CN103118430B - Method and device of space division decision - Google Patents
Method and device of space division decision Download PDFInfo
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- CN103118430B CN103118430B CN201110365282.1A CN201110365282A CN103118430B CN 103118430 B CN103118430 B CN 103118430B CN 201110365282 A CN201110365282 A CN 201110365282A CN 103118430 B CN103118430 B CN 103118430B
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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 mobile communication technology field, particularly a kind of method and device carrying out empty point of judgement.
Background technology
Under indoor environment, if two interchannel isolations are very large, then can think that the interference between two users is very little, meet empty point condition, these two users can use identical ascending resource (such as: simultaneously dispatch the HSUPA user that two use same asset) or downlink resource (such as: simultaneously dispatch the HSDPA user that two use same asset).
Fig. 1 is that the sky of two users divides schematic diagram.Fig. 1 is divided into example with up HSUPA sky, wherein:
UE1 and UE2 represents two users respectively;
I is the strongest channel group number of UE1, and j is the strongest channel group number of UE2;
M is the number of active lanes in the strongest passage group of UE1, and N is the number of active lanes in 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) signal strength signal intensity-UE2 after UE1 despreading is to the demodulation threshold of the interference > UE1 of UE1;
(2) signal strength signal intensity-UE1 after UE2 despreading is to the demodulation threshold of the interference > UE2 of UE2.
That is:
(1) (transmitting power-φ of UE1
1i+ antenna gain+spreading gain)-(transmitting power-φ of UE2
2i) demodulation threshold of > UE1;
(2) (transmitting power-φ of UE2
2j+ antenna gain+spreading gain)-(transmitting power-φ of UE1
1j) demodulation threshold of > UE2.
The transmitting power of UE equals received power+path loss, and therefore, two formula above can be transformed to:
(1) (UE1 is at the received power+antenna gain+spreading gain of passage group i)-(received power+φ of UE2 to passage group j
2j-φ
2i) demodulation threshold of > UE1
(2) (UE2 is at the received power+antenna gain+spreading gain of passage group j)-(received power+φ of UE1 to passage group i
1i-φ
1j) demodulation threshold of > UE2
Above-mentioned two formula are called empty point formula.Above-mentioned sky divides the (φ in formula
1i-φ
1j) for UE1 is to the path loss difference of two passage groups, (φ
2j-φ
2i) for UE2 is to the path loss difference of two passage groups, path loss difference needs estimation to obtain.Concerning HSUPA and HSDPA business, be first estimate the received power of corresponding adjoint channel to two passage groups, and then the path loss difference asking the difference of received power to obtain 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 compared to noise, is submerged in noise, and estimated received power is bigger than normal, and error is larger.
When 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, it is larger to there is evaluated error to the path loss difference of two passage groups when interchannel isolation is larger in UE, path loss difference estimates situation bigger than normal, causes empty point 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, and the received power estimated value adopting two kinds of existing received power algorithm for estimating to obtain and the comparison diagram of received power ideal value.In Fig. 2, ideal is ideal value, alphawinner and alpha is existing two kinds of received power algorithm for estimating.As seen from Figure 2, received power estimated value is bigger than normal than received power ideal value, and error is very large.
Existing sky divides decision method to be:
First judge that each subframe is invalid frame or valid frame.If the channel estimation results of present sub-frame user on this passage (filtering or instantaneous footpath power) does not exceed certain thresholding (as 3db on noise power basis), then judge that this frame is as invalid frame; Otherwise judge that this frame is as valid frame, carries out the estimation of received power to this frame.
If invalid frame, think that the path loss difference that correspondence relates to is infinity, can unconditionally empty point.
If valid frame, the estimated result according to received power carries out path loss difference estimation, and carries out sky point formulae discovery according to path loss difference estimated result, judges whether to meet empty point condition.
But according to testing and emulation result, existing sky divides decision method to there is following problem:
When interchannel isolation is larger, although interchannel isolation is comparatively large, the valid frame of some can be there is, and will need according to the estimation of received power being calculated to path loss difference for valid frame, as previously mentioned, evaluated error is comparatively large in this case, and this will cause empty point probability on the low side.
And when interchannel isolation is less, although interchannel isolation is less, or the invalid frame of some can be there is, owing to for invalid frame being unconditional sky point, cause also dividing probability by there is certain sky when interchannel isolation is less, and be do not meet empty point condition when in fact interchannel isolation is less.
