CN105847199A - Method and device for detecting ACK/NACK state on PUSCH - Google Patents

Method and device for detecting ACK/NACK state on PUSCH Download PDF

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CN105847199A
CN105847199A CN201610157296.7A CN201610157296A CN105847199A CN 105847199 A CN105847199 A CN 105847199A CN 201610157296 A CN201610157296 A CN 201610157296A CN 105847199 A CN105847199 A CN 105847199A
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ack
nack
bit sequence
dtx
user terminal
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CN105847199B (en
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王戈
郭晨
赵旭莹
郭璟
李桓
王晓琴
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Institute of Automation of Chinese Academy of Science
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Institute of Automation of Chinese Academy of Science
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03312—Arrangements specific to the provision of output signals
    • H04L25/03318—Provision of soft decisions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • 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]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

The invention discloses a method and device for detecting the ACK/NACK state on a PUSCH. The method comprises the following steps of: after ACK/NACK decoding is ended, determining whether DTX state detection is carried out or not according to the ACK/NACK information bit number, if DTX state detection is carried out, reconstructing an ACK/NACK bit sequence obtained by decoding through a base station so as to obtain a reconstructed bit sequence, operating the reconstructed bit sequence and a demodulated soft bit sequence so as to obtain a state decision value, comparing the decision value with a pre-set threshold, and determining whether a user terminal sends an ACK/NACK signal or not. By means of the technical scheme, the technical problem how to effectively realize DTX detection when multi-code block and multi-layer transmission is carried out can be solved.

Description

Method and device for detecting ACK/NACK state by PUSCH
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting an ACK/NACK state on a PUSCH channel.
Background
In the LTE (Long Term Evolution) R8 version, Uplink only supports single antenna port transmission, and has a single code block single layer, and PUSCH (Physical Uplink shared channel) has only 1 TB, and 1 layer of data. In the R10 version of LTE, since uplink supports MIMO and carrier aggregation technology, PUSCH can support maximum 4 antenna ports, 2TB4 layer, 5 carrier component transmission, and the R10 version introduces HARQ-ACK multi-code block multi-layer transmission technology compared to the R8 version and the number of transmitted ACK/NACK information bits is also increased from maximum 4 bits of the R8 version to 20 bits. Therefore, the process of HARQ-ACK is also greatly changed.
In order to ensure that a higher data rate is provided for a user and high reliability of communication is guaranteed, an LTE (Long Term Evolution)/LTE-a (LTE-Advanced) communication system introduces an HARQ (Hybrid Automatic Repeat Request) technology. The user terminal detects an error after receiving data transmitted from the base station, and transmits an ACK (Acknowledgement) signal to the base station if the reception is correct, transmits a NACK (Negative Acknowledgement) signal to the base station if the reception is incorrect and exceeds the error correction capability, and does not transmit any information, that is, DTX (discontinuous Transmission) if the user terminal does not obtain the ACK/NACK signal.
And if the base station receives the ACK signal, the base station continues to send the next data packet, and if the base station receives the NACK signal, the base station retransmits the data transmitted last time. Due to the introduction of DTX, the base station needs to detect whether the user terminal transmits an ACK/NACK signal. If the ACK- > DTX (or nack) misjudgment occurs, the correctly received data is retransmitted, which may cause resource waste, and if the DTX- > ACK misjudgment occurs, the base station may consider that the transmitted data is correctly received, and actually, the situation of wrong demodulation may occur, but the base station may not retransmit.
Disclosure of Invention
In view of this, the present application provides a method for detecting an ACK/NACK state in a PUSCH channel, so as to solve the technical problem of how to effectively implement DTX detection in multi-code block multi-layer transmission. In addition, an apparatus for detecting ACK/NACK state on PUSCH channel is also provided.
In order to achieve the above purpose, the following scheme is proposed:
a method for detecting ACK/NACK state by PUSCH channel comprises the following steps:
step 1: judging whether DTX detection is carried out or not according to the number of the ACK/NACK information bits obtained after the ACK/NACK is decoded, if the number of the bits is smaller than or equal to a preset bit threshold value, carrying out DTX state detection on an ACK/NACK bit sequence obtained by demodulation and decoding of a base station, and otherwise, not carrying out DTX state detection;
step 2: reconstructing the ACK/NACK bit sequence obtained by the base station demodulation and decoding to obtain a reconstructed bit sequence;
and step 3: calculating the reconstructed bit sequence and the demodulation soft bit sequence to obtain a DTX state decision value;
and 4, step 4: and comparing the DTX state judgment value with a preset threshold so as to judge whether the user terminal sends an ACK/NACK signal.
