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US-12621101-B2 - Method for transmitting synchronization/physical broadcast channel block and apparatus

US12621101B2US 12621101 B2US12621101 B2US 12621101B2US-12621101-B2

Abstract

This application provides a method for transmitting an SS/PBCH block and an apparatus. The method includes: A terminal device receives one SS/PBCH block in an SS/PBCH block burst set, and then obtains indication information based on the one SS/PBCH block. The indication information may be used to indicate candidate indexes of at least one SS/PBCH block in the SS/PBCH block burst set, and a quantity of the candidate indexes is greater than 64. For example, the quantity of candidate indexes may be 128, 160, 180, 196, 240, or the like. A network device may not be limited to 64 candidate indexes. In other words, a quantity of candidate positions used to send the SS/PBCH block is not limited to 64. Therefore, the network device may send a larger quantity of SS/PBCH blocks to the terminal device.

Inventors

  • Liang Qiao
  • Jiayin Zhang
  • Weiwei Fan

Assignees

  • HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date
20260505
Application Date
20221013
Priority Date
20200414

Claims (12)

  1. 1 . A method for transmitting a synchronization/physical broadcast channel block (SS/PBCH block), wherein the method comprises: receiving, by a terminal device, one SS/PBCH block; obtaining, by the terminal device, indication information based on the one SS/PBCH block, wherein the indication information is useable to indicate candidate indexes of at least one SS/PBCH block in an SS/PBCH block burst set, a quantity of the candidate indexes is greater than 64, and the one SS/PBCH block is located in the SS/PBCH block burst set; and receiving, by the terminal device, configuration information, wherein the configuration information comprises a length of a discovery burst transmission window, the length of the discovery burst transmission window is greater than 5 ms, and the discovery burst transmission window is useable by the terminal device to receive a plurality of SS/PBCH block burst sets; wherein at least two SS/PBCH block bursts of the plurality of SS/PBCH block burst sets occupy different corresponding slots, and corresponding positions of the at least two SS/PBCH block burst sets of the plurality of SS/PBCH block burst sets are the same; at least two SS/PBCH block bursts of the plurality of SS/PBCH block burst sets occupy different corresponding slots, and corresponding positions of the at least two SS/PBCH block burst sets of the plurality of SS/PBCH block burst sets are different; or at least two SS/PBCH block bursts of the plurality of SS/PBCH block burst sets comprise different corresponding quantities of SS/PBCH blocks.
  2. 2 . The method according to claim 1 , wherein the indication information comprises information useable to indicate a demodulation reference signal (DMRS) sequence and information about PBCH payload, wherein the DMRS sequence occupies 3 bits, and the PBCH payload occupies 4 bits.
  3. 3 . The method according to claim 1 , wherein the quantity of the candidate indexes is greater than or equal to 128.
  4. 4 . The method according to claim 1 , wherein the SS/PBCH block burst set received by the terminal device from a network device is determined by the network device based on a listen before talk (LBT) result in response to the at least two of the plurality of SS/PBCH block burst sets occupying different corresponding slots, and the corresponding positions of SS/PBCH blocks in the at least two SS/PBCH block burst sets are the same.
  5. 5 . The method according to claim 1 , wherein the configuration information further comprises a discovery burst transmission window period, and the discovery burst transmission window period is different from an SS/PBCH block burst set periodicity.
  6. 6 . The method according to claim 1 , wherein one of: a time-domain position occupied by the one SS/PBCH block in the SS/PBCH block burst set satisfies at least one of: a start symbol of the one SS/PBCH block in the SS/PBCH block burst set is an even symbol between a first symbol and an eleventh symbol in one slot configured by the network device; or start symbols of two corresponding SS/PBCH blocks in the SS/PBCH block burst set that are adjacent to each other, are spaced by one or more of a third symbol, a fifth symbol or a ninth symbol; or the one SS/PBCH block and a physical downlink shared channel (PDSCH) associated with the one SS/PBCH block satisfies at least one of: the PDSCH has a symbol length equal to 1 or 3; or a start symbol of the PDSCH is a second symbol of four symbols occupied by the one SS/PBCH block or a fourth symbol of four symbols occupied by the one SS/PBCH block.
  7. 7 . A communication apparatus, comprising: a processor; and a non-transitory memory coupled to the processor, the non-transitory memory configured to store non-transitory instructions, the processor being configured to execute the non-transitory instructions, to thereby cause the communication apparatus to: receive one synchronization/physical broadcast channel block (SS/PBCH) block; obtain indication information based on the one SS/PBCH block, wherein the indication information is useable to indicate candidate indexes of at least one SS/PBCH block in an SS/PBCH block burst set, a quantity of the candidate indexes is greater than 64, and the one SS/PBCH block is located in the SS/PBCH block burst set; and receive configuration information, wherein the configuration information comprises a length of a discovery burst transmission window, the length of the discovery burst transmission window is greater than 5 ms, and the discovery burst transmission window is useable by the terminal device to receive a plurality of SS/PBCH block burst sets; wherein at least two SS/PBCH block bursts of the plurality of SS/PBCH block burst sets occupy different corresponding slots, and corresponding positions of the at least two SS/PBCH block burst sets of the plurality of SS/PBCH block burst sets are the same; at least two SS/PBCH block bursts of the plurality of SS/PBCH block burst sets occupy different corresponding slots, and corresponding positions of the at least two SS/PBCH block burst sets of the plurality of SS/PBCH block burst sets are different; or at least two SS/PBCH block bursts of the plurality of SS/PBCH block burst sets comprise different corresponding quantities of SS/PBCH blocks.
  8. 8 . The communication apparatus according to claim 7 , wherein the indication information comprises information useable to indicate a demodulation reference signal (DMRS) sequence and information about PBCH payload, wherein the DMRS sequence occupies 3 bits, and the PBCH payload occupies 4 bits.
