CN104168094A - Discontinuous transmission detection method - Google Patents
Discontinuous transmission detection method Download PDFInfo
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- CN104168094A CN104168094A CN201310187368.9A CN201310187368A CN104168094A CN 104168094 A CN104168094 A CN 104168094A CN 201310187368 A CN201310187368 A CN 201310187368A CN 104168094 A CN104168094 A CN 104168094A
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Abstract
The invention discloses a discontinuous transmission detection method. The method comprises the following steps: a received signal is reversely processed, a modulation symbol is reconstructed, and the test statistics is calculated accordingly; then, the threshold of the test statistics is judged according to the condition number X expected during base station detection and the probability of false alarm desired by a system; and finally, whether UE transmits a signal is judged according to whether or not the test statistics is greater than the threshold. By adopting the discontinuous transmission detection method, whether the UE transmits a signal can be detected effectively, and the detection is not constrained by whether or not the system has an idle orthogonal ZC sequence. The method is also applicable to the situation in which the UE uses a plurality of information bits to transmit HARQ-ACK.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to the detection method of a kind of discontinuous transmission (Discontinuous Transmission, DTX).
Background technology
In 3G and 4G mobile communication system, the reception that mandate and the scheduling of subscriber equipment (User Equipment, UE) by base station realizes business datum and send transmission.For downlink service data, whether UE, by informing base station at uplink feedback ACK/NACK, has correctly received downlink service data.But because UE is when detecting downstream grants, may detect failure, now UE can not receive the angle of ACK/NACK in uplink feedback ACK/NACK information from base station, and this situation is called discontinuous transmission.Because base station does not know whether, do not send ACK/NACK, if whether can not distinguish transmitted signal, just there will be mistake to receive ACK/NACK.Therefore, system need to detect to judge whether UE has signal to send by DTX.
Existing DTX detection method has following two kinds.
First method is that base station is carried out after RM decoding to the received signal, utilize its maximum likelihood value and inferior maximum likelihood value to calculate confidence value, wherein the computing formula of confidence value Z is :-abs(time maximum likelihood value of Z=[abs (maximum likelihood value))]/abs (maximum likelihood value).Then compare and adjudicate with default DTX decision threshold.If confidence value Z is greater than DTX decision threshold, adjudicates UE end and sent signal; Otherwise if confidence value Z is less than or equal to DTX decision threshold, adjudicating UE end does not have transmitted signal.
Second method is that base station is calculated respectively signal power and noise power to the received signal, then utilizes its ratio and default DTX decision threshold to compare and adjudicate.
Above-mentioned the first DTX detection method need to utilize maximum-likelihood decoding to obtain confidence value, for not adopting the communication system of maximum-likelihood decoding cannot adopt the method.And its DTX decision threshold is associated with transmission channel, its default thresholding of different transmission channels is different, has restricted its scope of application, and versatility is poor.
Above-mentioned the second DTX detection method is utilized quadrature ZC sequence (orthogonal spreading sequence that in LTE system, PUCCH Format1/1a/1b adopts, is called W3 sequence [+1+1-1-1]) the calculating noise power of current free time, does not need channel reservation resource.Like this, while there is no idle quadrature ZC sequence in system, just cannot calculating noise power, thus cause the method to use.In addition, the method also cannot be applied to the situation that UE is used a plurality of information bits transmission mixed automatic retransfer request-replies (hybridautomatic repeat-request acknowledgement, HARQ-ACK).
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of discontinuous transmission detection method, and the method is not limited to the whether available free quadrature ZC sequence of system, and is applicable to the situation that UE is used a plurality of information bits transmission HARQ-ACK.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A discontinuous transmission method, comprising:
A, base station, according to the current antenna base band data receiving, obtain business datum symbol and reference symbol that user equipment (UE) sends;
B, described base station, according to described reference symbol, obtain corresponding Noise Variance Estimation value; And described business datum symbol and reference symbol are carried out to transmitting terminal against processing, and the described contrary result of processing is reconstructed to modulation symbol, the contrary processing of described transmitting terminal comprises carries out equilibrium calculation to described business datum symbol and reference symbol;
Current test statistics T, according to the symbolic vector after the modulation symbol after described reconstruct, described equilibrium calculation and described Noise Variance Estimation value, is determined according to NP criterion in c, described base station;
D, described base station send according to described UE the bit length that HARQ-ACK is used, and determine the status number that discontinuous transmission DTX detects; And according to the status number of default false alarm probability and described DTX detection, determine corresponding DTX detection threshold value, described false alarm probability will not be for having transmitted signal to detect as ACK shape probability of state;
E, described DTX detection threshold value and described inspection statistics value T are compared, determine whether transmitted signal of described UE.