In order to achieve the above object, the present application also provides an apparatus for detecting an ACK/NACK state on a PUSCH channel, the apparatus including:
the judging module is used for judging whether DTX detection is carried out according to the number of the ACK/NACK information bits obtained after the ACK/NACK decoding, if the number of the bits is less than or equal to a preset bit threshold value, DTX state detection is carried out on an ACK/NACK bit sequence obtained by the base station demodulation decoding, and otherwise, DTX state detection is not carried out;
a reconstruction module, configured to obtain a reconstructed bit sequence according to the ACK/NACK bit sequence obtained by the decoding;
a decision value calculating module for calculating a DTX state decision value according to the reconstructed bit sequence and the demodulation soft bit sequence;
and the state judgment module is used for comparing the DTX state judgment value with a preset threshold so as to judge whether the user terminal sends an ACK/NACK signal.
According to the method and the device for detecting the ACK/NACK state by the PUSCH, a reconstructed bit sequence is obtained according to an ACK/NACK bit sequence obtained by demodulation and decoding, then a DTX state judgment value is obtained by calculating the reconstructed bit sequence and a demodulation soft bit sequence, and finally the DTX state judgment value is compared with a preset threshold value to judge whether a user terminal sends an ACK/NACK signal. DTX detection of the ACK/NACK signal is effectively achieved. The invention effectively realizes DTX detection during multi-layer transmission of the multi-code block.
Drawings
Fig. 1 is a flowchart of a method for detecting an ACK/NACK state in a PUSCH channel according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an apparatus for detecting an ACK/NACK state in a PUSCH channel according to an embodiment of the present application.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Fig. 1 is a flowchart of a method for detecting an ACK/NACK state in a PUSCH channel according to an embodiment of the present application. The method can comprise the following steps:
step 1: judging whether DTX detection is carried out or not according to the number of ACK/NACK information bits obtained after the ACK/NACK is decoded, if the number of bits is smaller than or equal to a preset bit threshold value, carrying out DTX state detection on an ACK/NACK bit sequence obtained by demodulation and decoding of a base station, otherwise, not carrying out DTX state detection, and outputting ACK/NACK information bits;
step 2: reconstructing the ACK/NACK bit sequence obtained by the base station demodulation and decoding to obtain a reconstructed bit sequence;
and step 3: calculating the reconstructed bit sequence and the demodulation soft bit sequence to obtain a DTX state decision value;
and 4, step 4: and comparing the DTX state judgment value with a preset threshold so as to judge whether the user terminal sends an ACK/NACK signal.
The base station needs to perform DTX detection on the ACK/NACK bit sequence obtained by demodulation and decoding. And after the ACK/NACK decoding is finished, judging whether DTX detection is carried out or not according to the number of the ACK/NACK information bits. When the number of ACK/NACK information bits is greater than 3, the probability of DTX occurrence is small, and therefore the decision criterion for determining whether to perform DTX detection in step 1 is:
if the number of the ACK/NACK information bits is less than or equal to 3, carrying out DTX detection on the ACK/NACK bit sequence obtained by the demodulation and decoding of the base station, otherwise, not carrying out DTX detection.
According to the protocol 3GPP TS 36.212, the process of obtaining the reconstructed bit sequence in step 2 includes channel coding and rate matching, which specifically includes the following steps:
according to the protocol, the number of ACK/NACK information bits is different, and the adopted channel coding mode is also different. It is assumed that the ACK/NACK bit sequence obtained after decoding is represented as:
wherein, OACKThe number of the ACK/NACK information bits.
If the number of the ACK/NACK information bits is 1, the channel coding is as shown in table 1:
TABLE 1
Wherein,is an ACK/NACK information bit.
If the number of the ACK/NACK information bits is 2, the channel coding is as shown in table 2:
TABLE 2
Wherein,for the ACK/NACK information bits,
if the number of the ACK/NACK information bits is 3, RM coding is adopted to obtain a channel coding sequence with the length of 32
After channel coding, carrying out rate matching on the coded sequence through cyclic value taking, and repeatedly coding to ensure that the length of the coded sequence is QACK. In particular, the acquisition of the reconstructed bit sequence described in step 2 does not require layer replication of a single code block.
Wherein QACKLength of ACK/NACK sequence for layer copy without a single code block.
The demodulation soft bit sequence in step 3 is the laminated soft bit information obtained in the decoding process, and is used for calculating the decision value of DTX detection.
