CN109474369B - Physical broadcast channel demodulation method, device, readable storage medium and user terminal - Google Patents

Physical broadcast channel demodulation method, device, readable storage medium and user terminal Download PDF

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CN109474369B
CN109474369B CN201710800805.8A CN201710800805A CN109474369B CN 109474369 B CN109474369 B CN 109474369B CN 201710800805 A CN201710800805 A CN 201710800805A CN 109474369 B CN109474369 B CN 109474369B
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synchronous signal
synchronization signal
pbch
burst set
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CN109474369A (en
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赵东鹤
田文强
黄甦
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Spreadtrum Communications Shanghai Co Ltd
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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
    • H04L1/0056—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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements

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Abstract

A physical broadcast channel demodulation method, a device, a readable storage medium and a user terminal are provided, wherein the demodulation method comprises the following steps: determining the boundary of a synchronous signal burst set according to the detected synchronous signal block; for each synchronization signal block in the jth synchronization signal burst set, performing PBCH demodulation in the following manner until CRC check is successful, otherwise, iteratively executing to the last synchronization signal block in the jth synchronization signal burst set: carrying out PBCH demodulation on the ith synchronous signal block, and carrying out CRC check on a PBCH demodulation result corresponding to the ith synchronous signal block; when the CRC fails, calculating the input of a PBCH decoder corresponding to the next synchronous signal block, and performing soft combination with the calculated input of the PBCH decoder; and after the soft combination is finished, performing CRC on the PBCH decoding result corresponding to the obtained soft combination result again. The scheme can reduce the blind detection combination corresponding to PBCH soft combining and reduce the complexity.

Description

Physical broadcast channel demodulation method, device, readable storage medium and user terminal
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for demodulating a physical broadcast channel, a readable storage medium, and a user terminal.
Background
In a Long Term Evolution (LTE) system, a Transmission Time Interval (TTI) of a Physical Broadcast Channel (PBCH) is 40ms and occupies 4 consecutive radio frames. In one TTI, PBCH is transmitted in total of 4. Each part can be demodulated independently, and meanwhile, the demodulation performance can be improved by the 4 parts of PBCH in one TTI in a soft combining mode. In LTE, soft combining of 4 PBCH within one PBCH TTI results in a total of 15 blind detection combinations.
In the design of the 5G New air interface (NR), the TTI of PBCH is 80 ms. The period of the Synchronization Signal Burst Set (Synchronization Signal Burst Set) can be 5ms, 10ms, 20ms and the like, and the occupied time interval is 5 ms. Thus, one PBCH TTI may contain 16, 8, or 4 sets of synchronization signal bursts.
In order to adapt to the high-frequency multi-beam condition, in 5G NR, a Synchronization signal burst contains at most L Synchronization Signal Blocks (SSB). L is associated with a frequency range. Wherein, in the frequency range below 3GHz, L is 4; l is 8 in the frequency range of 3GHz to 6 GHz; in the frequency range of 6GHz to 52.6GHz, L is 64. Each SSB is formed by 4 Orthogonal Frequency Division Multiplexing (OFDM) symbols, and each SSB includes one PBCH. Thus, in 5G NR, one PBCH TTI may contain 16 × L, 8 × L or 4 × L equal portions of PBCH.
In NR, it is still possible to obtain soft combining gain by soft combining, and improve demodulation performance. However, the number of PBCH copies contained in one PBCH TTI is far more than 4. If the PBCH soft combining mode in LTE is directly followed, a large number of blind detection combinations will be induced, thereby resulting in an increase in the complexity of PBCH demodulation for the user terminal.
Disclosure of Invention
The embodiment of the invention solves the problem of how to reduce the blind detection combination corresponding to PBCH soft combination and reduce the complexity of PBCH demodulation.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for demodulating a physical broadcast channel, including: determining the boundary of a synchronous signal burst set according to the detected synchronous signal block; for each synchronization signal block in the jth synchronization signal burst set, performing PBCH demodulation in the following manner until CRC check is successful, otherwise, iteratively executing to the last synchronization signal block in the jth synchronization signal burst set: carrying out PBCH demodulation on the ith synchronous signal block, and carrying out CRC check on a PBCH demodulation result corresponding to the ith synchronous signal block; when the CRC fails, calculating the input of a PBCH decoder corresponding to the next synchronous signal block, and performing soft combination with the calculated input of the PBCH decoder; and after the soft combination is finished, performing CRC check on the PBCH decoding result corresponding to the obtained soft combination result again, wherein i is more than or equal to 1 and less than or equal to N, and N is the number of the synchronization signal blocks in the jth synchronization signal burst set.
Optionally, the physical broadcast channel demodulation method further includes: when the iterative execution is still failed to the CRC check result of the last synchronous signal block in the synchronous signal burst set, PBCH demodulation is carried out in the following mode until the CRC check is successful, otherwise, the iterative execution is carried out to the last synchronous signal burst set in the current transmission time interval to which the jth synchronous signal burst set belongs: and calculating the input of a PBCH decoder corresponding to the next synchronous signal burst set, performing soft combination on the input of the PBCH decoder corresponding to the calculated synchronous signal burst set, and performing CRC (cyclic redundancy check) on the PBCH decoding result corresponding to the obtained soft combination result again.
Optionally, for the jth synchronization signal burst set, the soft combining the PBCH channel decoder inputs corresponding to the calculated synchronization signal burst set includes: acquiring the period of a synchronous signal burst set by the current transmission time interval; determining a synchronous signal burst set which is in soft combination with the jth synchronous signal burst set according to the cycle of the synchronous signal burst set; and when the PBCH decoder input corresponding to the determined synchronization signal burst set is calculated, performing soft combining on the PBCH decoder input corresponding to the jth synchronization signal burst set and the PBCH decoder input corresponding to the determined synchronization signal burst set.
Optionally, the determining a synchronization signal burst set soft-combined with the jth synchronization signal burst set includes: when the cycle of the synchronization signal burst set by the current transmission time interval is 5ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: all sets of synchronization signal bursts within the current transmission time interval; when the cycle of the synchronization signal burst set by the current transmission time interval is 10ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: a synchronization signal burst set separated in time domain from the jth synchronization signal burst set by 1 synchronization signal burst set; when the cycle of the synchronization signal burst set by the current transmission time interval is 20ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: a set of synchronization signal bursts separated in time domain from the jth set of synchronization signal bursts by 3 sets of synchronization signal bursts.
Optionally, the physical broadcast channel demodulation method further includes: and when the CRC result of the last synchronous signal burst set in the current transmission time interval still fails after the iteration, the synchronous signal block is detected again in the next transmission time interval.
Optionally, the determining the boundary of the burst set of synchronization signals includes: and determining the boundary of the burst set of the synchronous signals according to the subcarrier interval.
Optionally, the determining the boundary of the burst set of the synchronization signal according to the subcarrier interval includes: the subcarrier interval is 15KHz or 30 KHz; when the timing deviation of adjacent synchronous signal blocks is not less than 5ms, judging that the adjacent synchronous signal blocks belong to different synchronous signal burst sets, wherein the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 3 bits of synchronous signal block time index information, if the time index of a previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; if the time index of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than the time index of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a front synchronous signal block in the adjacent synchronous signal blocks is greater than that of a rear synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
Optionally, the determining the boundary of the burst set of the synchronization signal according to the subcarrier interval includes: the subcarrier interval is 120 KHz; when the timing deviation of adjacent synchronous signal blocks is not less than 5ms, judging that the adjacent synchronous signal blocks belong to different synchronous signal burst sets, wherein the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 2 or 3 bits of synchronous signal block time index information, if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of the next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
Optionally, the determining the boundary of the burst set of the synchronization signal according to the subcarrier interval includes: the subcarrier interval is 240 KHz; when the timing deviation of adjacent synchronous signal blocks is not less than 5ms, judging that the adjacent synchronous signal blocks belong to different synchronous signal burst sets, wherein the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; when the timing deviation of the adjacent synchronous signal blocks is not more than 2.5ms, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms and more than 2.5ms, and the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a previous synchronous signal block in the adjacent synchronous signal blocks is more than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of each synchronous signal burst set is located between the corresponding time domain positions of the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
Optionally, the performing PBCH demodulation on the ith synchronization signal block includes: demodulating the OFDM symbol occupied by the PBCH channel in the ith synchronizing signal block, and executing PBCH symbol domain processing, descrambling and de-rate matching; inputting the de-rate matched data to the PBCH decoder.
