WO2022042473A1 - 一种盲检测方法、装置、终端及存储介质 - Google Patents

一种盲检测方法、装置、终端及存储介质 Download PDF

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WO2022042473A1
WO2022042473A1 PCT/CN2021/114036 CN2021114036W WO2022042473A1 WO 2022042473 A1 WO2022042473 A1 WO 2022042473A1 CN 2021114036 W CN2021114036 W CN 2021114036W WO 2022042473 A1 WO2022042473 A1 WO 2022042473A1
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sequences
sequence
pbch
ssb
synchronization signal
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English (en)
French (fr)
Chinese (zh)
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赵丽娟
张骏凌
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ZTE Corp
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ZTE Corp
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Priority to KR1020227044397A priority Critical patent/KR102739723B1/ko
Priority to US18/015,756 priority patent/US12627399B2/en
Priority to JP2022572723A priority patent/JP7648657B2/ja
Priority to EP21860308.2A priority patent/EP4195545A4/en
Publication of WO2022042473A1 publication Critical patent/WO2022042473A1/zh
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    • 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
    • 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
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • 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
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • 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
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • 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
    • H04L1/0072—Error control for data other than payload data, e.g. control data
    • 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
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1642—Formats specially adapted for sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • 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
    • H04L1/0041—Arrangements at the transmitter end

Definitions

  • Embodiments of the present disclosure relate to, but are not limited to, wireless communication networks, and in particular, relate to a blind detection method, device, terminal, and storage medium.
  • a terminal Before a terminal (User Equipment, UE) accesses a cell, it needs to obtain the master system information (Master Information Block, MIB) of the cell by detecting the physical broadcast channel (Physical Broadcast Channel, PBCH), in order to know how the cell is configured, in order to work correctly in the cell.
  • MIB Master Information Block
  • PBCH Physical Broadcast Channel
  • the PBCH payload is mapped to a Synchronization Signal/PBCH Block (SSB) for transmission after interleaving, scrambling, checking, etc.
  • SSB Synchronization Signal/PBCH Block
  • the UE obtains information such as MIB and SSB index by performing blind detection on the PBCH information, and can further complete radio frame timing, half-frame timing, and time slot timing.
  • the system frame number (SFN) information of different periods is also different, so it cannot be effectively combined.
  • the soft information obtained by direct merging has a low signal-to-noise ratio, and requires too many combinations of blind detection, complex calculation, and low efficiency of blind detection.
  • Embodiments of the present disclosure provide a blind detection method, device, terminal, and storage medium, so as to improve the signal-to-noise ratio of information combining and the efficiency of blind detection.
  • An embodiment of the present disclosure provides a blind detection method, including: according to SFN information, detecting a PBCH received through an SSB in a target beam direction in at least one synchronization signal period within a Transmission Time Interval (TTI) Unmasking the information to obtain at least one set of unmasking sequences; determining a combined sequence according to the at least one set of unmasking sequences; verifying the decoding result of the combined sequence;
  • the SFN information extracts a master information block (Master Information Block, MIB) from the decoding result to complete blind detection of the PBCH information.
  • MIB Master Information Block
  • An embodiment of the present disclosure further provides an apparatus for blind detection, comprising: an unmasking module configured to, according to SFN information, detect at least one synchronization signal period received by an SSB in a target beam direction within a transmission time interval
  • the PBCH information is unmasked to obtain at least one set of unmasked sequences
  • the combining module is configured to determine the combined sequence according to the at least one set of unmasked sequences
  • the verification module is configured to decode the result of the combined sequence. performing verification
  • an extraction module configured to extract MIB from the decoding result according to the SFN information when the verification is successful, so as to complete the blind detection of the PBCH information.
  • An embodiment of the present disclosure also provides a terminal, including: one or more processors; and a storage device for storing one or more programs, wherein when the one or more programs are stored by the one or more programs The processor executes such that the one or more processors implement the blind detection method described above.
  • An embodiment of the present disclosure also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the program is executed by a processor, the above-mentioned blind detection method is implemented.
  • Embodiments of the present disclosure provide a blind detection method, device, terminal, and storage medium.
