CN113965952B - A DTX detection method and device - Google Patents
A DTX detection method and device Download PDFInfo
- Publication number
- CN113965952B CN113965952B CN202111375519.4A CN202111375519A CN113965952B CN 113965952 B CN113965952 B CN 113965952B CN 202111375519 A CN202111375519 A CN 202111375519A CN 113965952 B CN113965952 B CN 113965952B
- Authority
- CN
- China
- Prior art keywords
- dtx
- information
- hamming distance
- ratio
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/22—Matching criteria, e.g. proximity measures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Theoretical Computer Science (AREA)
- Data Mining & Analysis (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Evolutionary Biology (AREA)
- Evolutionary Computation (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Artificial Intelligence (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The application relates to a DTX detection method and device. Wherein the method comprises the following steps: performing de-rate matching on the LLR stream output by demodulation to obtain first information; decoding and anti-coding the first information to obtain second information; calculating a normalized hamming distance based on the first information and the second information; and determining a DTX decision value according to the normalized Hamming distance, and comparing the DTX decision value with a preset threshold to realize the detection of DTX. The application can reduce the DTX omission ratio, reduce the system performance loss caused by DTX detection and improve the system reliability.
Description
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for detecting DTX.
Background
In a wireless communication system, particularly in a 5G or LTE system, an uplink terminal transmits uplink scheduling signaling, HARQ-ACK feedback information or CQI feedback information of a PDSCH to a base station using a PUCCH. When the PUCCH feeds back HARQ-ACK of PDSCH, the PDCCH needs to be decoded first, if the terminal cannot decode PDCCH correctly (PDCCH missed detection or false detection), the terminal will consider that the base station does not allocate resources to the terminal or not acquire resources allocated by the base station correctly, and will not decode the corresponding PDSCH channel, so that HARQ-ACK feedback information will not be fed back, and at this time, the terminal is considered to send DTX. At this time, the base station side needs to perform DTX status detection and judgment to identify the DTX terminal, so as to avoid the base station from erroneously demodulating the PUCCH, which results in more serious higher layer retransmission.
If the base station erroneously demodulates the PUCCH, detects an ACK instead of DTX, a so-called ACK false detection, the base station will erroneously consider that the corresponding DL transport block has been received correctly by the terminal. Since the terminal does not correctly receive the transport block, the corresponding data will not be transferred to or from the MAC layer to the RLC layer. Therefore, there is a loss of data in the RLC layer. This will trigger ARQ retransmissions of the RLC layer, introducing a larger delay and possibly a larger number of retransmissions, which is undesirable for the network.
If the terminal fails to successfully decode the PDCCH, a problem arises in that the terminal does not know that the PDSCH allocated to him exists. In this case, the terminal does not generate ACK/NACK information. This situation often occurs in networks, where the response of the terminal is DTX, i.e. no ACK information is sent to the base station, nor NACK information. Since the base station does not know in advance whether the terminal detects the PDCCH, the base station expects or considers that the symbol of the predetermined position is an ACK/NACK symbol and performs normal ACK/NACK decoding. If the base station does not take into account the possibility of DTX, the ACK/NACK decoder, after decoding the extracted symbols, returns an ACK or NACK message to the upper layer, which in fact does not convey any information on the symbols. Typically, either ACK or NACK messages may be fed back. The consequences of false detection of DTX as an ACK have a greater impact on system performance than the consequences of false detection of DTX as a NACK.
In the prior publication CN106535235a, DTX detection of PUCCH is based on terminal signal power estimation and noise power, SNR is measured and compared with a preset DTX threshold. When determining that the SNR of one terminal is less than the DTX threshold, determining the terminal as a DTX terminal; when it is determined that the SNR of one terminal is not less than the DTX threshold, the terminal is determined as a non-DTX terminal. The problems with this SNR based DTX detection approach are: the DTX optimal decision threshold is greatly affected by the SNR of the actual environment, varies with the variation of the actual environment SNR, and cannot adapt to environments of different SNR when a static DTX threshold is set. In addition, under the condition of low signal-to-noise ratio, the omission ratio of the traditional DTX detection method is higher, so that the DTX detection performance is influenced, and the system performance deterioration caused by DTX detection is obvious.
Disclosure of Invention
The technical problem to be solved by the application is to provide a DTX detection method which can reduce the DTX omission ratio, reduce the system performance loss caused by DTX detection and improve the system reliability.