An embodiment of the present invention further provides a physical broadcast channel demodulation apparatus, including: a detection unit for detecting a synchronization signal block; a boundary determining unit, configured to determine a boundary of a burst set of synchronization signals according to the detected synchronization signal block; an iterative demodulation unit, configured to perform PBCH demodulation on each synchronization signal block in the jth synchronization signal burst set by using the following steps until CRC check is successful, otherwise, perform iteration until the last synchronization signal block in the jth synchronization signal burst set: carrying out PBCH demodulation on the ith synchronous signal block, and carrying out CRC check on a PBCH demodulation result corresponding to the ith synchronous signal block; when the CRC fails, calculating the input of a PBCH decoder corresponding to the next synchronous signal block, and performing soft combination with the calculated input of the PBCH decoder; and after the soft combination is finished, performing CRC check on the PBCH decoding result corresponding to the obtained soft combination result again, wherein i is more than or equal to 1 and less than or equal to N, and N is the number of the synchronization signal blocks in the jth synchronization signal burst set.
Optionally, the iterative demodulation unit is further configured to, when the CRC check result of the last synchronization signal block in the synchronization signal burst set performed iteratively still fails, perform PBCH demodulation in the following manner until the CRC check succeeds, otherwise, perform iteratively to the last synchronization signal burst set in the current transmission time interval to which the jth synchronization signal burst set belongs: and calculating the input of a PBCH decoder corresponding to the next synchronous signal burst set, performing soft combination on the input of the PBCH decoder corresponding to the calculated synchronous signal burst set, and performing CRC (cyclic redundancy check) on the PBCH decoding result corresponding to the obtained soft combination result again.
Optionally, the demodulation iteration unit is configured to obtain a cycle of a synchronization signal burst set in the current transmission time interval; determining a synchronous signal burst set which is in soft combination with the jth synchronous signal burst set according to the cycle of the synchronous signal burst set; and when the PBCH decoder input corresponding to the determined synchronization signal burst set is calculated, performing soft combining on the PBCH decoder input corresponding to the jth synchronization signal burst set and the PBCH decoder input corresponding to the determined synchronization signal burst set.
Optionally, when the period of the synchronization signal burst set by the current transmission time interval is 5ms, the synchronization signal burst set soft-combined with the jth synchronization signal burst set is: all sets of synchronization signal bursts within the current transmission time interval; when the cycle of the synchronization signal burst set by the current transmission time interval is 10ms, the synchronization signal burst set soft-combined with the jth synchronization signal burst set is: a synchronization signal burst set separated in time domain from the jth synchronization signal burst set by 1 synchronization signal burst set; when the cycle of the synchronization signal burst set by the current transmission time interval is 20ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: a set of synchronization signal bursts separated in time domain from the jth set of synchronization signal bursts by 3 sets of synchronization signal bursts.
Optionally, the detecting unit is further configured to detect a synchronization signal block again in a next transmission time interval when the CRC check result of the last synchronization signal burst set in the current transmission time interval still fails after the iteration is performed.
Optionally, the boundary determining unit is configured to determine a boundary of the synchronization signal burst set according to a subcarrier interval.
Optionally, when the subcarrier interval is 15KHz or 30KHz, the boundary determining unit is configured to determine that adjacent synchronization signal blocks belong to different synchronization signal burst sets when the timing deviation of the adjacent synchronization signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronization signal burst sets is located between time domain positions corresponding to the adjacent synchronization signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 3 bits of synchronous signal block time index information, if the time index of a previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; if the time index of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than the time index of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a front synchronous signal block in the adjacent synchronous signal blocks is greater than that of a rear synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
Optionally, when the subcarrier interval is 120KHz, the boundary determining unit is configured to determine that adjacent synchronization signal blocks belong to different synchronization signal burst sets when the timing deviation of the adjacent synchronization signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronization signal burst set is located between time domain positions corresponding to the adjacent synchronization signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 2 or 3 bits of synchronous signal block time index information, if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of the next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
Optionally, when the subcarrier interval is 240KHz, the boundary determining unit is configured to determine that adjacent synchronization signal blocks belong to different synchronization signal burst sets when the timing deviation of the adjacent synchronization signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronization signal burst set is located between time domain positions corresponding to the adjacent synchronization signal blocks; when the timing deviation of the adjacent synchronous signal blocks is not more than 2.5ms, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms and more than 2.5ms, and the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a previous synchronous signal block in the adjacent synchronous signal blocks is more than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of each synchronous signal burst set is located between the corresponding time domain positions of the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
Optionally, the iterative demodulation unit is configured to demodulate an OFDM symbol occupied by a PBCH channel in the ith synchronization signal block, and perform PBCH symbol domain processing, descrambling, and de-rate matching; inputting the de-rate matched data to the PBCH decoder.
The embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method performs any of the steps of the physical broadcast channel demodulation method.
The embodiment of the invention also provides a user terminal, which comprises a memory and a processor, wherein the memory is stored with computer instructions, and the computer instructions execute any step of the physical broadcast channel demodulation method when running.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the boundary of the synchronous signal burst set is determined according to the detected synchronous signal blocks, and the synchronous signal blocks in the same synchronous signal burst set are configured with the same parameters, so that the input of a PBCH (physical broadcast channel) decoder of the synchronous signal blocks in the same synchronous signal burst set can be directly subjected to soft combining without blind detection operation, the blind detection combination corresponding to the PBCH soft combining can be effectively reduced, and the complexity of PBCH demodulation is reduced.
Further, a synchronization signal burst set soft-combined with the jth synchronization signal burst set is determined according to the period of the synchronization signal burst set. When the PBCH channel decoder input corresponding to the determined synchronization signal burst set has been calculated, it is soft combined with the PBCH channel decoder input corresponding to the jth synchronization signal burst set. Since the soft combining is performed between the synchronization signal burst sets, the blind detection combination performed is a blind detection combination between the synchronization signal burst sets, not a blind detection combination between the synchronization signal blocks. Because the number of the synchronous signal burst sets is less than that of the synchronous signal blocks, the blind detection combination number is greatly reduced, and the complexity of PBCH demodulation can be further reduced.
Drawings
Fig. 1 is a flowchart of a physical broadcast channel demodulation method in an embodiment of the present invention;
fig. 2 is a flowchart of another physical broadcast channel demodulation method in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a physical broadcast channel demodulation apparatus in an embodiment of the present invention.
Detailed Description
In LTE systems, a single received PBCH can be directly demodulated. If the currently received PBCH demodulation is successful, namely the CRC check is passed, the PBCH demodulation is ended. And if the currently received PBCH fails to demodulate, executing next receiving and trying to perform soft combining with the currently received PBCH. Since the two received PBCHs may belong to different TTIs and cannot be combined, two blind detection combinations need to be tried, i.e., one combining attempt and one non-combining attempt are performed on the two received PBCH attempts.
For example, the currently received PBCH is PBCH 1. If PBCH1 fails to demodulate, the reception is continued
PBCH 2. After receiving PBCH2, since PBCH1 and PBCH2 may belong to different TTIs, two blind detection combinations, i.e., combining PBCH1 and PBCH2 and demodulating PBCH2 separately, need to be attempted.
If the two received PBCH are still not successfully demodulated, the soft combining of the third received PBCH is continued. If the combining of PBCH1 and PBCH2 and the individual demodulation of PBCH still fail, PBCH3 is received and combined with PBCH1 and PBCH2, and the obtained blind detection combination includes: PBCH1 and PBCH3, PBCH2 and PBCH3, PBCH1 and PBCH2, PBCH3, PBCH3, four combinations in total.
