CN103118430A - Method and device of space division decision - Google Patents
Method and device of space division decision Download PDFInfo
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- CN103118430A CN103118430A CN2011103652821A CN201110365282A CN103118430A CN 103118430 A CN103118430 A CN 103118430A CN 2011103652821 A CN2011103652821 A CN 2011103652821A CN 201110365282 A CN201110365282 A CN 201110365282A CN 103118430 A CN103118430 A CN 103118430A
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Abstract
The invention provides a method and a device of space division decision, the invalid frame probability of top N frames of each frame is calculated through introducing of sliding windows to the space division decision, and the space division decision is carried out according to the calculated probability. Accuracy of the space division decision is improved, so that the space division probability is increased under the condition that actual channel isolation is very high, and the space division probability is decreased under the condition that the actual channel isolation is very low.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of method and device that carries out judgement in empty minute.
Background technology
Under indoor environment, if two interchannel isolations are very large, can think that the interference between two users is very little, satisfy empty minute condition, these two users can use identical ascending resource (for example: dispatch simultaneously two HSUPA users that use same asset) or downlink resource (for example: dispatch simultaneously two HSDPA users that use same asset).
Fig. 1 is that two users' sky divides schematic diagram.Fig. 1 is divided into example with up HSUPA sky, wherein:
UE1 and UE2 represent respectively two users;
I is the strongest passage group number of UE1, and j is the strongest passage group number of UE2;
M is the interior number of active lanes of the strongest passage group of UE1, and N is the interior number of active lanes of the strongest passage group of UE2;
φ
1iThe path loss of UE1 on passage group i, φ
1jThe path loss of UE1 on passage group j;
φ
2iThe path loss of UE2 on passage group i, φ
2jThe path loss of UE2 on passage group j.
UE1 and UE2 can empty condition of dividing be:
(1) demodulation threshold of the signal strength signal intensity-UE2 after the UE1 despreading to interference＞UE1 of UE1;
(2) demodulation threshold of the signal strength signal intensity-UE1 after the UE2 despreading to interference＞UE2 of UE2.
That is:
(1) (transmitting power-φ of UE1
1i+ antenna gain+spreading gain)-(transmitting power-φ of UE2
2iThe demodulation threshold of)＞UE1;
(2) (transmitting power-φ of UE2
2j+ antenna gain+spreading gain)-(transmitting power-φ of UE1
1jThe demodulation threshold of)＞UE2.
The transmitting power of UE equals received power+path loss, and therefore, two top formula can be transformed to:
(1) (UE1 is at received power+antenna gain of passage group i+spreading gain)-(UE2 is to received power+φ of passage group j
2j-φ
2iThe demodulation threshold of)＞UE1
(2) (UE2 is at received power+antenna gain of passage group j+spreading gain)-(UE1 is to received power+φ of passage group i
1i-φ
1jThe demodulation threshold of)＞UE2
Above-mentioned two formula are called empty minute formula.Above-mentioned sky divides the (φ in formula
1i-φ
1j) be the path loss difference of UE1 to two passage group, (φ
2j-φ
2i) be the path loss difference of UE2 to two passage group, path loss difference need to be estimated to obtain.Concerning HSUPA and HSDPA business, be at first to estimate the corresponding received power of following channel to two a passage group, and then ask the difference of received power to obtain path loss difference in above-mentioned formula.
The accuracy of estimation of received power is relevant to signal to noise ratio.Signal to noise ratio is larger, and estimated received power is more accurate; Signal to noise ratio is lower, and namely useful signal is less than noise, is submerged in noise, and estimated received power is bigger than normal, and error is larger.