  • the method unmasks the PBCH information received by the SSB in the direction of the target beam in at least one synchronization signal period within a transmission time interval to obtain at least one set of unmasking sequences; according to the at least one The unmasking sequence is assembled to determine the merging sequence; the decoding result of the merging sequence is checked; if the check is successful, the MIB is extracted from the decoding result according to the system frame number information to complete the blind detection of the PBCH information.
  • the difference between the PBCH information received by SSB in different synchronization signal periods in one transmission time interval can be eliminated, so as to realize soft combining and improve the signal-to-noise ratio of information combining;
  • Combining the PBCH information received by the SSB in the direction of the target beam within one synchronization signal period can reduce the number of combinations and the number of combinations of blind detection, thereby improving the efficiency of blind detection.
  • 1 is a flowchart of a blind detection method provided by an embodiment
  • FIG. 2 is a schematic diagram of specific bit and SSB mapping provided by an embodiment
  • FIG. 3 is a schematic diagram of a method for generating a mask sequence based on SFN information provided by an embodiment
  • FIG. 5 is a schematic diagram of the implementation of a blind detection method provided by an embodiment
  • FIG. 6 is a schematic structural diagram of a blind detection device according to an embodiment.
  • FIG. 7 is a schematic diagram of a hardware structure of a terminal according to an embodiment.
  • each SSB includes a primary synchronization signal, a secondary synchronization signal, a PBCH, and a demodulation reference signal (Demodulation Reference Signal, DMRS) corresponding to the PBCH, corresponding to one beam direction.
  • DMRS Demodulation Reference Signal
  • the base station transmits multiple SSBs in the form of beam polling during the synchronization signal period.
  • the multiple SSBs in the synchronization signal period are located in half a radio frame and form an SSB set, and the SSBs in one SSB set are The beam direction of each SSB covers the entire cell.
  • the UE can determine the physical cell identity and the SSB symbol boundary aligned with the beam of the UE. On this basis, blind detection is performed for PBCH information (ie, for PBCH).
  • PBCH information ie, for PBCH.
  • the UE can obtain MIB, SFN information, field indication and SSB index by detecting the PBCH, thereby completing radio frame timing and field timing.
  • the UE can determine the time slot and symbol where the current synchronization signal is located according to the SSB index and the pattern of the SSB set used by the current frequency band, thereby completing the time slot timing.
  • the TTI of the PBCH is 80 milliseconds (ms), and the synchronization signal period may be 5ms, 10ms, 20ms, etc. Correspondingly, one TTI may contain 16, 8 or 4 synchronization signal periods.
  • one SSB set contains at most Lmax SSBs, and Lmax is related to the size of the carrier frequency.
  • Lmax is related to the size of the carrier frequency.
  • Each SSB is composed of 4 orthogonal frequency division multiplexing (Orthogonal frequency division multiplexing, OFDM) symbols, and each SSB includes a PBCH. Therefore, one TTI may contain 16*Lmax, 8*Lmax or 4*Lmax equal parts PBCH.
  • a single received PBCH can be directly demodulated. If the demodulation of the currently received PBCH succeeds, the PBCH demodulation is ended; if the demodulation of the currently received PBCH fails, the next reception is performed, and an attempt is made to combine the next received PBCH with the currently received PBCH. Since the PBCHs received twice may belong to different TTIs, they cannot be combined in this case. Therefore, two blind detection combinations need to be tried, ie a combination of two received PBCH attempts, or no combination is attempted.
  • LTE Long Term Evolution
  • PBCH1 PBCH1
  • PBCH2 PBCH2
  • PBCH1 and PBCH2 may belong to different TTIs, it is necessary to try to combine PBCH1 and PBCH2, or to demodulate PBCH2 separately, so there are two blind detection combinations.
  • PBCH4 is combined, and the possible blind detection combinations include eight.
  • one TTI may contain 16*Lmax, 8*Lmax or 4*Lmax equal parts of PBCH, the number of combinations required for blind detection is too many, the amount of calculation is large, the efficiency of blind detection is low, and the complexity of PBCH demodulation by the terminal is high.
  • the UE assumes that the period of the synchronization signal is 20ms during the initial access process. Unless otherwise specified, the embodiment of the present disclosure takes the case of 20ms (that is, one TTI includes 4 periods of the synchronization signal and 4*Lmax equal parts of the PBCH) as an example. The process of blind detection of information is described.