If the PBCH received three times still fails to be demodulated successfully, that is, the PBCH demodulation corresponding to the above four combination cases still fails, the soft combining of the PBCH received the fourth time is continuously performed. Receiving PBCH4 and combining with PBCH1, PBCH2 and PBCH3, the resulting combination comprising: PBCH1 and PBCH4, PBCH2 and PBCH4, PBCH3 and PBCH4, PBCH1 and PBCH2 and PBCH4, PBCH2 and PBCH3 and PBCH4, PBCH1 and PBCH3 and PBCH4, PBCH1 and PBCH2 and PBCH3, PBCH4 and PBCH4, for eight blind detection combinations.
Therefore, in the LTE system, a maximum of 15 soft combining operations may be performed within one TTI, that is, a maximum of 15 blind detection combinations exist.
Similar to the LTE system, in the 5G NR, it is still possible to obtain a soft combining gain in a soft combining manner, thereby improving demodulation performance. However, in 5G NR, one PBCH TTI may contain equal portions of PBCH of 16 × L, 8 × L, or 4 × L, and compared to the LTE system, the number of PBCH copies contained in one PBCH TTI in 5G NR is far more than 4. If the PBCH soft combining mode in LTE is directly followed, a large number of blind detection combinations will be induced, thereby resulting in an increase in the complexity of PBCH demodulation for the user terminal.
In the embodiment of the invention, the synchronous signal blocks in the same synchronous signal burst set can be directly subjected to soft combination without blind detection operation, so that the blind detection combination corresponding to PBCH soft combination can be effectively reduced, and the complexity of PBCH demodulation is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
An embodiment of the present invention provides a method for demodulating a physical broadcast channel, which is described in detail below with reference to fig. 1 through specific steps.
Step S101, according to the detected synchronous signal block, determining the boundary of the synchronous signal burst set.
In a specific implementation, a set of Synchronization Signal blocks may be detected through Primary Synchronization Signal (PSS) detection and Secondary Synchronization Signal (SSS) detection before PBCH demodulation.
After acquisition of the detected set of synchronization signal blocks, the boundaries of the set of synchronization signal bursts may be determined. In practical applications, a set of synchronization signal bursts may comprise a synchronization signal block or a plurality of synchronization signal blocks. In a synchronization signal burst set, the parameters configured by the base station for the synchronization signal blocks therein are the same.
In particular implementations, the boundaries of the burst sets of synchronization signals may be determined based on subcarrier spacing. In practical applications, the subcarrier spacing may include four kinds, i.e., 15KHz, 30KHz, 120KHz, and 240 KHz. The following describes the determination of the boundaries of the synchronization signal burst sets corresponding to the above four subcarrier intervals in detail.
The same approach can be used to determine the boundary of the burst set of synchronization signals when the subcarrier spacing is 15KHz or 30 KHz.
First, it is detected whether the timing deviation of two adjacent sync signal blocks is greater than or equal to 5 ms. In practical applications, after detecting the synchronization signal blocks, the user terminal may obtain timing information corresponding to each synchronization signal block. And acquiring the timing deviation corresponding to two adjacent synchronous signal blocks according to the timing information corresponding to each synchronous signal block.
When the timing deviation of two adjacent synchronous signal blocks is greater than or equal to 5ms, it can be determined that the two synchronous signal blocks belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the two adjacent synchronous signal blocks.
For example, if the timing deviation between the synchronization signal block1 and the synchronization signal block2 is 7ms, it can be determined that the synchronization signal block1 and the synchronization signal block2 belong to different synchronization signal burst sets, and the time domain position of the boundary of the synchronization signal burst set is located between the time domain positions corresponding to the synchronization signal block1 and the synchronization signal block 2.
When the timing deviation of two adjacent synchronization Signal blocks is less than 5ms, if a PBCH Demodulation Reference Signal (DMRS) carries 3 bits of synchronization Signal block time index information, according to the synchronization Signal block time index detected by the PBCH DMRS, if the time index of the former synchronization Signal block is greater than that of the latter synchronization Signal block, it can be determined that the two adjacent synchronization Signal blocks belong to different synchronization Signal burst sets; if the time index of the previous synchronization signal block is less than or equal to the time index of the next synchronization signal block, it can be determined that the adjacent synchronization signal blocks belong to the same synchronization signal burst set.
When the timing deviation of two adjacent synchronization signal blocks is less than 5ms, if the PBCH DMRS carries two bits of synchronization signal block time index information, the synchronization signal block time index information detected by the PBCH DMRS is converted into a synchronization signal block group number, and the rest 1 bit information represents the index in the synchronization signal block group. If the group number of the former synchronous signal block in the two adjacent synchronous signal blocks is larger than that of the latter synchronous signal block, the two adjacent synchronous signal blocks can be judged to belong to different synchronous signal burst sets; if the group number of the previous synchronization signal block in the two adjacent synchronization signal blocks is less than or equal to the group number of the next synchronization signal block, it can be determined that the two adjacent synchronization signal blocks belong to the same synchronization signal burst set.
In the embodiment of the present invention, when two adjacent synchronization signal blocks belong to different synchronization signal burst sets, the time domain position of the boundary of the synchronization signal burst set is located between the time domain positions corresponding to the two adjacent synchronization signal blocks.
When the subcarrier interval is 120KHz, if it is detected that the timing deviation of adjacent synchronization signal blocks is greater than or equal to 5ms, it can be determined that two adjacent synchronization signal blocks belong to different synchronization signal burst sets.
When the subcarrier interval is 120KHz, if the timing deviation of the adjacent synchronization signal blocks is detected to be less than 5ms, the bit number of the synchronization signal block time index information carried by the PBCH DMRS can be obtained first. When the bit number of the synchronization signal block time index information carried by the PBCH DMRS is 2 bits or 3 bits, the 2 bits or 3 bits carrying the synchronization signal block time index information in the PBCH DMRS may be converted into a synchronization signal block group number, and the remaining 4 bits or 3 bits in the PBCH DMRS represent an index in the synchronization signal block group. If the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is larger than that of the next synchronous signal block, two synchronous signal blocks in the adjacent synchronous signal blocks can be judged to belong to different synchronous signal burst sets; if the group number of the previous synchronization signal block is less than or equal to the group number of the next synchronization signal block, it can be determined that two synchronization signal blocks in the adjacent synchronization signal blocks belong to the same synchronization signal burst set.
When the subcarrier interval is 240KHz, if it is detected that the timing deviation of adjacent synchronization signal blocks is greater than or equal to 5ms, it can be determined that the two adjacent synchronization signal blocks belong to different synchronization signal burst sets. If the timing deviation of two adjacent synchronous signal blocks is detected to be less than or equal to 2.5ms, two adjacent synchronous signal blocks can be judged to belong to the same synchronous signal burst set.
When the subcarrier interval is 240KHz, if it is detected that the timing deviation of adjacent synchronization signal blocks is less than 5ms and greater than 2.5ms, the bit number of the synchronization signal block time index information carried by the PBCH DMRS may be obtained first. When the bit number of the synchronization signal block time index information carried by the PBCH DMRS is 2 bits or 3 bits, the 2 bits or 3 bits carrying the synchronization signal block time index information in the PBCH DMRS may be converted into a synchronization signal block group number, and the remaining 4 bits or 3 bits in the PBCH DMRS represent an index in the synchronization signal block group. If the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is larger than that of the next synchronous signal block, two synchronous signal blocks in the adjacent synchronous signal blocks can be judged to belong to different synchronous signal burst sets; if the group number of the previous synchronization signal block is less than or equal to the group number of the next synchronization signal block, it can be determined that two synchronization signal blocks in the adjacent synchronization signal blocks belong to the same synchronization signal burst set.
Step S102, PBCH demodulation is performed on the ith synchronization signal block.
In a specific implementation, the PBCH demodulation is performed on the ith synchronization signal block, which may be performed on OFDM symbols occupied by a PBCH channel in the ith synchronization signal block, and the method includes the following steps: firstly, PBCH symbol domain processing, descrambling and de-rate matching are carried out on OFDM symbols occupied by PBCH channels in the ith synchronization signal block; then, inputting the de-rate-matched data to the PBCH decoder, where the output of the PBCH decoder is: and carrying out PBCH demodulation on the ith synchronization signal block to obtain a demodulation result.
In the embodiment of the invention, i is more than or equal to 1 and less than or equal to N, and N is the number of the synchronous signal blocks in the jth synchronous signal burst set
Step S103, performing CRC check on the PBCH demodulation result corresponding to the ith synchronization signal block.
In a specific implementation, after obtaining the PBCH demodulation result corresponding to the ith synchronization signal block, CRC check may be performed on the PBCH demodulation result corresponding to the ith synchronization signal block. When the CRC check fails, step S104 may be performed; when the CRC check is successful, step S107 may be performed.
Step S104, calculating the PBCH decoder input corresponding to the next synchronization signal block, and performing soft combining with the calculated PBCH decoder input.
In a specific implementation, when the CRC check performed on the PBCH demodulation result corresponding to the ith synchronization signal block fails, the PBCH channel decoder input corresponding to another synchronization signal block in the jth synchronization signal burst set may be calculated and soft-combined with the calculated PBCH channel decoder input.
In the embodiment of the present invention, the soft combining of the two signals may refer to: the amplitude, phase, etc. of the two signals are directly added.
In a specific implementation, the PBCH decoder input corresponding to the synchronization signal block may refer to: the de-rate matching result corresponding to the OFDM symbol occupied by the PBCH channel in the synchronization signal block, that is, the signal input to the PBCH channel decoder corresponding to the synchronization signal block.
Step S105, performs CRC check again on the PBCH channel decoding result corresponding to the obtained soft combining result.
In an implementation, after obtaining the soft combining result, the soft combining result may be input to the PBCH channel decoder, so as to obtain a PBCH channel decoding result corresponding to the soft combining result. And after obtaining the PBCH decoding result corresponding to the soft combining result, performing CRC check on the PBCH decoding result corresponding to the soft combining result again.
Step S106, judging whether the CRC check is successful.
In a specific implementation, when the CRC check corresponding to the PBCH channel decoding result corresponding to the soft combining result is successful, step S107 is executed; when the CRC check corresponding to the PBCH channel decoding result corresponding to the soft combining result fails, step S104 is executed again.
And (6) iteratively executing the step (S104) to the step (S106) until the CRC check is successful, or until the CRC check result obtained by the last synchronous signal block in the jth synchronous signal burst set is still failure, ending the process.
Step S107 ends PBCH demodulation.
In an implementation, when the CRC check is successful, it can be determined that the PBCH has been successfully demodulated in the current transmission time interval, and thus, the PBCH demodulation can be ended.
The physical broadcast channel demodulation method provided in the above-described embodiment of the present invention is explained below by way of example.
In the current synchronization signal burst set, the synchronization signal burst set comprises four synchronization signal blocks which are sequentially SS Block1, SS Block2, SS Block3 and SS Block4, wherein SS Block1 corresponds to PBCH1, SS Block2 corresponds to PBCH2, SS Block3 corresponds to PBCH3, and SS Block4 corresponds to PBCH 4. PBCH channel decoder input corresponding to PBCH1, PBCH channel decoder input corresponding to PBCH2, PBCH2, PBCH channel decoder input corresponding to PBCH3, PBCH3, and PBCH channel decoder input corresponding to PBCH4 are set to PBCH1 ', PBCH 4', respectively.
Because the four synchronous signal blocks belong to the same synchronous signal burst set, the parameters configured by the four synchronous signal blocks are the same, and the soft combining operation can be directly carried out.
In physical broadcast channel demodulation, PBCH1 is demodulated first. After the demodulation of PBCH1 is completed, CRC check is performed on the demodulation result corresponding to PBCH 1. When the CRC check corresponding to PBCH1 is successful, PBCH demodulation is successful, so PBCH demodulation does not need to be performed in the current TTI, and PBCH demodulation can be ended; and when the CRC result corresponding to the PBCH1 is failure, calculating PBCH2 ' input by a PBCH decoder corresponding to the PBCH2, performing soft combination on the PBCH2 ' input and PBCH1 ', and inputting the obtained soft combination result to the PBCH decoder.
The PBCH channel decoder performs channel decoding on the soft combining results of PBCH1 'and PBCH 2', and performs CRC check on the channel decoded results. When the result obtained by the channel decoding passes the CRC, finishing the PBCH demodulation; and when the result obtained by the current channel decoding fails to pass the CRC check, calculating PBCH3 'input by a PBCH decoder corresponding to the PBCH3, performing soft combining on the PBCH 3' input by the PBCH decoder, the PBCH1 'input by the PBCH decoder and the PBCH 2' input by the PBCH decoder, and inputting the obtained soft combining result to the PBCH decoder.
The PBCH channel decoder channel-decodes the soft combining results of PBCH1 ', PBCH2 ', and PBCH3 ', and CRC-checks the channel-decoded results. When the result obtained by the channel decoding passes the CRC, finishing the PBCH demodulation; and when the result obtained by the current channel decoding fails to pass the CRC check, calculating PBCH4 ' input by the PBCH decoder corresponding to the PBCH4, performing soft combining on the PBCH4 ' input, PBCH1 ', PBCH2 ' and PBCH3 ', and inputting the obtained soft combining result to the PBCH decoder.
The PBCH channel decoder channel-decodes the soft combining results of PBCH1 ', PBCH 2', PBCH3 ', and PBCH 4', and performs CRC check on the channel-decoded results. When the result obtained by the channel decoding passes the CRC, finishing the PBCH demodulation; and when the result obtained by the channel decoding at this time does not pass the CRC check, judging that the PBCH cannot be successfully demodulated from the current synchronization signal burst set.
In the prior art, since PBCHs corresponding to two synchronization signal blocks may belong to different PBCH TTIs, two blind detection combinations need to be tried. When the number of PBCHs included in one PBCH TTI is 4, 15 blind detection combinations may need to be attempted.
In the embodiment of the invention, the boundary of the synchronous signal burst set is determined by the detected synchronous signal blocks, and the input of PBCH (physical broadcast channel) decoders corresponding to different synchronous signal blocks can be directly combined in the same synchronous signal burst set without blind detection operation. Taking an example that one synchronization signal burst set includes 4 PBCHs, in the prior art, blind detection combination in 15 may need to be tried, but the physical broadcast channel demodulation method provided in the embodiment of the present invention does not need to perform blind detection operation, but directly combines inputs of PBCH channel decoders corresponding to synchronization signal blocks in the same synchronization signal burst set, so that blind detection combinations corresponding to PBCH soft combining can be effectively reduced, and complexity of PBCH demodulation is reduced.
In practical applications, when the iteration is performed to the last synchronization signal block in the jth synchronization signal burst set, the CRC check may still fail. That is to say, after the PBCH channel decoder performs the channel decoding operation on the soft combining results input by the PBCH channel decoder corresponding to all the synchronization signal blocks in the jth synchronization signal burst set, the obtained channel decoding results still do not pass the CRC check. When the above result occurs, it can be determined that PBCH cannot be successfully demodulated only from the jth synchronization signal burst set.
In order to successfully demodulate the PBCH in the current TTI as much as possible, in the embodiment of the present invention, referring to fig. 2, a flowchart of another physical broadcast channel demodulation method in the embodiment of the present invention is given.
After the execution of step S106 is completed, step S108 may be executed.
Step S108, judging whether the jth synchronization signal burst set has a synchronization signal block which is not demodulated by PBCH.
When there is a synchronization signal block for which PBCH demodulation is not performed, re-executing step S104; when there is no synchronization signal block for which PBCH demodulation is not performed, step S109 is performed.
Step S109 calculates the PBCH channel decoder input corresponding to the next synchronization signal burst set, and performs soft combining with the PBCH channel decoder input corresponding to the synchronization signal burst set that has been calculated.
