CN114126094B - DTX judgment method and device - Google Patents

DTX judgment method and device Download PDF

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Publication number
CN114126094B
CN114126094B CN202111290348.5A CN202111290348A CN114126094B CN 114126094 B CN114126094 B CN 114126094B CN 202111290348 A CN202111290348 A CN 202111290348A CN 114126094 B CN114126094 B CN 114126094B
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matrix
sequence
coding
mask
value
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CN114126094A (en
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钟绿阳
王大飞
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Ruijie Networks Co Ltd
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Ruijie Networks Co Ltd
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    • 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]
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

The embodiment of the application provides a DTX judgment method and device, which are used for solving the problems that in the prior art, the DTX judgment has higher requirements on the performance of a receiving end and the accuracy of a result is lower. The method comprises the following steps: demodulating the received selected signal subjected to the Reed-Muller RM coding to obtain a first Log Likelihood Ratio (LLR) sequence with a fixed sequence length; according to the appointed data quantity of the selected signal before the RM coding and a first threshold corresponding to the RM coding, hadamard transformation is carried out on the first LLR sequence, and a first intermediate sequence with the fixed sequence length is obtained; calculating a first measure value according to a first selected element with the largest absolute value in the first intermediate sequence and all elements in the first intermediate sequence; and discontinuous transmission DTX judgment is carried out on the selected signal according to the first measure value and the second threshold value.

Description

DTX judgment method and device
Technical Field
The embodiment of the application relates to the field of wireless communication, in particular to a method and a device for judging DTX.
Background
In the fifth generation mobile communication technology (5th Generation Mobile Communication Technology,5G) New Radio (NR) system, the signal may not contain valid information due to some special reasons during the signal transmission and reception, for example, the information may not be received correctly due to poor link condition, or the receiving end may not receive feedback due to offline of the transmitting end. Therefore, the receiving end of the signal needs to make discontinuous transmission (discontinuous transmission, DTX) decision on the received signal, so as to determine whether the signal received by the current receiving end contains valid information. If the signal contains valid information, the non-DTX state is determined, and if the signal does not contain valid information, the DTX state is determined.
However, the current DTX decision method mainly adopts a signal-to-noise ratio estimation method to make DTX decision. The method needs to count the signal-to-noise ratio of a sample signal without effective information in advance, and obtain a threshold value of DTX decision from the statistical data. And then, after the receiving end receives the signal, carrying out DTX judgment on the signal according to the relation between the signal-to-noise ratio of the received signal and the threshold value.
However, the method has high noise estimation performance requirements on the receiving end and is easily influenced by factors such as time offset, allocated resource number and the like, so that the accuracy of DTX judgment is low.
Disclosure of Invention
The embodiment of the application provides a DTX judgment method and device, which are used for solving the problems that in the prior art, the DTX judgment has higher requirements on the performance of a receiving end and the accuracy of a result is lower.
In a first aspect, the present application provides a method for DTX decision, applied to a signal receiving end, including: demodulating the received selected signal after RM coding to obtain a first LLR sequence with a fixed sequence length; according to the appointed data quantity of the selected signal before the RM coding and a first threshold corresponding to the RM coding, hadamard transformation is carried out on the first LLR sequence, and a first intermediate sequence with the fixed sequence length is obtained; calculating a first measure value according to a first selected element with the largest absolute value in the first intermediate sequence and all elements in the first intermediate sequence; and carrying out DTX judgment on the selected signal according to the first measure value and the second threshold value.
In the scheme, the receiving end carries out DTX judgment on the received selected signal by acquiring the Hadamard transformation result in the process of decoding the selected signal, so that the influence of the problems of signal to noise ratio, time offset and the like is avoided, and only partial decoding result in the decoding process is used for carrying out DTX judgment, thereby reducing the requirement of the DTX judgment on the performance of the receiving end and improving the accuracy of the DTX judgment. Meanwhile, a first measurement value is calculated by adopting a first selected element and all elements in the Hadamard transformation result, so that the influence of excessive dispersion of values on the accuracy of DTX judgment is avoided. In addition, the scheme can be applied to DTX decision of all signals subjected to RM coding, and has higher universality.
Optionally, according to a first threshold value corresponding to the RM code of the agreed data amount of the selected signal before the RM code, performing hadamard transformation on the first LLR sequence to obtain a first intermediate sequence with the fixed sequence length, which specifically includes: determining whether the agreed data volume of the selected signal before being subjected to the RM coding is larger than a first threshold corresponding to the RM coding; if the agreed data quantity is less than or equal to the first threshold value, hadamard transformation is carried out on the first LLR sequence to obtain the first intermediate sequence; and if the agreed data quantity is determined to be larger than the first threshold value, performing mask removal calculation according to the agreed data quantity and the first LLR sequence to obtain a mask removal matrix, performing Hadamard transform on the mask removal matrix to obtain a first intermediate matrix, and obtaining all elements in a column where a second selected element with the largest absolute value in the first intermediate matrix is located to form the first intermediate sequence.
In the mode, the first intermediate sequence can be obtained by the selected signals with different data volumes through different modes, so that the application range of the scheme is improved; meanwhile, the Hadamard transform is used for obtaining the first intermediate sequence from the first LLR sequence, so that the calculation complexity in DTX judgment can be effectively reduced.
Optionally, performing a mask removal calculation according to the agreed data amount and the first LLR sequence to obtain the mask removal matrix, which specifically includes: calculating a mask matrix used by RM coding according to the agreed data quantity and the first threshold value; calculating a second intermediate matrix after the mask matrix is coded according to the mask matrix and a preset coding matrix; the divide mask matrix is calculated from the second intermediate matrix and the first sequence of LLRs.