In step 3, the specific calculation process for obtaining the DTX state decision value according to the reconstructed bit sequence and the demodulated soft bit sequence is as follows:
assuming that the demodulated soft bit sequence is represented as:the reconstructed bit sequence is represented as:
according to the formulaRecoding the reconstructed ACK/NACK bit sequence to obtain a new bit sequence:
if the number of the ACK/NACK information bits is less than or equal to 2, when the ACK/NACK transmission is in a multiplexing mode, because the user terminal scrambles the y placeholder, the bit value of the y position corresponding to the new bit sequence is the previous position, namelyWhereinSince the user terminal scrambles the x placeholders, so that the modulated symbols are mapped to the outermost layer of the constellation diagram, the new bit sequence should be multiplied by the correlation factor to adjust the bit sequenceAmplitude, where the correlation factor is related to the modulation scheme.
Since the information bits and the y placeholders reflect the positions of the modulated symbols on the constellation diagram, the x placeholder is not considered when calculating the euclidean distance, and when the number of the ACK/NACK information bits is less than or equal to 2, the euclidean distance calculation formula of the reconstructed bit sequence and the demodulated soft bit sequence is as follows:
e u c l i d e a n = s q r t ( Σ i = 0 Q ′ - 1 Σ j = 0 1 ( f a c t o r * h i * Q m + j A C K - s i * Q m + j A C K ) 2 2 * Q ′ ) - - - ( 1 )
wherein Q' is the number of ACK/NACK symbols after each layer of coding specified in the 3GPP TS 36.212 protocol, and QmRepresenting modulation mode, factor representing amplitude adjustment factor, QmAnd the values of the factors are shown in Table 3:
TABLE 3
The Euclidean distance is a DTX state decision value when the number of ACK/NACK information bits is less than or equal to 2.
If the number of the ACK/NACK information bits is 3, the calculation formula of the correlation value of the reconstructed bit sequence and the demodulation soft bit sequence is as follows:
c o r r e l a t i o n = ( Σ i = 0 Q A C K - 1 h i A C K * s i A C K ) / Q A C K - - - ( 2 )
the correlation value is a DTX state decision value when the number of ACK/NACK information bits is equal to 3.
If there are two code blocks, the two code blocks obtain the corresponding decision values of the code blocks respectively according to the method.
Comparing the decision value with a preset threshold in the step 4, and directly feeding back a comparison result when only 1 code block exists; when there are 2 code blocks, the 2 code blocks are compared respectively, and the comparison results are merged.
And when the number of the ACK/NACK information bits is less than or equal to 2, if the user terminal sends an ACK/NACK signal, the demodulated soft information in the step 3 is effective soft information. Therefore, the reconstructed bit sequence after amplitude adjustment is close to the demodulation soft information, that is, the euclidean distance obtained according to the formula (1) is smaller. If the user terminal is DTX, the difference between the reconstructed bit sequence after amplitude adjustment and the demodulated soft information is large, that is, the euclidean distance obtained according to the formula (1) is large.
When the number of the ACK/NACK information bits is 3, if the user terminal sends an ACK/NACK signal, the demodulated soft information in step 3 is valid soft information. Thus passing throughAnd (3) if the position symbol of the new sequence obtained by re-encoding is the same as that of the demodulated soft information, the correlation value obtained according to the formula (2) is larger. If the user terminal is DTX, passAnd if the position symbol of the new sequence obtained by re-encoding is different from the position symbol of the demodulation soft information part, the correlation value obtained according to the formula (2) is smaller.
Based on the analysis, if only 1 code block exists, when the number of ACK/NACK information bits is less than or equal to 2, if the judgment value is less than a preset threshold, the user terminal is judged to send an ACK/NACK signal, and if not, the user terminal is judged to be DTX; and when the number of the ACK/NACK information bits is equal to 3, if the judgment value is larger than a preset threshold, judging that the user terminal sends an ACK/NACK signal, otherwise, judging that the signal is DTX.
When 2 code blocks are used for DTX detection, if the two code blocks judge that the user terminal sends an ACK/NACK signal, the user terminal sends the ACK/NACK signal; if the two code blocks judge that the user terminal is DTX, the user terminal is judged to be DTX; and if one code block judges that the user terminal sends the ACK/NACK signal and the other code block judges that the user terminal is DTX, carrying out normalized combination on the judgment values of the two code blocks and a preset threshold, and judging the state of the final user according to a combination result. According to the judgment criterion, calculating the sum of the normalized difference values of the judgment values on the two code blocks and a preset threshold to obtain a judgment factor, wherein the method comprises the following steps:
R a t i o = Σ i = 1 2 v a l u e [ i ] - t h r e s h o l d [ i ] t h r e s h o l d [ i ] - - - ( 3 )
wherein, value [ i ] is the ith code block decision value, and threshold [ i ] is the ith code block preset threshold.