In a specific implementation, step S101 is adopted to obtain all burst sets of synchronization signals in the current TTI. And when the PBCH can not be successfully demodulated according to the jth synchronization signal burst set, calculating the input of a PBCH channel decoder corresponding to the next synchronization signal burst set in the current TTI, and performing soft combining with the input of the PBCH channel decoder corresponding to the synchronization signal burst set obtained by calculation.
In a specific implementation, the PBCH channel decoder input corresponding to the next synchronization signal burst set may be the PBCH channel decoder input corresponding to all the synchronization signal blocks in the next synchronization signal burst set, or may be the PBCH channel decoder input corresponding to part of the synchronization signal blocks in the next synchronization signal burst set.
Step S110, performing CRC check on the PBCH channel decoding result of the soft combining result corresponding to the synchronization signal burst set.
In a specific implementation, after the soft combining result corresponding to the synchronization signal burst set is obtained, the soft combining result corresponding to the synchronization signal burst set may be input to the PBCH channel decoder, so as to obtain the PBCH channel decoding result of the soft combining result corresponding to the synchronization signal burst set, and perform CRC check on the obtained channel decoding result.
Step S111, determining whether CRC check is successful.
In a specific implementation, the determining whether the CRC check is successful in this step refers to: and judging whether the CRC check carried out by the PBCH decoding result of the soft combination result corresponding to the synchronous signal burst set is successful. When the CRC check is successful, step S107 is performed; when the CRC check fails, step S109 is re-executed.
That is, when the CRC check is successful, it can be determined that the PBCH has been successfully demodulated in the current TTI, and therefore, the PBCH demodulation operation is not required. When the CRC check fails, it can be determined that the PBCH has not been successfully demodulated in the current TTI, and therefore, the PBCH demodulation operation needs to be continuously performed, and the PBCH demodulation operation is iteratively performed until the last synchronization signal burst set in the current TTI.
In practical applications, after the iteration is performed to the last synchronization signal burst set in the current TTI, there may still be a case where the CRC check fails, and at this time, it may be determined that the PBCH cannot be successfully demodulated according to the current TTI. Therefore, in the next TTI, steps S101 to S111 may be re-executed to continue demodulating PBCH.
In a specific implementation, the synchronization signal burst set soft-combined with the jth synchronization signal burst set may be determined according to a period of the synchronization signal burst set in the current TTI. When the PBCH channel decoder input corresponding to the determined synchronization signal burst set has been calculated, the PBCH channel decoder input corresponding to the jth synchronization signal burst set may be soft combined with the PBCH channel decoder input corresponding to the determined synchronization signal burst set.
That is, in the current TTI, the PBCH channel decoder inputs for the jth synchronization signal burst set may be soft combined with only the PBCH channel decoder inputs corresponding to a portion of the synchronization signal burst sets, without requiring soft combining of the PBCH channel decoder inputs corresponding to all of the synchronization signal burst sets in the current TTI.
In a specific implementation, when the period of the synchronization signal burst set in the current TTI is 5ms, the synchronization signal burst set that can be soft-combined with the jth synchronization signal burst set is: all synchronization signal bursts within the current TTI. When the cycle of the synchronization signal burst set by the current TTI is 10ms, the synchronization signal burst set that can be soft-combined with the jth synchronization signal burst set is: a set of synchronization signal bursts separated in the time domain from the jth set of synchronization signal bursts by 1 set of synchronization signal bursts. When the period of the synchronization signal burst set by the current TTI is 20ms, the synchronization signal burst set that can be soft-combined with the jth synchronization signal burst set is: a set of synchronization signal bursts that is separated in the time domain from the jth set of synchronization signal bursts by 3 sets of synchronization signal bursts.
In the embodiment of the present invention, the soft combining with the jth synchronization signal burst set means: soft combining may be performed with the PBCH channel decoder input for the jth set of synchronization signal bursts.
Next, steps S109 to S111 will be described by way of example.
Set in the current TTI, comprising 8 synchronization signal burst sets, SS burst set1, SS burst set2, SS burst set3, SS burst set4, SS burst set5, SS burst set6, SS burst set7 and SS burst set8 in sequence. It is assumed that each set of synchronization signal bursts includes 4 synchronization signal blocks. In the current TTI, the period of the synchronization signal burst set is set to 5 ms.
When the PBCH in the synchronization signal block in SS burst set1 is demodulated, the PBCH channel decoder performs channel decoding on the soft combining results of PBCH1 ', PBCH 2', PBCH3 'and PBCH 4', and the channel decoding result still fails CRC check, that is, PBCH cannot be successfully demodulated according to SS burst set 1. Therefore, it is necessary to combine other sets of synchronization signal bursts to achieve successful demodulation of PBCH.
When SS burst set2 and SS burst set1 are in the same TTI, SS burst set2 and SS burst set1 can be subjected to soft combining; when SS burst set2 and SS burst set1 are in two TTIs, SS burst set2 and SS burst set1 cannot be soft combined. Since it is not known whether SS burst set2 and SS burst set1 are in the same TTI, blind detection is required, and the combination of blind detection is: SS burst set2 in combination with SS burst set1, and SS burst set 2. In other words, two blind detection operations need to be performed.
The operations of step S101 to step S107 are performed on the synchronization signal block in SS burst set 2. And when the channel decoding results corresponding to the soft combining results input by the PBCH decoders corresponding to the four synchronous signal blocks in the SS burst set2 still fail to pass the CRC check, performing soft combining on the input of the PBCH decoder corresponding to the SS burst set1 and the input of the PBCH decoder corresponding to the SS burst set2 to obtain the soft combining results of the SS burst set1 and the SS burst set 2. The PBCH channel decoder input corresponding to SS burst set1 is: PBCH1 ', PBCH 2', PBCH3 ', and PBCH 4'. The PBCH channel decoder input corresponding to SS burst set2 is: soft combining of PBCH channel decoder inputs for the four sync signal blocks in SS burst set 2.
And the PBCH channel decoder performs channel decoding on the soft combination result of the SS burst set1 and the SS burst set2, and performs CRC (cyclic redundancy check) on the channel decoding result. If the CRC is successfully checked, the result is the PBCH demodulation in the current TTI; if the CRC check fails, the PBCH can not be successfully demodulated according to SS burst set1 and SS burst set 2.
And when the PBCH cannot be successfully demodulated according to SS burst set1 and SS burst set2 and the PBCH cannot be successfully demodulated, carrying out PBCH demodulation on a synchronization signal block in SS burst set 3. Accordingly, since it is not known whether SS burst set1, SS burst set2 and SS burst set3 are in the same TTI, the combinations that need to be blindly detected include four groups: SS burst set3, a combination of SS burst set3 and SS burst set1, a combination of SS burst set3 and SS burst set2, and a combination of SS burst set3, SS burst set2 and SS burst set 1.
Correspondingly, if the PBCH cannot be successfully demodulated by the four groups of blind detection combinations, the PBCH demodulation is performed on the synchronization signal block in SS burst set 4. Accordingly, it is not known whether SS burst set1, SS burst set2 and SS burst set3 are in the same TTI, and therefore the combinations that require blind detection include eight groups: SS burst set4, a combination of SS burst set4 and SS burst set3, a combination of SS burst set4 and SS burst set2, a combination of SS burst set4 and SS burst set1, a combination of SS burst set4 and SS burst set3, SS burst set2, a combination of SS burst set4 and SS burst set1, SS burst set2, a combination of SS burst set4 and SS burst set1, SS burst set3, a combination of SS burst set1, SS burst set2, SS burst set3 and SS burst set 4.
And if the PBCH cannot be successfully demodulated by the eight groups of blind detection combinations, carrying out PBCH demodulation on a synchronization signal block in SS burst set 5. And repeating the steps until the PBCH is successfully demodulated, or until the PBCH demodulation is carried out on the synchronous signal block in the SS burst set8, wherein the CRC check results corresponding to the channel decoding results of various soft combination combinations input by the PBCH channel decoder corresponding to the eight synchronous signal burst sets still fail.
