CN113965952A - DTX detection method and device - Google Patents

DTX detection method and device Download PDF

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CN113965952A
CN113965952A CN202111375519.4A CN202111375519A CN113965952A CN 113965952 A CN113965952 A CN 113965952A CN 202111375519 A CN202111375519 A CN 202111375519A CN 113965952 A CN113965952 A CN 113965952A
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dtx
information
ratio
hamming distance
sign
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CN113965952B (en
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谭成群
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White Box Shanghai Microelectronics Technology Co ltd
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    • 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; CALCULATING OR 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

Abstract

The invention relates to a DTX detection method and a DTX detection device. The method comprises the following steps: carrying out rate de-matching on the LLR stream output by demodulation to obtain first information; decoding and inverse 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 DTX detection. The invention can reduce the DTX missing rate, reduce the system performance loss caused by DTX detection and improve the system reliability.

Description

DTX detection method and device
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a DTX detection method and apparatus.
Background
In a wireless communication system, specifically a 5G or LTE system, uplink scheduling signaling, HARQ-ACK feedback information of PDSCH or CQI feedback information is transmitted to a base station by an uplink terminal using PUCCH. When the HARQ-ACK of the PDSCH is fed back by the PUCCH, the PDCCH needs to be decoded firstly, if the terminal cannot decode the PDCCH correctly (the PDCCH is missed or mistakenly detected), the terminal considers that the base station does not allocate resources to the terminal or does not acquire the resources allocated by the base station correctly, a corresponding PDSCH channel cannot be decoded, and therefore HARQ-ACK feedback information cannot be fed back, and at the moment, the terminal is considered to send DTX. At this time, the base station side needs to perform DTX state detection and judgment to identify the DTX terminal, so as to avoid the base station erroneously demodulating the PUCCH, which leads to more serious high-level retransmission.
If the base station erroneously demodulates the PUCCH and detects an ACK instead of DTX, a so-called ACK misdetection, the base station will erroneously assume that the corresponding DL transport block has been correctly received by the terminal. Since the terminal does not correctly receive the transport block, corresponding data will not be delivered to the MAC layer nor from the MAC layer to the RLC layer. Therefore, data is lost in the RLC layer. This will trigger ARQ retransmissions at the RLC layer, introducing large delays and possibly large numbers of retransmissions, which is undesirable for the network.
If the terminal fails to successfully decode the PDCCH, a problem occurs 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 may occur frequently in the network, in which case the terminal responds with DTX, i.e. no ACK information nor NACK information is sent to the base station. Since the base station does not know in advance whether the terminal detects the PDCCH or not, the base station expects or considers the symbol of the predetermined position to be an ACK/NACK symbol and performs normal ACK/NACK decoding. If the base station does not consider the possibility of DTX, the ACK/NACK decoder will return an ACK or NACK message to the upper layer after decoding the extracted symbols, which in fact do not convey any information. In general, either ACK or NACK messages may be fed back. The consequences of a false detection of DTX as an ACK have a greater impact on system performance than the consequences of a false detection of DTX as a NACK.
Prior publication CN106535235A, wherein DTX detection on PUCCH is based on terminal signal power estimation and noise power, SNR is measured and compared with a preset DTX threshold. When the SNR of one terminal is smaller than the DTX threshold, determining the terminal as a DTX terminal; and when the SNR of one terminal is not smaller than the DTX threshold, determining the terminal as a non-DTX terminal. The problem with this SNR-based DTX detection method is: the DTX optimal decision threshold is greatly affected by the SNR of the actual environment, changes with the change of the SNR of the actual environment, and cannot adapt to environments with different SNRs when the static DTX threshold is set. In addition, under the condition of low signal-to-noise ratio, the missed detection rate of the traditional DTX detection method is high, 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 invention is to provide a DTX detection method, which can reduce the DTX missing rate, reduce the system performance loss caused by DTX detection and improve the system reliability.
The technical scheme adopted by the invention for solving the technical problems is as follows: a DTX detection method is provided, which comprises the following steps:
(1) carrying out rate de-matching on the LLR stream output by demodulation to obtain first information;
(2) decoding and inverse 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 DTX detection.
In the step (3) by
Figure BDA0003363834890000021
Obtaining a normalized Hamming distance, wherein ratiofIn order to normalize the hamming distance,
Figure BDA0003363834890000022
n is the length of the mother code, ciFor the length of the second information, LLRiSign (x) is a sign function, and when x is less than or equal to 0, sign (x) is 1, and when x is greater than 0, sign (x) is 0;
Figure BDA0003363834890000023
a pass ratio of 1-ratio in the step (4)fObtaining a DTX decision value, wherein ratio is DTX decision value, ratiofNormalized hamming distance.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is also provided a DTX detection apparatus comprising:
the first information acquisition module is used for carrying out rate de-matching on the LLR stream output by demodulation to obtain first information;
the second information acquisition module is used for decoding and inversely coding 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 judgment value according to the normalized Hamming distance and comparing the DTX judgment value with a preset threshold to realize DTX detection.
The computing module passes
Figure BDA0003363834890000031