By the method, the mask dividing matrix of the selected signal is obtained through calculation, the influence of incomplete orthogonality of the mask matrix on the overall bit distribution during RM coding is avoided, and the accuracy of DTX judgment is improved.
Optionally, calculating the second intermediate matrix after the mask matrix is coded according to the mask matrix and a preset coding matrix specifically includes: acquiring the preset coding matrix, and multiplying the coding matrix by the mask matrix to obtain a third intermediate matrix; and taking remainder of all elements in the third intermediate matrix for 2, and subtracting each remainder of 2 times by 1 to obtain all element values of the second intermediate matrix.
Optionally, calculating a first measure value according to the first selected element with the largest absolute value in the first intermediate sequence and all elements in the first intermediate sequence includes: calculating the sum of absolute values of all elements in the first intermediate sequence; calculating a difference between the sum of the absolute values and the absolute value of the first selected element; comparing the absolute value of the first selected element with the difference value to obtain the first measure value.
In this way, the sum of the absolute values of all the elements except the first selected element in the first intermediate sequence is used as the normalization operator, so that the problem that the accuracy of DTX decision is affected due to excessive dispersion of the absolute values can be avoided. And the normalization operation is carried out on the first selected element, so that the convenience of comparison in the subsequent process is improved. Meanwhile, all data required by calculating the first parameter come from the Hadamard transform result in the decoding process, so that interference of factors such as signal to noise ratio and the like can be effectively avoided, and the accuracy of DTX judgment is improved.
Optionally, performing DTX decision on the selected signal according to the first measure value and the second threshold, which specifically includes: determining whether the first measure is greater than the second threshold; if the first measure value is less than or equal to the second threshold value, judging that the selected signal is in a non-DTX state; and if the first measure value is determined to be larger than the second threshold value, judging that the selected signal is in a DTX state.
Optionally, demodulating at least one sample signal containing only noise to obtain a second LLR sequence having the fixed sequence length; respectively carrying out Hadamard transform on each second LLR sequence to obtain a second intermediate sequence with the fixed sequence length; calculating a second measure value according to the element with the largest absolute value in each second intermediate sequence and all elements in the corresponding second intermediate sequence; the second threshold value is determined from the respective second measure value.
By the method, the threshold value is determined according to the sample signals with known DTX states, so that the accuracy of DTX judgment can be improved.
In a second aspect, the present application provides an apparatus for DTX decision, applied to a signal receiving end, including:
The acquisition unit is used for demodulating the received selected signal after RM coding to obtain a first LLR sequence with a fixed sequence length; the computing unit is used for carrying out Hadamard transform on the first LLR sequence according to a first threshold value corresponding to the RM code and the agreed data quantity of the selected signal before the RM code so as to obtain a first intermediate sequence with the fixed sequence length; a processing unit, configured to calculate a first measure value according to a first selected element with the largest absolute value in the first intermediate sequence and all elements in the first intermediate sequence; and the judging unit is used for carrying out DTX judgment on the selected signal according to the first measure value and the second threshold value.
Optionally, the calculating unit performs hadamard transformation on the first LLR sequence according to a first threshold value corresponding to the RM code of the agreed data amount of the selected signal before the RM code, so as to obtain a first intermediate sequence with the fixed sequence length, which is specifically configured to: determining whether the agreed data volume of the selected signal before being subjected to the RM coding is larger than a first threshold corresponding to the RM coding; if the agreed data quantity is less than or equal to the first threshold value, hadamard transformation is carried out on the first LLR sequence to obtain the first intermediate sequence; and if the agreed data quantity is determined to be larger than the first threshold value, performing mask removal calculation according to the agreed data quantity and the first LLR sequence to obtain a mask removal matrix, performing Hadamard transform on the mask removal matrix to obtain a first intermediate matrix, and obtaining all elements in a column where a second selected element with the largest absolute value in the first intermediate matrix is located to form the first intermediate sequence.
Optionally, when the computing unit performs a mask removal calculation according to the agreed data amount and the first LLR sequence to obtain the mask removal matrix, the computing unit is specifically configured to: calculating a mask matrix used by RM coding according to the agreed data quantity and the first threshold value; calculating a second intermediate matrix after the mask matrix is coded according to the mask matrix and a preset coding matrix; the divide mask matrix is calculated from the second intermediate matrix and the first sequence of LLRs.
Optionally, the calculating unit is specifically configured to, when calculating the second intermediate matrix after the mask matrix is encoded according to the mask matrix and a preset encoding matrix: acquiring the preset coding matrix, and multiplying the coding matrix by the mask matrix to obtain a third intermediate matrix; and taking remainder of all elements in the third intermediate matrix for 2, and subtracting each remainder of 2 times by 1 to obtain all element values of the second intermediate matrix.
Optionally, the processing unit is configured to, when calculating the first measure value according to the first selected element and all elements in the first intermediate sequence: calculating the sum of absolute values of all elements in the first intermediate sequence; calculating a difference between the sum of the absolute values and the absolute value of the first selected element; comparing the absolute value of the first selected element with the difference value to obtain the first measure value.
Optionally, the decision unit performs DTX decision on the selected signal according to the first measure value and the second threshold, specifically for: determining whether the first measure is greater than the second threshold; if the first measure value is less than or equal to the second threshold value, judging that the selected signal is in a non-DTX state; and if the first measure value is determined to be larger than the second threshold value, judging that the selected signal is in a DTX state.