When the interchannel isolation is larger, UE is larger to the signal to noise ratio of one of them passage group, and it is lower to the signal to noise ratio of another passage group, therefore, the path loss difference of UE to two passage group is in the situation that the larger evaluated error that exists of interchannel isolation is larger, path loss difference is estimated situation bigger than normal, causes empty minute probability lower.It is very large that Fig. 2 shows actual isolation, under the condition that namely signal to noise ratio (CI) is very little, adopts received power estimated value that two kinds of existing received power algorithm for estimating obtain and the comparison diagram of received power ideal value.In Fig. 2, ideal is ideal value, and alphawinner and alpha are existing two kinds of received power algorithm for estimating.As seen from Figure 2, the received power estimated value is bigger than normal than received power ideal value, and error is very large.
An existing empty minute decision method is:
At first judge that each subframe is invalid frame or valid frame.If current subframe user surpasses certain thresholding (as 3db on the noise power basis) at the channel estimation results on this passage (filtering or instantaneous footpath power), judge that this frame is invalid frame; Otherwise judge that this frame is valid frame, carries out the estimation of received power to this frame.
If invalid frame thinks that the path loss difference that correspondence relates to is infinity, can be unconditionally empty minute.
If valid frame, carry out path loss difference according to the estimated result of received power and estimate, and carry out sky minute formula according to the path loss difference estimated result and calculate, judge whether to satisfy sky minute condition.
But according to test and simulation result, there is following problem in an existing empty minute decision method:
In the situation that the interchannel isolation is larger, although the interchannel isolation is larger, can there be the valid frame of some, and will need according to the estimation of received power being calculated path loss difference for valid frame, as previously mentioned, evaluated error is larger in this case, and this will cause empty minute probability on the low side.
And in the situation that the interchannel isolation is less, although the interchannel isolation is less, or can there be the invalid frame of some, owing to for invalid frame being unconditional empty dividing, cause also existing certain sky to divide probability in the situation that the interchannel isolation is less, and in fact the interchannel isolation hour is not satisfy empty minute condition.
Fig. 3 is for adopting two kinds of existing invalid frame decision rules to carry out the comparison diagram as a result of invalid frame judgement.In Fig. 3, a kind of invalid frame decision rule is: if current subframe user surpasses thresholding at the filtering footpath of this passage power, think that namely this frame is invalid frame; Another kind of invalid frame decision rule is: if current subframe user does not surpass thresholding at filtering footpath power or the instantaneous footpath power of this passage, think that this frame is invalid frame.
Another kind of invalid frame decision rule method described in Fig. 3 is based on filtering footpath power and surpasses thresholding or instantaneous footpath power and surpass thresholding and all think invalid frame, judgement is double threshold herein, think that this frame is invalid as long as there is a value not surpass thresholding, so the invalid frame probability is very high, and, very large at actual isolation, under the condition that namely CI is very little, still there is a certain proportion of valid frame.And the described a kind of invalid frame decision rule of Fig. 3 is only to consider that simple gate limit is that filtering footpath power surpasses thresholding, just thinks invalid frame.As seen from Figure 3, even relax Rule of judgment, still there is certain invalid frame probability under the very large condition of CI.
Summary of the invention
The invention provides a kind of method and device that carries out judgement in empty minute, divide the accuracy of judgement to improve sky, thereby the sky that improves in the very large situation of physical channel isolation divides probability, and the sky that reduces in the very little situation of physical channel isolation divides probability.
A kind of method of carrying out judgement in empty minute provided by the invention is used for that two users are carried out sky and minute adjudicates, and will since each frame of N frame as present frame, carry out following operation:
Adopt the invalid frame probability of the front N frame of sliding window method statistic present frame;
If the invalid frame probability of present frame greater than the first probability threshold, carries out sky to described two users and divides;
If the invalid frame probability of present frame is less than the second probability threshold, divide formula to judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky minute, if satisfied, described two users do not carried out sky and divide;
Otherwise, if present frame is invalid frame, described two users is carried out sky and divide; If present frame is valid frame, divide formula to judge that whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky minute, if satisfied, described two users do not carried out sky and divide;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
The method may further include:
Each frame before the N frame as present frame, is carried out following operation:
If present frame is invalid frame, described two users is carried out sky and divide;
If present frame is valid frame, divide formula to judge that whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky minute, if satisfied, described two users do not carried out sky and divide.