Fig. 3 is the Comparative result figure that invalid frame judgement is carried out in the existing invalid frame decision rule of employing two kinds.In Fig. 3, a kind of invalid frame decision rule is: if present sub-frame user does not exceed thresholding at the filtering footpath power of this passage, namely think that this frame is invalid frame; Another kind of invalid frame decision rule is: if present sub-frame user does not exceed thresholding at the filtering footpath power of this passage or instantaneous footpath power, then think that this frame is invalid frame.
Another kind of invalid frame decision rule method described in Fig. 3 does not exceed thresholding or instantaneous footpath power based on filtering footpath power not exceed thresholding and all think invalid frame, judge it is double threshold herein, as long as have a value not exceed thresholding then think that this frame is invalid, so 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 a kind of invalid frame decision rule described in Fig. 3 only considers that simple gate limit and filtering footpath power do not exceed thresholding, just think invalid frame.As seen from Figure 3, even if relax Rule of judgment, under the condition that CI is very large, still there is certain invalid frame probability.
Summary of the invention
The invention provides a kind of method and the device that carry out empty point of judgement, to improve the accuracy of empty point of judgement, thus the sky improved in the very large situation of physical channel isolation divides probability, and the sky reduced in the very little situation of physical channel isolation divides probability.
A kind of method of carrying out empty point of judgement provided by the invention, for carrying out sky point judgement to two users, using each frame from N frame as present frame, performs and operates as follows:
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 is greater than the first probability threshold, then sky point is carried out to described two users;
If the invalid frame probability of present frame is less than the second probability threshold, then whether described two users meet empty point condition to divide formula to judge according to sky, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users;
Otherwise, if present frame is invalid frame, then sky point is carried out to described two users; If present frame is valid frame, then whether described two users meet empty point condition to divide formula to judge according to sky, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
The method may further include:
Using each frame before N frame as present frame, perform and operate as follows:
If present frame is invalid frame, then sky point is carried out to described two users;
If present frame is valid frame, then whether described two users meet empty point condition to divide formula to judge according to sky, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users.
A kind of device carrying out empty point of judgement provided by the invention, for carrying out sky point judgement to two users, comprising:
Probability evaluation entity, for the invalid frame probability to N frame before each frame employing sliding window method statistic present frame from N frame;
Empty point judging module, for each frame from N frame is performed following operation as present frame:
When the invalid frame probability of present frame is greater than the first probability threshold, for carrying out sky point to described two users;
When the invalid frame probability of present frame is less than the second probability threshold, judge that for dividing formula according to sky whether described two users meet empty point condition, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users;
When the invalid frame probability of present frame is less than or equal to the first probability threshold and is more than or equal to the second probability threshold, for judging whether present frame is invalid frame, when present frame is invalid frame, for carrying out sky point to described two users, when present frame is valid frame, judge for dividing formula according to sky whether described two users meet empty point condition, if met, sky point is carried out to described two users, if do not met, sky point is not carried out to described two users;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
Preferably, described sky divides judging module, and each frame before can also being used for N frame, as present frame, performs and operates as follows:
When present frame is invalid frame, for carrying out sky point to described two users;
When present frame is valid frame, judge that for dividing formula according to sky whether described two users meet empty point condition, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users.
As seen from the above technical solution, the present invention calculates the invalid frame probability of N frame before every frame by dividing the sliding window of introducing in judgement at sky, and carry out sky point judgement according to the probability calculated, improve the accuracy of empty point of judgement, thus the sky that improve in the very large situation of physical channel isolation divides probability, and the sky reduced in the very little situation of physical channel isolation divides probability.
Accompanying drawing explanation
Fig. 1 is that the sky of two users divides schematic diagram;
Fig. 2 is under the condition that actual isolation is very large, the contrast schematic diagram of received power estimated value and ideal value;
Fig. 3 is the Comparative result figure that invalid frame judgement is carried out in the existing invalid frame decision rule of employing two kinds;
Fig. 4 is the schematic diagram that the present invention adopts the invalid frame probability of the front N frame of the every frame of sliding window method statistic;
Fig. 5 is that the sky of the present invention and prior art divides court verdict comparison diagram;
Fig. 6 is the better composition structural representation carrying out the device of empty point of judgement of the present invention one.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further detail.