Optionally, the obtaining unit is further configured to demodulate at least one sample signal only containing noise to obtain a second LLR sequence with the fixed sequence length; the computing unit is further used for respectively carrying out Hadamard transform on each second LLR sequence to obtain a second intermediate sequence with the fixed sequence length; the processing unit is further used for calculating a second measure value according to the element with the largest absolute value in each second intermediate sequence and all elements in the corresponding second intermediate sequence; the decision unit is further adapted to determine the second threshold value based on the respective second measure value.
In a third aspect, there is provided a communication apparatus comprising: at least one processor; and a memory communicatively coupled to the at least one processor, a communication interface; wherein the memory stores instructions executable by the at least one processor, by executing the instructions stored by the memory, causing the apparatus to perform any one of the methods as provided in the first aspect via the communication interface.
In a fourth aspect, there is provided a computer readable storage medium for storing instructions that, when executed, cause a method as any one provided in the first aspect to be implemented.
Technical effects or advantages of one or more of the second, third, and fourth aspects of the embodiments of the present application may be explained correspondingly by technical effects or advantages of one or more of the corresponding aspects of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a network architecture diagram of a communication system to which embodiments of the present application are applicable;
fig. 2 is a flowchart of a method for DTX decision provided by an embodiment of the present application;
Fig. 3 is a block diagram of an apparatus for DTX decision according to an embodiment of the present application;
Fig. 4 is a block diagram of a communication device according to an embodiment of the present application.
Detailed Description
The following detailed description of the technical solutions of the present invention will be given by way of the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and not limiting the technical solutions of the present invention, and that the embodiments and technical features of the embodiments of the present invention may be combined with each other without conflict.
It should be appreciated that in the description of embodiments of the invention, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not for indicating or implying any relative importance or order. In the description of the embodiments of the present invention, "plurality" means two or more.
The term "and/or" in the embodiment of the present invention is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
The embodiment of the application can be applied to a 5G system; it is also applicable to other wireless communication systems such as long term evolution (Long Term Evolution, LTE) systems, global system for mobile communications (Global System for Mobile Communication, GSM), mobile communication systems (Universal Mobile Telecommunications System, UMTS), code division multiple access (Code Division Multiple Access, CDMA) systems, terminal-to-terminal (D2D) systems, car-to-everything (V2X) systems, and other future possible communication systems, etc. The technical scheme of the embodiment of the application can be adopted as long as the DTX judgment requirement exists in the system.
For example, fig. 1 illustrates a network architecture diagram of one possible communication system, including a network device and a terminal device, to which embodiments of the present application are applicable.
Wherein the terminal device, which may also be referred to as a terminal, is also referred to as user equipment UE. May be a device that provides voice and/or data connectivity to a user, a handheld device with wireless connectivity, or other processing device connected to a wireless modem. The wireless user equipment may communicate with one or more core networks via a radio access network (Radio Access Network, RAN), which may be mobile terminals such as mobile phones (or "cellular" phones) and computers with mobile terminals, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access network. Such as Personal communication services (Personal Communication Service, PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal DIGITAL ASSISTANT, PDA) and the like. The wireless User equipment may also be referred to as a system, subscriber Unit (Subscriber Unit), subscriber Station (Subscriber Station), mobile Station (Mobile Station), mobile Station (Mobile), remote Station (Remote Station), access Point (Access Point), remote Terminal (Remote Terminal), access Terminal (ACCESS TERMINAL), user Terminal (User Terminal), user Agent (User Agent), user Device (User equipment).
Network devices, including, for example, access Network (AN) devices, radio access network (radio access network, RAN) devices, access network devices, such as base stations (e.g., access points), may refer to devices in AN access network that communicate over the air with wireless terminal devices through one or more cells. The base station may be configured to inter-convert the received air frames with Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB or eNB or e-NodeB, evolved Node B) in an LTE system or long term evolution advanced (long term evolution-advanced, LTE-a), or may also include a next generation Node B (next generation Node B, gNB) or next generation evolved base station (next generation evolved nodeB, ng-eNB), en-gNB (enhanced next generation Node B, gNB) in a 5G NR system: enhanced next generation base stations; centralized units (centralized unit, CUs) and Distributed Units (DUs) in a Cloud access network (Cloud radio access network, cloud RAN) system may also be included, or relay devices may also be included, and embodiments of the present application are not limited.
In the scenario shown in fig. 1, the network device and the terminal device may communicate with each other, e.g. the network device sends a downlink signal, the terminal receives the downlink signal, or the terminal device sends an uplink signal, and the network device receives the uplink signal. It should be understood that in practical application, the number of network devices and the number of terminal devices are not limited to 1; in addition, the network devices may also communicate with each other, and the terminal devices may also communicate with each other, which is not limited by the present application. In practical application of the embodiment of the application, the signal receiving end can be either network equipment or terminal equipment. The signal for making DTX decision may be either an uplink control information (Uplink Control Information, UCI) signal or a downlink control information (Downlink Control Information, DCI) signal or other Reed Muller (RM) encoded signal.
For convenience of explanation, as shown in fig. 1, in the present application, the steps of implementing the DTX decision method provided in the embodiment of the present application will be explained by taking, as an example, UCI signals that are transmitted by a physical uplink control channel (Physical Uplink Control Channel, PUCCH) and are RM-encoded. It should be understood that, in practical application, the method provided by the embodiment of the present application may also be applied to UCI signals that are carried and transmitted by a Physical Uplink shared channel (Physical Uplink SHARE CHANNEL, PUSCH).