The technical scheme adopted for solving the technical problems is as follows: there is provided a DTX detection method comprising the steps of:
(1) Performing de-rate matching on the LLR stream output by demodulation to obtain first information;
(2) Decoding and anti-coding the first information to obtain second information;
(3) Calculating a normalized hamming distance based on the first information and the second information;
(4) And determining a DTX decision value according to the normalized Hamming distance, and comparing the DTX decision value with a preset threshold to realize the detection of DTX.
In the step (3) throughObtaining a normalized hamming distance, wherein ratio f To normalize Hamming distance, < >>N is the length of the mother code, c i LLR for the length of the second information i For the soft value of the first information, sign (x) is a sign function, when x is less than or equal to 0, sign (x) =1, and when x is more than 0, sign (x) =0;
The pass ratio in step (4) =1-ratio f Obtaining a DTX decision value, wherein the ratio is the DTX decision value f To normalize the hamming distance.
The technical scheme adopted for solving the technical problems is as follows: also provided is a DTX detection apparatus including:
the first information acquisition module is used for performing de-rate matching on the LLR stream output by demodulation to obtain first information;
the second information acquisition module is used for decoding and de-encoding the first information to obtain second information;
a calculation module for calculating a normalized hamming distance based on the first information and the second information;
and the detection module is used for determining a DTX decision value according to the normalized Hamming distance, and comparing the DTX decision value with a preset threshold to realize the detection of DTX.
The calculation module is used for calculating the position of the object byObtaining a normalized hamming distance, wherein ratio f To normalize Hamming distance, < >>N is the length of the mother code, c i LLR for the length of the second information i For the soft value of the first information, sign (x) is a sign function, when x is less than or equal to 0, sign (x) =1, and when x is more than 0, sign (x) =0;
The detection module uses ratio=1-ratio f Obtaining a DTX decision value, wherein the ratio is the DTX decision value f To normalize the hamming distance.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the application has the following advantages and positive effects: the application calculates normalized Hamming distance based on LLR after rate-solving matching and bit sequence after decoding and anti-coding, and then carries out DTX detection, the detection quantity has good distinction degree in high and low signal-to-noise ratio, can obtain good detection performance under the condition of meeting false alarm, and in addition, the scheme can be applicable to different decoders without being limited by decoder types and has wide application range.
Drawings
FIG. 1 is a flow chart of a first embodiment of the present application;
FIG. 2 is a schematic diagram of a first embodiment of the present application;
fig. 3 is a block diagram of a second embodiment of the present application.
Detailed Description
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Considering BPSK modulation (bit 0 modulation to 1, bit 1 modulation to-1) under AWGN channel, the code length n=2 n Is a source of:its coding structure is->Representing Cronecker product, metropolyl>Representing the transmission sequence, the reception sequence-> Is AWGN noise sequence, obeys normal distribution N (0, sigma) 2 )。
Since each bit is affected by noise, and the noise on each bit satisfies the normal distribution N (0, σ 2 )，σ 2 ＝10 -SNR/10 Keeping in mind the signal-to-noise ratio SNR for each bit, two characterizations are considered below for each bit after de-rate matching:
(1) The mean value of the absolute values of the decoding error bit LLR (assuming bit "0" is sent, erroneous judgment is bit "1"):
wherein,- + < x < +. Infinity is the standard distribution function of normal distribution
(2) The mean value of the absolute values of the LLR of the received bits (assuming the transmitted bit "0"):
the Ratio of Ratio (σ) is defined as:
the resulting Ratio (σ) graph obtained by MATLAB is shown in fig. 2. Theoretically, ratio (σ) has a monotonically increasing function with respect to σ and has the following limit values:from the above analysis results, ratio (σ) has a clear distinction between high and low signal to noise ratios, and DTX detection can be performed using this good distinction.
Based on the above analysis, a first embodiment of the present application relates to a DTX detection method, as shown in fig. 1, comprising the steps of: performing de-rate matching on the LLR stream output by demodulation to obtain first information; decoding and anti-coding the first information to obtain second information; calculating a normalized hamming distance based on the first information and the second information; and determining a DTX decision value according to the normalized Hamming distance, and comparing the DTX decision value with a preset threshold to realize the detection of DTX. As can be seen from this, the DTX detection method of the present embodiment performs DTX detection based on the normalized hamming distance between the demodulated and rate-matched LLR stream and the de-coded bit sequence of the decoded bit sequence.