The invalid frame probability of the present invention's N frame before sky divides the sliding window of introducing in judgement to every frame calculates, and carries out sky point judgement according to the probability calculated.Wherein, N is sliding window length.
The method that the present invention carries out empty point of judgement specifically comprises the following steps:
1st step: adopt existing sky to divide decision method to determine whether to carry out sky point to front N-1 frame.
That is, for front N-1 frame, first judge that each subframe is invalid frame or valid frame.If the channel estimation results of present sub-frame user on this passage (filtering or instantaneous footpath power) does not exceed certain thresholding (as 3db on noise power basis), then judge that this frame is as invalid frame; Otherwise judge that this frame is as valid frame, carries out the estimation of received power to this frame.
If be invalid frame, then think that the path loss difference that correspondence relates to is infinity, can unconditionally empty point.
If valid frame, then divide formula to judge whether to meet empty point condition according to sky, that is: need to carry out path loss difference estimation according to the estimated result of received power, and carry out sky point formulae discovery according to path loss difference estimated result, judge whether to meet empty point condition.
2nd step: from N frame, adopts the invalid frame probability of the front N frame of the every frame of sliding window method statistic, as shown in Figure 4.
If invalid frame probability is greater than certain probability threshold Pth_high (as 0.7), think that interchannel isolation is comparatively large, judgement can unconditionally empty point;
If invalid frame probability is less than certain probability threshold Pth_low (as 0.2), think that interchannel isolation is very little, then formula is divided to judge whether to meet empty point condition according to sky, that is: need to carry out path loss difference estimation according to the estimated result of received power, and carry out sky point formulae discovery according to path loss difference estimated result, judge whether to meet empty point condition;
If invalid frame probability is between Pth_high (as 0.7) and Pth_low (as 0.2), think that interchannel isolation is not very big or minimum, need to carry out sky point judgement in conjunction with invalid frame court verdict and an empty point formula.Particularly:
If be invalid frame, then think that the path loss difference that correspondence relates to is infinity, can unconditionally empty point.
If valid frame, then divide formula to judge whether to meet empty point condition according to sky, that is: need to carry out path loss difference estimation according to the estimated result of received power, and carry out sky point formulae discovery according to path loss difference estimated result, judge whether to meet empty point condition.
Fig. 5 is that the sky of the present invention and prior art divides 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 of passage group i (CI) is-3db, passage group j differ with the isolation of passage group i reach that more than 22db thinks can empty point, namely, when the signal to noise ratio (CI) of passage group j is lower than-25db, can divides with passage group i sky, use same asset.
In Fig. 5, new scheme curve adopts the present invention's sky point decision rule and do not exceed based on filtering footpath power the sky that invalid frame decision rule that thresholding is invalid frame obtains to divide probability curve; LCR60scheme curve adopts the existing sky to unconditional empty point of invalid frame to divide decision rule and do not exceed based on filtering or instantaneous footpath power the sky that invalid frame decision rule that thresholding is invalid frame obtains to 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 point probability is close to 100%; Very little at actual isolation, under the condition that namely CI is very large, empty point probability is close to 0, visible, and the accuracy of empty point of judgement is higher, can obtain good air separation.
Corresponding to said method, the present invention also provides a kind of device of carrying out sky point judgement as shown in Figure 6, and this device is used for carrying out sky point judgement to two users, comprising: probability evaluation entity 610 and empty point judging module 620, wherein:
Probability evaluation entity 610, for the invalid frame probability to N frame before each frame employing sliding window method statistic present frame from N frame;
Empty point judging module 620, for each frame from N frame is performed following operation as present frame:
When the invalid frame probability of present frame is greater than the first probability threshold, for carrying out sky point to described two users;
When the invalid frame probability of present frame is less than the second probability threshold, judge that for dividing formula according to sky whether described two users meet empty point condition, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users;
When the invalid frame probability of present frame is less than or equal to the first probability threshold and is more than or equal to the second probability threshold, for judging whether present frame is invalid frame, when present frame is invalid frame, for carrying out sky point to described two users, when present frame is valid frame, judge for dividing formula according to sky whether described two users meet empty point condition, if met, sky point is carried out to described two users, if do not met, sky point is not carried out to described two users;
Wherein, N is sliding window length, and the first probability threshold is greater than the second probability threshold.