If 2 code blocks exist, when the number of ACK/NACK information bits is less than or equal to 2, if the decision factor Ratio is less than 0, determining that the user terminal sends an ACK/NACK signal, otherwise, determining that the user terminal is DTX; and when the number of the ACK/NACK information bits is equal to 3, if the decision factor Ratio is greater than 0, determining that the user terminal sends an ACK/NACK signal, otherwise, determining that the ACK/NACK signal is DTX.
The invention also provides a device 20 for detecting ACK/NACK of PUSCH channel DTX, and the structural diagram of the embodiment is shown in fig. 2, which includes a determining module 21, a reconstructing module 22, a decision value calculating module 23, and a state deciding module 24. The judging module 21 is configured to judge whether the base station needs to perform DTX detection on the ACK/NACK bit sequence obtained by demodulation and decoding, and perform DTX detection on the ACK/NACK bit sequence obtained by decoding when the number of ACK/NACK information bits is less than or equal to 3; the reconstruction module 22 obtains a reconstruction bit sequence according to the protocol 3GPP TS 36.212; the decision value calculating module 23 obtains a decision value by calculating the euclidean distance between two sequences when the number of the ACK/NACK information bits is less than or equal to 2, and obtains a decision value by calculating the correlation value between two sequences when the number of the ACK/NACK information bits is equal to 3, according to the reconstructed bit sequence and the demodulated soft bit sequence; the state decision module 24 decides whether the user terminal sends an ACK/NACK signal by comparing the decision value with a threshold value, and directly feeds back the comparison result when only 1 code block exists; when there are 2 code blocks, the 2 code blocks are compared respectively, and the comparison results are merged, and the specific decision criterion is described with reference to the detection method embodiment.
The reconstruction module comprises a channel coding module and a rate matching module, wherein the rate matching module does not need layer replication of a single code block.
The decision value calculating module is further configured to: when the bit number of the ACK/NACK information is less than or equal to 2, carrying out amplitude adjustment on the reconstructed bit sequence according to a modulation mode, and then calculating the Euclidean distance between the reconstructed bit sequence and the demodulation soft bit sequence to be used as a DTX state decision value; and when the number of the ACK/NACK information bits is 3, obtaining the DTX state decision value by calculating the correlation value of the reconstructed bit sequence and the demodulation soft bit sequence.
The state decision module is further configured to: comparing the DTX state judgment value with a preset threshold to judge whether the user terminal sends the ACK/NACK signal or not; when only 1 code block exists, the comparison result is directly fed back; and when 2 code blocks exist, comparing the 2 code blocks respectively, and merging comparison results.
The state decision module is further configured to determine that the user terminal sends the ACK/NACK signal if both code blocks determine that the user terminal sends the ACK/NACK signal; if the user terminal is judged to be DTX by the two code blocks, the user terminal is judged to be DTX; and if one code block judges that the user terminal sends the ACK/NACK signal and the other code block judges that the user terminal is DTX, carrying out normalized combination on the judgment values of the two code blocks and a preset threshold, and judging the state of the final user according to a combination result.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A method for detecting ACK/NACK state on PUSCH channel is characterized by comprising the following steps:
step 1: judging whether DTX detection is carried out or not according to the number of ACK/NACK information bits obtained after the ACK/NACK is decoded, if the number of bits is smaller than or equal to a preset bit threshold value, carrying out DTX state detection on an ACK/NACK bit sequence obtained by demodulation and decoding of a base station, otherwise, not carrying out DTX state detection, and outputting ACK/NACK information bits;
step 2: reconstructing the ACK/NACK bit sequence obtained by the base station demodulation and decoding to obtain a reconstructed bit sequence;
and step 3: calculating the reconstructed bit sequence and the demodulation soft bit sequence to obtain a DTX state decision value;
and 4, step 4: and comparing the DTX state judgment value with a preset threshold so as to judge whether the user terminal sends an ACK/NACK signal.
2. The method of claim 1, wherein the bit sequence reconstruction process of step 2 specifically comprises channel coding and rate matching, and wherein the rate matching process does not require layer replication of a single code block.
3. The method of claim 1, wherein the soft bit sequence for demodulation in step 3 is a layer-merged soft bit information obtained in a decoding process.