A specific embodiment is given below in connection with Polar codes. It is worth mentioning that other coding schemes are equally applicable to the present embodiment, such as LDPC, RM and Turbo coding, etc.
Definition of BM and Sum LLR Two statistics:
the normalized hamming distance is finally obtained as:wherein ratio is f To normalize the hamming distance, N is the length of the mother code, c i LLR for the length of the second information (i.e., for the inverse code bits of the Polar code) i For the soft value of the first information (i.e., the LLR stream outputted by demodulation after rate-demodulation), sign (x) is a sign function, when x is less than or equal to 0, sign (x) =1, and when x > 0, sign (x) =0;
As can be seen from FIG. 2, when there is no signal transmission or the SNR is relatively low, ratio f 0.5, ratio when the signal-to-noise Ratio is relatively high f 0, therefore, the Ratio at the time of signal transmission or not can be utilized f And judging the signal DTX state with obvious discrimination.
Because of the non-ideal factors in the actual system, DTX threshold simulation needs to be carried out under different scenes to obtain DTX threshold Th, so that DTX detection is carried out. At the time of detection, by ratio=1-ratio f And obtaining a DTX decision value, wherein the DTX decision value is in a DTX state when the ratio is less than or equal to Th, and the DTX decision value is in a non-DTX state when the ratio is more than Th.
It is easy to find that the present application mainly uses LLR after rate-resolving matching and bit sequence after decoding and anti-coding to calculate normalized "Hamming" distance, then carries on DTX detection, this detection quantity has good distinction in high and low signal-to-noise ratio, can obtain very good detection performance under the condition of meeting false alarm, in addition this scheme can be suitable for different decoders, is not limited by the decoder type, the application is extensive.
A second embodiment of the present application relates to a DTX detection apparatus, as shown in fig. 3, comprising: the first information acquisition module is used for performing de-rate matching on the LLR stream output by demodulation to obtain first information; the second information acquisition module is used for decoding and de-encoding the first information to obtain second information; a calculation module for calculating a normalized hamming distance based on the first information and the second information; and the detection module is used for determining a DTX decision value according to the normalized Hamming distance, and comparing the DTX decision value with a preset threshold to realize the detection of DTX.
Wherein the calculation module is used for calculating the data byObtaining a normalized hamming distance, wherein ratio f To normalize Hamming distance, < >>N is the length of the mother code, c i LLR for the length of the second information i For the soft value of the first information, sign (x) is a sign function, when x is less than or equal to 0, sign (x) =1, and when x is more than 0, sign (x) =0;
The detection module uses ratio=1-ratio f Obtaining a DTX decision value, wherein the ratio is the DTX decision value f To normalize the hamming distance.
Therefore, the application carries out DTX detection based on the normalized Hamming distance between the LLR stream after de-rate matching output by the decoder and the bit sequence after de-encoding of the decoded bit sequence, thereby being capable of reducing the DTX omission rate, reducing the system performance loss caused by DTX detection and improving the system reliability.
Claims (4)
1. A DTX detection method comprising the steps of:
(1) Performing de-rate matching on the LLR stream output by demodulation to obtain first information;
(2) Decoding and anti-coding the first information to obtain second information;
(3) Based on the first information and the second informationCalculating normalized Hamming distance; wherein by means ofObtaining normalized Hamming distance and ratio f In order to normalize the hamming distance,
n is the length of the mother code, c i LLR for the length of the second information i For soft values of the first information sign (x) is a sign function, when x is less than or equal to 0, sign (x) =1, when x > 0,
sign(x)＝0；
(4) And determining a DTX decision value according to the normalized Hamming distance, and comparing the DTX decision value with a preset threshold to realize the detection of DTX.
2. The DTX detection method of claim 1, wherein the passing ratio in step (4) is 1-ratio f Obtaining a DTX decision value, wherein the ratio is the DTX decision value f To normalize the hamming distance.
3. A DTX detection apparatus, comprising:
the first information acquisition module is used for performing de-rate matching on the LLR stream output by demodulation to obtain first information;
the second information acquisition module is used for decoding and de-encoding the first information to obtain second information;
a calculation module for calculating a normalized hamming distance based on the first information and the second information; the calculation module is used for calculating the position of the object byObtaining normalized Hamming distance, whichIn (a) ratio f In order to normalize the hamming distance,
n is the length of the mother code, c i LLR for the length of the second information i For soft values of the first information sign (x) is a sign function, when x is less than or equal to 0, sign (x) =1, when x > 0,
sign(x)＝0；
and the detection module is used for determining a DTX decision value according to the normalized Hamming distance, and comparing the DTX decision value with a preset threshold to realize the detection of DTX.