  • a blind detection method through which the difference between PBCH information received through SSB in different synchronization signal periods can be eliminated by demasking, thereby realizing soft combining and improving the signal-to-noise ratio of information combining; And by combining the PBCH information received by the SSB in the target beam direction in multiple synchronization signal periods within a transmission time interval, the number of combining times and the number of combinations of blind detection can be reduced, thereby improving the efficiency of blind detection.
  • FIG. 1 is a flowchart of a blind detection method provided by an embodiment. This method can be applied to a terminal. As shown in FIG. 1 , the method provided by this embodiment includes steps 110-140.
  • step 110 according to the SFN information, the PBCH information received by the SSB in the target beam direction in at least one synchronization signal period within a transmission time interval is demasked to obtain at least one set of demasking sequences.
  • step 120 a merging sequence is determined according to the at least one set of unmasking sequences.
  • the PBCH information received by the SSB in the target beam direction that is, the beam direction aligned with the UE
  • the PBCH information is demasked based on the SFN information to eliminate the difference in the SFN information.
  • the different bits in each SFN information are made consistent, so as to obtain a set of unmasking sequences for the SSB, so that the PBCH information received by the SSB in different synchronization signal periods is consistent, and the basis for realizing soft combining is established.
  • step 130 the decoding result of the combined sequence is checked.
  • step 140 when the verification is successful, MIB is extracted from the decoding result according to the SFN information, so as to complete the blind detection of the PBCH information.
  • polar code (Polar) decoding and checking are performed on the combined sequences. If the verification is successful, it is determined that the detection of the PBCH is successful.
  • the decoding result obtained by performing polar code decoding on the combined sequence since the difference information of the SFN information of the SSB in different synchronization signal periods is not carried, the accurate MIB message cannot be extracted, and the radio frame timing and half-time cannot be completed. frame timing.
  • the related information of the SFN information eliminated in the unmasking process can be considered, and an accurate and complete decoding result can be obtained, thereby extracting an accurate MIB message and completing the blind detection of the PBCH information.
  • the combined sequence may be obtained by combining multiple sets of unmasking sequences, or may be composed of a set of unmasking sequences.
  • the first group of demasking sequences obtained in the first synchronization signal period of one TTI can be directly used as the combining sequence.
  • the UE does not know which SSB is aligned with the beam direction of the UE, that is, does not know the index of the SSB aligned with the beam direction of the UE. Therefore, it is necessary to traverse the index of the SSB, and perform demasking, decoding and verification on each SSB, until the verification is successful, the SSB can be determined.
  • step 110 further includes:
  • Step 1110 Generate J groups of mask sequences based on SFN information according to the TTI and the synchronization signal period, where J is a positive integer;
  • Step 1120 Determine L candidate SSB indexes according to the lower 3 bits of the SSB index, or determine L candidate SSB indexes according to the lower 2 bits of the SSB index and the field indication bits, where L is a positive integer, and each candidate SSB index Corresponds to a PBCH DMRS sequence and a secondary scrambling sequence.
  • Step 1130 Calculate a set of log-likelihood ratio (Log-Likelihood Ratio, LLR) sequences for each candidate SSB index respectively.
  • LLR log-likelihood Ratio
  • Step 1140 Unmask the LLR sequence by using J groups of mask sequences respectively to obtain J groups of unmasked sequences until the verification succeeds.
  • Each SSB candidate index corresponds to a set of LLR sequences.
  • the LLR sequence is obtained by channel estimation on the PBCH according to the DMRS sequence generated by the SSB candidate index, and performing equalization, demodulation, descrambling and rate matching on the channel estimation results. , the LLR sequence can be used for soft combining after demasking.
  • the number of candidate SSB indexes is denoted as L, and the number of groups of LLR sequences is also L.
  • L can be determined according to a specific bit in the SFN information.
  • channel estimation is performed on the PBCH according to the corresponding DMRS sequence, and the signal at the subcarrier position is obtained, and the signal is equalized and demodulated, thereby obtaining L groups of initial sequences (with a length of 864).
  • each group of initial sequences is de-scrambled and rate-matched by using the corresponding second-level scrambling sequence to obtain the corresponding LLR sequence (length is 512).
  • L*J groups of unmasked sequences can be obtained.
  • this embodiment does not limit the execution order of step 1110 and step 1130 .
  • the stage of decoding and extracting MIB based on SFN information can be entered, and there is no need to unmask the remaining SSB indices.
  • the SFN information (10 bits in total) is recorded as (s9, . ...,b0).
  • FIG. 2 is a schematic diagram of specific bit and SSB mapping provided by an embodiment.
  • the logical channel Broadcast Control Channel BCCH
  • BCH transport channel Broadcast Channel
  • Downlink Shared Channel Downlink Shared Channel
  • DL-SCH Downlink Shared Channel
  • the PBCH payload is composed of BCCH-BCH information (32 bits) and time-related PBCH parameters (8 bits), with a total of 32 bits.
  • the time-related PBCH parameters include the lower 4 bits (s3, s2, s1) of the SFN information.
  • the 32-bit bits of the PBCH payload are interleaved, first-level scrambling, adding 24-bit Cyclic Redundancy Check (CRC), polar code encoding (512-bit), rate matching (864-bit), and second-level adding.
  • CRC Cyclic Redundancy Check
  • QPSK Quadrature Phase Shift Keying
  • the lower 3 bits of the SFN information corresponding to each SSB in different synchronization signal periods are different, or the lower 2 bits of the corresponding SFN information are different from the half frame indication.
  • step 1110 further includes:
  • First-level scrambling, CRC addition of cyclic redundancy check codes, and polar code encoding are performed on each of the bit sequences to obtain corresponding J groups of mask sequences.
  • J groups of mask sequences based on SFN information are generated according to specific bits, which are used to unmask the LLR sequences of the L candidate SSB indices.
  • a specific bit is represented as (k3, k2, k1, k0).
  • the synchronization signal period is 20ms
  • the second and second bits of the Least Significant Bit (LSB) of the SFN information in the MIB information in the same SSB 3 bits are different, while the field indication is the same.
  • the period of the synchronization signal is 80ms or 160ms, soft combining cannot be performed, and there is no need to generate a mask sequence.
  • FIG. 3 is a schematic diagram of a method for generating a mask sequence based on SFN information according to an embodiment.
  • a 32-bit bit sequence is generated according to (k3, k2, k1, k0): a0, a1, ... a31.
  • the remaining bits of this bit sequence are set to 0.
  • the first-level scrambling is performed on the bit sequence a0, a1, ... a31.
  • a CRC is added to the first-level scrambled bit sequence, and then Polar coding is performed to generate a mask sequence.
  • the blind detection method further includes:
  • Step 1112 generate a PBCH DMRS sequence according to each value of the lower 3 bits of the SSB index, or generate a PBCH DMRS sequence according to each value of the lower 2 bits of the SSB index and the half frame indication bit, obtain L PBCH DMRS sequences;
  • L two-level scrambling sequences are generated.
  • each candidate SSB index corresponds to a PBCH DMRS sequence and a secondary scrambling sequence
  • step 1120 further includes:
  • the initial sequence is de-scrambled and rate-matched by the secondary scrambling sequence corresponding to each candidate SSB index to obtain the LLR sequence corresponding to each candidate SSB index.
  • L groups of initial sequences can be obtained;
  • the corresponding second-level scrambling sequence is used to perform de-second-level scrambling and rate-matching, so as to obtain a set of LLR sequences corresponding to each candidate SSB sequence.
  • the initialization of the PBCH DMRS sequence is related to the lower 3 bits of the SSB index, or is related to the lower 2 bits of the SSB index and 1 bit of the half frame indication.
  • the second-level scrambling sequence of the PBCH is related to the lower 3 bits of the SSB index, or is related to the lower 2 bits of the SSB index.
  • step 1120 of this embodiment after the UE performs two-level scrambling and rate matching for each group of initial sequences, L groups of LLR sequences are obtained, denoted as
  • step 1130 of the blind detection method includes:
  • step 120 further includes:
  • the J groups of demasking sequences corresponding to each candidate SSB index in each synchronization signal period are accumulated with the current LLR buffer data.
  • step 120 further includes:
  • the current LLR buffer data is updated to J groups of unmasking sequences corresponding to each candidate SSB index in the synchronization signal period.
  • the current LLR cache data can be directly replaced with L*J groups of unmasking sequences for storage, and used as the current LLR cache data of the next TTI for merging with the unmasking sequence calculated in the next TTI.
  • step 130 further includes:
  • Step 1310 Perform polar code decoding on the combined sequence to obtain a decoding result
  • Step 1320 Perform a CRC check on the decoding result
  • Step 1330 If the CRC check is passed, perform a second check on the decoding result.
  • Polar decoding is performed on the result of combining the L*J group unmasking sequence with the current LLR buffer data, and the decoding result is double-checked to avoid false detection and improve the reliability of blind detection.
  • CRC check and secondary check are respectively performed on the decoded result. For example, CRC check is performed first. If the CRC check is successful, perform a second check. If the secondary verification is also successful, it means that the PBCH blind detection is successful, and the MIB can be extracted. If any one of the verifications is unsuccessful, it means that the blind detection of the PBCH is unsuccessful, and the detection is continued for the next synchronization signal cycle.
  • the demasking, soft combining, and decoding processes in the above embodiment are repeated until both checks on the decoding result are successful.
  • the secondary check is set according to the XOR operation of the unmasking process, and the check can be passed only if the bit sequence in the decoding result conforms to the result of the XOR operation of the unmasking process.
  • the secondary verification is successful: the bits corresponding to the specific bits in the decoding result are all 0, and the bits of the decoding result are not all 0.
  • the secondary check is based on the following principle: when a specific bit (belonging to the lower 3 bits of the SFN information and the field indication) is consistent with the corresponding bit in the bit sequence used to generate the mask sequence, due to the solution
  • the XOR operation is used in the masking process, and the corresponding bits in the decoding result should be 0.
  • CRC CRC check
  • p0, p1, ..., p31 the sequence formed by the remaining bits except the CRC check
  • the decoding result may not be checked twice.
  • the TTI is 80ms
  • the synchronization signal period is 10ms
  • the synchronization signal period is 10ms
  • the UE needs to determine whether the corresponding 3 bits in the decoding result are 0, that is, the second verification is successful.
  • step 140 further includes:
  • Step 1410 Complement the SFN information in the decoding result.
  • Step 1420 Extract MIB from the complemented decoding result.
  • the bits of the SFN information used in the process of generating the corresponding mask sequence are backfilled for the decoding result of the successful PBCH detection.
  • accurate SFN information can be obtained, MIB can be extracted accurately, radio frame timing, half frame timing and time slot timing can be completed, so as to complete the blind detection of PBCH information.
  • step 1410 further includes:
  • n is the index of the synchronization signal period corresponding to the verification success
  • j is The index of the mask sequence corresponding to the successful verification.
  • the sequence consisting of bits other than the CRC verification is denoted as p0, p1, ..., p31, and the specific bits used to generate the mask sequence can be determined according to the period of the synchronization signal. .
  • the mask sequence d (n-1+j)%J is used for demasking, then the (s2, s1) corresponding to d (n-1+j)%J is backfilled into the decoding result
  • the PBCH detection is successful, it corresponds to the nth synchronization signal cycle and the jth group of mask sequences. In this case, the mask sequence is used.
  • the MIB can be further extracted for p0, p1,...,p31.
  • the PBCH detection is successful, it corresponds to the nth synchronization signal period and the jth group of mask sequences.
  • the mask sequence d (n-1+j)%J is used to unmask, then the value of (s2,s1,s0,c0) corresponding to d (n-1+j)%J
  • the specific bit is s2, and there are two kinds of values.
  • the mask sequence d (n-1+j)%J is used to unmask, then the value of (s2,s1,s0,c0) corresponding to d (n-1+j)%J
  • the synchronization signal period is 80ms or 160ms, there is no unmasking operation and no backfilling, and MIB can be directly extracted from the decoding result.
  • the SFN information in the MIB information in the same SSB on different synchronization signal periods has different LSB low 3 bits (s2, s1, s0) and half frame indication (c0).
  • FIG. 4 is a flowchart of a blind detection method provided by another embodiment. This embodiment is described by taking the blind detection of all synchronization signal periods in one TTI as an example. If after traversing each candidate SSB index for the SSB in the target beam direction in each synchronization signal period in one TTI, and traversing each mask sequence under each candidate SSB index for unmasking, the PBCH detection is still unsuccessful. , then continue to receive PBCH information, and enter the blind detection in the next TTI. As shown in Figure 4, the blind detection method includes the following steps:
  • Step 202 Perform secondary de-scrambling and de-rate matching on L groups of initial sequences respectively to obtain L groups of LLR sequences;
  • Step 203 According to the TTI and the synchronization signal period, traverse the values of specific bits to generate J groups of mask sequences based on SFN information;
  • Step 204 using J groups of mask sequences based on the SFN information to unmask L groups of LLR sequences respectively, to obtain L*J groups of unmasked sequences;
  • Step 205 determine whether the current synchronization signal period is in the same TTI as the current LLR buffer data; if so, go to step 206; otherwise, go to step 212;
  • Step 206 combine the L*J group unmasking sequence with the current LLR cache data, and store the combined L*J group unmasking sequence as new LLR cache data;
  • Step 207 Decode the LLR cache data (that is, the L*J group unmasking sequence merged in step 206, or the L*J group unmasking sequence replaced in step 212);
  • Step 208 perform CRC check and secondary check on the decoding result
  • Step 209 Is the CRC check and the secondary check successful? If yes, go to step 210; otherwise go to step 213;
  • Step 210 Assign the value of the specific bit corresponding to the successfully verified mask sequence to the corresponding bit in the decoding result, so as to supplement the SFN information in the decoding result.
  • Step 211 Extract the MIB from the decoding result of the supplemented SFN information to complete the blind detection of the PBCH information.
  • Step 212 Replace the current LLR cache data with L*J groups of unmasked sequences, and store the L*J groups of unmasked sequences as new (corresponding to the next TTI) LLR cache data.
  • Step 213 Continue to receive the PBCH information of the next synchronization signal cycle, and repeat steps 201-211.
  • the LLR sequence obtained by demodulating the PBCH information received by the SSB aligned with the UE beam in different synchronization signal periods in one TTI, and then demasking and combining eliminates the difference of the SFN information. , which improves the signal-to-noise ratio of PBCH demodulation.
  • only 8 SSB indexes need to be traversed, and only 16 SFN information combinations need to be traversed at most under each SSB, so only 128 blind detection combinations need to be performed at most, and there is no need for different SSB sets and each SSB set.
  • Each SSB performs soft combining, which reduces the number of blind detection combinations, reduces the complexity of PBCH demodulation, and improves blind detection efficiency.
  • a second check is also performed for the unmasking operation. Only when both checks are successful can the PBCH detection be determined to be successful, which reduces the probability of false detection of PBCH and improves blind detection. reliability.
  • FIG. 5 is a schematic diagram of the implementation of a blind detection method provided by an embodiment.
  • This embodiment describes a blind detection scenario in which each synchronization signal period, each candidate SSB index, and each mask sequence are used for demasking within one TTI. If the verification is successful in the case of the nth synchronization signal period, the lth candidate SSB index, and the jth mask sequence for unmasking, the PBCH detection is successful; otherwise, the above three parameters need to be traversed until the PBCH The detection is successful, or the blind detection in the next TTI is entered.
  • the implementation process of the blind detection method is as follows:
  • the unmasked sequences are merged to obtain a merged sequence with a length of 512.
  • the PBCH detection is still unsuccessful after traversing the J groups of mask sequences, then traverse the L candidate SSB indices, and generate the corresponding LLR sequences through demodulation, descrambling, and rate matching, and use the J mask sequences to pair the LLRs.
  • the sequence performs the operations of demasking, merging, decoding, and checking until the PBCH detection is successful.
  • the TTI is 80ms
  • the period of the synchronization signal when the cell is initially accessed is 20ms
  • the primary synchronization and secondary synchronization signals can be detected to determine the physical cell identity and the symbol boundary of the SSB aligned with the beam of the UE.
  • the maximum number of merging times is 4 times. After combining, the signal-to-noise ratio can be improved by 6dB. At most 32 blind detection combinations are required, which greatly reduces the complexity of PBCH demodulation.
  • Embodiments of the present disclosure also provide a blind detection device.
  • Fig. 6 is a schematic structural diagram of a blind detection device provided by an embodiment. As shown in FIG. 6 , the blind detection apparatus includes: an unmasking module 310 , a combining module 320 , a checking module 330 and an extracting module 340 .
  • the unmasking module 310 is configured to, according to the system frame number SFN information, unmask the PBCH information received by the SSB in the target beam direction in at least one synchronization signal period within a transmission time interval, to obtain at least one set of unmasked sequence;
  • the combining module 320 is configured to perform soft combining on the demasking sequence to obtain a combined sequence
  • a verification module 330 configured to verify the decoding result of the combined sequence
  • the extracting module 340 is configured to extract MIB from the decoding result according to the SFN information when the verification is successful, so as to complete the blind detection of the PBCH information.
  • the difference between the PBCH information received by the SSB in different synchronization signal periods can be eliminated by unmasking, thereby realizing soft combining and improving the signal-to-noise ratio of information combining;
  • Soft combining is performed on the PBCH information received by the SSB in the target beam direction within multiple synchronization signal cycles, which can reduce the number of combining times and the number of combinations of blind detection, thereby improving the efficiency of blind detection.
  • the demasking module 310 further includes:
  • a mask sequence generation module configured to generate J groups of mask sequences based on SFN information according to the transmission time interval and the synchronization signal period, where J is a positive integer;
  • the candidate index determination module is configured to determine L candidate SSB indexes according to the lower 3 bits of the SSB index, or determine L candidate SSB indexes according to the lower 2 bits of the SSB index and the field indication bits, where L is a positive integer, Each candidate SSB index corresponds to a PBCH DMRS sequence and a secondary scrambling sequence;
  • An LLR computation module configured to compute, for each candidate SSB index, a set of LLR sequences
  • the information unmasking module is configured to use J groups of mask sequences to unmask the LLR sequences respectively to obtain J groups of unmasked sequences until the verification succeeds.
  • the mask sequence generation module is further configured to:
  • a bit sequence is generated according to each value of a specific bit, wherein the specific bit belongs to the lower 3 bits of the SFN information and the half-frame indication bit;
  • First-level scrambling, CRC addition of cyclic redundancy check codes, and polar code encoding are performed on each of the bit sequences to obtain corresponding J groups of mask sequences.
  • the blind detection device further includes:
  • the DMRS sequence generation module is configured to generate a PBCH DMRS sequence according to each value of the lower 3 bits of the SSB index, or generate a PBCH DMRS sequence according to each value of the lower 2 bits of the SSB index and the half frame indication bit a PBCH DMRS sequence, resulting in L PBCH DMRS sequences;
  • the second-level scrambling sequence generation module is configured to generate L two-level scramblings according to each value of the lower 3 bits of the SSB index, or according to each value of the lower 2 bits of the SSB index, respectively sequence.
  • the LLR computing module is further configured to:
  • the initial sequence is de-scrambled and rate-matched by the secondary scrambling sequence corresponding to each candidate SSB index to obtain the LLR sequence corresponding to each candidate SSB index.
  • the information demasking module is further configured to:
  • each set of mask sequences perform XOR operation on each set of LLR sequences to obtain at least one set of unmasked sequences.
  • the merging module 320 is further configured to:
  • the J groups of demasking sequences corresponding to each candidate SSB index in each synchronization signal period are accumulated with the current LLR buffer data.
  • the merging module 320 is further configured to:
  • the current LLR buffer data is updated to J groups of unmasking sequences corresponding to each candidate SSB index in the synchronization signal period.
  • the verification module 330 further includes:
  • a decoding module configured to perform polar code decoding on the combined sequence to obtain a decoding result
  • a first check module configured to perform a CRC check on the decoding result
  • the second verification module is configured to perform secondary verification on the decoding result when the CRC verification is passed.
  • the secondary verification is successful:
  • bits corresponding to the specific bits in the decoding result are all 0, and the bits of the decoding result are not all 0.
  • the extraction module 340 further includes:
  • a complementing module configured to complement the SFN information in the decoding result
  • the MIB extraction module is configured to extract MIBs from the complemented decoding result.
  • the backfilling module is further configured to:
  • n is the index of the synchronization signal cycle corresponding to the successful verification
  • j is The index of the mask sequence corresponding to the successful verification.
  • the blind detection device proposed in this embodiment and the blind detection method applied to the second node proposed in the above embodiment belong to the same inventive concept.
  • the embodiments of the present disclosure also provide a terminal.
  • the above-mentioned blind detection method applied to a terminal may be performed by a blind detection apparatus, and the blind detection apparatus may be implemented by means of software and/or hardware and integrated in the terminal.
  • the terminal may be a mobile device that can communicate with the network side, such as a mobile phone, a notebook, and a tablet computer.
  • FIG. 7 is a schematic diagram of a hardware structure of a terminal according to an embodiment.
  • a terminal provided in this embodiment includes: a processor 410 and a storage device 420 .
  • One or more processors may be provided in the terminal.
  • a processor 410 is used as an example, and the processor 410 and the storage device 420 in the device may be connected through a bus or in other ways.
  • the connection through a bus is used as an example.
  • the one or more programs are executed by the one or more processors 410, so that the one or more processors implement the blind detection method applied to a terminal described in any of the foregoing embodiments.
  • the storage device 420 in the terminal may be used to store one or more programs, and the programs may be software programs, computer-executable programs, and modules, such as those applied to the terminal in the embodiments of the present invention.
  • Program instructions/modules corresponding to the blind detection method include: an unmasking module 310 , a merging module 320 , a verification module 330 and an extraction module 340 ).
  • the processor 410 executes various functional applications and data processing of the terminal by running the software programs, instructions and modules stored in the storage device 420 , that is, to implement the blind detection method in the above method embodiments.
  • the storage device 420 mainly includes a stored program area and a stored data area, wherein the stored program area can store the operating system and the application program required by at least one function; the stored data area can store data created according to the use of the device, etc. The unmasking sequence in the example, the decoding result, etc.). Additionally, storage device 420 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the storage device 420 may further include memories located remotely from the processor 410, and these remote memories may be connected to the terminal through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.
  • the one or more programs included in the above-mentioned terminal are executed by the one or more processors 410, the following operations are implemented: according to the SFN information, for at least the SSB in the direction of the target beam within one transmission time interval
  • the PBCH information received in one synchronization signal cycle is de-masked to obtain at least one set of de-masking sequences; the de-masking sequences are soft-combined to obtain a combined sequence; the decoding result of the combined sequence is checked; In the case of successful verification, MIB is extracted from the decoding result according to the SFN information, so as to complete the blind detection of the PBCH information.
  • the terminal proposed in this embodiment belongs to the same inventive concept as the blind detection method or the query method applied to the terminal proposed in the above-mentioned embodiment.
  • For technical details not described in detail in this embodiment please refer to any of the above-mentioned embodiments, and this embodiment has Same beneficial effect as performing blind detection methods.
  • Embodiments of the present disclosure also provide a storage medium containing computer-executable instructions, which are used to execute a blind detection method when executed by a computer processor.
  • the method includes: according to the SFN information, unmasking the PBCH information received by the SSB in the direction of the target beam in at least one synchronization signal period within a transmission time interval to obtain at least one set of unmasking sequences; The sequences are softly combined to obtain a combined sequence; the decoding result of the combined sequence is verified; in the case of successful verification, MIB is extracted from the decoding result according to the SFN information to complete the PBCH information blind detection.
  • the present disclosure can be implemented by means of software and general-purpose hardware, and can also be implemented by hardware.
  • the technical solutions of the present disclosure can be embodied in the form of software products, and the computer software products can be stored in a computer-readable storage medium, such as a floppy disk of a computer, a read-only memory (Read-Only Memory, ROM), Random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a plurality of instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to execute any The blind detection method described in the embodiment.
  • a computer-readable storage medium such as a floppy disk of a computer, a read-only memory (Read-Only Memory, ROM), Random access memory (Random Access Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc.
  • the block diagrams of any logic flow in the figures of the present disclosure may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions.
  • Computer programs can be stored on memory.
  • the memory may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology such as, but not limited to, read only memory (ROM), random access memory (RAM), optical memory devices and systems (Digital Versatile Discs). DVD or CD disc) etc.
  • Computer-readable media may include non-transitory storage media.
  • the data processor may be of any type suitable for the local technical environment, such as, but not limited to, a general purpose computer, special purpose computer, microprocessor, digital signal processor (DSP), application specific integrated circuit (ASIC), programmable logic device (FGPA) and processors based on multi-core processor architectures.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FGPA programmable logic device

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