  9. 9 . The communication apparatus according to claim 7 , wherein the quantity of the candidate indexes is greater than or equal to 128.
  10. 10 . The communication apparatus according to claim 7 , wherein the SS/PBCH block burst set received by the terminal device from a network device is determined by the network device based on a listen before talk (LBT) result in response to the at least two of the plurality of SS/PBCH block burst sets occupying different corresponding slots, and the corresponding positions of SS/PBCH blocks in the at least two SS/PBCH block burst sets are the same.
  11. 11 . The communication apparatus according to claim 7 , wherein the configuration information further comprises a discovery burst transmission window period, and the discovery burst transmission window period is different from an SS/PBCH block burst set periodicity.
  12. 12 . The communication apparatus according to claim 7 , wherein one of: a time-domain position occupied by the one SS/PBCH block in the SS/PBCH block burst set satisfies at least one of: a start symbol of the one SS/PBCH block in the SS/PBCH block burst set is an even symbol between a first symbol and an eleventh symbol in one slot configured by the network device; or start symbols of two corresponding SS/PBCH blocks in the SS/PBCH block burst set that are adjacent to each other, are spaced by one or more of a third symbol, a fifth symbol or a ninth symbol; or the one SS/PBCH block and a physical downlink shared channel (PDSCH) associated with the one SS/PBCH block satisfies at least one of: the PDSCH has a symbol length equal to 1 or 3; or a start symbol of the PDSCH is a second symbol of four symbols occupied by the one SS/PBCH block or a fourth symbol of four symbols occupied by the one SS/PBCH block.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/087274, filed on Apr. 14, 2021, which claims priority to Chinese Patent Application No. 202110169543.6, filed on Feb. 7, 2021 and Chinese Patent Application No. 202011106045.9, filed on Oct. 15, 2020, and Chinese Patent Application No. 202010292119.6, filed on Apr. 14, 2020. All of the aforementioned patent applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD This application relates to the field of wireless communication network technologies, and in particular, to a method for transmitting a synchronization/physical broadcast channel block (synchronization/physical broadcast channel block, SS/PBCH block) and an apparatus. BACKGROUND A new radio (new radio, NR) system may be divided into two parts based on a frequency band location: an FR 1 (frequency range 1) and an FR 2. The FR 1 mainly refers to a spectrum below 6 GHz, and the FR 2 mainly refers to a spectrum from 6 GHz to 52.6 GHz. For example, subcarrier spacings (sub-carrier spacing, SCS) that can be supported by a frequency band in the FR 1 are 15 kHz and 30 kHz, and SCSs that can be supported by a frequency band in the FR 2 are 60 kHz, 120 kHz, and 240 kHz or a wider subcarrier spacing. A synchronization broadcast information block pattern (synchronization signal block pattern, SS/PBCH block pattern) varies with a different SCS. An SS/PBCH block is information first demodulated by a terminal device in an initial access process. The SS/PBCH block may mainly include a primary synchronization signal (primary synchronization signal, PSS), a secondary synchronization signal (secondary synchronization signal, SSS), and a physical broadcast channel (physical broadcast channel, PBCH). The terminal device can complete cell synchronization and coarse symbol-level timing synchronization by demodulating the PSS and the SSS. The PBCH may carry master information block (master information block, MIB) information configured at a higher layer. The terminal device demodulates the MIB information to complete system frame-level timing synchronization and obtain position information of a system information block 1/remaining minimum system information (system information block/remaining minimum system information, SIB1/RMSI). Further, the terminal device can obtain a type0 physical downlink control channel (type0 physical downlink control channel, type0-PDCCH) and a physical downlink shared channel (physical downlink shared channel, PDSCH) by using information in the SIB1/RMSI. As technologies evolve, available frequency bands keep growing. Therefore, how to transmit an SS/PBCH block needs to be urgently resolved. SUMMARY This application provides a method for transmitting an SS/PBCH block and an apparatus, to resolve a problem of a quantity of candidate indexes in transmission of an SS/PBCH block burst set and a problem of whether there are sufficient slots to transmit the SS/PBCH block burst set. According to a first aspect, this application provides a method for transmitting an SS/PBCH block. The method includes: a terminal device receives one SS/PBCH block; and obtains indication information based on the one SS/PBCH block. The indication information is used to indicate candidate indexes of at least one SS/PBCH block in an SS/PBCH block burst set, a quantity of the candidate indexes is greater than 64, and the SS/PBCH block burst set is a set in which the foregoing one SS/PBCH block is located. In the technical solution provided in this application, the indication information not only can indicate candidate indexes of at least one SS/PBCH block in the SS/PBCH block burst set, but also can indicate more candidate indexes, for example, indicate 128 or more candidate indexes. In addition, a network device may send more SS/PBCH blocks without being limited by 64 candidate indexes (that is, not limited by 64 candidate positions). The terminal device can learn, by using the indication information, a range of a maximum quantity of SS/PBCH blocks sent by the network device. In a possible implementation, the method further includes: the terminal device receives the SS/PBCH block burst set. According to a second aspect, this application provides a method for transmitting an SS/PBCH block. The method further includes: a terminal device receives configuration information. The configuration information includes a length of a discovery burst transmission window, the length of the discovery burst transmission window is greater than 5 ms, and the discovery burst transmission window is used by the terminal device to receive one or more SS/PBCH block burst sets. In the technical solution provided in this application, a network device may have more slots to send one or more SS/PBCH blocks. In addition, the terminal device needs to receive the SS/PBCH block in the DRS window. Therefore, with the length of the DRS window increased, the t