In sum, the discontinuous transmission detection method that the present invention proposes, carry out being to received signal reconstructed modulation symbol after contrary processing, and calculate accordingly test statistics, simultaneously, while detecting according to base station, the false alarm probability of desired status number X and system requirements judges the threshold value of test statistics, finally according to this test statistics, whether is greater than this threshold value, can judge whether transmitted signal of UE.Like this, because depending on orthogonal sequence, the present invention do not realize, therefore, the quadrature ZC the sequence whether system that is not limited to is available free, and owing to being that the bit length that sends HARQ-ACK information according to UE is determined desired detected state number, and according to detected state number, corresponding check threshold value is set, therefore, be applicable to UE and use a plurality of information bits to send the situation of HARQ-ACK.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Core concept of the present invention is: carry out to received signal after contrary processing of transmitting terminal, reconstruct modulation symbol, according to NP criterion, utilize a test statistics of modulation symbol structure of reconstruct, and determine relevant detected state number according to the bit length of UE transmission HARQ-ACK information, according to detected state number and default false alarm probability, corresponding check threshold value is set, finally, by test statistics and this threshold value comparison, the information that determined whether sends.Like this, owing to depending on orthogonal sequence in said method, do not realize, therefore, the quadrature ZC the sequence whether system that is not limited to is available free, and owing to being that the bit length that sends HARQ-ACK information according to UE is determined relevant detected state number, and according to detected state number, corresponding check threshold value is set, be therefore applicable to UE and use a plurality of information bits to send the situation of HARQ-ACK.
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one, and as shown in Figure 1, this embodiment mainly comprises:
Step 101, base station, according to the current antenna base band data receiving, obtain business datum symbol and reference symbol that subscriber equipment (UE) sends.
The concrete methods of realizing of this step is grasped by those skilled in the art, does not repeat them here.
Step 102, described base station, according to described reference symbol, obtain corresponding Noise Variance Estimation value; And described business datum symbol and reference symbol are carried out to transmitting terminal against processing, and the described contrary result of processing is reconstructed to modulation symbol, the contrary processing of described transmitting terminal comprises carries out equilibrium calculation to described business datum symbol and reference symbol.
In this step, the same existing system of the acquisition methods of Noise Variance Estimation value, does not repeat them here.
In actual applications, the operation meeting that need to carry out while carrying out the contrary processing of transmitting terminal is different along with the difference of system type, such as, for the DTX detection of PUCCH Format1/1a/1b in LTE/LTE-A system, do not need to carry out modulating/demodulating, chnnel coding/decoding calculating.But, will at least comprise the operation of equilibrium calculation.
Further, described transmitting terminal can also comprise against processing:
Result to described equilibrium calculation, separates mediation and merges, and the result being combined is carried out channel decoding.
The above-mentioned contrary detailed process of processing is embodied as those skilled in the art and grasps and do not repeat them here.
Current test statistics T, according to the symbolic vector after the modulation symbol after described reconstruct, described equilibrium calculation and described Noise Variance Estimation value, is determined according to Nie Man-Pearson came (Neyman-Pearson, NP) criterion in step 103, described base station.
In this step, will, according to NP criterion, determine current test statistics T.Particularly, can realize by the following method:
Step 1031, according to
calculate and detect t; Wherein,
for described business datum symbol and reference symbol are carried out to the symbolic vector obtaining after equilibrium calculation; d
hconjugate transpose for the modulation symbol vector after reconstruct; M
symbnumber for the modulation symbol after reconstruct.
Step 1032, utilize described t, according to
calculate current test statistics T, wherein,
for noise variance.
In this step, constructed test statistics
it should be noted that, this test statistics distributes obeying the card side that the degree of freedom is 2.
Step 104, described base station send according to described UE the bit length that HARQ-ACK is used, and determine the status number that discontinuous transmission DTX detects; And according to the status number of default false alarm probability and described DTX detection, determine corresponding DTX detection threshold value, described false alarm probability will not be for having transmitted signal to detect as ACK shape probability of state.
