CN103369655A - Method for improving LTE PUCCH DTX detection performance - Google Patents

Abstract

The invention provides a method for improving LTE PUCCH DTX detection performance. The method includes the steps that firstly NI flattening treatment among time slots and antennas is conducted on UE equilibrium demodulation data, then DTX detection and PUCCH demodulation treatment is conducted. After the scheme is used, under the scene with the large NI difference, the performance of simulation environment and implementation environment is greatly improved; under the scene with small NI difference, the performance of the simulation environment and the implementation environment is not lost, comprehensively, on the premise that the false-alarm probability reaches the standard, the miss-alarm probability of a PUCCH is greatly lowered, therefore, the wireless performance of the PUCCH is improved, and then the throughput performance of a whole LTE system is improved.

Description

A kind of method that improves LTE PUCCH DTX detection performance

Technical field

The present invention relates to the wireless performance lift technique field in the wireless communication system, be specifically related to the method that a kind of LTE of raising PUCCH DTX detects performance.

Background technology

LTE is subject to the favor of Mobile Communication Industry always.Along with the development of LTE technology, increasing world-leading operator faces the future LTE one after another as network evolution direction, equipment manufacturers have also strengthened the input in the LTE field one after another, thereby have promoted constantly advancing of LTE.Compare with 3G (3rd Generation), LTE has following technical characterictic: (1) reduces every bit cost, improves the uplink and downlink communication data rate; (2) spectrum efficiency improves, and uses flexibly existing and new frequency range; (3) QoS (Quality of Service) guarantees, the providing capability of activating business is experienced the more business that provides with lower cost, better user; (4) reduce the wireless network time delay, simplify framework, open interface; (5) increase the cell edge bit rate, in the situation that keep the constant increase of present base station location cell edge bit rate etc.

LTE PUCCH carries ascending control information UCI (Uplink Control Information), specifically comprises CQI (Channel Quality Indication) information, HARQ (Hybrid Automatic Repeat Quest) confirmation, reaches SR (Schedule Request) information etc.We know, the movement of wireless channel Multipath Transmission, terminal UE and the different spatial of antenna will inevitably cause respectively frequency selective fading, time selective fading and the space selective fading of wireless channel, so, the improvement of PUCCH performance must take into full account these declines.

The purpose that the DTX of PUCCH detects, the base station mistake is gone to detect and is brought " false-alarm " in order to prevent UE from not launching UCI information, obviously improve the thresholding that DTX detects, can better suppress " false-alarm ", reduce " false-alarm " probability, but thresholding is higher, " false dismissal " probability is higher, be that UE has launched UCI information, but demodulation is not missed because cross the DTX thresholding in the base station.Therefore, how under the probability that guarantees " false-alarm ", the reduce thresholding, thus guarantee that it is the sole criterion of weighing the DTX detection algorithm that false dismissal is tried one's best little.

PUCCH agreement from LTE, PUCCH certainly exists frequency hopping between time slot, and obviously purpose of design is exactly in order to obtain frequency diversity gain like this, exactly in order to promote the PUCCH demodulation performance under uneven interference the between time slot; For PUCCH part UCI content, between different time-gap, transmit respectively identical content, this also is for the acquisition time diversity gain, the purpose of resistance time selectivity decline; The PUCCH demodulation performance will be expected maximum lifting so, not only will consider above each dimension, and will weighting merge (it is optimum scarcely that equal proportion merges) on each dimension; This patent is mentioned carries out first NI between time slot, between antenna to data before the equalizing demodulation and evens up and process and then carry out that PUCCH DTX detects and the method for demodulation process, is exactly that weighting on each dimension merges processing in fact.

Merge the direct merging of adopting between time slot, between antenna based on present PUCCH demodulation, i.e. the present situation that merges of equal proportion can't significantly promote the wireless performance of PUCCH channel.