In order to ensure reliability of data transmission, a communication system as shown in fig. 1 may support hybrid automatic repeat request (HARQ). Taking downlink data transmission as an example: when the network device sends a downlink data packet to the terminal device, the terminal device may feed back acknowledgement/negative acknowledgement (ACK/NACK) information of the downlink channel through the PUCCH, and if the terminal device correctly receives the downlink data packet, the terminal device may feed back Acknowledgement (ACK), and if the terminal device does not correctly receive the downlink data packet, the terminal device may feed back Negative Acknowledgement (NACK). However, in some cases, for example, the terminal device cannot decode the downlink data packet correctly, the terminal device will consider that the network device does not allocate resources to the terminal device, will not feedback ACK/NACK information, or will send ACK/NACK information on the wrong resource, in which case the network device will not receive ACK/NACK feedback information on the corresponding resource, and the terminal device may be considered to be in DTX state.
Therefore, the network device needs to perform DTX decision on the received signal to determine whether the terminal device transmits ACK/NACK information, and only after determining that the terminal device transmits ACK/NACK information, the network device receives ACK/NACK. The UCI sent by the PUCCH bearer contains the indication information of ACK/NACK, so the network device may determine whether the terminal device sends ACK/NACK information by determining whether the UCI exists in the PUCCH, that is, whether the terminal device is in a DTX state (the terminal device does not send NACK/ACK when the terminal device is in a DTX state, and otherwise, the terminal device sends NACK/ACK when the terminal device is not in a DTX state).
Currently, the network device performs DTX decisions, typically based on the signal-to-noise ratio of the received signal. However, in such a decision process, there are problems of high requirements on performance of the receiving end and low decision accuracy.
In view of this, the present application provides a method for performing DTX decision on the above signal, which is performed by the signal receiving end. The receiving end may be a receiving end of NACK/ACK in uplink transmission, i.e. a network device; or a receiving end of NACK/ACK in downlink transmission, namely terminal equipment; and the application is not limited, and the application can also be a receiving end of NACK/ACK when the terminal devices communicate with each other.
In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 2, a flowchart of a method for DTX decision is provided for an embodiment of the present application, including:
S201: demodulating the received RM-encoded selected signal to obtain a first Log-Likelihood Ratio (LLR) sequence having a fixed sequence length.
Specifically, a UCI signal of 3 to 11 bits in a 5G NR system is taken as an example. When the transmitting end transmits signals, the signals need to be subjected to channel coding, so that the reliability in the signal transmission process is improved. And when the UCI signals with 3-11 bits are transmitted, the transmitting end usually selects an RM coding mode to code the UCI signals. After the signal is coded, a code stream with a fixed data quantity is obtained and sent to a receiving end. Optionally, in the embodiment of the present application, the fixed data size after RM encoding is 32 bits, and it should be understood that other fixed data size bits obtained by RM encoding that may occur in the future are also applicable to the scheme proposed by the present application.
The signals after RM coding are subjected to rate matching at a transmitting end and are transmitted to a receiving end; after the receiving end performs rate de-matching on the received signal, a first LLR sequence can be obtained.
The specific process of de-rate matching at the receiving end is as follows:
the receiving end firstly acquires original LLR sequences with different sequence lengths: sequence F. The sequence F is divided into two cases according to the sequence length: case 1, sequence length less than or equal to 32; case 2, sequence length greater than 32.
At this time, the sequence F needs to be processed to obtain a first LLR sequence with a fixed sequence length: sequence D. The specific treatment process is as follows:
Setting a sequence F= [ F 0,f1,…,fE-1 ], wherein E is the length of the sequence F, and E is an integer; let the sequence d= [ D 0,d1,…,dN-1 ], where N is the length of the sequence D and N is an integer. Alternatively, in the embodiment of the present application, n=32 due to the characteristics of RM coding. So that the number of the parts to be processed,
When E is less than or equal to 32, the corresponding relation between the element values in the sequence D and the element values in the sequence F is as follows:
when E >32, the correspondence between the element values in sequence D and the element values in sequence F is:
Wherein i and k are sequence values, and are integers.
By the above method, after processing the sequence F with the sequence length not fixed, a first LLR sequence with the sequence length fixed as N can be obtained: sequence D.
S202: and carrying out Hadamard transform on the first LLR sequence according to the appointed data quantity of the selected signal before RM coding and a first threshold corresponding to RM coding, so as to obtain a first intermediate sequence with a fixed sequence length.
In one possible implementation, the data amounts of the selected signals to be transmitted, which are agreed by the transmitting end and the receiving end, may be different, and the receiving end needs to use different processing manners for the first LLR sequence according to the different agreed data amounts.
Specifically, before the signal is selected to be sent, the sending end and the receiving end can agree on the data size of the signal to be sent. And the receiving end judges the relationship between the appointed data volume of the received signal and the first threshold value through the appointed data volume. Alternatively, the first threshold may be set to 6 bits, depending on the nature of the RM code. Illustrating: the transmitting end and the receiving end agree to transmit a UCI signal of 5 bits at the time T1 or transmit a UCI signal of 7 bits at the time T2, and the receiving end receives the UCI signal at the time T1 and judges according to the 5 bits agreed with the transmitting end and a first threshold (6 bits).
If the agreed data quantity is smaller than or equal to a first threshold value, hadamard transform is carried out on the first LLR sequence to obtain a first intermediate sequence;
If the agreed data quantity is confirmed to be larger than the first threshold value, performing mask removal calculation according to the agreed data quantity and the first LLR sequence to obtain a mask removal matrix, performing Hadamard transform on the mask removal matrix to obtain a first intermediate matrix, and obtaining all elements in a column where a second selected element with the largest absolute value in the first intermediate matrix is located to form the first intermediate sequence.
For example, when the receiving end determines that the data size of the UCI signal is less than or equal to 6 bits, the receiving end directly performs hadamard transformation on the sequence D, and obtains a first intermediate sequence according to the result of the hadamard transformation.
The Hadamard transform is a transform means used by a receiving end in RM decoding of a selected signal. The method provided by the embodiment of the application can utilize partial results in the signal decoding process to carry out DTX judgment on the signal, thereby effectively reducing the complexity of DTX judgment.
When the receiving end determines that the data size of the UCI signal is larger than 6 bits, the receiving end needs to perform mask removal calculation according to the sequence D to obtain a mask removal matrix, perform Hadamard transform on the mask removal matrix to obtain a first intermediate matrix, and acquire all elements in a column where a second selected element with the largest absolute value in the first intermediate matrix is located to form a first intermediate sequence.
In the RM coding process of the sending end on the selected signal, the matrix adopted in the coding is divided into two parts, wherein one part is the first 6-bit coding matrix, the other part is the mask matrix of the last 5 bits, and the other part is not completely orthogonal. The incompletely orthogonal part affects the decoding result when the receiving end decodes the signal, so the receiving end needs to encode all bits and then calculate the correlation value between the bits and the original code, thereby finding out the bit sequence with the maximum correlation. This process is the demask process.
Optionally, the specific dividing mask matrix calculation process is as follows:
first, a mask matrix used for RM coding is calculated based on the agreed data amount and a first threshold.
Specifically, let the information bit obtained after the selected signal is completely decoded be c= [ C 0,c1,…,cK-1 ], where K is the length of the decoded information bit. Taking the selected signal sent by the sending end as an example, the UCI signal is taken as an example, and the information bit obtained after the UCI signal is completely decoded is that the length K is the same as the value of the appointed data volume of the UCI which is not coded.
Let the number of divide mask bits be K mask:
Wherein, the number 6 in the formula 3 is the first threshold.
Let the mask matrix used for RM coding be: matrix C mask of the size of
Is provided withIs the K mask -bit binary column vector of the K-th column of matrix C mask, whereThe value representing the i-th bit in the binary number. Then:
where dec2bin (K) represents a binary number column vector that converts a decimal number to K mask bits.
Through the above process, the mask matrix C mask used for RM encoding can be obtained by calculation.
And secondly, calculating a second intermediate matrix after the mask matrix is coded according to the mask matrix and a preset coding matrix.
Alternatively, the predetermined coding matrix may be obtained according to [ M i,6,Mi,7,Mi,8,Mi,9,Mi,10 ] in Table5.3.3.3-1 in 3GPP protocol 38.212. Let the coding matrix be the matrix G mask, then the matrix G mask =
[0,0,1,0,0,1,1,0,0,1,1,1,0,0,0,1,1,0,1,1,1,0,0,0,1,1,0,0,1,1,1,0;0,0,0,0,1,1,0,1,1,0,1,0,1,1,1,1,0,0,1,0,0,0,1,0,1,1,0,1,0,1,1,0;0,0,1,1,0,1,1,1,0,0,0,1,1,0,0,0,0,1,0,0,0,0,1,1,1,0,1,1,1,1,1,0;0,1,1,0,0,0,1,0,1,1,1,0,1,1,0,1,1,0,0,0,0,1,0,1,1,0,1,1,0,0,1,0;1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,0,1,0,0,0,0,1,0]T
Let the second intermediate matrix be matrix D mask, its size isThe second intermediate matrix satisfies the following relationship with the mask matrix and the preset encoding matrix:
D mask＝1-2(GmaskCmask mod 2) (equation 5)
Specifically, the code matrix G mask is multiplied by the mask matrix C mask to obtain a third matrix;
taking the remainder of all elements in the third matrix for 2 and subtracting 2 times the remainder from 1; all the elements obtained are all the element values of the second intermediate matrix.
Through the above process, the second intermediate matrix can be calculated.
Finally, a divide mask matrix is calculated based on the second intermediate matrix and the first sequence of LLRs.
Let the division mask matrix be matrix D demask, its size isThe correspondence of each element in the division mask matrix with each element in the second intermediate matrix and the first sequence of LLRs is:
Wherein, Elements representing the j-th column of the i-th row of matrix D demask,Represents the ith row and jth column element of matrix D mask, and D i represents the ith element of sequence D (i.e., the first sequence described above).
Through the above process, the receiving end calculates to obtain the division mask matrix D demask.
At this time, the receiving end further needs to process the demask matrix D demask to obtain a corresponding first intermediate sequence. The treatment process is as follows:
Setting a vector Is the kth column vector of the divide mask matrix D demask, where,
VectorCarrying out Hadamard transformation to obtain a Hadamard transformation result H k, wherein H k is AND-degreeColumn vectors of the same size.
Carrying out the same Hadamard transformation on each column vector in the division mask matrix D demask to obtain a corresponding Hadamard transformation result, and forming a Hadamard transformation result matrix by all Hadamard transformation results: a first intermediate matrix H.
Searching the column of the element with the largest absolute value in the first intermediate matrix HThe first intermediate sequence: all elements in sequence D are column vectorsAll elements of (3).
In the above manner, the receiving end adopts different processing manners for UCI signals with different data amounts, and a sequence D with a fixed sequence length is obtained. The scheme provided by the application not only improves the applicability, but also effectively avoids the influence of the incompletely orthogonal mask matrix on the judgment result in the RM coding process.
S203: a first measure is calculated based on the first selected element of the first intermediate sequence having the largest absolute value and all elements of the first intermediate sequence.
In one possible implementation, the first measure may be calculated by:
Firstly, determining an element |r| max with the largest absolute value in a first intermediate sequence;
next, the sum of absolute values of all elements except |r| max in the first intermediate sequence is calculated Wherein N is the length of the first intermediate sequence and i is an integer.
Finally, a first measure M is calculated, wherein the calculation formula is as follows:
By the mode, the calculation of the first measure value fully utilizes the values of all elements in the second sequence, and adverse effects of over-dispersed values on DTX judgment results when only one to two element values are taken are avoided.
In another possible implementation, the first measure value is not only related to the element values in the first intermediate sequence, but also the received signal strength is taken into account, and the first parameter may then be calculated by the following formula:
Wherein the constant a is used to represent the intensity of the received signal, and the larger the value is, the higher the intensity is.
In the above mode, the receiving end obtains the first measure value through different calculation modes, so that the universality and the accuracy of the method are improved.
S204: and carrying out DTX judgment on the selected signal according to the first measure value and the second threshold value.
Specifically, after the receiving end calculates the first measure value, DTX decision is performed on the received signal according to the magnitude relation between the first measure value and the second threshold.
Optionally, the receiving end performs DTX decision on the selected signal according to the first measure value and the second threshold value of the selected signal. If the first measure value is determined to be greater than the second threshold value, the receiving end determines that the selected signal is in a non-DTX state, that is, the selected signal contains valid information, for example, UCI signals are carried in the PUCCH. If the first measure value is less than or equal to the second threshold, the receiving end determines that the selected signal is in a DTX state, that is, the selected signal does not include valid information, for example, the UCI signal is not carried in the PUCCH.
Taking the example that the receiving end needs to receive the UCI signal in the PUCCH, the receiving end compares the first metric value M with the second threshold after obtaining the first metric value M corresponding to the signal in the PUCCH. If the first measure value is greater than the second threshold value, the receiving end can determine that the DTX decision result is that the terminal device is not in a DTX state, in other words, the signal in the PUCCH carries UCI, in other words, the terminal device has sent NACK/ACK. Correspondingly, the network equipment receives NACK/ACK at the time domain position corresponding to NACK/ACK. If the first measure value is smaller than or equal to the second threshold value, the receiving end can determine that the result of the DTX decision is that the terminal device is in a DTX state, in other words, the signal in the PUCCH does not carry UCI, in other words, the terminal device does not send NACK/ACK. Accordingly, the network device does not receive NACK/ACK at the time domain position corresponding to NACK/ACK.
Alternatively, in an embodiment of the present application, the second threshold may be determined in several ways:
demodulating at least one sample signal only containing noise to obtain a second LLR sequence with the fixed sequence length; respectively carrying out Hadamard transform on each second LLR sequence to obtain a second intermediate sequence with a fixed sequence length; calculating a second measure value according to the element with the largest absolute value in each second intermediate sequence and all elements in the corresponding second intermediate sequence; the second threshold value is determined from the respective second measure value.
Specifically, the receiving end performs the above processing on the plurality of sample signals to obtain a plurality of second measurement values, calculates an average value of the second measurement values, and marks the average value asAt this time, the threshold value may be set twiceThus, when making DTX decisions, if the first measureThe receiving end can determine that the signal is in a non-DTX state, namely the signal contains effective information, otherwise, the signal is in a DTX state.
Or the receiving end can also calculate the overall distribution of the second measure values after obtaining a plurality of second measure values, and take the second measure values with the distribution probability of 10 percentAs a threshold. Thus, in DTX decision, if the first measure valueThe receiving end can determine that the signal is in a non-DTX state, namely the signal contains effective information, otherwise, the signal is in a DTX state.
For another example, the receiving end acquires a plurality of second measure values corresponding to signals in a plurality of sample PUCCHs without UCI, and on the premise of meeting the requirement of the 5G protocol TS38.104 on the PUCCHs, takes a value of the second measure values, which can limit the probability (Discontinuous Transmission to Acknowledge Character Probability, DTX to ACK Prob) of discontinuous transmission signal acknowledgement characters to be less than 1%, as a second threshold. The DTX to ACK Prob refers to: probability that a signal that should be determined to be in a DTX state is erroneously determined to be a signal in a non-DTX state and thus decoded. The calculation method comprises the following steps: when a signal that should be determined to be in a DTX state is transmitted, the ratio of the number of bits 1 to the total number of bits in a code stream decoded by a signal that is erroneously determined to be in a non-DTX state, which is received by a receiving terminal, is counted.
Demodulating the sample signal containing the effective information by the receiving end to obtain a third LLR sequence, carrying out Hadamard transform on the third LLR sequence to obtain a third intermediate sequence, and calculating a third measure value of the sample signal according to the element value in the third intermediate sequence; a second threshold value is determined from the third measure.
In the scheme, the receiving end carries out DTX judgment on the received signal by acquiring the result of Hadamard transformation in the decoding process of the selected signal, so that the influence of the problems of signal to noise ratio, time offset and the like is avoided, and only partial decoding results in the decoding process are used for carrying out DTX judgment, thereby reducing the requirement of the DTX judgment on the performance of the receiving end and improving the accuracy of the DTX judgment. Meanwhile, all elements in the Hadamard transform result are adopted to calculate the first measure value, so that the influence of excessive dispersion of the values on the accuracy of DTX judgment is avoided. In addition, the scheme can be applied to DTX decision of all signals subjected to RM coding, and has higher universality.
It should be understood that the DTX decision method provided by the present application is not only suitable for DTX decision on PUCCH in the scenario shown in fig. 1, but also suitable for DTX decision on other channels.
For example, when the network device sends a physical downlink control channel (Physical Downlink Control Channel, PDCCH) to the terminal device, the terminal device may also determine the PDCCH in the above-mentioned method to determine whether downlink control information (Downlink Control Information, DCI) is carried in the PDCCH. Also for example, a decision is made whether a physical side link shared channel (PSSCH) carries side link feedback control information (SFCI).
The method provided by the embodiment of the application is introduced above, and the device provided by the embodiment of the application is introduced below.
Referring to fig. 3, an embodiment of the present application provides an apparatus 300 for DTX determination, which may be the receiving end above or a chip or an integrated circuit in the receiving end, and the apparatus includes a module/unit/technical means for performing the method performed by the receiving end in the above method embodiment.
Illustratively, the apparatus includes:
An obtaining unit 301, configured to demodulate the received RM-encoded selected signal to obtain a first log likelihood ratio LLR sequence with a fixed sequence length;
A calculating unit 302, configured to perform hadamard transformation on the first LLR sequence according to a first threshold value corresponding to the RM code according to a agreed data amount of the selected signal before the RM code, so as to obtain a first intermediate sequence with the fixed sequence length;
a processing unit 303, configured to calculate a first measure value according to a first selected element with the largest absolute value in the first intermediate sequence and all elements in the first intermediate sequence;
a decision unit 304, configured to perform discontinuous transmission DTX decision on the selected signal according to the first measure value and the second threshold value.
It should be understood that all relevant contents of each step involved in the above method embodiments may be cited to the functional descriptions of the corresponding functional modules, and are not described herein.
As one possible product form of the above device, referring to fig. 4, an embodiment of the present application further provides a communication device 400, including:
at least one processor 401; and a communication interface 403 communicatively coupled to the at least one processor 401; the at least one processor 401, by executing instructions stored in the memory 402, causes the electronic device 400 to perform the method steps performed by any of the above-described method embodiments via the communication interface 403.
Optionally, the memory 402 is located outside the electronic device 400.
Optionally, the electronic device 400 includes the memory 402, where the memory 402 is connected to the at least one processor 401, and the memory 402 stores instructions executable by the at least one processor 401. Fig. 4 shows, with a dashed line, that the memory 402 is optional for the electronic device 400.
The processor 401 and the memory 402 may be coupled through an interface circuit, or may be integrated together, which is not limited herein.
The specific connection medium between the processor 401, the memory 402, and the communication interface 403 is not limited in the embodiment of the present application. In the embodiment of the present application, the processor 401, the memory 402 and the communication interface 403 are connected by a bus 404 in fig. 4, where the bus is indicated by a thick line in fig. 4, and the connection manner between other components is only schematically illustrated, but not limited thereto. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 4, but not only one bus or one type of bus.
It should be understood that the processors mentioned in the embodiments of the present application may be implemented by hardware or may be implemented by software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general purpose processor, implemented by reading software code stored in a memory.
By way of example, the Processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf programmable gate array (Field Programmable GATE ARRAY, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It should be understood that the memory referred to in embodiments of the present application may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (STATIC RAM, SRAM), dynamic random access memory (DYNAMIC RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate Synchronous dynamic random access memory (Double DATA EATE SDRAM, DDR SDRAM), enhanced Synchronous dynamic random access memory (ENHANCED SDRAM, ESDRAM), synchronous link dynamic random access memory (SYNCHLINK DRAM, SLDRAM), and Direct memory bus RAM (DR RAM).
It should be noted that when the processor is a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, the memory (storage module) may be integrated into the processor.
It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
Embodiments of the present application also provide a computer-readable storage medium for storing instructions that, when executed, cause a computer to perform the method steps performed by any of the apparatus in the method examples described above.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (12)

1. A method for DTX decision applied to a signal receiving end, comprising:
Demodulating the received selected signal subjected to the Reed-Muller RM coding to obtain a first Log Likelihood Ratio (LLR) sequence with a fixed sequence length;
According to the appointed data quantity of the selected signal before the RM coding and a first threshold corresponding to the RM coding, hadamard transformation is carried out on the first LLR sequence, and a first intermediate sequence with the fixed sequence length is obtained;
calculating the sum of absolute values of all elements in the first intermediate sequence, and calculating the difference between the sum of absolute values and a first selected element with the largest absolute value in the first intermediate sequence;
comparing the absolute value of the first selected element with the difference value to obtain a first measure value;
When the first measure value is smaller than or equal to a second threshold value, judging that the selected signal is in a DTX state; when the first measure value is greater than the second threshold value, determining that the selected signal is in a non-DTX state; wherein the second threshold is: and determining based on the distribution of the measured values corresponding to the sample signals determined by at least one DTX state.