Preferably,
Here it should be noted that, in actual applications, UE can send the HARQ-ACK information of different bit lengths, and when eNodeB carries out DTX detection, desired status number is not identical.For example, if UE sends 1 bit HARQ-ACK information, eNodeB need to adjudicate output in this three state of DTX/ACK/NACK; If UE sends 2 bit HARQ-ACK information, eNodeB need to adjudicate output in these 5 kinds of states of DTX/ACK-ACK/ACK-NACK/NACK-ACK/NACK-NACK.If UE sends schedule information (SR), now, UE does not send HARQ-ACK information, and eNodeB need to be at DTX/SR, in these 2 kinds of states, adjudicates output.Therefore, can be according to X=2 in this step
n+ 1, determine the status number X that DTX detects, wherein, N is that described UE sends the bit length that HARQ-ACK is used.
Preferably, in this step, can adopt following method to determine DTX detection threshold value:
First, according to the * P of α=(X-1)
dTX → ACK, determine and will not have transmitted signal to detect as the probable value α of other states.
Wherein, α≤1, P
dTX → ACKfor described false alarm probability, this value for preset value take that embodiment system allows will not have transmitted signal to detect be the probability demands of ACK state, X is the status number that described DTX detects.
Then, according to test statistics
the characteristic that the card side that the obedience degree of freedom is 2 distributes, corresponding when right tail probability is α
value is defined as described detection threshold value.
In this step, the bit length of using according to UE transmission HARQ-ACK is determined the status number that current DTX detects, and then determines corresponding detection threshold value according to status number.Like this, the corresponding detection threshold value of HARQ-ACK information of different bit length is also by difference.So in step 104, take into full account UE and sent the bit length that HARQ-ACK is used, thereby can guarantee to be applicable to UE, used a plurality of information bits to send the situation of HARQ-ACK.
Here, network side obtains concrete grammar that UE sends the bit length that HARQ-ACK uses by those skilled in the art are grasped, and does not repeat them here.
Step 105, described DTX detection threshold value and described inspection statistics value T are compared, determine whether transmitted signal of described UE.
Preferably, the determination methods that this step is concrete is:
If described inspection statistics value T is greater than described DTX detection threshold value, determine described UE transmitted signal, otherwise, determine that described UE does not have transmitted signal.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a discontinuous transmission method, is characterized in that, comprising:
A, base station, according to the current antenna base band data receiving, obtain business datum symbol and reference symbol that user equipment (UE) sends;
B, described base station, according to described reference symbol, obtain corresponding Noise Variance Estimation value; And described business datum symbol and reference symbol are carried out to transmitting terminal against processing, and the described contrary result of processing is reconstructed to modulation symbol, the contrary processing of described transmitting terminal comprises carries out equilibrium calculation to described business datum symbol and reference symbol;
Current test statistics T, according to the symbolic vector after the modulation symbol after described reconstruct, described equilibrium calculation and described Noise Variance Estimation value, is determined according to Nie Man-Pearson came NP criterion in c, described base station;
D, described base station send according to described UE the bit length that HARQ-ACK is used, and determine the status number that discontinuous transmission DTX detects; And according to the status number of default false alarm probability and described DTX detection, determine corresponding DTX detection threshold value, described false alarm probability will not be for having transmitted signal to detect as ACK shape probability of state;
E, described DTX detection threshold value and described inspection statistics value T are compared, determine whether transmitted signal of described UE.
2. method according to claim 1, is characterized in that, described step c comprises:
According to
calculate and detect t; Wherein,
for described business datum symbol and reference symbol are carried out to the symbolic vector obtaining after equilibrium calculation; d
hconjugate transpose for the modulation symbol vector after reconstruct; M
symbnumber for the modulation symbol after reconstruct;
Utilize described t, according to
calculate current test statistics T, wherein,
for noise variance.
3. method according to claim 1, is characterized in that, in steps d according to X=2
n+ 1, calculate the status number X that described DTX detects, wherein, N is that described UE sends the bit length that HARQ-ACK is used.
4. method according to claim 2, is characterized in that, described in steps d, according to the status number of default false alarm probability and described DTX detection, determines that corresponding DTX detection threshold value comprises:
According to the * P of α=(X-1)
dTX → ACK, determine that by not having transmitted signal to detect be the probable value α of other states, wherein, α≤1, P
dTX → ACKfor described false alarm probability, X is the status number that described DTX detects;
According to test statistics
the characteristic that the card side that the obedience degree of freedom is 2 distributes, corresponding when right tail probability is α
value is defined as described detection threshold value.