Obtaining a normalized Hamming distance, wherein ratiofIn order to normalize the hamming distance,
Figure BDA0003363834890000032
n is the length of the mother code, ciFor the length of the second information, LLRiSign (x) is a sign function, and when x is less than or equal to 0, sign (x) is 1, and when x is greater than 0, sign (x) is 0;
Figure BDA0003363834890000033
the detection module passes ratio 1-ratiofObtaining a DTX decision value, wherein ratio is the DTX decision value and ratiofNormalized hamming distance.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: the invention calculates the normalized Hamming distance based on the LLR after rate de-matching and the bit sequence after decoding and de-coding, and then carries out DTX detection, the detection quantity has good regional division at high and low signal-to-noise ratios, and can obtain good detection performance under the condition of meeting the false alarm.
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FIG. 1 is a flow chart of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a first embodiment of the present invention;
fig. 3 is a block diagram of a second embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Consider BPSK modulation (bit 0 modulated to 1 and bit 1 modulated to-1) over AWGN with a code length N of 2nThe source of (2):
Figure BDA0003363834890000041
the coding structure is
Figure BDA0003363834890000042
Which represents the kronecker product of,
Figure BDA0003363834890000043
indicating a transmission sequence, a reception sequence
Figure BDA0003363834890000044
Figure BDA0003363834890000045
For AWGN noise sequences, a normal distribution N (0, σ) is obeyed2)。
Since each bit is affected by noise and the noise on each bit satisfies a normal distribution N (0, σ)2)，σ2＝10-SNR/10Keeping in mind the SNR of each bit, two tokens are considered for each bit after rate de-matching:
(1) mean of absolute values of decoding error bit LLRs (assuming bit "0" is sent and bit "1" is erroneously determined):
Figure BDA0003363834890000046
wherein the content of the first and second substances,
Figure BDA0003363834890000047
x [ + ] infinity is the distribution function of the standard normal distribution
(2) Mean of absolute values of received bit LLRs (assuming transmission bit "0"):
Figure BDA0003363834890000051
the Ratio defining Ratio (σ) is:
Figure BDA0003363834890000052
the Ratio (σ) graph derived by MATLAB is shown in fig. 2. Theoretically, Ratio (σ) is a monotonically increasing function of σ and has the following limit values:
Figure BDA0003363834890000053
from the above analysis results, Ratio (σ) has a distinct discrimination at high and low snr, and DTX detection can be performed by using the good discrimination.
Based on the above analysis, a first embodiment of the present invention relates to a DTX detection method, as shown in fig. 1, including the following steps: carrying out rate de-matching on the LLR stream output by demodulation to obtain first information; decoding and inverse 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 DTX detection. As can be seen from this, the DTX detection method according to the present embodiment performs DTX detection based on the normalized hamming distance between the demodulated and output LLR stream after rate de-matching and the bit sequence after de-encoding of the decoded bit sequence.
A specific example is given below in conjunction 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 SumLLRTwo statistics:
Figure BDA0003363834890000061
Figure BDA0003363834890000062
the normalized hamming distance that is finally obtained is:
Figure BDA0003363834890000063
wherein, ratiofTo normalize Hamming distance, N is the length of the mother code, ciFor the length of the second information (i.e. the anti-code bits of Polar code), LLRiSign (x) is a sign function, and when x is less than or equal to 0, sign (x) is 1, and when x is greater than 0, sign (x) is 0;
Figure BDA0003363834890000064
it can be seen from fig. 2 that Ratio is when there is no signal to transmit or the signal-to-noise Ratio SNR is lowf→ 0.5, Ratio is higher when the signal-to-noise Ratio is higherf→ 0, so Ratio at the time of presence or absence of signal transmission can be usedfAnd judging the DTX state of the signal with obvious discrimination.
Because of the existence of non-ideal factors in the actual system, DTX threshold simulation needs to be performed under different scenesAnd obtaining a DTX threshold Th, thereby carrying out DTX detection. At the time of detection, by ratio ═ 1-ratiofObtaining a DTX decision value, when the ratio is less than or equal to Th, the DTX state is indicated, and when the ratio is more than Th, the non-DTX state is indicated.
It is not difficult to find that the invention mainly utilizes the LLR after de-rate matching and the bit sequence after decoding and de-coding to calculate the normalized 'Hamming' distance, then DTX detection is carried out, the detection quantity has good distinguishing degree at high and low signal-to-noise ratio, and can obtain good detection performance under the condition of meeting the false alarm.
A second embodiment of the present invention relates to a DTX detection apparatus, as shown in fig. 3, including: the first information acquisition module is used for carrying out rate de-matching on the LLR stream output by demodulation to obtain first information; the second information acquisition module is used for decoding and inversely coding 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 judgment value according to the normalized Hamming distance and comparing the DTX judgment value with a preset threshold to realize DTX detection.
Wherein the calculation module passes
Figure BDA0003363834890000065
Obtaining a normalized Hamming distance, wherein ratiofIn order to normalize the hamming distance,
Figure BDA0003363834890000071
n is the length of the mother code, ciFor the length of the second information, LLRiSign (x) is a sign function, and when x is less than or equal to 0, sign (x) is 1, and when x is greater than 0, sign (x) is 0;
Figure BDA0003363834890000072
the detection module passes ratio 1-ratiofObtaining DTX decision valueWherein, ratio is DTX decision value, ratiofNormalized hamming distance.
Therefore, the invention carries out DTX detection based on the normalized Hamming distance of the bit sequence after the decoding rate matching of the LLR stream output by the decoder and the decoding bit sequence is reversely coded, thereby reducing the DTX missing detection rate, reducing the system performance loss caused by DTX detection and improving the system reliability.

