nonexcludability of this frequency band is used to use it for such as with by the various communication services of promptly saying the voice transfer.The licensed for this reason use of these main users is paid, and is expecting that they can not meet with other users' interference.The secondary user's that also allows FCC inserts identical channel in same frequency band and this frequency band on ' noiseless ' or secondary basis, thus as long as main users is not being used certain channel, this channel just can be by secondary non-permitted user use.
The similar agency of FCC and foreign country constantly seeks the use that permission expands these licensed radio frequency bands and does not reduce the approach of the service quality that can use main users.For secondary user's, these frequency bands provide the free opportunity that splendid radio transmission properties is arranged for remote measurement and other application.Because secondary user's must not be disturbed main users, so main users causes it to send the administration order that requires this secondary user's to move on to another part of this frequency band or leave this frequency band fully to the interference complaint possible outcome of FCC.So spectral transition is destructive for the service of secondary user's and may is expensive, if require site access, apparatus modifications or exchange could realize this compulsory change then more so.Therefore will figure out, need the mechanism that allows secondary user's on glitch-free basis, to adopt licensed frequency band and contingency to have new main users appearance then this wireless frequency of accommodation to be used badly.It should be noted that main users always has the priority better than secondary user's, for secondary user's, at first do not use the right of channel frequency.
Advantageously, the invention described in No. 753 application of above-indicated ' has successfully solved these needs by means of the link utilization controlling mechanism based on the spectrum activity of being monitored.Look back this link utilization controlling mechanism briefly, it is intended to use with the communication system of star configurations, such as in the reduction of Fig. 1 described among the figure of complexity, the spectral reuse transceiver that is installed in home site 10 places is communicated by letter with corresponding each spectral reuse transceiver that is installed in a plurality of remote sites 12 places.Each spectral reuse transceiver is used to produce noiseless radio channel or subsets of sub-channels with the frequency hopping form work through selective filter.
For this purpose, home site 10 is periodically initiated each clear channel assessment routine of all participating in this home site and all remote sites 12, with compiling or ' collection ' noiseless or i.e. tabulation of ' emptying ' subchannel (such as the wide subchannel of 6.25KHz), but it can be used to carry out can not disturb any user's of being allowed communication session openly by the participant of this network.By only transmitting being determined on the subchannel that is positioned at clear channel, the spectral reuse transceiver of respective site is just guaranteed that it will can not disturb any main users of this band of interest.
Except its when master site transmits message, each remote user sites is all sequentially progressively passed through according to the known pseudorandom of all user's priori of this network (PN) jump sequence and is monitored (it had before obtained from home site) current clear channel list, to seek the message that may be sent to it by master site transceiver.During the preamble period of any message that is transmitted by home site, the transceiver of each remote site scans all interior frequency grooves of given frequency spectrum to seek the appearance of energy.Any frequency groove that comprises the energy that is higher than defined threshold all is marked as non-clear channel, and all the other channels are identified as and empty (and therefore can for reusing) channel.
Whenever remote site notices that when changing on its clear channel assessment, it reports to home site with this on every possible occasion.When home site had received clear channel list from all remote sites, it logically made up all these clear channel list to produce composite clear channel list.This composite clear channel list be stored in the transceiver of home site and in these clear channel according on of the regulation of PN sequence selection to all remote sites broadcasting, wherein clear channel is optionally used between the user of this network by this PN sequence.When this composite clear channel list was received at corresponding each remote site place, it was stored in its transceiver.
Be all communicate by letter all by synchronously by rights (on (compound) clear channel list and each unit traversal or ' jump ' meanings) between the user who guarantees this network that the transceiver of home site transmits initial message on the clear channel that the priori that each remote unit all monitors is set up by the order of the clear channel clauses and subclauses institute warp of this clear channel list.This initial message comprises the sign, PN sequence tap list of this clear channel list, preamble channel and is the PN seed of the initial channel that lasts definition of transmission paroxysm on the horizon and jump sequence.In case remote site has received initial message, then this website just will be transferred to normal multiple access pattern.
Obtain the further details of the operation of the framework of disclosed spectrum reuse controlling links mechanism in No. 753 application of cited above ', can be with the attention directing document.They will be not at this detailed description so that this explanation is focused on
On the problem that ' mourning in silence ' receiver disturbs, the squelch circuit of this problem can make ' emptying ' and therefore potential available secondary transmission of reusing on the subchannel receiver that causes main users to be mourned in silence---be current not at the channel that comprises so ' emptying ' subchannel that transmits but monitoring main users to seek those main users receivers of (from another main users) transmission---is activated inadvisablely.