5. method according to claim 1, is characterized in that, described in step b, transmitting terminal further comprises against processing:
Result to described equilibrium calculation, separates mediation and merges, and the result being combined is carried out channel decoding.
6. method according to claim 1, is characterized in that, described step e comprises:
If described inspection statistics value T is greater than described DTX detection threshold value, determine described UE transmitted signal, otherwise, determine that described UE does not have transmitted signal.
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| CN105847199A (en) * | 2016-03-18 | 2016-08-10 | 中国科学院自动化研究所 | Method and device for detecting ACK/NACK state on PUSCH |
| CN105846948A (en) * | 2015-01-13 | 2016-08-10 | 中兴通讯股份有限公司 | Method and device for achieving HARQ-ACK detection |
| CN106255136A (en) * | 2016-09-13 | 2016-12-21 | 京信通信技术(广州)有限公司 | A kind of DTX decision method and device |
| WO2018196737A1 (en) * | 2017-04-24 | 2018-11-01 | 中兴通讯股份有限公司 | Method and apparatus for discontinuous transmission detection |
| CN108900277A (en) * | 2018-04-23 | 2018-11-27 | 中国科学院自动化研究所 | A kind of DTX detection method and system based on 5G communication network |
| CN112165370A (en) * | 2020-08-27 | 2021-01-01 | 新华三技术有限公司成都分公司 | Method for detecting Discontinuous Transmission (DTX), equipment and storage medium |
| WO2021189299A1 (en) * | 2020-03-24 | 2021-09-30 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | An improved method and device for detecting discontinuous transmission (dtx) for small block encoded signals |
| CN114258060A (en) * | 2020-09-24 | 2022-03-29 | 大唐移动通信设备有限公司 | DTX detection method, device and processor-readable storage medium |
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| CN105846948A (en) * | 2015-01-13 | 2016-08-10 | 中兴通讯股份有限公司 | Method and device for achieving HARQ-ACK detection |
| CN105846948B (en) * | 2015-01-13 | 2020-04-28 | 中兴通讯股份有限公司 | Method and device for realizing HARQ-ACK detection |
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| WO2018196737A1 (en) * | 2017-04-24 | 2018-11-01 | 中兴通讯股份有限公司 | Method and apparatus for discontinuous transmission detection |
| CN108900277A (en) * | 2018-04-23 | 2018-11-27 | 中国科学院自动化研究所 | A kind of DTX detection method and system based on 5G communication network |
| CN108900277B (en) * | 2018-04-23 | 2020-07-07 | 中国科学院自动化研究所 | DTX detection method and system based on 5G communication network |
| US11363578B2 (en) | 2020-03-24 | 2022-06-14 | Hong Kong Applied Science And Technology Research Institue Company Limited | Method and device for detecting discontinuous transmission (DTX) for small block encoded signals |
| WO2021189299A1 (en) * | 2020-03-24 | 2021-09-30 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | An improved method and device for detecting discontinuous transmission (dtx) for small block encoded signals |
| CN113728671A (en) * | 2020-03-24 | 2021-11-30 | 香港应用科技研究院有限公司 | Method and apparatus for discontinuous transmission Detection (DTX) of small block code signals |
| CN113728671B (en) * | 2020-03-24 | 2023-09-05 | 香港应用科技研究院有限公司 | Improved method and apparatus for discontinuous transmission Detection (DTX) of small block code signals |
| CN112165370A (en) * | 2020-08-27 | 2021-01-01 | 新华三技术有限公司成都分公司 | Method for detecting Discontinuous Transmission (DTX), equipment and storage medium |
| CN112165370B (en) * | 2020-08-27 | 2022-07-12 | 新华三技术有限公司成都分公司 | Method for detecting Discontinuous Transmission (DTX), equipment and storage medium |
| CN114258060A (en) * | 2020-09-24 | 2022-03-29 | 大唐移动通信设备有限公司 | DTX detection method, device and processor-readable storage medium |
| CN114258060B (en) * | 2020-09-24 | 2023-10-20 | 大唐移动通信设备有限公司 | DTX detection method, DTX detection device and processor readable storage medium |
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