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EP-4742765-A2 - METHODS AND APPARATUSES FOR SYNCHRONIZATION SIGNAL TRANSMISSION

EP4742765A2EP 4742765 A2EP4742765 A2EP 4742765A2EP-4742765-A2

Abstract

Embodiments of the present disclosure relate to methods and an apparatuses for synchronization signal (SS) transmission. In example embodiments, a method implemented in a network device is provided. According to the method, information on a plurality of SS blocks to be transmitted by the network device is determined based on at least one of a frequency range and a value of subcarrier spacing. The information at least in part indicates timing for transmitting the plurality of SS blocks The plurality of SS blocks are transmitted to at least one terminal device based on the determined information.

Inventors

  • GAO, Yukai
  • WANG, GANG

Assignees

  • NEC Corporation

Dates

Publication Date
20260513
Application Date
20170811

Claims (15)

  1. A method implemented in a network device, comprising: determining, based on at least one of a frequency range and a value of subcarrier spacing, information on a plurality of synchronization signal (SS) blocks to be transmitted by the network device, the information at least in part indicating timing information for transmitting the plurality of SS blocks; and transmitting, based on the information, the plurality of SS blocks to at least one terminal device served by the network device, wherein the determining the information on the plurality of SS blocks comprises determining first information on Physical Broadcast Channel (PBCH), the first information including at least one of the following: a payload size for PBCH, second information on one or more fields in PBCH, periodicity of the plurality of SS blocks, the number of scrambling sequences for PBCH, the number of demodulation reference signal (DMRS) sequences for PBCH, mapping information on the scrambling sequences for PBCH, mapping information on the DMRS sequences for PBCH, wherein the transmitting the plurality of SS blocks comprises transmitting, based on the first information on PBCH, the plurality of SS blocks, and wherein the determining the information on the plurality of SS blocks further comprises: determining, based on at least one of the frequency range and the value of subcarrier spacing, a maximum number of SS blocks within a SS burst set and determining, at least based on the maximum number of SS blocks in a SS burst set, the number of the plurality of SS blocks to be transmitted by the network device, the plurality of SS blocks being included in the maximum number of SS blocks with same indexing.
  2. The method of claim 1, wherein the second information on the one or more fields in PBCH includes at least one of the following: whether each of the one or more fields is included in PBCH; and a respective size of each of the one or more fields.
  3. The method of claim 1, wherein the plurality of SS blocks include a first SS block, determining the information on the plurality of SS blocks further comprises: determining index information associated with the first SS block, the index information including at least one of a system frame number (SFN), a slot index, a symbol index and a SS block index within a SS burst set; and transmitting the plurality of SS blocks comprises: transmitting, based on the index information, the first SS block.
  4. The method of claim 3, wherein the method further comprises: indicating, in the one or more fields in PBCH associated with the first SS block, at least part of the index information to the at least one terminal device.
  5. The method of claim 3, wherein the method further comprises: indicating, by a DMRS sequence for PBCH associated with the first SS block, at least part of the index information to the at least one terminal device.
  6. The method of claim 3, wherein the method further comprises: indicating, by a scrambling sequence or a CRC mask for PBCH associated with the first SS block, at least part of the index information to the at least one terminal device.
  7. A method implemented in a terminal device, comprising: determining, based on at least one of a frequency range and a value of subcarrier spacing, information on a plurality of synchronization signal (SS) blocks transmitted by a network device serving the terminal device, the information at least in part indicating timing information for transmitting the plurality of SS blocks by the network device, the plurality of SS blocks being included in a maximum number of SS blocks with same indexing; and detecting, based on the information, at least one of the plurality of SS blocks, wherein the determining the information on the plurality of SS blocks comprises determining first information on Physical Broadcast Channel (PBCH), the first information including at least one of the following: a payload size for PBCH, second information on one or more fields in PBCH, periodicity of the plurality of SS blocks, the number of scrambling sequences for PBCH, the number of demodulation reference signal (DMRS) sequences for PBCH, mapping information on the scrambling sequences for PBCH, mapping information on the DMRS sequences for PBCH, and wherein the detecting the at least one of the plurality of SS blocks comprises detecting, based on the first information on PBCH, the at least one of the plurality of SS blocks.
  8. The method of claim 7, wherein the second information on the one or more fields in PBCH includes at least one of the following: whether each of the one or more fields is included in PBCH; and a respective size of each of the one or more fields.
  9. The method of claim 7, wherein the plurality of SS blocks include a first SS block, determining the information on the plurality of SS blocks further comprises: determining index information associated with the first SS block, the index information including at least one of a system frame number (SFN), a slot index, a symbol index and a SS block index within a SS burst set; and detecting the plurality of SS blocks comprises: detecting, based on the index information, the first SS block.
  10. The method of claim 9, wherein determining the index information comprises: determining at least part of the index information from one or more fields in PBCH associated with the first SS block.
  11. The method of claim 9, wherein determining the index information comprises: determining at least part of the index information from a DMRS sequence for PBCH associated with the first SS block.
  12. The method of claim 9, wherein determining the index information comprises: determining at least part of the index information from a scrambling sequence or a CRC mask for PBCH associated with the first SS block.
  13. The method of claim 9, wherein determining the index information comprises: determining at least part of the index information from a combination of DMRS sequences in different symbols associated with the first SS block.
  14. A network device comprising: a processor; and a memory coupled to the processor and storing instructions thereon, the instructions, when executed by the processor, causing the network device to perform actions, the actions comprising: determining, based on at least one of a frequency range and a value of subcarrier spacing, information on a plurality of synchronization signal (SS) blocks to be transmitted by the network device, the information at least in part indicating timing for transmitting the plurality of SS blocks; and transmitting, based on the information, the plurality of SS blocks to at least one terminal device served by the network device, wherein the determining the information on the plurality of SS blocks comprises determining first information on Physical Broadcast Channel (PBCH), the first information including at least one of the following: a payload size for PBCH, second information on one or more fields in PBCH, periodicity of the plurality of SS blocks, the number of scrambling sequences for PBCH, the number of demodulation reference signal (DMRS) sequences for PBCH, mapping information on the scrambling sequences for PBCH, mapping information on the DMRS sequences for PBCH, wherein the transmitting the plurality of SS blocks comprises transmitting, based on the first information on PBCH, the plurality of SS blocks, and wherein the determining the information on the plurality of SS blocks further comprises: determining, based on at least one of the frequency range and the value of subcarrier spacing, a maximum number of SS blocks within a SS burst set and determining, at least based on the maximum number of SS blocks in a SS burst set, the number of the plurality of SS blocks to be transmitted by the network device, the plurality of SS blocks being included in the maximum number of SS blocks with same indexing.
  15. A terminal device, comprising: a processor; and a memory coupled to the processor and storing instructions thereon, the instructions, when executed by the processor, causing the terminal device to perform actions, the actions comprising: determining, based on at least one of a frequency range and a value of subcarrier spacing, information on a plurality of synchronization signal (SS) blocks transmitted by a network device serving the terminal device, the information at least in part indicating timing for transmitting the plurality of SS blocks by the network device, the plurality of SS blocks being included in a maximum number of SS blocks with same indexing; and detecting, based on the information, at least one of the plurality of SS blocks, wherein the determining the information on the plurality of SS blocks comprises determining first information on Physical Broadcast Channel (PBCH), the first information including at least one of the following: a payload size for PBCH, second information on one or more fields in PBCH, periodicity of the plurality of SS blocks, the number of scrambling sequences for PBCH, the number of demodulation reference signal (DMRS) sequences for PBCH, mapping information on the scrambling sequences for PBCH, mapping information on the DMRS sequences for PBCH, and wherein the detecting the at least one of the plurality of SS blocks comprises detecting, based on the first information on PBCH, the at least one of the plurality of SS blocks.