Summary of the invention
According to the present invention, by use for the communication controler of this spectral reuse transceiver equipment ' intelligence ' subchannel jump controlling mechanism that the subchannel of one or more regulation selects filter or discriminator with control its ' emptying ' thereby or the mode of jumping between potential available subchannel substantially reduces and minimize under the optimal situation receiver that main users mourns in silence can be in these subchannel transmission integration go out the possibility that script is enough to cause the energy that its squelch circuit is activated, this receiver interference problem of ' mourning in silence ' is just successfully solved.
In these discriminators first relates to ' time of staying ' or the transmission of restriction cost on the subchannel that jumps to and lasts, thus will comprise energy density in the main users channel (such as 12.5KHz with by promptly saying voice channel) of this subchannel reduce to can avoid be tuned to the value that is activated of the wireless squelch circuit of this main users channel.
Second discriminator relates to refusal or does not jump to the subchannel that the most recent (just formerly) was transmitted, and the 3rd discriminator relates to the refusal subchannel that jumps to of direct " adjoining " on frequency spectrum, promptly adjoins the subchannel of (than its high subchannel that jumps to or than its low subchannel that jumps to) on frequency spectrum mutually with the subchannel that before had been transmitted.
Be similar to the effect of first discriminator, do not jump to squelch circuit that " the most recent transmission " subchannel or " frequency spectrum adjoins " subchannel prevent the receiver that the main users channel of subchannel so (be tuned to comprise) is mourned in silence as the energy in integration this subchannel originally---and work as the fashionable squelch circuit that may be enough to trigger this receiver of energy bins in this energy and the subchannel previous or that frequency spectrum adjoins.
The 4th discriminator relates to refusal or does not jump to the subchannel that ' center ' that be positioned at the main users channel on the frequency spectrum located.' center ' of main users channel means its centre frequency subchannel consistent with the centre frequency of this main users channel, or with this main users channel centre frequency crossover that may be subdivided into and this main channel or those subchannels of directly adjoining in a consistent subchannel.The 4th discriminator has been avoided these subchannels, replaces those subchannels that only jump to ' edge ' that adjoin this main channel on the frequency spectrum.So only optionally using the subchannel of edge-adjacent to play once more that the energy density that squelch circuit is seen minimizes and reduce this squelch circuit by this near the centre frequency of this main channel can be by the effect of the possibility of the activated with energy in this subchannel transmission.
The accompanying drawing summary
The general frame of Fig. 1 graphic extension communication network, its corresponding each terminal unit transceiver stations adopts the spectral reuse transceiver of disclosed invention in No. 753 application of cited above ';
Fig. 2 caption is cited above ' mourn in silence receiver interference level and the relation between the time of staying in the spectral reuse transceiver of type described in No. 753 applications;
Fig. 3 be used to realize to refuse the most recent use with frequency spectrum on the flow chart of routine of subchannel discriminator of the subchannel that adjoins;
Fig. 4 be illustrate 6.25KHz, 12.5KHz, 25KHz and 50KHz the main users channel distribution reduction the spectrogram of complexity;
Fig. 5 is the spectrogram that illustrates on the frequency spectrum in abutting connection with two 6.25KHz subchannels at the edge of 12.5KHz main users channel;
Fig. 6 is the spectrogram that the band structure of the 25KHz main users channel that is divided into 4 6.25KHz subchannels is shown;
Fig. 7 is the spectrogram that the band structure of the 50KHz main users channel that is divided into 8 6.25KHz subchannels is shown; And
Fig. 8 illustrates corresponding each step that the subchannel of realizing avoiding channel center's formula discriminator of may be utilized is selected routine.