4. A DTX detection apparatus according to claim 3, wherein the detection module is configured to detect the presence of a signal of a ratio = 1-ratio f Obtaining a DTX decision value, wherein the ratio is the DTX decision value f To normalize the hamming distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375519.4A CN113965952B (en) | 2021-11-19 | 2021-11-19 | A DTX detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111375519.4A CN113965952B (en) | 2021-11-19 | 2021-11-19 | A DTX detection method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113965952A CN113965952A (en) | 2022-01-21 |
| CN113965952B true CN113965952B (en) | 2023-12-05 |
Family
ID=79471204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111375519.4A Active CN113965952B (en) | 2021-11-19 | 2021-11-19 | A DTX detection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113965952B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102783110A (en) * | 2010-01-28 | 2012-11-14 | Lg电子株式会社 | Method and apparatus for transmitting uplink control information in a wireless communication system |
| CN104968014A (en) * | 2015-07-24 | 2015-10-07 | 北京北方烽火科技有限公司 | DTX detection method and device for uplink control information |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9414431B2 (en) * | 2014-02-14 | 2016-08-09 | Freescale Semiconductor, Inc. | Method of discontinuous transmission detection |
| US11057159B2 (en) * | 2019-01-23 | 2021-07-06 | Hong Kong Applied Science And Technology Research Institute Co. Ltd. | Method and an apparatus for improving a determination of HARQ-ACK messages in a wireless communications system |
-
2021
- 2021-11-19 CN CN202111375519.4A patent/CN113965952B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102783110A (en) * | 2010-01-28 | 2012-11-14 | Lg电子株式会社 | Method and apparatus for transmitting uplink control information in a wireless communication system |
| CN104968014A (en) * | 2015-07-24 | 2015-10-07 | 北京北方烽火科技有限公司 | DTX detection method and device for uplink control information |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113965952A (en) | 2022-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8327234B2 (en) | Code block reordering prior to forward error correction decoding based on predicted code block reliability | |
| EP2274859B1 (en) | Pre-emptive acknowledgement for data transmission in a communication system | |
| US8018902B2 (en) | Methods and apparatus for channel quality indicator determination | |
| KR101149153B1 (en) | Reducing harq retransmissions using peak power management techniques | |
| US6977888B1 (en) | Hybrid ARQ for packet data transmission | |
| US8248938B2 (en) | Preamble miss detection in transmission of multi-slot packets | |
| CN115051775B (en) | Efficient automatic retransmission method in broadband ad hoc network | |
| JP4607519B2 (en) | Optimization of erasure decoding of acknowledgment / negative acknowledgment information in wireless communication systems | |
| CN105847199B (en) | The method and device of PUSCH Channel Detection ACK/NACK state | |
| CN101636988B (en) | Techniques for Improved Error Detection in Wireless Communication Systems | |
| US20050063344A1 (en) | Methods and apparatus for efficient decoding | |
| WO2018090571A1 (en) | Acknowledgement/negative acknowledgement information detection method, apparatus and storage medium | |
| EP2210360B1 (en) | Apparatus and method for decoding in mobile communication system | |
| CA2694933C (en) | Code block reordering prior to forward error correction decoding based on predicted code block reliability | |
| TWI325241B (en) | Method and apparatus for avoiding an erroneous determination of an acknowledge (ack) of a communication containing an error | |
| US9083524B2 (en) | Systems and methods for sending an acknowledgement message in a wireless communication system | |
| CN113965952B (en) | A DTX detection method and device | |
| CN105721115B (en) | An automatic retransmission request method without error checking code | |
| EP3602881B1 (en) | Acknowledgment signalling in communications | |
| CN113170333B (en) | Method and apparatus for detecting partial Discontinuous Transmission (DTX) using channel estimation data | |
| CN103636148B (en) | The method of noise, device and ofdm system in opposing ofdm system | |
| KR20080010640A (en) | Data block joining method and complex retransmission method | |
| KR20060014572A (en) | Method for transmitting uplink control information in mobile communication system and method for determining reception of control information at receiving side |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |