CN112533294A - Control channel detection method, device, communication equipment and storage medium - Google Patents

Control channel detection method, device, communication equipment and storage medium Download PDF

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CN112533294A
CN112533294A CN202011323332.5A CN202011323332A CN112533294A CN 112533294 A CN112533294 A CN 112533294A CN 202011323332 A CN202011323332 A CN 202011323332A CN 112533294 A CN112533294 A CN 112533294A
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CN112533294B (en
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刘君
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Abstract

The embodiment of the application discloses a detection method, a device, communication equipment and a storage medium of a control channel, wherein the method comprises the following steps: performing iterative decoding on the control channel to obtain a current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence; determining a current check result and a current check value based on a current decoding result; the current check value is used for representing the credibility of the current check result; decoding processing is carried out based on the current checking result, the current checking value and the termination detection condition; the termination detection condition is used to characterize a condition for terminating iterative decoding.

Description

Control channel detection method, device, communication equipment and storage medium
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting a control channel, a communication device, and a storage medium.
Background
In a Long-Term Evolution (LTE) system of Fourth Generation (4G) mobile communication, a Physical Downlink Control Channel (PDCCH) usually adopts a Forward Error Correction (FEC) Channel coding technique of a Tail Biting Convolutional Code (TBCC) and a common Error detection coding technique of a Cyclic Redundancy Check (CRC); therefore, the terminal needs to decode in a mode of surrounding iterative decoding, check based on the CRC obtained by current iterative decoding, and terminate iteration when the check is passed, so as to determine that Downlink Control Information (DCI) obtained by current iterative decoding is a correct decoding result; however, in case the CRC check passes, the corresponding DCI may be erroneous, resulting in a false detection of the PDCCH.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting a control channel, communication equipment and a storage medium, and improves the detection accuracy of the control channel.
The technical scheme of the application is realized as follows:
the embodiment of the application provides a method for detecting a control channel, which comprises the following steps:
performing iterative decoding on the control channel to obtain a current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence; determining a current check result and a current check value based on the current decoding result; the current check value is used for representing the credibility of the current check result; decoding processing is carried out based on the current checking result, the current checking value and a termination detection condition; the termination detection condition is used to characterize a condition for terminating the iterative coding.
The embodiment of the application provides a detection device for a control channel, and the device comprises:
the decoding module is used for carrying out iterative decoding on the control channel to obtain a current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence;
a determining module, configured to determine a current check result and a current check value based on the current decoding result; the current check value is used for representing the credibility of the current check result;
the processing module is used for carrying out decoding processing based on the current checking result, the current checking value and a termination detection condition; the termination detection condition is used to characterize a condition for terminating the iterative coding.
The embodiment of the application provides a detection device for a control channel, which comprises:
a processor and a memory for storing a computer program capable of running on the processor; wherein the processor is configured to execute the steps of the method for detecting a control channel when running the computer program.
The present embodiments provide a storage medium storing one or more computer programs, which are executable by one or more processors to implement the steps of the above-mentioned control channel detection method.
The detection method, the device, the equipment and the storage medium for the control channel provided by the embodiment of the application carry out iterative decoding on the control channel to obtain the current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence; determining a current check result and a current check value based on a current decoding result; the current check value is used for representing the credibility of the current check result; decoding processing is carried out based on the current checking result, the current checking value and the termination detection condition; the termination detection condition is used for representing the condition of terminating the iterative decoding; that is to say, the communication device determines the current check result, and also needs to evaluate the reliability of the current check result, and according to the current check result, the reliability thereof, and the termination detection condition, it can determine whether the decoding is successful at the current time, so as to determine whether to continue the next decoding, thereby improving the detection accuracy of the control channel.
Drawings
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an encoder according to an embodiment of the present disclosure;
fig. 3 is a first flowchart illustrating a method for detecting a control channel according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating a second method for detecting a control channel according to an embodiment of the present disclosure;
fig. 5 is a third schematic flowchart of a method for detecting a control channel according to an embodiment of the present application;
fig. 6 is a first schematic diagram of a state transition provided in an embodiment of the present application;
fig. 7 is a fourth schematic flowchart of a method for detecting a control channel according to an embodiment of the present disclosure;
fig. 8 is a schematic structural composition diagram of a detection apparatus for a control channel according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
An embodiment of the present application provides a schematic structural diagram of a communication system, as shown in fig. 1, the communication system may include: a terminal 101 and a network device 102.
The terminal 101 may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication capability, as well as various forms of user equipment, Mobile Stations (MSs), terminals (terminal devices), and so forth. For convenience of description, the above-mentioned devices are collectively referred to as a terminal. The network device 102 and the terminal 101 communicate with each other through some air interface technology, for example, a Uu interface.
The network device 102 may be an evolved NodeB (eNB), an Access Point (AP), or a relay station in a Long Term Evolution (LTE) system, or may be a base station (e.g., a gNB or a Transmission Point (TRP)) in a 5G system, and in a 5G NR-U system, a device having a base station function is referred to as a gnnodeb or a gNB. The description of "base station" may change as communication technology evolves. The Network device 102 may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, a Mobile switching center, a relay Station, an Access Point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, or a Network device in a future communication System, and may also be a Base Station in an NTN System (such as a gNB or a Transmission Point (TRP), a Global System for Mobile communication (GSM) System, or a Base Station in a Code Division Multiple Access (CDMA) System (Base Transceiver Station, BTS), or a Base Station in a Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) System (NodeB, NB), and the like, which is not limited in this application.
In addition, in this embodiment of the present application, the network device 102 provides a service for a cell, and the terminal 101 communicates with the network device 102 through a transmission resource (for example, a frequency domain resource or a spectrum resource) used by the cell, where the cell may be a cell corresponding to the network device 102 (for example, a base station), and the cell may belong to a macro base station or a base station corresponding to a small cell (small cell), where the small cell may include: urban cell (etro cell), Micro cell (Micro cell), Pico cell (Pico cell), Femto cell (Femto cell), these small cells have the characteristics that coverage is little, transmission power is low, are applicable to and provide high-speed data transmission service. In addition, the cell may also be a super cell (supercell).
Currently, in a 4G mobile communication LTE system, when a network device sends DCI to a terminal, it is necessary to perform check bit scrambling on the DCI, input a scrambled bit stream and a DCI bit stream into an encoder for encoding, and send a result of encoding output to the terminal through a PDCCH.
In the embodiment of the present application, the DCI information is generally represented as a K-bit binary DCI bitstream: c. C0,c1,…,cK-1Generating a corresponding check bit stream for the DCI information by formula (1): p is a radical of0,p1,…,p15：
r(D)＝mod2(m(D)×D16,gcrc16(D)) (1)
Wherein, r (d) is a polynomial corresponding to the check bit stream, as shown in formula (2); d is a polynomial term; gcrc16(D) Is a preset polynomial with 16 as the highest-order term, and is shown as a formula (3); m (D) is a polynomial corresponding to the DCI bit stream, and is shown as a formula (4); mod2Representing binary field division with remainder.
r(D)＝p0×D15+p1×D14+…+p15 (2)
gcrc16(D)＝D16+D12+D5+D1 (3)
m(D)＝c0×DK-1+c1×DK-2+…+cK-1 (4)
In this embodiment of the present application, after obtaining the check bit stream, scrambling each bit in the check bit stream through a Radio Network Temporary Identifier (RNTI) and an antenna selection mask to obtain a scrambled check bit stream: p'0,p′1,…,p′15。
It should be noted that the radio network temporary identifier and the antenna selection mask are both binary bit streams, the number of bits is the same as the number of bits of the check bit stream, and the ith check bit p 'in the check bit stream'iScrambling may be performed as shown in equation (5):
p′i＝(pi+xRNTI,i+xAS,i)mod2 (5)
wherein x isRNTI,iDenotes the ith bit, x, in the binary bit stream corresponding to the RNTIAS,iIndicating the ith bit in the binary bit stream corresponding to the antenna selection mask; mod2 represents a binary computation, where "+" represents an exclusive-or algorithm in the binary computation.
It should be noted that, if the network device is configured with multiple antennas, the network device uses the antenna selection mask corresponding to the antenna through which the control channel is transmitted, and each antenna is provided with a corresponding antenna selection mask.
In the embodiment of the present application, the scrambled check bit stream is placed in order after the DCI bit stream to obtain a k' bit encoded bit stream: c'0,c′1,…,c′k′-1As shown in equation (6):
c′0,c′1,…,c′k′-1＝c0,c1,…,ck-1,p0,p1,…,p15 (6)
where k' ═ k + 16.
In the embodiment of the present application, after obtaining the coded bit stream, the network device may input the coded bit stream into an encoder for encoding, and then send an output result of the encoder to the terminal through the PDCCH.
In this embodiment, the encoder may be a shift register composed of a plurality of delays, where the number of delays may be set as required, and this is not limited in this embodiment.
For example, as shown in fig. 2, the encoder may be a TBCC encoder composed of 6 delays, and the network device needs to input the encoded bit stream into the encoder from left to right in sequence until the last bit is input, and the encoding is finished.
The initial state of the TBCC encoder is the last 6 bits of the encoded bit stream, so that after the encoder finishes encoding, the initial state and the end state of the encoder can be guaranteed to be consistent, and tail biting can be formed.
In the embodiment of the present application, for any one time, the current state of the encoder is denoted as E5,E4,E3,E2,E1,E0Wherein each E is a binary number 0 or 1; each E represents the current output of a delay; if the bit input by the encoder is recorded as c 'at the current moment'mThen at the next time instant, the rightmost bit of the encoder is shifted out, c'mMoving in from left, the current state of the encoder transitions to: c'm,E5,E4,E3,E2,E1(ii) a Encoder output
Figure BDA0002793583060000051
i is 0,1,2, as shown in formulas (7) to (9):
Figure BDA0002793583060000052
Figure BDA0002793583060000053
Figure BDA0002793583060000054
in the embodiment of the application, the output at any time
Figure BDA0002793583060000055
Input c 'corresponding to the time'mAnd a transition process of the encoder from the current state to the next state;
Figure BDA0002793583060000056
is a binary bit and takes the value of 0 or 1.
In the embodiment of the application, after receiving the PDCCH, the terminal needs to demodulate and perform cyclic iterative decoding on the PDCCH, each iterative decoding can obtain a corresponding decoding sequence, a current CRC bit stream and a current DCI bit stream are determined from the decoding sequences, checking is performed based on the current CRC, and if the checking passes, the DCI obtained by the current decoding is determined to be correct DCI; however, when the CRC check passes, the corresponding DCI may not be the correct DCI, that is, there is a certain false detection rate in the method of detecting the PDCCH only through the CRC check result; for example, for a 16-bit CRC, there is an unacceptable probability of false detection; the false detection of the PDCCH will have a serious impact on system scheduling.
An embodiment of the present application provides a method for detecting a control channel, as shown in fig. 3, the method includes: S101-S103.
S101, performing iterative decoding on a control channel to obtain a current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence;
in the embodiment of the application, after receiving the control channel, the communication device performs iterative decoding on the control channel, so as to obtain a current decoding result, wherein the current decoding result is a decoding sequence; the decoding sequence comprises a current time information bit sequence and a current time check bit sequence.
Here, the communication device may be a terminal in the communication system, or may be any communication device that needs to receive and decode the control channel, such as a network device in the communication system, and the embodiment of the present application is not limited thereto.
In this embodiment of the present application, the method for iteratively decoding the control channel may be a Maximum Likelihood algorithm (ML) or a Maximum a posteriori Probability (MAP) algorithm, which is not limited in this embodiment of the present application.
In the embodiment of the present application, after obtaining the decoding result, the communication device may extract the current-time information bit sequence and the current-time check bit sequence from the decoded sequence according to a preset encoding manner.
For example, if the preset coding mode is to put the check bit sequence after the information bit sequence to form a coded bit sequence, the communication device may determine the information bit sequence and the check bit sequence according to the number of bits of the check bit sequence; for example, if the number of the parity bit sequence bits is 16, the last 16 bits in the decoded sequence are determined as the parity bit sequence, and the previous sequence of the parity bit sequence is determined as the information bit sequence.
S102, determining a current check result and a current check value based on a current decoding result; the current check value is used for representing the credibility of the current check result;
in the embodiment of the application, after the communication device obtains the current decoding result, the communication device can determine the current checking result and the current check value according to the current decoding result; and the current check value is used for representing the credibility of the current check result.
In some embodiments of the present application, the current-time check value may be used to characterize stability of decoding results obtained by successive iterative decoding; if the decoding results obtained by continuous iterative decoding for multiple times are the same, the stability of the decoding results is high; meanwhile, the credibility of the current verification result is higher; if the current decoding result is different from the last decoding result, the stability of the decoding result is poor, and the reliability of the current verification result is low.
For example, after obtaining the current decoding result, the communication device may compare the current information bit sequence with the last information bit sequence to determine the stability of the information bit sequence; or, the communication device may also compare the current check bit sequence with the last check bit sequence to determine the stability of the check bit sequence; the embodiments of the present application are not limited thereto.
In some embodiments of the present application, the current-time check value may be used to characterize the stability of the reliability of the current consecutive multiple encodings; the communication equipment performs reliability evaluation on the current decoding result to obtain the stability of the current decoding result, so that the reliability of the multi-time decoding result is obtained, and the current test value is determined according to the multi-time decoding result.
In the embodiment of the application, if the reliability of the current iteration decoding is high and the reliability of the continuous iteration decoding for multiple times is high, the reliability of the current continuous verification result for multiple times is high; if the reliability of the current decoding is low; and the reliability of the last decoding is high, which shows that the reliability of the current continuous multi-decoding is low, and the reliability of the current verification result is low.
S103, decoding processing is carried out based on the current checking result, the current checking value and the termination detection condition; the termination detection condition is used to characterize a condition for terminating iterative decoding.
In the embodiment of the application, after obtaining the current verification result and the current verification value, the communication device may perform decoding processing according to the current verification result, the current verification value and the termination detection condition; wherein the termination detection condition is used for representing the condition for terminating the iterative decoding.
In this embodiment, the communication device may determine a next decoding processing mode according to whether the current verification result and the current check value satisfy the termination detection condition.
In the embodiment of the present application, the next decoding processing manner includes: and continuing to perform next decoding or terminating iterative decoding.
In the embodiment of the present application, the case of terminating the iterative decoding may be that the decoding fails, or the decoding succeeds, and the iterative decoding does not need to be continued.
It should be noted that, in the case of successful decoding, the communication device determines the current information bit sequence as the detected correct information bit sequence.
The detection method, the device, the equipment and the storage medium for the control channel provided by the embodiment of the application carry out iterative decoding on the control channel to obtain the current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence; determining a current check result and a current check value based on a current decoding result; the current check value is used for representing the credibility of the current check result; decoding processing is carried out based on the current checking result, the current checking value and the termination detection condition; the termination detection condition is used for representing the condition of terminating the iterative decoding; that is to say, the communication device needs to determine whether the decoding is successful at the current time according to the current time check result, the current time check value and the termination detection condition, so as to determine whether to continue to perform the next decoding subsequently, thereby improving the detection accuracy of the control channel.
In some embodiments of the present application, the communication device may determine to terminate the iterative decoding when the current-time check result and the current-time check value satisfy the termination detection condition; or, under the condition that the current time check result and the current time check value do not meet the condition of terminating iteration, determining to continue decoding for the next time.
In the embodiment of the application, the termination detection condition is a preset condition; after obtaining the current verification result and the current verification value, the communication device needs to first judge whether the current verification result and the current verification value meet the condition of terminating iteration to obtain a judgment result; if the judgment result is that the current check result and the current check value meet the iteration termination condition, terminating the iterative decoding; otherwise, continuing to decode next time.
In some embodiments of the present application, the determining, in S102, implementations of the current-time check result and the current-time check value based on the current-time decoding result, as shown in fig. 4, may include: S201-S203.
S201, calculating based on the current information bit sequence to obtain a current calculation check bit sequence;
in the embodiment of the present application, after obtaining the current-time information bit sequence, the communication device obtains a polynomial corresponding to the current-time information bit sequence, and substitutes the polynomial as m (d) into equation (1) to obtain a corresponding current-time calculation check bit sequence.
S202, determining a current check result based on a current decoding result and a current calculation check bit sequence;
in this embodiment, after obtaining the check bit sequence calculated at the current time, the communication device may determine the check result at the current time based on the decoding result and the check bit sequence calculated at the current time.
In some embodiments of the present application, the communication device may compare the current-time calculated check bit sequence with the current-time check bit sequence, and determine that the current-time check result is a check pass if the current-time calculated check bit sequence is the same as the current-time check bit sequence; otherwise, determining that the current checking result is that the checking is not passed.
In the embodiment of the application, the check bit sequence calculated at the current time is calculated according to the information bit sequence at the current time, and the information bit sequence at the current time and the check bit sequence at the current time are both obtained by decoding at the current time; therefore, in the case that the current time calculation check bit sequence is the same as the current time check bit sequence, the check can be determined to pass, otherwise, the check is determined not to pass.
In some embodiments of the present application, the determining, in S202, implementation of the current parity check result based on the decoding result and the current parity check bit sequence may include: S2021-S2023.
S2021, combining the current time information bit sequence and the current time calculation check bit sequence into a current time check information sequence; the current time of calculating the check bit sequence is behind the current time of information bit sequence;
in the embodiment of the application, the communication device puts the current calculated check bit sequence behind the current information bit sequence to obtain the check information sequence.
Here, if the current information bit sequence is the correct information bit sequence, the current check bit sequence is calculated to be the correct check bit sequence, and the check information sequence is the encoded bit sequence input by the encoder.
S2022, dividing the current time check information sequence by the current time check bit sequence to obtain a remainder;
s2023, if the remainder is 0, determining that the current verification result is verification pass; otherwise, determining that the current checking result is that the checking is not passed.
In the embodiment of the application, the communication equipment divides the check information sequence by the current check bit sequence to obtain a remainder; if the remainder is 0, it indicates that the check information sequence is a coded bit sequence, that is, the decoding result obtained by the current decoding is correct, that is, the current information bit sequence is a correct information bit sequence, and the current check bit sequence is a correct check bit sequence.
It can be understood that, since the calculated check bit sequence is calculated from the corresponding information bit sequence, the correctness of the current-time information bit sequence and the current-time check bit sequence can be determined simultaneously by checking the current-time calculated check bit sequence and the current-time check bit sequence. If the current check result is that the check is passed, the current information bit sequence and the current check bit sequence are correct; and if the current check result is that the check is not passed, indicating that the current information bit sequence and the current check bit sequence are incorrect.
And S203, calculating a check bit sequence based on the current time, and determining the current time check value.
In the embodiment of the present application, after obtaining the check bit sequence calculated at the current time, the communication device may determine the check value at the current time according to the check bit sequence calculated at the current time.
In some embodiments of the present application, the determining, in S203, an implementation of the current check value based on the current check bit sequence, as shown in fig. 5, may include: S301-S303.
S301, acquiring a check bit sequence calculated last time;
s302, comparing the current calculation check bit sequence with the last calculation check bit sequence to obtain a comparison result;
in the embodiment of the application, after each iterative decoding, the communication device can obtain an information bit sequence of each decoding, and further obtain a calculation check bit sequence of each decoding; therefore, after the communication device obtains the check bit sequence calculated at the current time, the communication device can obtain the check bit sequence calculated at the last time, and compare the check bit sequence calculated at the current time with the check bit sequence calculated at the last time to obtain a comparison result.
In the embodiment of the application, the comparison result is that the check bit sequence calculated at the current time is the same as the check bit sequence calculated at the last time; alternatively, the check bit sequence calculated at the current time is different from the check bit sequence calculated at the last time.
And S303, determining the current test value based on the comparison result.
After the communication device obtains the comparison result in the embodiment of the present application, the current verification value may be determined according to the comparison result.
In some embodiments of the present application, in a case that a comparison result is that a check bit sequence calculated at the current time is the same as a check bit sequence calculated at the last time, the communication device may increase a check value decoded at the last iteration by a first preset value to obtain a check value at the current time; alternatively, the communication device may determine that the current check value is the second preset value when the comparison result is that the current calculated check bit sequence and the last calculated check bit sequence are different.
In the embodiment of the application, if the comparison results of the successive iterative decoding are that the check bit sequence calculated at the current time is the same as the check bit sequence calculated at the last time, the check value is continuously increased based on the first preset value; and if the comparison result of the continuous iterative decoding for multiple times is that the check bit sequence calculated at the current time is different from the check bit sequence calculated at the last time, keeping the check value at a second preset value. The second preset value may be an initial check value, that is, a last check value corresponding to the first decoding in the iterative decoding process.
In some embodiments of the present application, the communication device may set a counter by which to obtain the current verification value.
For example, the first preset value may be 1, and the second preset value may be 0; the communication device may increase the calculator by 1 when the current calculated check bit sequence is the same as the last calculated check bit sequence; in the case where the current-time calculated check bit sequence and the last-time calculated check bit sequence are identical, the counter is set to 0. In this way, the communication device can obtain the value of the counter and determine the value of the counter as the check value.
In some embodiments of the present application, the termination detection condition includes at least one of: 1. the current checking result is that the checking is passed, and the current checking value is greater than a first checking threshold value; 2. the current checking result is that the checking is not passed, and the current checking value is greater than a second checking threshold value; the second verification value is greater than the first verification threshold; 3. the current iteration number of the iterative decoding is larger than the maximum iteration number.
In the embodiment of the application, a first verification threshold and a second verification threshold are preset, wherein the first verification threshold is larger than the second verification threshold.
In some embodiments of the present application, after obtaining the current check value, the current check result, and the current iteration count, the communication device determines whether the current iteration count is the maximum iteration count, and if so, terminates the iterative decoding; otherwise, judging whether the current checking result passes or fails the checking, if the current checking result passes the checking, judging whether the current checking value is larger than a first checking threshold value, if so, determining that the decoding is successful, terminating the iterative decoding, and determining the current information bit sequence as a correct information bit sequence; otherwise, continuing decoding for the next time; if the current check result is that the check is not passed, judging whether the current check value is larger than a second check threshold value, if so, terminating iterative decoding, otherwise, continuing the next decoding.
In some embodiments of the present application, after obtaining the current check value, the current check result, and the current iteration number, the communication device may first determine whether the current check result passes or fails; if the current checking result is that the checking is passed, judging whether the current checking value is greater than a first checking threshold value; if the current time check value is larger than the first check threshold value, determining that the decoding is successful and terminating the iterative decoding, and determining the current time information bit sequence as a correct information bit sequence; if the current check value is smaller than or equal to the first check threshold, judging whether the current iteration number is larger than the maximum iteration number and whether the current check value is larger than a second check threshold; if one of the two judgment results is yes, terminating the iteration; if the two judgment results are negative, continuing to decode the next time.
It should be noted that, the first verification threshold and the second verification threshold may be set according to actual needs; the method can also be determined according to experimental data, and the embodiment of the application is not limited in this respect.
It can be understood that, when the current check result is that the check is passed, the communication device needs to combine the relationship between the current check value and the first check threshold value to determine whether the current decoding is successful, so as to avoid the false detection of the control channel caused by the DCI information error due to the pass of the check, and improve the detection accuracy of the control channel. And under the condition that the current iteration number does not reach the maximum iteration number, the communication equipment can judge that the current decoding fails when the current check fails and the current check value is greater than a second check threshold value, terminate the iterative decoding in advance and improve the detection efficiency of the control channel.
It should be noted that, the number of bits of the information bit stream is set to 40, the number of bits of the check bit stream is 8, the first check threshold is 2, the second check threshold is 3, and the maximum iteration number is 10, and the false detection rate and the average iteration number corresponding to different signal-to-noise ratios are obtained through simulation; compared with the prior art, the detection method of the control channel obviously reduces the false detection rate of the control channel; in addition, by adopting the detection method for the control channel, under the condition of low signal to noise ratio, the average iteration times can be greatly reduced, the decoding complexity is reduced, and the detection efficiency is improved.
In some embodiments of the present application, the iteratively decoding the control channel in S101 to obtain the implementation of the current decoding result includes: S401-S402.
S401, acquiring transmission information of a control channel; the transmission information corresponds to the output data of the encoder;
in the embodiment of the application, after receiving the control channel, the communication device demodulates the control channel to obtain the transmission information of the control channel.
It should be noted that, after the transmitting device of the control channel encodes the information to be transmitted through the encoder to obtain the output data of the encoder, the transmitting device of the control channel modulates the output data of the encoder and transmits the modulated output data due to the existence of noise on the control channel; therefore, after the communication equipment receives the control channel, the communication equipment can directly acquire the output data of the encoder, and after the communication equipment demodulates the control channel, the transmission information corresponding to the output data of the encoder is acquired.
In the embodiment of the application, the control channel can receive corresponding transmission information at each moment; the transmission information of each moment corresponds to the output data of the encoder of one moment; that is, the communication device may acquire at least one transmission information after the reception of the control channel is completed.
S402, carrying out iterative decoding based on the transmission information to obtain a current decoding result.
In the embodiment of the present application, after the communication device obtains the transmission information, iterative decoding may be performed based on the transmission information to obtain a current decoding result.
In some embodiments of the present application, in S402, performing iterative decoding based on the transmission information to obtain a current decoding result, including: S501-S502.
S501, performing iterative decoding based on the transmission information, and determining at least one survival path at the current time; the at least one survivor path is used for characterizing a complete transition process of the encoder from the at least one starting state to the corresponding at least one ending state;
in the embodiment of the present application, the communication device may determine, according to the transmission information, a complete transition process of the encoder from the starting state to the corresponding at least one ending state; since the encoder may have at least one end state, the communication device needs to determine a corresponding complete transition procedure for each end state; each complete transfer process corresponds to a survivor path.
In some embodiments of the present application, the iteratively decoding based on the transmission information in S501 to determine implementation of the current at least one survivor path may include: S601-S602.
S601, determining at least one group of corresponding score value measurement based on the transmission information and at least one end state; each of the at least one set of scoring metrics includes at least one scoring metric; at least one score metric for characterizing at least one state transition in a complete transition;
in an embodiment of the present application, the communication device may determine, for each of the at least one end state, a corresponding set of score metrics, resulting in at least one set of score metrics; wherein each set of score metrics comprises at least one score metric; each score metric of the at least one score metric corresponds to at least one state transition of a complete transition process.
Illustratively, the at least one transmission information obtained by the communication device demodulating the control channel is at least one Log Likelihood Ratio (LLR), where one Log Likelihood Ratio at any time is used as the LLR
Figure BDA0002793583060000111
As shown in equation (10):
Figure BDA0002793583060000112
wherein the content of the first and second substances,
Figure BDA0002793583060000121
to represent
Figure BDA0002793583060000122
The corresponding transmitted symbol is transmitted in the corresponding channel,
Figure BDA0002793583060000123
to represent
Figure BDA0002793583060000124
A corresponding received symbol;
Figure BDA0002793583060000125
that is, if
Figure BDA0002793583060000126
Is 0, is mapped to 1, is transmitted on symbol 1, if it is
Figure BDA0002793583060000127
If 1, it is mapped to 0 and transmitted on symbol 0.
In this applicationIn an embodiment, for an encoder such as that shown in FIG. 2, the state at any one instant m +1 may have a 2664 states for any one state s at time m +1m+1Possibly from two states sm,j＝0,1The transition is shown in fig. 6, where fig. 6 shows a state transition butterfly diagram.
Exemplary, sm+1＝C′mE5E4E3E2E1Then, the two states corresponding to the time m include: sm,0＝E5E4E3E2E10 and sm,1＝E5E4E3E2E11; that is, sm+1Is at sm,j＝0,1Is moved to c'mAnd removed E0Is obtained as 0 or 1.
In the examples of the present application, if c'm0, the encoder will be from sm,0Is transferred to sm+1＝0E5E4E3E2E1Corresponding encoder output
Figure BDA0002793583060000128
Wherein, FiAs shown in formulas (11) to (13):
Figure BDA0002793583060000129
Figure BDA00027935830600001210
Figure BDA00027935830600001211
from this, it can be determined if c'm1, the encoder will be from sm,0Is transferred to sm+1＝1E5E4E3E2E1Corresponding to
Figure BDA00027935830600001212
If c'm0, the encoder will be from sm,1Is transferred to sm+1＝0E5E4E3E2E1Corresponding to
Figure BDA00027935830600001213
If c'm1, the encoder will be from sm,1Is transferred to sm+1＝1E5E4E3E2E1Corresponding to
Figure BDA00027935830600001214
In the embodiment of the application, for any state s at the moment m +1m+1Possibly from the state s at time mm,0The transition is possible from the state s at time mm,1From the moment m to the moment m +1, the encoder is determined from sm,j＝0,1Is transferred to sm+1A score measure BM ofsm+1,j＝0,1As shown in equation (14):
Figure BDA00027935830600001215
in the examples of the present application, the expression sm,j＝0,1Is transferred to sm+1Two score measures can be derived:
Figure BDA00027935830600001216
and
Figure BDA00027935830600001217
determining the maximum score metric of the two score metrics as the score metric corresponding to the current state transition, and recording as
Figure BDA00027935830600001218
Then if
Figure BDA00027935830600001219
Then represents sm+1Is composed ofm,0Transferring to obtain; if it is
Figure BDA00027935830600001220
Then represents sm+1Is composed ofm,1Is transferred to the patient.
In the embodiment of the application, the state of the encoder is changed from the initial state s from the starting time 0 to the ending time k' of the encoder0Transfer to sk′+1For any one end state sk′+1The communication device can obtain k
Figure BDA0002793583060000131
By can be k
Figure BDA0002793583060000132
Composition correspondence set of score metrics
Figure BDA0002793583060000133
In the embodiment of the present application, there are several possible end states of the encoder, and corresponding component value metrics can be obtained.
S602, summing at least one score metric in each group of score metrics with the corresponding current initial path metric to obtain at least one path metric; wherein at least one path metric is used as the initial path metric of the next time; at least one path metric is used to characterize a corresponding at least one survivor path.
In the embodiment of the present application, a group of score metrics corresponds to a current-time initial path metric, and at least one score metric in each group of score metrics is summed with the corresponding current-time initial path metric to obtain a corresponding path metric.
Illustratively, for any one end state sk′+1To obtain corresponding path metrics
Figure BDA0002793583060000134
Can be calculated by equation (15):
Figure BDA0002793583060000135
will sk′+1Corresponding set of score metrics
Figure BDA0002793583060000136
And the initial path metric corresponding to the component value metric is recorded as
Figure BDA0002793583060000137
With substituting equation (15), equation (16) can be obtained:
Figure BDA0002793583060000138
in the present embodiment, there is at least one end state at time k', and thus, a corresponding at least one end state may be obtained
Figure BDA0002793583060000139
Each one of which is
Figure BDA00027935830600001310
Corresponding to a survivor path.
Note that the initial path metric
Figure BDA00027935830600001311
Defaulting to 0 at the first iterative decoding; decoded at the current iteration
Figure BDA00027935830600001312
It is obtained by last iterative decoding
Figure BDA00027935830600001313
S502, determining a current decoding result based on at least one survival path at the current time.
In an embodiment of the present application, the communication device determines at least one path metric, which is equivalent to determining at least one survivor path, and may determine the current decoding result based on the at least one survivor path.
In some embodiments of the present application, the determining, in S502, an implementation of the current decoding result based on the current at least one survivor path may include: S701-S703.
S701, determining the maximum path metric as a final survival path from at least one path metric;
in the embodiment of the application, the communication device determines the maximum path metric from at least one path metric, and takes a survivor path corresponding to the maximum path metric as a final survivor path; wherein the final survivor path is used to characterize the actual complete transition process of the determined encoder.
S702, backtracking based on the final survivor path to obtain a current decoding sequence;
in this embodiment, the communication device may trace back each state transition of the encoder based on the final survivor path, and further determine the bit input by the encoder at each time, so as to obtain the current secondary decoding sequence composed of each input bit.
S703, determining a current information bit sequence and a current check bit sequence from the current decoding sequence; and taking the current information bit sequence and the current check bit sequence as the current decoding result.
In this embodiment, after obtaining the current decoding sequence, the communication device may determine the current information bit sequence and the current check bit sequence in the current decoding sequence according to a generation manner of the coded bit stream.
Illustratively, the coded bit stream is composed of an information bit sequence and a following check bit sequence, the number of bits of the check bit sequence is 16, the communication device may determine the last 16 bits in the current decoding sequence as the current decoding check bit sequence, determine the sequence before the current decoding check bit sequence as the current information bit sequence, and compose the current decoding result from the current information bit sequence and the current decoding check bit sequence.
In some embodiments of the present application, the implementation after determining the current check result based on the decoding result and the current check bit sequence in S202 may further include, as shown in fig. 7: S801-S802.
S801, acquiring a current reliability parameter based on at least one path metric; the current reliability parameter is used for representing the reliability of the current decoding result;
in an embodiment of the application, a communication device may determine a reliability parameter based on at least one path metric; and representing the reliability of the current decoding result through the reliability parameters.
In some embodiments of the present application, a communication device determines a mean and a variance of at least one path metric; the variance is divided by the square of the mean to obtain the reliability parameter.
Illustratively, the at least one path metric obtained by the communication device is N, and any one path metric is represented as
Figure BDA0002793583060000141
Wherein N is 1,2, … N; the mean μ of the N path metrics can be obtained by equation (17):
Figure BDA0002793583060000142
variance σ of N path metrics2This can be obtained by equation (18):
Figure BDA0002793583060000143
then, a current reliability parameter ρ is obtained by equation (19):
Figure BDA0002793583060000144
in an embodiment of the present application, the reliability parameter may characterize a degree of uniformity of the distribution of the at least one path metric; if the distribution of at least one path metric is more uniform, the reliability parameter obtained by calculation is smaller; the computed reliability parameter is larger if a more uneven distribution of the at least one path metric indicates a significant difference between the at least one path metric.
In this embodiment of the present application, the more uniformly the at least one path metric is distributed, the smaller the difference between different path metrics is, and the smaller the reliability of the final survivor path determined based on the at least one path metric is, the smaller the reliability of the current decoding result is; the more unevenly distributed the at least one path metric, i.e. the greater the difference between different path metrics, the greater the reliability of the final survivor path determined based on the at least one path metric, the greater the reliability of the current decoding result.
S802, determining a current check value based on the current reliability parameter.
In the embodiment of the present application, after acquiring the current-time reliability parameter, the communication device may determine the current-time check value according to the current-time reliability parameter.
In some embodiments of the present application, the current-time check value comprises a current-time first check value and a current-time second check value; the communication equipment can increase the first check value of the last iterative decoding by a third preset value under the condition that the current reliability parameter is smaller than the reliability threshold value to obtain the current first check value; determining the current second check value as a fourth preset value; or, when the current reliability parameter is greater than or equal to the reliability threshold, determining the current first check value as a fourth preset value, and adding a third preset value to the last iterative decoding second check value to obtain the current second check value.
In the embodiment of the application, if the reliability parameters obtained by the continuous multiple iterative decoding are smaller than the preset threshold, the current first check value is continuously increased based on the third preset value, and the current second check value is kept as the fourth preset value; if the reliability parameters obtained by continuous repeated iterative decoding are all larger than or equal to the preset threshold value, keeping the current first check value as a third preset value; the current second check value is continuously increased based on the fourth preset value.
In the embodiment of the present application, the first check value and the second check value are used to characterize the stability of the reliability of the multiple consecutive decoding results, i.e. the reliability of the current check result. The first check value is used for representing the stability degree with low reliability, and the second check value is used for representing the stability degree with high reliability.
In some embodiments of the present application, the communication device may set a corresponding first counter for a current first verification value; and setting a corresponding second counter for the current second check value, acquiring the current first check value through the first counter, and acquiring the current second check value through the second counter.
Illustratively, the third preset value may be 1, and the fourth preset value is 0; the communication device may increment the first counter by 1 and set the second counter to 0 if the current-time reliability parameter is less than the reliability threshold; in the case that the current-time reliability parameter is greater than or equal to the reliability threshold, the first counter is set to 0 and the second counter is incremented by 1.
In some embodiments of the present application, the termination detection condition may include at least one of: 1. the current checking result is that the checking is passed, and the current second checking value is greater than a third checking threshold value; 2. the current checking result is that the checking is not passed, and the current first checking value is greater than the fourth checking threshold value; 3. the current iteration number of the iterative decoding is larger than the maximum iteration number.
In some embodiments of the present application, after obtaining the current first check value, the current second check value, the current check result, and the current iteration count, the communication device determines whether the current iteration count is the maximum iteration count, and if so, terminates the iterative decoding; otherwise, judging whether the current checking result passes or fails the checking, if the current checking result passes the checking, judging whether the current second checking value is larger than a third checking threshold value, if so, determining that the decoding is successful, terminating the iterative decoding, and determining the current information bit sequence as a correct information bit sequence; otherwise, continuing decoding for the next time; if the current checking result is that the checking is not passed, judging whether the current first checking value is larger than a fourth checking threshold value, if so, terminating the iterative decoding, otherwise, continuing the next decoding.
In some embodiments of the present application, after obtaining the current first check value, the current second check value, the current check result, and the current iteration number, the communication device may determine whether the current check result passes or fails; if the current checking result is that the checking is passed, judging whether the current second checking value is larger than a third checking threshold value; if so, determining that the decoding is successful, terminating the iterative decoding, and determining the current information bit sequence as a correct information bit sequence; if not, continuously judging whether the current iteration number is larger than the maximum iteration number and whether the current first check value is larger than a fourth check threshold value; if one of the two judgment results is yes, terminating the iteration; if the two judgment results are negative, continuing to decode the next time.
It should be noted that the third verification threshold and the fourth verification threshold may be set according to actual needs; the method can also be determined according to experimental data, and the embodiment of the application is not limited in this respect.
It can be understood that, when the current check result is that the check is passed, the communication device needs to combine the relationship between the current second check value and the third check threshold value to determine whether the current decoding is successful, so as to avoid the false detection of the control channel caused by the DCI information error due to the pass of the check, and improve the detection accuracy of the control channel. And under the condition that the current iteration number does not reach the maximum iteration number, the communication equipment can judge that the current decoding fails when the current check fails and the current first check value is greater than the fourth check threshold value, terminate the iterative decoding in advance and improve the detection efficiency of the control channel.
It should be noted that, the number of bits of the information bit stream is set to 40, the number of bits of the check bit stream is set to 8, the reliability threshold is 0.05, the third check threshold is 3, the fourth check threshold is 1, and the maximum iteration number is 10, so that the false detection rate and the average iteration number corresponding to different signal-to-noise ratios are obtained through simulation; compared with the prior art, the detection method of the control channel obviously reduces the false detection rate of the control channel; in addition, by adopting the detection method for the control channel in the embodiment of the application, under the condition of low signal to noise ratio, the average iteration times can be greatly reduced, the decoding complexity is reduced, and the detection efficiency is improved.
An embodiment of the present application provides a detection apparatus for a control channel, as shown in fig. 8, the detection apparatus 18 for a control channel includes:
the decoding module 181 is configured to perform iterative decoding on the control channel to obtain a current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence;
a determining module 182, configured to determine a current check result and a current check value based on the current decoding result; the current check value is used for representing the credibility of the current check result;
a processing module 183, configured to perform decoding processing based on the current verification result, the current verification value, and a termination detection condition; the termination detection condition is used to characterize a condition for terminating the iterative coding.
In some embodiments, the processing module 183 is further configured to determine to terminate the iterative decoding if the current-time check result and the current-time check value satisfy a termination detection condition; and if the current check result and the current check value do not meet the termination detection condition, determining to continue decoding for the next time.
In some embodiments, the determining module 182 is further configured to perform a calculation based on the current-time information bit sequence to obtain a current-time calculated check bit sequence; determining the current check result based on the decoding result and the current calculation check bit sequence; determining the current-time check value based on the current-time calculation check bit sequence.
In some embodiments, the determining module 182 is further configured to obtain a last calculated check bit sequence; comparing the current calculation check bit sequence with the last calculation check bit sequence to obtain a comparison result; determining the current-time test value based on the comparison result.
In some embodiments, the determining module 182 is further configured to, if the comparison result indicates that the current calculated check bit sequence is the same as the last calculated check bit sequence, increase a check value of the last iterative decoding by a first preset value to obtain the current check value; and if the current reliability result is different from the last calculated check bit sequence, determining that the current check value is a second preset value.
In some embodiments, the determining module 182 is further configured to determine that the current parity check result is a check pass if the current calculated parity bit sequence is the same as the current parity bit sequence; otherwise, determining that the current checking result is that the checking is not passed.
In some embodiments, the determining module 182 is further configured to combine the current-time information bit sequence and the current-time calculated check bit sequence into a current-time check information sequence; the current time calculation check bit sequence is behind the current time information bit sequence; dividing the current time check information sequence by the current time check bit sequence to obtain a remainder; if the remainder is 0, determining that the current checking result is passed; otherwise, determining that the current checking result is that the checking is not passed.
In some embodiments, the termination detection condition includes at least one of: the current checking result is that the checking is passed, and the current checking value is greater than a first checking threshold value; the current time verification result is that the verification is not passed, and the current time verification value is greater than a second verification threshold value; the second verify threshold is greater than the first verify threshold; and the current iteration times of the iterative decoding are greater than the maximum iteration times.
In some embodiments, the decoding module 181 is further configured to obtain transmission information of the control channel; the transmission information corresponds to output data of an encoder; and carrying out iterative decoding based on the transmission information to obtain the current decoding result.
In some embodiments, the decoding module 181 is further configured to perform iterative decoding based on the transmission information to determine at least one survivor path at the current time; the at least one survivor path is used to characterize a complete transition process of the encoder from at least one starting state to a corresponding at least one ending state; determining the current coding result based on the current at least one survivor path.
In some embodiments, the coding module 181 is further configured to determine, based on the transmission information and the at least one end state, a corresponding at least one set of score metrics; each of the at least one set of scoring metrics comprises at least one scoring metric; the at least one score metric is used for characterizing at least one state transition process in one complete transition process corresponding to one corresponding end state; summing at least one score metric in each group of score metrics with the corresponding current initial path metric to obtain at least one path metric; wherein the at least one path metric is used as a next initial path metric; the at least one path metric is used to characterize the corresponding at least one survivor path.
In some embodiments, the coding module 181 is further configured to determine a largest path metric from the at least one path metric as a final survivor path; backtracking based on the final survivor path to obtain a current decoding sequence; determining the current time information bit sequence and the current time check bit sequence from the current time decoding sequence; and taking the current information bit sequence and the current check bit sequence as a current decoding result.
In some embodiments, the determining module 182 is further configured to obtain a current secondary reliability parameter based on the at least one path metric; the current reliability parameter is used for representing the reliability of the current decoding result; and determining the current check value based on the current decoding result and the current reliability parameter.
In some embodiments, the determining module 182 is further configured to determine a mean and a variance of the at least one path metric; and dividing the square of the mean value by the variance to obtain the reliability parameter.
In some embodiments, the determining module 182 is further configured to, if the current reliability parameter is smaller than the reliability threshold, increase the current first check value of the last iterative decoding by a third preset value to obtain the current first check value; determining the current second check value as a fourth preset value; and if the current reliability parameter is greater than or equal to the reliability threshold, determining the current first check value as the fourth preset value, and increasing the third preset value to the second check value of the last iterative decoding to obtain the current second check value.
In some embodiments, the termination detection condition includes at least one of: the current checking result is that the checking is passed, and the current second checking value is greater than a third checking threshold value; the current checking result is that the checking is not passed, and the current first checking value is greater than a fourth checking threshold value; and the current iteration times of the iterative decoding are greater than the maximum iteration times.
Fig. 9 is a first structural diagram of a communication device according to an embodiment of the present disclosure, and as shown in fig. 9, the communication device 19 includes a memory 1901, a processor 1902, and a computer program stored in the memory 1901 and operable on the first processor 1902; wherein the processor is configured to execute the method for detecting the control channel according to the foregoing embodiments when running the computer program.
It will be appreciated that the communication device 19 also includes a bus system 1903; the various components in the communication device 19 are coupled together by a bus system 1903. It is understood that the bus system 1903 is used to enable connected communication between these components. The bus system 1903 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
It will be appreciated that the memory in this embodiment can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic Random Access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced Synchronous DRAM), Direct Memory Access (DRAM), and Direct Memory Access (DRDRU). The memories described in the embodiments of the present application are intended to comprise, without being limited to, these and any other suitable types of memory.
The method disclosed in the embodiments of the present application may be applied to a processor, or may be implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor described above may be a general purpose processor, a DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The processor may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium having a memory and a processor reading the information in the memory and combining the hardware to perform the steps of the method.
The embodiment of the present application further provides a storage medium, on which a computer program is stored, where the computer program is executed by a processor when the storage medium is located in a communication device, and the computer program implements the steps in the detection method of the control channel according to the embodiment of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical function division, and in actual implementation, there may be other division manners, such as: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or modules may be electrical, mechanical or other.

Claims (19)

1. A method for detecting a control channel, comprising:
performing iterative decoding on the control channel to obtain a current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence;
determining a current check result and a current check value based on the current decoding result; the current check value is used for representing the credibility of the current check result;
decoding processing is carried out based on the current checking result, the current checking value and a termination detection condition; the termination detection condition is used to characterize a condition for terminating the iterative coding.
2. The method of claim 1, wherein the performing a decoding process based on the current-time check result, the current-time check value and a termination detection condition comprises:
if the current check result and the current check value meet the termination detection condition, determining to terminate the iterative decoding;
and if the current check result and the current check value do not meet the termination detection condition, determining to continue decoding for the next time.
3. The method of claim 2, wherein determining the current-time parity result and the current-time check value based on the current-time coding result comprises:
calculating based on the current information bit sequence to obtain a current calculation check bit sequence;
determining the current check result based on the current decoding result and the current calculation check bit sequence;
determining the current-time check value based on the current-time calculation check bit sequence.
4. The method of claim 3, wherein determining the current-time check value based on the current-time calculated check bit sequence comprises:
acquiring a last calculation check bit sequence;
comparing the current calculation check bit sequence with the last calculation check bit sequence to obtain a comparison result;
determining the current-time test value based on the comparison result.
5. The method of claim 4, wherein determining the current secondary test value based on the comparison comprises:
if the comparison result is that the current calculation check bit sequence is the same as the last calculation check bit sequence, increasing a first preset value to the check value of the last iterative decoding to obtain the current check value;
and if the current reliability result is different from the last calculated check bit sequence, determining that the current check value is a second preset value.
6. The method of claim 5, wherein determining the current-time parity check result based on the decoded result and the current-time calculated parity bit sequence comprises:
if the current calculation check bit sequence is the same as the current check bit sequence, determining that the current check result is a check pass; otherwise, determining that the current checking result is that the checking is not passed.
7. The method of claim 5, wherein determining the current-time parity check result based on the decoded result and the current-time calculated parity bit sequence comprises:
combining the current time information bit sequence and the current time calculation check bit sequence into a current time check information sequence; the current time calculation check bit sequence is behind the current time information bit sequence;
dividing the current time check information sequence by the current time check bit sequence to obtain a remainder;
if the remainder is 0, determining that the current checking result is passed; otherwise, determining that the current checking result is that the checking is not passed.
8. The method of any one of claims 1-7, wherein the termination detection condition comprises at least one of:
the current checking result is that the checking is passed, and the current checking value is greater than a first checking threshold value;
the current time verification result is that the verification is not passed, and the current time verification value is greater than a second verification threshold value; the second verify threshold is greater than the first verify threshold;
and the current iteration times of the iterative decoding are greater than the maximum iteration times.
9. The method according to any one of claims 1-7, wherein said iteratively decoding the control channel to obtain the current decoding result comprises:
acquiring transmission information of the control channel; the transmission information corresponds to output data of an encoder;
and carrying out iterative decoding based on the transmission information to obtain the current decoding result.
10. The method according to claim 9, wherein the performing iterative decoding based on the transmission information to obtain the current decoding result comprises:
performing iterative decoding based on the transmission information to determine at least one survival path at the current time; the at least one survivor path is used to characterize a complete transition process of the encoder from at least one starting state to a corresponding at least one ending state;
determining the current coding result based on the current at least one survivor path.
11. The method of claim 10, wherein iteratively decoding, based on the transmission information, to determine at least one survivor path of a current time comprises:
determining, based on the transmission information and the at least one end state, a corresponding at least one set of score metrics; each of the at least one set of scoring metrics comprises at least one scoring metric; the at least one score metric is used for characterizing at least one state transition process in a corresponding complete transition process;
summing at least one score metric in each group of score metrics with the corresponding current initial path metric to obtain at least one path metric; wherein the at least one path metric is used as a next initial path metric; the at least one path metric is used to characterize the corresponding at least one survivor path.
12. The method of claim 11, wherein said determining the current coding result based on the current at least one survivor path comprises:
determining a maximum path metric as a final survivor path from the at least one path metric;
backtracking based on the final survivor path to obtain a current decoding sequence;
determining the current time information bit sequence and the current time check bit sequence from the current time decoding sequence; and taking the current information bit sequence and the current check bit sequence as a current decoding result.
13. The method of claim 12, wherein after determining the current parity check result based on the decoding result and the current computed parity bit sequence, the method further comprises:
obtaining a current reliability parameter based on the at least one path metric; the current reliability parameter is used for representing the reliability of the current decoding result;
determining the current-time check value based on the current-time reliability parameter.
14. The method of claim 13, wherein obtaining the current secondary reliability parameter based on the at least one path metric comprises:
determining a mean and a variance of the at least one path metric;
and dividing the square of the mean value by the variance to obtain the reliability parameter.
15. The method of claim 14, wherein the current-time check value comprises a current-time first check value and a current-time second check value; the determining the current-time check value based on the decoding result and the reliability parameter comprises:
if the current reliability parameter is smaller than the reliability threshold, increasing a third preset value to the first check value of the last iterative decoding to obtain the current first check value; determining the current second check value as a fourth preset value;
and if the current reliability parameter is greater than or equal to the reliability threshold, determining the current first check value as the fourth preset value, and increasing the third preset value to the second check value of the last iterative decoding to obtain the current second check value.
16. The method of claim 15, wherein the termination detection condition comprises at least one of:
the current checking result is that the checking is passed, and the current second checking value is greater than a third checking threshold value;
the current checking result is that the checking is not passed, and the current first checking value is greater than a fourth checking threshold value;
and the current iteration times of the iterative decoding are greater than the maximum iteration times.
17. An apparatus for detecting a control channel, comprising:
the decoding module is used for carrying out iterative decoding on the control channel to obtain a current decoding result; the current decoding result comprises a current information bit sequence and a current check bit sequence;
a determining module, configured to determine a current check result and a current check value based on the current decoding result; the current check value is used for representing the credibility of the current check result;
the processing module is used for carrying out decoding processing based on the current checking result, the current checking value and a termination detection condition; the termination detection condition is used to characterize a condition for terminating the iterative coding.
18. A communication device, the device comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to perform the steps of the method of any one of claims 1 to 16 when running the computer program.
19. A storage medium having one or more computer programs stored thereon that are executable by one or more processors to perform the steps of the method of any one of claims 1 to 16.
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