Summary of the invention

The object of the invention is to overcome deficiency of the prior art, the NI that provides a kind of method that UE equalizing demodulation data are carried out between time slot, between antenna first evens up processing, and then carries out DTX and detect and the PUCCH demodulation process; After using the present invention program, under NI differed greatly scene, emulation and realization environment had all been seen very large performance gain; Under the less scene of NI difference, emulation and realization environmental performance guarantee not lose, comprehensively see and guaranteeing under " false-alarm " probability prerequisite up to standard, greatly reduce " false dismissal " probability of PUCCH, thereby promoted the wireless performance of PUCCH channel, and then promoted the throughput performance of whole LTE system.

Solving the problems of the technologies described above the technical scheme that adopts is comprised of following steps:

1, calculate respectively the NI power of all UE on different time-gap, different antennae, meter is made P _n(slot _i, ant _j), i=0 wherein, 1; J=0,1 ..., M-1; M is receiving end antenna for base station number.

2, putting user index Index_User is 1, namely from first UE, calculates the DTX of each UE after NI evens up processing by this programme and detects performance and PUCCH data demodulates performance.

3, calculate current UE and calculate all P in the first step of correspondence _nMinimum value in the value is designated as P _n_ min.

4, calculate the current UE different time-gap, NI corresponding to different antennae data evens up weighted factor, computational methods are for to calculate by following formula:

$\mathrm{div}({\mathrm{slot}}_i,{\mathrm{ant}}_j)=\mathrm{sqrt}\left(\frac{P_n\_\min }{P_n({\mathrm{slot}}_i,{\mathrm{ant}}_j)}\right)$

5, to channel estimation value corresponding to current UE different time-gap, different antennae and demodulating data respectively with the above-mentioned div (slot that calculates _i, ant _j) the weighting equilibrium, namely carry out corresponding NI and even up processing.

6, channel estimation value and demodulating data after above-mentioned NI evens up are sent into power computation module, obtain current UE and carry out DTX and adjudicate needed signal power and noise power, and then obtain DTX judgement required signal-to-noise ratio.

7: send into the DTX judging module, carry out the DTX judgement of current UE.

8, the current UE corresponding data of crossing the DTX thresholding after the DTX judgement is carried out equilibrium and merge, the data balancing merging of namely carrying out between time slot, between antenna is processed.

9, judge whether all UE have all traveled through complete, in this way, go to step 11.

10, current UE index Index_User adds 1, goes to step 3.

11, return (sending into the processing modules such as follow-up data demodulating and decoding).

The beneficial effect that the present invention brings is: under NI differed greatly scene, emulation and realization environment had all been seen very large demodulation performance gain; Under the less scene of NI difference, emulation and realization environment demodulation performance guarantee not lose; In addition, behind use the present invention program, PUCCH DTX detection threshold remains unchanged under different scenes, thereby the DTX that has greatly promoted PUCCH detects performance; Therefore use behind the present invention program when NI differs greatly greatly elevator system wireless performance.

Description of drawings

Fig. 1 is the present invention program's overall process flow schematic diagram.

Fig. 2 is the DTX judgement schematic flow sheet of the present invention program's current UE.

Embodiment

The present invention is described in more detail below in conjunction with drawings and Examples, but invention is not limited to these embodiment.

Embodiment 1

Referring to Fig. 1, the method step of the present embodiment raising LTE PUCCH DTX detection performance is as follows:

The first step, initialization (step 11) calculates respectively the NI power (step 12) of all UE on different time-gap, different antennae, and meter is made P _n(slot _i, ant _j), i=0 wherein, 1; J=0,1 ..., M-1; M is receiving end antenna for base station number; Computing formula is simply schematically as follows:

Power_Win _ant(t,s,c)＝|win _ant(t,s,c)| ²

$P_{\mathrm{slot}0}=\underset{\mathrm{ant}}{\mathrm{\Σ}}\underset{s_{\mathrm{pilot}}}{\mathrm{\Σ}}\mathrm{Power}\_{\mathrm{Win}}_{\mathrm{ant}}({0,s}_{\mathrm{pilot}},c)+\underset{\mathrm{ant}}{\mathrm{\Σ}}\underset{s_{\mathrm{data}}}{\mathrm{\Σ}}\mathrm{Power}\_{\mathrm{Win}}_{\mathrm{ant}}({0,s}_{\mathrm{data}},c)$

Frequently, data symbol, c represents the corresponding cyclic shift value of passage that all UE do not use, P _n(slot _i, ant _j) i slot of expression, the NI power on the j root antenna goes to second step;

Second step, putting user index Index_User is 1 (step 13 namely from first UE, calculates the DTX of each UE after NI evens up processing by this programme and detects performance and PU CCH data demodulates performance), goes to for the 3rd step;

In the 3rd step, calculate current UE and calculate all P in the first step of correspondence _nMinimum value (step 14) in the value is designated as P _n_ min, i.e. P _n_ min=min (P _n(slot _i, ant _j)), went to for the 4th step;

The 4th step calculated the current UE different time-gap, NI corresponding to different antennae data evens up weighted factor (step 15), calculated by following formula:

$\mathrm{div}({\mathrm{slot}}_i,{\mathrm{ant}}_j)=\mathrm{sqrt}\left(\frac{P_n\_\min }{P_n({\mathrm{slot}}_i,{\mathrm{ant}}_j)}\right)$

Consider the bit wide requirement to realizing, with P _n_ min went to for the 5th step as the benchmark of evening up that NI evens up scheme;

The 5th step, to channel estimation value corresponding to current UE different time-gap, different antennae and demodulating data respectively with the above-mentioned div (slot that calculates _i, ant _j) the weighting equilibrium, namely carry out corresponding NI and even up processing, (step 16) namely has:

H(slot _i,ant _j)=H(slot _i,ant _j).*div(slot _i，ant _j)

d0(slot _i,ant _j)=d0(slot _i,ant _j).*div(slot _i,ant _j)

H (slot wherein _i, ant _j), d0 (slot _i, ant _j) channel estimation value and the receive data of the corresponding current UE of difference on i slot, j root antenna, went to for the 6th step;

The 6th step, channel estimation value and demodulating data after above-mentioned NI evens up are sent into power computation module, obtaining current UE carries out DTX and adjudicates needed signal power and noise power, and then obtain DTX judgement required signal-to-noise ratio (step 17), its signal power computing formula simply schematically as follows:

Power_Win _ant(t,s,c)=|Win _ant(t,s,c)| ²

$P_{\mathrm{slot}0}=\underset{\mathrm{ant}}{\mathrm{\Σ}}\underset{s_{\mathrm{pilot}}}{\mathrm{\Σ}}\mathrm{Power}\_\mathrm{Wi}{n}_{\mathrm{ant}}(0,s_{\mathrm{pilot}},c)+\underset{\mathrm{ant}}{\mathrm{\Σ}}\underset{s_{\mathrm{data}}}{\mathrm{\Σ}}\mathrm{Power}\_{\mathrm{Win}}_{\mathrm{ant}}({0,s}_{\mathrm{data}},c)$

$P_{\mathrm{slot}1}=\underset{\mathrm{ant}}{\mathrm{\Σ}}\underset{s_{\mathrm{pilot}}}{\mathrm{\Σ}}\mathrm{Power}\_{\mathrm{Win}}_{\mathrm{ant}}(1,s_{\mathrm{pilot}},c)+\underset{\mathrm{ant}}{\mathrm{\Σ}}\underset{s_{\mathrm{data}}}{\mathrm{\Σ}}\mathrm{Power}\_{\mathrm{Win}}_{\mathrm{ant}}(1,s_{\mathrm{data}},c)$