Describe in detail
Before the details of describing ' intelligence ' of the present invention subchannel jump controlling mechanism, should observe the present invention relates in essence to the amplification by the subchannel jump controlling mechanism of the communication control processor execution of the spectral reuse transceiver of disclosed type in No. 753 application of cited above ', it relates to the discriminator of carrying out one or more regulation or subchannel is selected filter, thereby the script that the receiver that main users is mourned in silence can be seen is enough to cause the minimizing possibility of the sub-channel energy that its squelch circuit is activated.As will be described, by the operation of being controlled this transceiver by the employed configuration parameter of communication controler of disclosed transceiver in ' No. 753 applications just is set suitablely, just can realize these filtering functions.The framework of the transceiver of ' No. 753 applications remains unchanged.As a result of, the present invention is shown by the graphic extension of easy understanding in the accompanying drawings, these accompanying drawings comprise general network architecture diagram and channel subdivision graph, its those details related to the present invention only are shown in case the disclosure by conspicuous details being fallen into oblivion for the those skilled in the art that benefit from explanation herein.
Briefly point out as above, according to each the essential target in these discriminators in the amplification of antithetical phrase channel hopping controlling mechanism of the present invention be substantially reduce or minimize any subchannel of transmitting by spectral reuse transceiver can receiver that main users is mourned in silence be tuned to channel in present the possibility of the energy of the squelch circuit that is enough to trigger this receiver.Indefiniteness but preferably, so the example of discriminator comprises: 1-is limited in ' time of staying ' (the lasting of transmission) on the subchannel that jumps to; 2-refuses (not jumping to) the most recent subchannel that transmitted; The 3-refusal is the subchannel of ' adjoining on frequency spectrum ' directly; And ' center ' that be positioned at the main users channel on 4-refusal frequency spectrum subchannel of locating.The operation of each in these discriminators and effect will be discussed respectively following.
For ease of understand first discriminator function and the effect of---time of staying---, can be with attention directing Fig. 2, its caption is cited above ' mourn in silence receiver interference level and the relation between the time of staying in the spectral reuse transceiver of type described in No. 753 applications.As already pointed out, the span line that ' time of staying ' means spectral reuse transceiver remained in time span on the selected subchannel in the past jumping to new subchannel.Typically, the time of staying measures with code element number, bit or millisecond.In the chart 20 of Fig. 2, the time of staying is the point along transverse axis 22, and interference is the point along the longitudinal axis 24.As can be seen from this chart, reduce time of staying on subchannel play energy density in the main users channel that will comprise this subchannel (such as 12.5KHz with by promptly saying voice channel) reduce to can avoid be tuned to the effect of the value that is activated of the wireless squelch circuit of this main users channel.
The chart 20 of Fig. 2 generally is applicable to frequency-hopping radio; The actual value of the each point on this chart will depend on the specific implementation of controlling mechanism of the employed frequency hopping time of staying of this radio.It should be noted that, the time of staying and realize complexity and sub-channel availability among each between have compromise.It may not be inappreciable will reducing to extremely short interval the time of staying, because it has increased the complexity of design.In addition, depend on the realization of time of staying controlling mechanism,, have minimizing on the possible throughput along with the time of staying reduces.Thus, the actual time of staying on the subchannel that jumps to is that manufacturer is based on choosing that performance, realization complexity and the supervision constraint of expection are done.
As indefiniteness but practical illustrating, (or still less the value of) the order of magnitude provides subchannel transmission to trigger to mourn in silence the remarkable reduction on the possibility of receiver noise elimination will to reduce to 5 code elements the time of staying.This be since reduce primary effect that the time of staying be transmitted on the corresponding subchannel that jumps to or transmission last be reduced receiver that main users mourns in silence be tuned to subscriber channel (such as 12.5KHz voice radio subscriber channel) in energy density, and reduced the possibility that affined subchannel transmission of the time of staying can trigger the squelch circuit of receiver by this.
Can be used for by the communication controler of transceiver reducing or minimize mourn in silence receiver be tuned to the bandwidth of channel in second discriminator or the filter of amount of the sub-channel energy that presents cause this communication controler refusal with working or do not jump to the most recent used or subchannel that jumps to just formerly.Described belowly relate to incrementally ' skimming over ' transmission frequency in the relative simple filtering mechanism shown in the flow chart of Fig. 3---for example, from lowest sub-channel to the highest subchannel (or on the contrary from the highest subchannel to lowest sub-channel), this has guaranteed not have subchannel can be used to twice directly in succession jump.