4. The method of claim 1, wherein the method of obtaining the DTX state decision value in step 3 is as follows: when the bit number of the ACK/NACK information is less than or equal to 2, carrying out amplitude adjustment on the reconstructed bit sequence according to a modulation mode, and then calculating the Euclidean distance between the reconstructed bit sequence and the demodulation soft bit sequence to be used as a DTX state decision value;
and when the number of the ACK/NACK information bits is 3, obtaining a DTX state decision value by calculating the correlation value of the reconstructed bit sequence and the demodulation soft bit sequence.
5. The method of claim 1, wherein when the DTX state decision value in step 4 is compared with a preset threshold and there are only 1 code blocks, the comparison result is fed back directly; and when 2 code blocks exist, comparing the 2 code blocks respectively, and merging comparison results.
6. The method of claim 5, wherein when there are 2 code blocks, comparing the 2 code blocks respectively, and combining the comparison results comprises: if the two code blocks both judge that the user terminal sends the ACK/NACK signal, judging that the user terminal sends the ACK/NACK signal; if the user terminal is judged to be DTX by the two code blocks, the user terminal is judged to be DTX; and if one code block judges that the user terminal sends the ACK/NACK signal and the other code block judges that the user terminal is DTX, carrying out normalized combination on the judgment values of the two code blocks and a preset threshold, and judging the state of the final user according to a combination result.
7. An apparatus for ACK/NACK status detection on a PUSCH channel, the apparatus comprising:
the judging module is used for judging whether DTX detection is carried out according to the number of the ACK/NACK information bits obtained after the ACK/NACK decoding, if the number of the bits is less than or equal to a preset bit threshold value, DTX state detection is carried out on an ACK/NACK bit sequence obtained by the base station demodulation decoding, and otherwise, DTX state detection is not carried out;
a reconstruction module, configured to obtain a reconstructed bit sequence according to the ACK/NACK bit sequence obtained by the decoding;
a decision value calculating module for calculating a DTX state decision value according to the reconstructed bit sequence and the demodulation soft bit sequence;
and the state judgment module is used for comparing the DTX state judgment value with a preset threshold so as to judge whether the user terminal sends an ACK/NACK signal.
8. The apparatus of claim 7, wherein the reconstructing module comprises a channel coding module and a rate matching module, and wherein the rate matching module does not need layer replication of a single code block.
9. The apparatus for ACK/NACK state detection on PUSCH channel according to claim 7, wherein the decision value calculation module is further configured to:
when the bit number of the ACK/NACK information is less than or equal to 2, carrying out amplitude adjustment on the reconstructed bit sequence according to a modulation mode, and then calculating the Euclidean distance between the reconstructed bit sequence and the demodulation soft bit sequence to be used as a DTX state decision value;
and when the number of the ACK/NACK information bits is 3, obtaining the DTX state decision value by calculating the correlation value of the reconstructed bit sequence and the demodulation soft bit sequence.
10. The apparatus for ACK/NACK state detection on PUSCH channel according to claim 7, wherein the state decision module is further configured to:
comparing the DTX state judgment value with a preset threshold to judge whether the user terminal sends the ACK/NACK signal or not; when only 1 code block exists, the comparison result is directly fed back; and when 2 code blocks exist, comparing the 2 code blocks respectively, and merging comparison results.
11. The apparatus for ACK/NACK state detection on PUSCH channel according to claim 10, wherein the state decision module is further configured to: if the two code blocks both judge that the user terminal sends the ACK/NACK signal, judging that the user terminal sends the ACK/NACK signal; if the user terminal is judged to be DTX by the two code blocks, the user terminal is judged to be DTX; and if one code block judges that the user terminal sends the ACK/NACK signal and the other code block judges that the user terminal is DTX, carrying out normalized combination on the judgment values of the two code blocks and a preset threshold, and judging the state of the final user according to a combination result.
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CN104168095A (en) * 2014-08-15 2014-11-26 北京北方烽火科技有限公司 Non-continuity transmission detection method and device

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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
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US11611987B2 (en) 2021-01-05 2023-03-21 Hong Kong Applied Science And Technology Research Institute Co., Ltd Method and device for detecting partial discontinuous transmission (DTX) using soft bits correlation
CN114126094A (en) * 2021-11-02 2022-03-01 锐捷网络股份有限公司 DTX (discontinuous Transmission) judgment method and device
CN114126094B (en) * 2021-11-02 2024-07-19 锐捷网络股份有限公司 DTX judgment method and device
WO2023159658A1 (en) * 2022-02-25 2023-08-31 Hong Kong Applied Science and Technology Research Institute Company Limited A method and device for detecting partial discontinuous transmission (dtx) using bits reconstruction

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