When 8 sets of synchronization signal bursts are included in the current TTI and each set of synchronization signal bursts includes 4 synchronization signal blocks, it means that there are 32 synchronization signal blocks in the current TTI. If the soft combining method in the existing LTE system is adopted, the number of the blind detection combinations is 232-1。
The physical broadcast channel demodulation method provided by the embodiment of the invention adopts soft combination among synchronous signal burst sets, and the number of blind detection combinations is 28-1. Therefore, the physical broadcast channel demodulation method provided by the embodiment of the invention greatly reduces the number of blind detection combinations.
The description of step S109 to step S111 will be continued by way of example.
Set in the current TTI, comprising 8 synchronization signal burst sets, SS burst set1, SS burst set2, SS burst set3, SS burst set4, SS burst set5, SS burst set6, SS burst set7 and SS burst set8 in sequence. It is assumed that each set of synchronization signal bursts includes 4 synchronization signal blocks. In the current TTI, the period of the synchronization signal burst set is set to 20 ms.
When the PBCH in the synchronization signal block in SS burst set1 is demodulated, the PBCH channel decoder performs channel decoding on the soft combining results of PBCH1 ', PBCH 2', PBCH3 'and PBCH 4', and the channel decoding result still fails CRC check, that is, PBCH cannot be successfully demodulated according to SS burst set 1. Therefore, it is necessary to combine other sets of synchronization signal bursts to achieve successful demodulation of PBCH.
Since the period of the burst set of synchronization signals is 20ms in the current TTI, what can be soft combined with the PBCH channel decoder input of SS burst set1 is: PBCH channel decoder input to SS burst set 5. The PBCH decoder inputs corresponding to the other SS burst set 2-SS burst set4, SS burst set 6-SS burst set8 cannot be soft-combined with the PBCH decoder input of SS burst set 1.
The operations of step S101 to step S107 are performed on the synchronization signal block in SS burst set 5. And when the channel decoding results corresponding to the soft combining results input by the PBCH decoders corresponding to the four synchronous signal blocks in the SS burst set5 still fail to pass the CRC check, performing soft combining on the input of the PBCH decoder corresponding to the SS burst set1 and the input of the PBCH decoder corresponding to the SS burst set5 to obtain the soft combining results of the SS burst set1 and the SS burst set 5. The PBCH channel decoder input corresponding to SS burst set1 is: PBCH1 ', PBCH 2', PBCH3 ', and PBCH 4'. The PBCH channel decoder input corresponding to SS burst set5 is: soft combining of PBCH channel decoder inputs for the four sync signal blocks in SS burst set 5.
And the PBCH channel decoder performs channel decoding on the soft combination result of the SS burst set1 and the SS burst set5, and performs CRC (cyclic redundancy check) on the channel decoding result. If the CRC is successfully checked, the result is the PBCH demodulation in the current TTI; if the CRC check fails, the PBCH can not be successfully demodulated according to SS burst set1 and SS burst set 5. And in the next TTI, the PBCH demodulation is carried out again.
It can be seen that when the period of the synchronization signal burst set is 20ms, the number of blind detection combinations is 2, compared to the blind detection combination of 2 in the previous embodiment8-1, further reducing the number of blind detection combinations.
Therefore, the synchronous signal burst set capable of soft combination is determined from all synchronous signal burst sets in the current TTI, and soft combination is carried out on the synchronous signal burst sets and part of synchronous signal burst sets in the current TTI, so that the number of blind detection combinations can be further reduced.
In the embodiment of the present invention, in the same synchronization signal burst set, the soft combining between the synchronization signal blocks refers to: soft combining between PBCH channel decoder inputs corresponding to different synchronization signal blocks; in the same TTI, soft combining of the synchronization signal burst sets means: soft combining between PBCH channel decoder inputs corresponding to different sets of synchronization signal bursts. The input of the PBCH channel decoder corresponding to the synchronous signal burst set is: soft combining of PBCH channel decoder inputs corresponding to all or a portion of the synchronization signal blocks within the set of synchronization signal bursts.
Referring to fig. 3, an embodiment of the present invention further provides a physical broadcast channel demodulation apparatus 30, including: a detection unit 301, a boundary determination unit 302, and an iterative demodulation unit 303, wherein:
a detection unit 301 for detecting a synchronization signal block;
a boundary determining unit 302, configured to determine a boundary of a burst set of synchronization signals according to the detected synchronization signal block;
an iterative demodulation unit 303, configured to perform PBCH demodulation on each synchronization signal block in the jth synchronization signal burst set by using the following steps until CRC check is successful, otherwise, perform iteration until the last synchronization signal block in the jth synchronization signal burst set: carrying out PBCH demodulation on the ith synchronous signal block, and carrying out CRC check on a PBCH demodulation result corresponding to the ith synchronous signal block; when the CRC fails, calculating the input of a PBCH decoder corresponding to the next synchronous signal block, and performing soft combination with the calculated input of the PBCH decoder; and after the soft combination is finished, performing CRC check on the PBCH decoding result corresponding to the obtained soft combination result again, wherein i is more than or equal to 1 and less than or equal to N, and N is the number of the synchronization signal blocks in the jth synchronization signal burst set.
In a specific implementation, the iterative demodulation unit 303 may be further configured to, when the CRC check result of the last synchronization signal block in the synchronization signal burst set performed iteratively still fails, perform PBCH demodulation in the following manner until the CRC check succeeds, otherwise, perform iteratively until the last synchronization signal burst set in the current transmission time interval to which the jth synchronization signal burst set belongs: and calculating the input of a PBCH decoder corresponding to the next synchronous signal burst set, performing soft combination on the input of the PBCH decoder corresponding to the calculated synchronous signal burst set, and performing CRC (cyclic redundancy check) on the PBCH decoding result corresponding to the obtained soft combination result again.
In a specific implementation, the demodulation iteration unit 303 may be configured to obtain a period of a synchronization signal burst set in the current transmission time interval; determining a synchronous signal burst set which is in soft combination with the jth synchronous signal burst set according to the cycle of the synchronous signal burst set; and when the PBCH decoder input corresponding to the determined synchronization signal burst set is calculated, performing soft combining on the PBCH decoder input corresponding to the jth synchronization signal burst set and the PBCH decoder input corresponding to the determined synchronization signal burst set.
In a specific implementation, when the cycle of the synchronization signal burst set by the current transmission time interval is 5ms, the synchronization signal burst set soft-combined with the jth synchronization signal burst set is: all sets of synchronization signal bursts within the current transmission time interval; when the cycle of the synchronization signal burst set by the current transmission time interval is 10ms, the synchronization signal burst set soft-combined with the jth synchronization signal burst set is: a synchronization signal burst set separated in time domain from the jth synchronization signal burst set by 1 synchronization signal burst set; when the cycle of the synchronization signal burst set by the current transmission time interval is 20ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: a set of synchronization signal bursts separated in time domain from the jth set of synchronization signal bursts by 3 sets of synchronization signal bursts.
In a specific implementation, the detecting unit 301 may be further configured to detect a synchronization signal block again in a next transmission time interval when the CRC check result performed iteratively to the last synchronization signal burst set in the current transmission time interval still fails.
In a specific implementation, the boundary determining unit 302 may be configured to determine a boundary of the synchronization signal burst set according to a subcarrier interval.
In a specific implementation, when the subcarrier interval is 15KHz or 30KHz, the boundary determining unit 302 may be configured to determine that adjacent synchronization signal blocks belong to different synchronization signal burst sets when the timing deviation of the adjacent synchronization signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronization signal burst sets is located between time domain positions corresponding to the adjacent synchronization signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 3 bits of synchronous signal block time index information, if the time index of a previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; if the time index of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than the time index of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a front synchronous signal block in the adjacent synchronous signal blocks is greater than that of a rear synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
In a specific implementation, when the subcarrier interval is 120KHz, the boundary determining unit 302 may be configured to determine that adjacent synchronization signal blocks belong to different synchronization signal burst sets when the timing deviation of the adjacent synchronization signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronization signal burst sets is located between time domain positions corresponding to the adjacent synchronization signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 2 or 3 bits of synchronous signal block time index information, if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of the next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
In a specific implementation, when the subcarrier interval is 240KHz, the boundary determining unit 302 may be configured to determine that adjacent synchronization signal blocks belong to different synchronization signal burst sets when the timing deviation of the adjacent synchronization signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronization signal burst sets is located between time domain positions corresponding to the adjacent synchronization signal blocks; when the timing deviation of the adjacent synchronous signal blocks is not more than 2.5ms, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms and more than 2.5ms, and the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a previous synchronous signal block in the adjacent synchronous signal blocks is more than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of each synchronous signal burst set is located between the corresponding time domain positions of the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
In a specific implementation, the iterative demodulation unit 303 may be configured to demodulate an OFDM symbol occupied by a PBCH channel in the ith synchronization signal block, and perform PBCH symbol domain processing, descrambling, and de-rate matching; inputting the de-rate matched data to the PBCH decoder.
The embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of the physical broadcast channel demodulation method according to any of the above embodiments of the present invention are executed.
The embodiment of the present invention further provides a user terminal, which includes a memory and a processor, where the memory stores computer instructions, and the computer instructions execute, when running, the steps of the physical broadcast channel demodulation method according to any of the above embodiments of the present invention.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructing the relevant hardware through a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (22)

1. A method for demodulating a physical broadcast channel, comprising:
determining the boundary of a synchronous signal burst set according to the detected synchronous signal block;
for each synchronization signal block in the jth synchronization signal burst set, performing PBCH demodulation in the following manner until CRC check is successful, otherwise, iteratively executing to the last synchronization signal block in the jth synchronization signal burst set:
carrying out PBCH demodulation on the ith synchronous signal block, and carrying out CRC check on a PBCH demodulation result corresponding to the ith synchronous signal block; when the CRC fails, calculating the input of a PBCH decoder corresponding to the next synchronous signal block, and performing soft combination with the calculated input of the PBCH decoder; and after the soft combination is finished, performing CRC check on the PBCH decoding result corresponding to the obtained soft combination result again, wherein i is more than or equal to 1 and less than or equal to N, and N is the number of the synchronization signal blocks in the jth synchronization signal burst set.
2. The physical broadcast channel demodulation method of claim 1, further comprising: when the iterative execution is still failed to the CRC check result of the last synchronous signal block in the synchronous signal burst set, PBCH demodulation is carried out in the following mode until the CRC check is successful, otherwise, the iterative execution is carried out to the last synchronous signal burst set in the current transmission time interval to which the jth synchronous signal burst set belongs:
and calculating the input of a PBCH decoder corresponding to the next synchronous signal burst set, performing soft combination on the input of the PBCH decoder corresponding to the calculated synchronous signal burst set, and performing CRC (cyclic redundancy check) on the PBCH decoding result corresponding to the obtained soft combination result again.
3. The method of claim 2, wherein for the jth sync signal burst set, the calculating PBCH channel decoder inputs corresponding to a next sync signal burst set and soft combining the PBCH channel decoder inputs corresponding to the calculated sync signal burst set comprises:
acquiring the period of a synchronous signal burst set by the current transmission time interval;
determining a synchronous signal burst set which is in soft combination with the jth synchronous signal burst set according to the cycle of the synchronous signal burst set;
and when the PBCH decoder input corresponding to the determined synchronization signal burst set is calculated, performing soft combining on the PBCH decoder input corresponding to the jth synchronization signal burst set and the PBCH decoder input corresponding to the determined synchronization signal burst set.
4. The physical broadcast channel demodulation method of claim 3 wherein said determining the set of synchronization signal bursts soft combined with the jth set of synchronization signal bursts comprises:
when the cycle of the synchronization signal burst set by the current transmission time interval is 5ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: all sets of synchronization signal bursts within the current transmission time interval;
when the cycle of the synchronization signal burst set by the current transmission time interval is 10ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: a synchronization signal burst set separated in time domain from the jth synchronization signal burst set by 1 synchronization signal burst set;
when the cycle of the synchronization signal burst set by the current transmission time interval is 20ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: a set of synchronization signal bursts separated in time domain from the jth set of synchronization signal bursts by 3 sets of synchronization signal bursts.
5. The physical broadcast channel demodulation method of claim 2, further comprising: and when the CRC result of the last synchronous signal burst set in the current transmission time interval still fails after the iteration, the synchronous signal block is detected again in the next transmission time interval.
6. The method of physical broadcast channel demodulation in accordance with claim 1 wherein said determining the boundary of a set of synchronization signal bursts comprises:
and determining the boundary of the burst set of the synchronous signals according to the subcarrier interval.
7. The physical broadcast channel demodulation method of claim 6 wherein said determining the boundary of said set of synchronization signal bursts based on subcarrier spacing comprises:
the subcarrier interval is 15KHz or 30 KHz;
when the timing deviation of adjacent synchronous signal blocks is not less than 5ms, judging that the adjacent synchronous signal blocks belong to different synchronous signal burst sets, wherein the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks;
when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 3 bits of synchronous signal block time index information, if the time index of a previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; if the time index of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than the time index of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set;
when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a front synchronous signal block in the adjacent synchronous signal blocks is greater than that of a rear synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
8. The physical broadcast channel demodulation method of claim 6 wherein said determining the boundary of said set of synchronization signal bursts based on subcarrier spacing comprises:
the subcarrier interval is 120 KHz;
when the timing deviation of adjacent synchronous signal blocks is not less than 5ms, judging that the adjacent synchronous signal blocks belong to different synchronous signal burst sets, wherein the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks;
when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 2 or 3 bits of synchronous signal block time index information, if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of the next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
9. The physical broadcast channel demodulation method of claim 6 wherein said determining the boundary of said set of synchronization signal bursts based on subcarrier spacing comprises:
the subcarrier interval is 240 KHz;
when the timing deviation of adjacent synchronous signal blocks is not less than 5ms, judging that the adjacent synchronous signal blocks belong to different synchronous signal burst sets, wherein the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks;
when the timing deviation of the adjacent synchronous signal blocks is not more than 2.5ms, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set;
when the timing deviation of the adjacent synchronous signal blocks is less than 5ms and more than 2.5ms, and the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a previous synchronous signal block in the adjacent synchronous signal blocks is more than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of each synchronous signal burst set is located between the corresponding time domain positions of the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
10. The method for demodulating physical broadcast channel of claim 1, wherein the performing PBCH demodulation on the ith synchronization signal block comprises:
demodulating the OFDM symbol occupied by the PBCH channel in the ith synchronizing signal block, and executing PBCH symbol domain processing, descrambling and de-rate matching; inputting the de-rate matched data to the PBCH decoder.
11. A physical broadcast channel demodulation apparatus, comprising:
a detection unit for detecting a synchronization signal block;
a boundary determining unit, configured to determine a boundary of a burst set of synchronization signals according to the detected synchronization signal block;
an iterative demodulation unit, configured to perform PBCH demodulation on each synchronization signal block in the jth synchronization signal burst set by using the following steps until CRC check is successful, otherwise, perform iteration until the last synchronization signal block in the jth synchronization signal burst set: carrying out PBCH demodulation on the ith synchronous signal block, and carrying out CRC check on a PBCH demodulation result corresponding to the ith synchronous signal block; when the CRC fails, calculating the input of a PBCH decoder corresponding to the next synchronous signal block, and performing soft combination with the calculated input of the PBCH decoder; and after the soft combination is finished, performing CRC check on the PBCH decoding result corresponding to the obtained soft combination result again, wherein i is more than or equal to 1 and less than or equal to N, and N is the number of the synchronization signal blocks in the jth synchronization signal burst set.
12. The physical broadcast channel demodulation apparatus of claim 11, wherein the iterative demodulation unit is further configured to, when the CRC check result of the last synchronization signal block in the synchronization signal burst set performed iteratively still fails, perform PBCH demodulation until the CRC check succeeds, otherwise, perform iteratively until the last synchronization signal burst set in the current transmission time interval to which the jth synchronization signal burst set belongs: and calculating the input of a PBCH decoder corresponding to the next synchronous signal burst set, performing soft combination on the input of the PBCH decoder corresponding to the calculated synchronous signal burst set, and performing CRC (cyclic redundancy check) on the PBCH decoding result corresponding to the obtained soft combination result again.