The 3rd discriminator relates to the refusal subchannel that jumps to of direct ' adjoining ' on frequency spectrum, promptly adjoin the subchannel of (than its high subchannel that jumps to or than its low subchannel that jumps to) on frequency spectrum mutually with the subchannel that before had been transmitted.Be similar to the effect of first discriminator, according to second discriminator do not jump to the most recent subchannel that transmitted or according to the 3rd discriminator do not jump to the subchannel that adjoins on the frequency spectrum prevent main users be tuned to comprise receiver of mourning in silence of the channel of subchannel so squelch circuit as the energy in this subchannel of integration originally---work as this energy and before or the fashionable squelch circuit that may be enough to trigger this receiver of energy bins in the subchannel that adjoins on the frequency spectrum.
As in the situation of second discriminator, refusal directly the subchannel that jumps to of ' on frequency spectrum, adjoining ' can be easily by incrementally skimming over transmission frequency and jump every n subchannel, and as if need then using the next one value of n to repeat to finish.For example, be that spectral reuse transceiver can be used the subchannel of idol numbering and use the subchannel of strange numbering subsequently, repeats if needed under 2 the situation in the n value.Depend on selected realization, can use selection more at random.Subchannel selects distribution function (such as even distribution or Gaussian Profile) can be further to be retrained by the density function that is used for refusal and can increases the selection of the energy density in this frequency band any one or the more a plurality of subscriber channel.For example, subchannel refusal filter weekly the phase ' t ' forbid ' n ' individual transmission, wherein ' n ' and ' t ' is the parameter of this filter.After so refusing, can reuse this distribution function and find out new ' candidate ' subchannel.
More specifically, as shown in Figure 3, realize that effectively the filter routine of the second and the 3rd discriminator functions has initialization inlet point 31 as described above, appointment to a last subchannel that jumps to therein is set as invalid value (for example-1), and the so feasible at first chosen subchannel that jumps to is effective (by filtering) always.Next hop channel step 32 is chosen by the subchannel that the operation of calling pseudorandom number sequencer (PNSEQ) step 33 causes the next one to jump to subsequently.PNSEQ step 33 when being called, export available jump to one of subchannel be appointed as ' candidate ' jump to channel based on pseudorandom numeral.
This candidate jumps to subchannel and is coupled to channel comparison step 34 subsequently, its determine this candidate by the appointment of PNSEQ step 33 jump to subchannel whether be with last one effectively to jump to subchannel be jumping to subchannel or ' adjoining ' with it of ' identical '.If this candidate jump to channel with this on one effectively jump to channel ' identical ' or ' adjoining ', then channel comparison step 34 provides output 35 to be used to select new candidate to jump to subchannel to PNSEQ step 33.Otherwise channel comparison step 34 jumps to subchannel with this candidate and supplies with hop step 36, and the latter jumps to the frequency hopping controlling mechanism that subchannel exports transceiver to this candidate, thereby causes this transceiver to be tuned to this subchannel.Although (should notice that in the routine of Fig. 3 the selection of next candidate being jumped to subchannel is based on pseudorandom, but as equivalent alternative, it can not be based on pseudorandom (for example, directly in succession jump to subchannel or every n jumps to subchannel)).
Along with disturbing traffic to increase, the number of available subchannels will reduce, and at certain a moment, this distribution filter perhaps can not find any candidate sub-channel that can satisfy the discriminator function.In this case, be the filter deployment parameter as following interference avoidance strategy---such as lower priority radio traffic is carried out flow control or in this network all traffics carry out result the flow control, service quality will reduce.If should allow by strategy, then frequency hop sequences can be repeated, and transmission density may increase (on disturbing the increase that is associated being arranged) in such circumstances, but throughput will remain unchanged.These frequency hop sequences can be managed in frequency domain and time domain so that the ratio of energy density and time minimizes in the various subscriber channel, make the minimizing possibility of the squelch circuit that activates succession by this.
The 4th is that ' avoiding channel center ' discriminator relates near the subchannel that ' center ' that be positioned at the main users channel on refusal (the not jumping to) frequency spectrum located or it is.The transmission meeting that ' middle heart ' location means this subchannel is injected the frequency spectrum core of this main users channel with energy, and the receiver of mourning in silence there is sensitive especially.As example, the centre frequency of subchannel may be consistent with the centre frequency of this main users channel, or with the centre frequency crossover of this main channel or directly adjoin.The 4th discriminator only jumps to the center that can be considered on frequency spectrum with this main channel and has those subchannels of displacement to avoid these subchannels by replacing, thereby close or adjoin ' edge ' of this main channel.Thereby so only use the subchannel of edge-adjacent to play once more to alleviate subchannel to inject energy is injected that near the frequency spectrum core of this main users channel the sees squelch circuit centre frequency of this main channel energy density minimizes and reduce this squelch circuit by this can be by the effect of the possibility of the activated with energy of this subchannel transmission for selectivity.