Preferably, the sky in Fig. 6 shown device divides judging module 620, also for using each frame before N frame as present frame, perform as follows operate:
When present frame is invalid frame, for carrying out sky point to described two users;
When present frame is valid frame, judge that for dividing formula according to sky whether described two users meet empty point condition, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users.
As seen from the above-described embodiment, the present invention calculates the invalid frame probability of N frame before every frame by dividing the sliding window of introducing in judgement at sky, and carry out sky point judgement according to the probability calculated, improve the accuracy of empty point of judgement, thus the sky that improve in the very large situation of physical channel isolation divides probability, and the sky reduced in the very little situation of physical channel isolation divides probability.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (4)
1. carry out a method for empty point of judgement, for carrying out sky point judgement to two users, it is characterized in that, using each frame from N frame as present frame, perform and operate as follows:
Adopt the invalid frame probability of the front N frame of sliding window method statistic present frame;
If the invalid frame probability of the front N frame of present frame is greater than the first probability threshold, then sky point is carried out to described two users;
If the invalid frame probability of the front N frame of present frame is less than the second probability threshold, whether described two users meet empty point condition then to divide formula to judge according to sky, if met, carry out sky point to described two users, if do not met, sky point is not carried out to described two users;
Otherwise, if present frame is invalid frame, then sky point is carried out to described two users; If present frame is valid frame, then whether described two users meet empty point condition to divide formula to judge according to sky, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users;
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 comprises further:
Using each frame before N frame as present frame, perform and operate as follows:
If present frame is invalid frame, then sky point is carried out to described two users;
If present frame is valid frame, then whether described two users meet empty point condition to divide formula to judge according to sky, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users.
3. carry out a device for empty point of judgement, for carrying out sky point judgement to two users, it is characterized in that, comprising:
Probability evaluation entity, for the invalid frame probability to N frame before each frame employing sliding window method statistic present frame from N frame;
Empty point judging module, for each frame from N frame is performed following operation as present frame:
When before present frame, the invalid frame probability of N frame is greater than the first probability threshold, for carrying out sky point to described two users;
When before present frame, the invalid frame probability of N frame is less than the second probability threshold, judge that for dividing formula according to sky whether described two users meet empty point condition, if met, carry out sky point to described two users, if do not met, sky point is not carried out to described two users;
When the invalid frame probability of present frame is less than or equal to the first probability threshold and is more than or equal to the second probability threshold, for judging whether present frame is invalid frame, when present frame is invalid frame, for carrying out sky point to described two users, when present frame is valid frame, judge for dividing formula according to sky whether described two users meet empty point condition, if met, sky point is carried out to described two users, if do not met, sky point is not carried out to described two users;
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 for using each frame before N frame as present frame, perform as follows operate:
When present frame is invalid frame, for carrying out sky point to described two users;
When present frame is valid frame, judge that for dividing formula according to sky whether described two users meet empty point condition, if met, carry out sky point to described two users, if do not met, do not carry out sky point to described two users.
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|---|---|---|---|
| CN201110365282.1A CN103118430B (en) | 2011-11-17 | 2011-11-17 | Method and device of space division decision |
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|---|---|---|---|
| CN201110365282.1A CN103118430B (en) | 2011-11-17 | 2011-11-17 | Method and device of space division decision |
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| CN103118430B true CN103118430B (en) | 2015-05-27 |
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| US7317750B2 (en) * | 2002-10-31 | 2008-01-08 | Lot 41 Acquisition Foundation, Llc | Orthogonal superposition coding for direct-sequence communications |
| US20100142657A1 (en) * | 2006-10-12 | 2010-06-10 | Eric Alliot | Selection scheme for selecting a peak in a correlation signal |
| CN101800571B (en) * | 2009-02-06 | 2013-05-15 | 电信科学技术研究院 | Method, system and device for treating data in high-speed packet access evolution system |
| CN102104944B (en) * | 2009-12-17 | 2013-08-14 | 电信科学技术研究院 | Space division judgment method and base station |
| CN102104949B (en) * | 2009-12-21 | 2013-11-06 | 电信科学技术研究院 | Space division method, system and equipment for dedicated physical channel (DPCH) |
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