13. The physical broadcast channel demodulation apparatus of claim 12, wherein the iterative demodulation unit is configured to obtain a period of the synchronization signal burst set by the current transmission time interval; determining a synchronous signal burst set which is in soft combination with the jth synchronous signal burst set according to the cycle of the synchronous signal burst set; and when the PBCH decoder input corresponding to the determined synchronization signal burst set is calculated, performing soft combining on the PBCH decoder input corresponding to the jth synchronization signal burst set and the PBCH decoder input corresponding to the determined synchronization signal burst set.
14. The physical broadcast channel demodulation apparatus according to claim 13, wherein when the period of the synchronization signal burst set by the current transmission time interval is 5ms, the synchronization signal burst set soft-combined with the jth synchronization signal burst set is: all sets of synchronization signal bursts within the current transmission time interval; when the cycle of the synchronization signal burst set by the current transmission time interval is 10ms, the synchronization signal burst set soft-combined with the jth synchronization signal burst set is: a synchronization signal burst set separated in time domain from the jth synchronization signal burst set by 1 synchronization signal burst set; when the cycle of the synchronization signal burst set by the current transmission time interval is 20ms, determining the synchronization signal burst set soft-combined with the jth synchronization signal burst set as: a set of synchronization signal bursts separated in time domain from the jth set of synchronization signal bursts by 3 sets of synchronization signal bursts.
15. The physical broadcast channel demodulation apparatus of claim 12 wherein the detection unit is further configured to re-detect a synchronization signal block in a next transmission time interval when the CRC check result iteratively performed to the last synchronization signal burst set in the current transmission time interval still fails.
16. The physical broadcast channel demodulation apparatus of claim 11 wherein the boundary determination unit is configured to determine the boundary of the set of synchronization signal bursts based on subcarrier spacing.
17. The physical broadcast channel demodulating apparatus according to claim 16, wherein when the subcarrier interval is 15KHz or 30KHz, the boundary determining unit is configured to determine that adjacent synchronous signal blocks belong to different synchronous signal burst sets when a timing deviation of the adjacent synchronous signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronous signal burst sets is located between time domain positions corresponding to the adjacent synchronous signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 3 bits of synchronous signal block time index information, if the time index of a previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; if the time index of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than the time index of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a front synchronous signal block in the adjacent synchronous signal blocks is greater than that of a rear synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is located between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
18. The physical broadcast channel demodulation apparatus according to claim 16, wherein when the subcarrier spacing is 120KHz, said boundary determination unit is configured to determine that adjacent synchronization signal blocks belong to different synchronization signal burst sets when timing deviation of the adjacent synchronization signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronization signal burst sets is located between time domain positions corresponding to the adjacent synchronization signal blocks; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms, and the PBCH DMRS carries 2 or 3 bits of synchronous signal block time index information, if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is greater than that of the next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of the synchronous signal burst sets is positioned between the time domain positions corresponding to the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
19. The physical broadcast channel demodulating apparatus according to claim 16, wherein when the subcarrier interval is 240KHz, the boundary determining unit is configured to determine that adjacent synchronous signal blocks belong to different synchronous signal burst sets when timing deviation of the adjacent synchronous signal blocks is not less than 5ms, and a time domain position of a boundary of the synchronous signal burst sets is located between time domain positions corresponding to the adjacent synchronous signal blocks; when the timing deviation of the adjacent synchronous signal blocks is not more than 2.5ms, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set; when the timing deviation of the adjacent synchronous signal blocks is less than 5ms and more than 2.5ms, and the PBCH DMRS carries 2 bits of synchronous signal block time index information, if the group number of a previous synchronous signal block in the adjacent synchronous signal blocks is more than that of a next synchronous signal block, the adjacent synchronous signal blocks are judged to belong to different synchronous signal burst sets, and the time domain position of the boundary of each synchronous signal burst set is located between the corresponding time domain positions of the adjacent synchronous signal blocks; and if the group number of the previous synchronous signal block in the adjacent synchronous signal blocks is not larger than that of the next synchronous signal block, judging that the adjacent synchronous signal blocks belong to the same synchronous signal burst set.
20. The physical broadcast channel demodulation apparatus of claim 11, wherein the iterative demodulation unit is configured to demodulate the OFDM symbols occupied by the PBCH channel in the ith synchronization signal block, and perform PBCH symbol domain processing, descrambling, and de-rate matching; inputting the de-rate matched data to the PBCH decoder.
21. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, performs the steps of the physical broadcast channel demodulation method according to any one of claims 1 to 10.
22. A user terminal comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the computer program when executed performs the steps of the physical broadcast channel demodulation method according to any of claims 1 to 10.
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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110768752B (en) * 2019-10-30 2022-01-28 紫光展锐(重庆)科技有限公司 Communication mode determination method and device
CN112788731B (en) * 2019-11-08 2022-07-08 大唐移动通信设备有限公司 Information sending and receiving method, device and terminal
CN111245562B (en) * 2019-12-27 2022-09-02 重庆物奇科技有限公司 Narrowband broadcasting channel enhancement and combination method for narrowband Internet of things NB-IoT
CN111614441B (en) * 2020-05-22 2023-04-11 Oppo广东移动通信有限公司 Decoding method, device, equipment and storage medium
CN114095118B (en) * 2020-08-25 2024-05-28 深圳市中兴微电子技术有限公司 Blind detection method, device, terminal and storage medium
CN111934826B (en) * 2020-10-12 2020-12-25 翱捷科技股份有限公司 Method and system for receiving PBCH (physical broadcast channel) through LTE (Long term evolution) or LTE-M (Long term evolution-M) cross-period combination
CN115173994B (en) * 2022-06-29 2023-09-08 哲库科技(北京)有限公司 PBCH receiving method, device, equipment and storage medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102271023A (en) * 2010-09-30 2011-12-07 重庆重邮信科通信技术有限公司 Method and device for detecting system frame number of long term evolution (LTE) system
CN103391264A (en) * 2012-05-08 2013-11-13 电信科学技术研究院 Method and device for identifying carrier wave type
CN104753641A (en) * 2015-03-23 2015-07-01 重庆邮电大学 Rapid analyzing method of PBCH (physical broadcast channel) signal channel of LTE (long term evolution) system and rapid analyzing system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110255631A1 (en) * 2010-04-20 2011-10-20 Samsung Electronics Co., Ltd. Methods and apparatus for fast synchronization using tail biting convolutional codes
JP2015536097A (en) * 2012-09-26 2015-12-17 インターデイジタル パテント ホールディングス インコーポレイテッド Method, system and apparatus for operation in a long term evolution (LTE) system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102271023A (en) * 2010-09-30 2011-12-07 重庆重邮信科通信技术有限公司 Method and device for detecting system frame number of long term evolution (LTE) system
CN103391264A (en) * 2012-05-08 2013-11-13 电信科学技术研究院 Method and device for identifying carrier wave type
CN104753641A (en) * 2015-03-23 2015-07-01 重庆邮电大学 Rapid analyzing method of PBCH (physical broadcast channel) signal channel of LTE (long term evolution) system and rapid analyzing system

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
"LTE-A系统中上下行物理层接收机设计与FPGA实现";赵北平;《中国优秀硕士学位论文全文数据库（电子期刊）信息科技辑》;20170331;全文 *
"NR-PBCH design";Fujitsu;《3GPP TSG RAN WG1 Meeting #89 R1-1707253》;20170419;全文 *
"On NR Physical Broadcast Channel";InterDigital Inc;《3GPP TSG RAN WG1 NR AH#2 R1-1710916》;20170630;全文 *
"Realization of receiver architectures using VLSI DSP techniques for broadcast channel in LTE";S. Syed Ameer Abbas; S. J. Thiruvengadam; N. Arun Ram Kumar;《2014 International Conference on Embedded Systems (ICES)》;20141113;全文 *

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