Claims (6)

1. A DTX detection method, comprising the steps of:
(1) carrying out rate de-matching on the LLR stream output by demodulation to obtain first information;
(2) decoding and inverse 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 DTX detection.
2. The DTX detection method of claim 1, wherein step (3) is performed by
Figure FDA0003363834880000011
Obtaining a normalized Hamming distance, wherein ratiofIn order to normalize the hamming distance,
Figure FDA0003363834880000012
n is the length of the mother code, ciFor the length of the second information, LLRiSign (x) is a sign function, and when x is less than or equal to 0, sign (x) is 1, and when x is greater than 0, sign (x) is 0;
Figure FDA0003363834880000013
3. the method of claim 1DTX detection method, wherein the passing ratio in step (4) is 1-ratiofObtaining a DTX decision value, wherein ratio is the DTX decision value and ratiofNormalized hamming distance.
4. A DTX detection apparatus, comprising:
the first information acquisition module is used for carrying out rate de-matching on the LLR stream output by demodulation to obtain first information;
the second information acquisition module is used for decoding and inversely coding 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 judgment value according to the normalized Hamming distance and comparing the DTX judgment value with a preset threshold to realize DTX detection.
5. The DTX detection apparatus of claim 4, wherein the calculation module determines the current position by calculating
Figure FDA0003363834880000014
Obtaining a normalized Hamming distance, wherein ratiofIn order to normalize the hamming distance,
Figure FDA0003363834880000015
n is the length of the mother code, ciFor the length of the second information, LLRiSign (x) is a sign function, and when x is less than or equal to 0, sign (x) is 1, and when x is greater than 0, sign (x) is 0;
Figure FDA0003363834880000021
6. the DTX detection apparatus of claim 4, wherein the detection module passes ratio-1-ratiofObtaining a DTX decision value, wherein ratio is DTX decision value, ratiofNormalized hamming distance.
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Citations (5)

* Cited by examiner, † Cited by third party
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
US20150237674A1 (en) * 2014-02-14 2015-08-20 Freescale Semiconductor, Inc. Method of discontinuous transmission detection
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
US20200235864A1 (en) * 2019-01-23 2020-07-23 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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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
US20150237674A1 (en) * 2014-02-14 2015-08-20 Freescale Semiconductor, Inc. Method of discontinuous transmission detection
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
US20200235864A1 (en) * 2019-01-23 2020-07-23 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

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