In order just to choose so ' edge ' related subchannel suitablely, the 4th discriminator depends on the spectrum structure of the channel plan of this frequency band.Illustrate as indefiniteness, consider the spectrum structure of licensed 217-220MHz frequency band cited above, as the reduction of Fig. 4 explanation as illustrated in the spectrogram of complexity, it comprises respectively the distribution at 6.25KHz, 12.5KHz, 25KHz and the 50KHz subscriber channel shown in 41,42,43 and 44 places.The frequency spectrum inconsistency of these interchannels is to be to be caused for various these facts of main users in response to the increment request for allocation by permission sequentially as time passes by them on the one hand, and is owing to being required to satisfying the bandwidth demand that continues to increase to stricter direction evolution by the spectrum efficiency of FCC promulgation.
For the band structure example of Fig. 4, the strobe utility that is adopted by the 4th discriminator is selected being positioned at corresponding each 12.5KHz and 25KHz main users channel 42 and 43 edge or those 6.25KHz subchannels consistent with it or that be included on the frequency spectrum in the 6.25KHz subchannel that adjoins on two pairs of frequency spectrums at the edge of 50KHz main users channel 44 in any one give preferential hopped sub-channels sequence.This just can understand by the spectrogram with reference to figure 5,6 and 7.
Particularly, Fig. 5 is illustrated on the frequency spectrum respectively in abutting connection with two 6.25KHz subchannels 51 at the edge 55,56 of 12.5KHz main users channel 50 and 52, so makes the centre frequency of 6.25 KHz subchannel 51 and 52 with the centre frequency of 12.5KHz main users channel 50 displacement be arranged on frequency spectrum.Therefore, in the chooser channel 51 and 52 any will cause spectral reuse transceiver therein frequency of heart transmitting on the frequency spectrum with on the isolated subchannel of centre frequency of 12.5KHz main users channel 50; Equally, as shown in Figure 5, the energy in any subchannel 51/52 is minimum at centre frequency 53 places of 12.5KHz channel 50.
Fig. 6 illustrates the band structure of 25KHz main users channel 60, has 4 6.25 KHz subchannels 61,62,63 and 64 to use therein.In these 4 subchannels, therefore subchannel 61 and 64 respectively in abutting connection with the outward flange 66 and 67 of 25KHz main users channel 60, and can be denoted as ' outward ' subchannel on frequency spectrum; And on the other hand, adjoin the centre frequency 65 of 25KHz main users channel 60 on subchannel 62 and 63 frequency spectrums and therefore can be denoted as ' interior ' subchannel.As can be seen from Figure 5, only edge-adjacent or promptly transmit and will inject less energy on ' outer ' subchannel 61 and 64 to the frequency spectrum core of 25KHz main users channel 60, and therefore typically than near ' interior ' subchannel 62 and 63 of the centre frequency of subscriber channel 60 on any transmission for be tuned to the squelch circuit of the receiver of mourning in silence of this 25KHz subscriber channel will have still less influence.As a result of, in ' outside ' subchannel 61 and 64 on any transmission will reduce this squelch circuit can be by the possibility of the activated with energy in any in these two ' outside ' subchannels.
May notice that for the situation at use 12.5KHz shown in Fig. 5 and 6 and 25KHz main users channel, more if desired (6.25KHz) subchannel then can be made progressive selection and be selected to stride these main users channels subchannel that distributes equably.Can give preferentially in given time quantum to second in two in the 25KHz subscriber channel 60 ' outside ' 6.25 KHz subchannels 61 and 64, second in this two 6.25 KHz subchannels 51 and 52 interior with using 12.5KHz subscriber channel 50 is relative.In addition, the choosing of subchannel can so make spectral reuse transceiver will can not make in any 25KHz voice channel to adjoin subchannel jumps, and makes the energy integral influence of squelch circuit of succession minimize by this.
Fig. 7 illustrates the band structure of 50KHz main users channel 70, has 8 6.25 KHz subchannels 71,72,73,74,75,76,77 and 78 to use therein.In these 8 subchannels, in abutting connection with corresponding each edge 70-1 and the 70-2 of 50KHz main users channel 70, and it is right therefore can be designated as ' outward ' subchannel on frequency spectrum for the two pairs of subchannels that adjoin mutually 71,72 and 77,78; And the two pairs of subchannels that adjoin mutually 73,74,75 and 76 centre frequencies 79 of adjoining 50KHz main users channel 70 on frequency spectrum, and it is right therefore can be designated as ' interior ' subchannel.As can be seen from Figure 7, only the subchannel of edge-adjacent transmit on to 71,72 and 77,78 will reduce substantially (under optimal situation, minimizing) by be tuned to the energy density seen of the receiver of mourning in silence of 50KHz main users channel 70 (centre frequency), and reduce its squelch circuit by this can be by the possibility of the activated with energy in any one any subchannel in this two couple ' outward ' subchannel.
Fig. 8 illustrates corresponding each step of the filter routine that realizes above ' avoiding channel center ' discriminator of describing with reference to figure 5-7 of may be utilized.Particularly, the routine of Fig. 8 plays by avoiding sending the effect that the mitigate against silent receiver disturbs on those (6.25KHz) subchannels at ' center ' of invading the subscriber channel that is assigned with.As described above, the center of main users channel depend on planning that this radio bands is used may with one or more candidate sub-channel crossover.In addition, notice that once more term ' center ' is not to be defined to particular band location, but can contain one or more subchannel---such as three subchannels that jump to---as this ' center '.
The filter routine of Fig. 8 has initialization inlet point 81, and the appointment of an employed therein last subchannel that jumps to is defaulted as invalid value (for example-1), and the so feasible at first chosen subchannel that jumps to is effective (by filtering) always.Next hop channel step 82 is selected by the subchannel that the operation of calling pseudorandom number sequencer (PNSEQ) step 83 causes the next one to jump to.PNSEQ step 83 when being called, export available (6.25KHz) jump to one of subchannel be appointed as ' candidate ' jump to channel based on pseudorandom numeral.
This candidate jumps to subchannel and is coupled to relatively step 84 of centre frequency subsequently, and it determines the subchannel candidate whether PNSEQ step 83 has selected the next one with the center crossover of this user's channel to jump to.If the center crossover of this candidate sub-channel and this user's channel, then centre frequency comparison step 84 provides the output 85 that causes PNSEQ step 83 to select the subchannel that new candidate will jump to.Otherwise centre frequency comparison step 84 is this candidate sub-channel passs hop step 86, and the latter exports this candidate sub-channel to spectral reuse transceiver wireless frequency hopping controlling mechanism, causes its transmitter to be tuned to this subchannel.Once more, as in the filter routine of Fig. 3, the selection to next candidate sub-channel in the routine of Fig. 8 needs not to be based on pseudorandom, but can not be based at random (for example, directly in succession jump to subchannel or every n jumps to subchannel).
As described above, the communication control processor of the spectral reuse transceiver of the communication system of disclosed type can adopt one or more persons in these discriminators described above in the application of already pointed out ' No. 753.Use choosing of which discriminator to depend on the user.For the purpose of optimal performance, not all to be the minimizing possibility of squelch circuit of the receiver of most current employings even adopt 4 whole discriminators to make to trigger yet.Yet, even if adopted all above discriminators, the possibility that still has the wireless squelch circuit of mourning in silence of some main users to be triggered by subchannel transmission.This possibility is attributed in these years user so and has bought its (with by promptly) radio and the product cost of these different manufacturers is different and may not observe common quality and this fact of performance standard collection from different manufacturers.As a result of, the sensitivity of these wireless squelch circuits is different.
For example, some squelch circuits do not have significant selectivity (maybe can be transferred to low arbitrarily), and can be in response to true random noise under very near the situation of Noise Background in squelch threshold.Along with the threshold approaches Noise Background of squelch circuit, it stops to provide the differentiation between useful signal and the noise.In addition, though it is very important avoiding in the consecutive transmissions that (jumps to) in succession on transmission and the same subchannel in given subscriber channel on the subchannel that adjoins on the frequency spectrum as more a plurality of references second and the 3rd discriminator are described, but it also is very important managing subchannel transmission with coarsegrain more, and this can realize in time domain.Thus, use multiple discriminator should prevent the accumulation significantly in time in any subscriber channel of energy in each subchannel transmission effectively, the worthless increase of sub-channel energy density seen of mitigate against silent receiver by this.
Yet, if (with by promptly saying) wireless receiver of main users has low relatively signal processing/filter capacity, even if its squelch circuit may be triggered by the subchannel transmission of secondary user's---used all these discriminators.Just in case this thing happens, can expect that this main users will complain to FCC.In this case, it is the configuration parameter that spectral reuse transceiver is set that the practicality of secondary user's is demanded, and make that so this infringement prescription channel is forever got rid of from this clear channel assessment routine, or ' cutting ' removes.This will prevent that this routine from seeking this again and offending activity in the prescription channel, and eliminate the possibility that the subchannel of so forever being got rid of can activate this side of complaint user's the wireless squelch circuit of mourning in silence effectively by this.
As figuring out from above-mentioned explanation, as above quote ' triggering that the transmission adopted in the spectrum reuse communication system of disclosed type in No. 753 applications ' empties ' result of subchannel be allowed the possibility of the main squelch circuit of the receiver of mourning in silence of channel user according to the present invention by means of comprise that one or more or subchannel select ' intelligence ' jump controlling mechanism of the discriminator stipulated or filter substantially to be reduced and be minimized under optimal situation, this makes emission side spectral reuse transceiver can substantially reduce the amount of the transmission sub-channel energy that may be sensed by the receiver of mourning in silence, because this spectral reuse transceiver sequentially jumps to potential available subchannel and transmission thereon.Under the situation of optimum, this plays and makes the receiver of mourning in silence will otherwise cause the effect of minimizing possibility of enough energy of the activation of its squelch circuit in the integron Channel Transmission.
Though we have illustrated and have described according to some embodiment of the present invention, it should be understood that the present invention is not defined to this, but numerous changes and modification known to the capable field technique personnel of energy, therefore and we do not wish to be defined to details shown and that describe herein, and be intended to contain for those of ordinary skills conspicuous all so change and revise.

Claims (20)

1. one kind by sending the RF method for communicating between corresponding each transceiver that communicates network on the selected subchannel in the main users channel that is included in the radio frequency of regulation (RF) communication band, said method comprising the steps of:
(a) the RF communication band that monitors described regulation to be seeking the appearance of communication activity on the described subchannel, and those subchannels that do not have communication activity in the described subchannel on actual effect are designated the potential subchannel that empties for described corresponding each transceiver use; And
(b) make described corresponding each transceiver by controllably jumping and transmit thereon, between it, carry out RF communication in the described mode that reduces to the value that can realize alleviating the squelch circuit that activates the receiver of on described main users channel, operating with the sub-channel energy density in the main users channel of the subchannel that will comprise described regulation that empties between those subchannels of stipulating in the subchannel.
2. the method for claim 1 is characterized in that, step (b) comprises the time of staying of the subchannel that constraint is transmitted.
3. the method for claim 1 is characterized in that, step (b) comprises is one after the other jumping between the non-subchannel that adjoins on the frequency spectrum and transmitting.
4. the method for claim 1 is characterized in that, step (b) comprises that the mode to avoid being transmitted in the same sub-channel that had been transmitted during the jump just formerly one after the other jumps to and transmit selected subchannel.
5. the method for claim 1 is characterized in that, step (b) comprises and transmitting and the core of the described main users channel subchannel of crossover not.
6. the method for claim 1 is characterized in that, step (b) comprises the subchannel that is transmitted in the edge that is positioned at the main users channel on the frequency spectrum.
7. the method for claim 1 is characterized in that, step (b) comprises in the operation or more multinomial below the execution:
The i-constraint is transmitted the time of staying of subchannel,
Ii-is one after the other jumping between the non-subchannel that adjoins on the frequency spectrum and is transmitting,
Iii-one after the other jumps to and transmits subchannel in the mode of avoiding being transmitted in the same sub-channel that had been transmitted during the subchannel jump just formerly,
The core of iv-transmission and described main users channel is the subchannel of crossover not, and
V-transmits the subchannel that is positioned at the edge of main users channel on the frequency spectrum.
8. method as claimed in claim 7 is characterized in that, step (b) comprises carries out multinomial among the described operation i-v.
9. one kind by sending the RF method for communicating between corresponding each transceiver that communicates network on the selected subchannel in the main users channel that is included in the radio frequency of regulation (RF) communication band, said method comprising the steps of:
(a) the RF communication band that monitors described regulation to be seeking the appearance of communication activity on the described subchannel, and the subchannel that will manifest the energy that is lower than setting is designated and potentially effectively empties subchannel for described corresponding each transceiver use; And
(b) make described corresponding each transceiver jump and transmit thereon in the described mode that is constrained in the value of the squelch circuit that can prevent to activate the receiver of on described main users channel, operating effectively with the sub-channel energy density in the main users channel that will comprise described selected subchannel that empties in the subchannel between some selected subchannels.
10. method as claimed in claim 9 is characterized in that, step (b) comprises in the operation or more multinomial below the execution:
The i-constraint is transmitted the time of staying of subchannel,
Ii-is one after the other jumping between the non-subchannel that adjoins on the frequency spectrum and is transmitting,
Iii-one after the other jumps to and transmits subchannel in the mode of avoiding being transmitted in the same sub-channel that had been transmitted during the subchannel jump just formerly,
The core of iv-transmission and described main users channel is the subchannel of crossover not, and
V-transmits the subchannel that is positioned at the edge of main users channel on the frequency spectrum.
11. method as claimed in claim 10 is characterized in that, step (b) comprises carries out multinomial among the described operation i-v.
12. method as claimed in claim 9 is characterized in that, step (b) comprises that constraint is transmitted the time of staying of subchannel.
13. method as claimed in claim 9 is characterized in that, step (b) comprises is one after the other jumping between the non-subchannel that adjoins on the frequency spectrum and is transmitting.
14. method as claimed in claim 9 is characterized in that, step (b) comprises that the mode to avoid being transmitted in the same sub-channel that had been transmitted during the jump just formerly one after the other jumps to and transmit subchannel.
15. method as claimed in claim 9 is characterized in that, step (b) comprises and transmitting and the core of the described main users channel subchannel of crossover not.
16. method as claimed in claim 9 is characterized in that, step (b) comprises the subchannel that is positioned at the edge of main users channel on the transmission frequency spectrum.
17. improvement of between corresponding each spectral reuse transceiver of communication network, carrying out in radio frequency (RF) method for communicating, wherein said transceiver monitor the RF communication band of regulation is included in the appearance of the communication activity on the subchannel in the main users channel of RF communication band of described regulation and will manifests the energy that is lower than setting with searching those subchannels be designated potential for described corresponding each spectral reuse transceiver use effectively empty subchannel, described improvement may further comprise the steps:
Make described corresponding each spectral reuse transceiver jump and transmit thereon in the described mode that is constrained in the value of the squelch circuit that can prevent to activate the receiver of on described main users channel, operating effectively with the sub-channel energy density in the main users channel that will comprise described selected subchannel that empties in the subchannel between some selected subchannels.
18. improvement as claimed in claim 17 is characterized in that, the described step that makes comprises in the operation or more multinomial below the execution:
The i-constraint is transmitted the time of staying of subchannel,
Ii-is one after the other jumping between the non-subchannel that adjoins on the frequency spectrum and is transmitting,
Iii-one after the other jumps to and transmits subchannel in the mode of avoiding being transmitted in the same sub-channel that had been transmitted during the subchannel jump just formerly,
The core of iv-transmission and described main users channel is the subchannel of crossover not, and
V-transmits the subchannel that is positioned at the edge of main users channel on the frequency spectrum.
19. improvement as claimed in claim 18 is characterized in that, the described step that makes comprises multinomial among the executable operations i-v.
20. improvement as claimed in claim 18, it is characterized in that, described transceiver is configured to manifesting the subchannel that is designated one or more regulation in the RF communication band of getting rid of described regulation in the potential process of using for described corresponding each spectral reuse transceiver that effectively empties subchannel owing to the appearance of communication activity less than the subchannel of the energy of described setting, and wherein saidly makes step comprise to make described corresponding each spectral reuse transceiver to empty between some subchannels of selecting in the subchannel mode that is constrained in the value of the squelch circuit that can prevent to activate the receiver of operating effectively on described main users channel with the sub-channel energy density in the main users channel that will comprise described selected subchannel the subchannel of getting rid of described one or more regulation described to jump and transmission thereon.
CNA2007800178394A 2006-03-20 2007-03-09 Smart frequency-hopping by sub-channel transmissions Pending CN101507146A (en)

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