Wherein, Win _Ant(t, s, c) corresponding current UE receives signal window (comprising data, pilot tone window), s _Pilot, s _DataRepresent respectively current time slots pilot tone, data symbol, c represents the corresponding cyclic shift value of current UE active channel, P _Slot0, P _Slot1Represent respectively time slot 0, time slot 1 current channel signal power, ant represents antenna index; The noise power calculation method is the same, and difference is that the used cyclic shift c of noise power calculation corresponds to the cyclic shift value of all vacant passages of UE (being idle channel); Went to for the 7th step;

The 7th step, send into the DTX judging module such as Fig. 2, at first initialization (step 31) is obtained current UE and is carried out the required SNR (step 32) of DTX judgement, carries out the DTX judgement of current UE.If the DTX that current UE calculates adjudicates required SNR greater than decision threshold (step 33), judge that so this UEDTX is vacation, namely transmitting data namely need carry out follow-up data equalizing demodulation, decoding etc. and process (step 34); Otherwise judge that this UE DTX as true, does not namely have transmitting data, the receiving end flow process that this UE is corresponding so just finishes, then finishes (step 35); Went to for the 8th step; c

The 8th step, the current UE corresponding data of crossing the DTX thresholding after the DTX judgement is carried out equilibrium merges, the data balancing that namely carries out between time slot, between antenna merges processing, formula simply schematically as follows:

$\mathrm{Yeq}=\underset{{\mathrm{slot}}_i}{\mathrm{\Σ}}\underset{{\mathrm{ant}}_j}{\mathrm{\Σ}}d0({\mathrm{slot}}_i,{\mathrm{ant}}_j).*{H({\mathrm{slot}}_i,{\mathrm{ant}}_j)}^H$

Wherein Yeq is the results of current UE data after equilibrium merges; Went to for the 9th step;

The 9th step, judge whether all UE have all traveled through complete (step 19), in this way, go to for the 11 step, otherwise, went to for the tenth step;

In the tenth step, current UE index Index_User adds 1 (step 20), goes to for the 3rd step;

In the 11 step, return (step 21 is sent into the processing modules such as follow-up data demodulating and decoding).

The present invention has comprised the whole scheme that LTE PUCCH DTX detects and demodulation performance promotes and concrete implementation step.

Claims (1)

1. one kind is improved the method that LTE PUCCH DTX detects performance, it is characterized in that it is comprised of following steps:

(1) calculate respectively the NI power of all UE on different time-gap, different antennae, meter is made P _n(slot _i, ant _j), i=0 wherein, 1; J=0,1 ..., M-1; M is receiving end antenna for base station number;

(2) putting user index Index_User is 1, namely from first UE, calculates the DTX of each UE after NI evens up processing by this programme and detects performance and PUCCH data demodulates performance;

(3) calculate current UE and calculate all P in the first step of correspondence _nMinimum value in the value is designated as P _n_ min;

(4) calculate the current UE different time-gap, NI corresponding to different antennae data evens up weighted factor, computational methods are for being calculated as follows:

$\mathrm{div}({\mathrm{slot}}_i,{\mathrm{ant}}_j)=\mathrm{sqrt}\left(\frac{P_n\_\min }{P_n({\mathrm{slot}}_i,{\mathrm{ant}}_j)}\right)$

(5) to channel estimation value corresponding to current UE different time-gap, different antennae and demodulating data respectively with the above-mentioned div (slot that calculates _i, ant _j) the weighting equilibrium, namely carry out corresponding NI and even up processing;

(6) channel estimation value and demodulating data after above-mentioned NI evens up are sent into power computation module, obtain current UE and carry out DTX and adjudicate needed signal power and noise power, and then obtain DTX judgement required signal-to-noise ratio;

(7) send into the DTX judging module, carry out the DTX judgement of current UE;

(8) the current UE corresponding data of crossing the DTX thresholding after the DTX judgement is carried out equilibrium and merge, the data balancing merging of namely carrying out between time slot, between antenna is processed;

(9) judge whether all UE have all traveled through complete, in this way, go to step (11);

(10) current UE index Index_User adds 1, goes to step (3);

(11) return.

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