A kind of device that carries out judgement in empty minute provided by the invention is used for two users are carried out sky minute judgement, comprising:
The probability calculation module is used for slide the invalid frame probability of the front N frame of window method statistic present frame since each frame employing of N frame;
Empty minute judging module is used for and will carries out following operation as present frame since each frame of N frame:
, be used for that described two users are carried out sky and divide during greater than the first probability threshold at the invalid frame probability of present frame;
, be used for dividing formula judge whether described two users satisfy empty minute condition according to sky during less than the second probability threshold at the invalid frame probability of present frame, if satisfy, described two users carried out sky divide, if satisfied, described two users do not carried out sky and divide;
At the invalid frame probability of present frame during less than or equal to the first probability threshold and more than or equal to the second probability threshold, be used for judging whether present frame is invalid frame, when present frame is invalid frame, be used for that described two users are carried out sky and divide, when present frame is valid frame, be used for dividing formula to judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky divide, if do not satisfy, described two users are not carried out sky and divide;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
Preferably, described sky divides judging module, can also be used for each frame before the N frame carrying out following operation as present frame:
When present frame is invalid frame, is used for that described two users are carried out sky and divides;
When present frame is valid frame, be used for dividing formula judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky divide, if satisfied, described two users do not carried out sky and divide.
As seen from the above technical solution, the present invention introduces sliding window the invalid frame probability of the front N frame of every frame is calculated by dividing at sky in judgement, and carry out sky minute judgement according to the probability that calculates, improved the accuracy of judgement in empty minute, thereby the sky that has improved in the very large situation of physical channel isolation divides probability, and the sky that has reduced in the very little situation of physical channel isolation divides probability.
Description of drawings
Fig. 1 is that two users' sky divides schematic diagram;
Fig. 2 is under the very large condition of actual isolation, the contrast schematic diagram of received power estimated value and ideal value;
Fig. 3 is for adopting two kinds of existing invalid frame decision rules to carry out the comparison diagram as a result of invalid frame judgement;
Fig. 4 is the schematic diagram of the invalid frame probability of the present invention's front N frame of adopting the every frame of sliding window method statistic;
Fig. 5 is that the sky of the present invention and prior art divides the court verdict comparison diagram;
Fig. 6 is the better composition structural representation that carries out the device of judgement in empty minute of the present invention one.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The present invention divides in judgement at sky and introduces sliding window the invalid frame probability of the front N frame of every frame is calculated, and carries out sky according to the probability that calculates and minute adjudicate.Wherein, N is sliding window length.
The method that the present invention carries out judgement in empty minute specifically comprises the following steps:
The 1st goes on foot: adopt an existing empty minute decision method to determine whether that carrying out sky divides to front N-1 frame.
That is to say, for front N-1 frame, judge that at first each subframe is invalid frame or valid frame.If current subframe user surpasses certain thresholding (as 3db on the noise power basis) at the channel estimation results on this passage (filtering or instantaneous footpath power), judge that this frame is invalid frame; Otherwise judge that this frame is valid frame, carries out the estimation of received power to this frame.
If be invalid frame, think that the path loss difference that correspondence relates to is infinity, can be unconditionally empty minute.
If valid frame divides formula to judge whether to satisfy empty minute condition according to sky, that is: need to carry out according to the estimated result of received power path loss difference and estimate, and carry out sky minute formula according to the path loss difference estimated result and calculate, judge whether to satisfy empty minute condition.
The 2nd step: since the N frame, adopt the invalid frame probability of the front N frame of the every frame of sliding window method statistic, as shown in Figure 4.