2. The method of claim 1, wherein the Hadamard transform is performed on the first LLR sequence to obtain a first midamble having the fixed sequence length according to a first threshold for the agreed data amount of the selected signal before the RM code corresponds to the RM code, specifically comprising:
Determining whether the agreed data volume of the selected signal before being subjected to the RM coding is larger than a first threshold corresponding to the RM coding;
If the agreed data quantity is less than or equal to the first threshold value, hadamard transformation is carried out on the first LLR sequence to obtain the first intermediate sequence;
and if the agreed data quantity is determined to be larger than the first threshold value, performing mask removal calculation according to the agreed data quantity and the first LLR sequence to obtain a mask removal matrix, performing Hadamard transform on the mask removal matrix to obtain a first intermediate matrix, and obtaining all elements in a column where a second selected element with the largest absolute value in the first intermediate matrix is located to form the first intermediate sequence.
3. The method of claim 2, wherein performing a demask calculation based on the contracted data amount and the first sequence of LLRs results in the demask matrix, comprising:
calculating a mask matrix used by RM coding according to the agreed data quantity and the first threshold value;
calculating a second intermediate matrix after the mask matrix is coded according to the mask matrix and a preset coding matrix;
the divide mask matrix is calculated from the second intermediate matrix and the first sequence of LLRs.
4. The method of claim 3, wherein calculating the second intermediate matrix after the mask matrix encoding based on the mask matrix and a preset encoding matrix, specifically comprises:
acquiring the preset coding matrix, and multiplying the coding matrix by the mask matrix to obtain a third intermediate matrix;
And taking remainder of all elements in the third intermediate matrix for 2, and subtracting each remainder of 2 times by 1 to obtain all element values of the second intermediate matrix.
5. The method of any one of claims 1-4, wherein the method further comprises:
Demodulating at least one sample signal containing only noise to obtain a second LLR sequence with the fixed sequence length;
Respectively carrying out Hadamard transform on each second LLR sequence to obtain a second intermediate sequence with the fixed sequence length;
Calculating a second measure value according to the element with the largest absolute value in each second intermediate sequence and all elements in the corresponding second intermediate sequence;
the second threshold value is determined from the respective second measure value.
6. A device for DTX decision, applied to a signal receiving end, comprising:
The acquisition unit is used for demodulating the received selected signal after RM coding to obtain a first LLR sequence with a fixed sequence length;
The computing unit is used for carrying out Hadamard transform on the first LLR sequence according to a first threshold value corresponding to the RM code and the agreed data quantity of the selected signal before the RM code so as to obtain a first intermediate sequence with the fixed sequence length;
a processing unit, configured to calculate a sum of absolute values of all elements in the first intermediate sequence, and calculate a difference between the sum of absolute values and a first selected element having a largest absolute value in the first intermediate sequence; comparing the absolute value of the first selected element with the difference value to obtain a first measure value;
A decision unit configured to decide that the selected signal is in a DTX state when the first measure is less than or equal to a second threshold; when the first measure value is greater than the second threshold value, determining that the selected signal is in a non-DTX state; wherein the second threshold is: and determining based on the distribution of the measured values corresponding to the sample signals determined by at least one DTX state.
7. The apparatus of claim 6, wherein the computing unit performs hadamard transform on the first sequence of LLRs according to a first threshold value for the agreed amount of data of the selected signal before the RM encoding and the RM encoding to obtain a first intermediate sequence having the fixed sequence length, and is specifically configured to:
Determining whether the agreed data volume of the selected signal before being subjected to the RM coding is larger than a first threshold corresponding to the RM coding;
If the agreed data quantity is less than or equal to the first threshold value, hadamard transformation is carried out on the first LLR sequence to obtain the first intermediate sequence;
and if the agreed data quantity is determined to be larger than the first threshold value, performing mask removal calculation according to the agreed data quantity and the first LLR sequence to obtain a mask removal matrix, performing Hadamard transform on the mask removal matrix to obtain a first intermediate matrix, and obtaining all elements in a column where a second selected element with the largest absolute value in the first intermediate matrix is located to form the first intermediate sequence.
8. The apparatus of claim 7, wherein the computing unit is configured to, when performing a demask calculation based on the contracted data amount and the first sequence of LLRs to obtain the demask matrix:
calculating a mask matrix used by RM coding according to the agreed data quantity and the first threshold value;
calculating a second intermediate matrix after the mask matrix is coded according to the mask matrix and a preset coding matrix;
the divide mask matrix is calculated from the second intermediate matrix and the first sequence of LLRs.
9. The apparatus of claim 8, wherein the calculating unit is configured to, when calculating the second intermediate matrix after the mask matrix is encoded according to the mask matrix and a preset encoding matrix:
acquiring the preset coding matrix, and multiplying the coding matrix by the mask matrix to obtain a third intermediate matrix;
And taking remainder of all elements in the third intermediate matrix for 2, and subtracting each remainder of 2 times by 1 to obtain all element values of the second intermediate matrix.
10. The apparatus of any one of claim 7 to 9,
The obtaining unit is further configured to demodulate at least one sample signal only containing noise to obtain a second LLR sequence with the fixed sequence length;
The computing unit is further used for respectively carrying out Hadamard transform on each second LLR sequence to obtain a second intermediate sequence with the fixed sequence length;
The processing unit is further used for calculating a second measure value according to the element with the largest absolute value in each second intermediate sequence and all elements in the corresponding second intermediate sequence;
the decision unit is further adapted to determine the second threshold value based on the respective second measure value.
11. A communication device, comprising:
at least one processor; and a memory communicatively coupled to the at least one processor, a communication interface;
Wherein the memory stores instructions executable by the at least one processor, which, by executing the instructions stored by the memory, cause the apparatus to perform the method of any of claims 1-5 via the communication interface.
12. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1-5.
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