If the invalid frame probability thinks that greater than certain probability threshold Pth_high (as 0.7) the interchannel isolation is larger, judgement can be unconditionally empty minute;
If the invalid frame probability is less than certain probability threshold Pth_low (as 0.2), think that the interchannel isolation is very little, divide formula to judge whether to satisfy empty minute condition according to sky, that is: need to carry out according to the estimated result of received power path loss difference estimates, and carry out sky minute formula according to the path loss difference estimated result and calculate, judge whether to satisfy empty minute condition;
If the invalid frame probability between Pth_high (as 0.7) and Pth_low (as 0.2), thinks that the interchannel isolation is not greatly or minimum, need to carry out sky in conjunction with invalid frame court verdict and an empty minute formula and minute adjudicate.Particularly:
If be invalid frame, think that the path loss difference that correspondence relates to is infinity, can be unconditionally empty minute.
If valid frame divides formula to judge whether to satisfy empty minute condition according to sky, that is: need to carry out according to the estimated result of received power path loss difference and estimate, and carry out sky minute formula according to the path loss difference estimated result and calculate, judge whether to satisfy empty minute condition.
Fig. 5 is that the sky of the present invention and prior art divides the court verdict comparison diagram.The simulated conditions of Fig. 5 is:
Under indoor 3km/h environment, sliding window length is 100.If the signal to noise ratio (CI) of passage group i is-3db, the isolation of passage group j and passage group i differs and reaches that thinks more than 22db can empty minute, when namely the signal to noise ratio of passage group j (CI) is lower than-25db, can with empty minute of passage group i, use same asset.
In Fig. 5, new scheme curve is to adopt the empty minute decision rule of the present invention and be not over thresholding the sky that the invalid frame decision rule of invalid frame obtains based on filtering footpath power to divide probability curve; The LCR60scheme curve be adopt existing the invalid frame sky of unconditional empty minute is divided decision rule and is not over thresholding the sky that the invalid frame decision rule of invalid frame obtains based on filtering or instantaneous footpath power divide probability curve.As seen from Figure 5, adopt technical solution of the present invention, very large at actual isolation, under the condition that namely CI is very little, empty minute probability is near 100%; Very little at actual isolation, under the condition that namely CI is very large, empty minute probability is near 0, and as seen, the accuracy of judgement in empty minute is higher, can obtain air separation preferably.
Corresponding to said method, the present invention also provides the device of a kind of carrying out as shown in Figure 6 judgement in empty minute, and this device is used for two users are carried out sky minute judgement, comprising: probability calculation module 610 and empty minute judging module 620, wherein:
Empty minute judging module 620 is used for and will carries out following operation as present frame since each frame of N frame:
, be used for that described two users are carried out sky and divide during greater than the first probability threshold at the invalid frame probability of present frame;
, be used for dividing formula judge whether described two users satisfy empty minute condition according to sky during less than the second probability threshold at the invalid frame probability of present frame, if satisfy, described two users carried out sky divide, if satisfied, described two users do not carried out sky and divide;
At the invalid frame probability of present frame during less than or equal to the first probability threshold and more than or equal to the second probability threshold, be used for judging whether present frame is invalid frame, when present frame is invalid frame, be used for that described two users are carried out sky and divide, when present frame is valid frame, be used for dividing formula to judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky divide, if do not satisfy, described two users are not carried out sky and divide;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
Preferably, the sky in device shown in Figure 6 divides judging module 620, also is used for each frame before the N frame carrying out following operation as present frame:
When present frame is invalid frame, is used for that described two users are carried out sky and divides;
When present frame is valid frame, be used for dividing formula judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky divide, if satisfied, described two users do not carried out sky and divide.
As seen from the above-described embodiment, the present invention introduces sliding window the invalid frame probability of the front N frame of every frame is calculated by dividing at sky in judgement, and carry out sky minute judgement according to the probability that calculates, improved the accuracy of judgement in empty minute, thereby the sky that has improved in the very large situation of physical channel isolation divides probability, and the sky that has reduced in the very little situation of physical channel isolation divides probability.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (4)
1. method of carrying out judgement in empty minute is used for that two users are carried out sky and minute adjudicates, and it is characterized in that, will since each frame of N frame as present frame, carry out following operation:
Adopt the invalid frame probability of the front N frame of sliding window method statistic present frame;
If the invalid frame probability of present frame greater than the first probability threshold, carries out sky to described two users and divides;
If the invalid frame probability of present frame is less than the second probability threshold, divide formula to judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky minute, if satisfied, described two users do not carried out sky and divide;
Otherwise, if present frame is invalid frame, described two users is carried out sky and divide; If present frame is valid frame, divide formula to judge that whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky minute, if satisfied, described two users do not carried out sky and divide;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
2. method according to claim 1, is characterized in that, the method further comprises:
Each frame before the N frame as present frame, is carried out following operation:
If present frame is invalid frame, described two users is carried out sky and divide;
If present frame is valid frame, divide formula to judge that whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky minute, if satisfied, described two users do not carried out sky and divide.
3. a device that carries out judgement in empty minute, be used for two users are carried out sky minute judgement, it is characterized in that, comprising:
The probability calculation module is used for slide the invalid frame probability of the front N frame of window method statistic present frame since each frame employing of N frame;
Empty minute judging module is used for and will carries out following operation as present frame since each frame of N frame:
, be used for that described two users are carried out sky and divide during greater than the first probability threshold at the invalid frame probability of present frame;
, be used for dividing formula judge whether described two users satisfy empty minute condition according to sky during less than the second probability threshold at the invalid frame probability of present frame, if satisfy, described two users carried out sky divide, if satisfied, described two users do not carried out sky and divide;
At the invalid frame probability of present frame during less than or equal to the first probability threshold and more than or equal to the second probability threshold, be used for judging whether present frame is invalid frame, when present frame is invalid frame, be used for that described two users are carried out sky and divide, when present frame is valid frame, be used for dividing formula to judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky divide, if do not satisfy, described two users are not carried out sky and divide;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
4. device according to claim 3 is characterized in that:
Described sky divides judging module, also is used for each frame before the N frame carrying out following operation as present frame:
When present frame is invalid frame, is used for that described two users are carried out sky and divides;
When present frame is valid frame, be used for dividing formula judge whether described two users satisfy empty minute condition according to sky, if satisfy, described two users are carried out sky divide, if satisfied, described two users do not carried out sky and divide.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040086027A1 (en) * | 2002-10-31 | 2004-05-06 | Shattil Steve J. | Orthogonal superposition coding for direct-sequence communications |
| WO2008044204A2 (en) * | 2006-10-12 | 2008-04-17 | Nxp B.V. | Selection scheme for selecting a peak in a correlati0n signal |
| CN101800571A (en) * | 2009-02-06 | 2010-08-11 | 大唐移动通信设备有限公司 | Method, system and device for treating data in high-speed packet access evolution system |
| CN102104949A (en) * | 2009-12-21 | 2011-06-22 | 大唐移动通信设备有限公司 | Space division method, system and equipment for dedicated physical channel (DPCH) |
| CN102104944A (en) * | 2009-12-17 | 2011-06-22 | 电信科学技术研究院 | Space division judgment method and base station |
-
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- 2011-11-17 CN CN201110365282.1A patent/CN103118430B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040086027A1 (en) * | 2002-10-31 | 2004-05-06 | Shattil Steve J. | Orthogonal superposition coding for direct-sequence communications |
| WO2008044204A2 (en) * | 2006-10-12 | 2008-04-17 | Nxp B.V. | Selection scheme for selecting a peak in a correlati0n signal |
| CN101800571A (en) * | 2009-02-06 | 2010-08-11 | 大唐移动通信设备有限公司 | Method, system and device for treating data in high-speed packet access evolution system |
| CN102104944A (en) * | 2009-12-17 | 2011-06-22 | 电信科学技术研究院 | Space division judgment method and base station |
| CN102104949A (en) * | 2009-12-21 | 2011-06-22 | 大唐移动通信设备有限公司 | Space division method, system and equipment for dedicated physical channel (DPCH) |
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