Description

TECHNICAL FIELD Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods and an apparatuses for synchronization signal (SS) transmission. BACKGROUND With the development of communication technologies, multiple types of services or traffic have been proposed, for example, enhanced mobile broadband (eMBB) generally requiring high data rate, massive machine type communication (mMTC) typically requiring long battery lifetime, and ultra-reliable and low latency communication (URLLC). Meanwhile, aspects related to initial access and mobility are studied for new radio access. Conventionally, in order to access a network, a terminal device (for example, a user equipment (UE)) may detect a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in downlink (DL) signals transmitted from a surrounding network device (for example, an eNB or a gNB). Once the terminal device detects the PSS and SSS, it can obtain the physical cell identity (cell ID). Meanwhile, according to the positions of the PSS and SSS, the terminal device can determine the timing information for downlink transmission and complete the downlink synchronization. In New Radio Access (NR), different maximum number of SS blocks within a SS burst set for different frequency ranges have been agreed. For different values of subcarrier spacing, the mapping of SS blocks to slots (such as, candidate positions for SS blocks) may be different. Demodulation reference signal (DMRS) for Physical Broadcast Channel (PBCH) as well as PBCH contents have been studied. There is Quasi-co-location (QCL) association between Channel State Information-Reference Signal (CSI-RS) and SS blocks. For different frequency ranges, the number of SS blocks actually transmitted by the network device may be different. In this case, a scheme for configuring the SS blocks actually transmitted and indicating indices thereof to the terminal device needs to be considered. SUMMARY In general, example embodiments of the present disclosure provide methods and apparatuses for SS transmission. In a first aspect, there is provided a method implemented in a network device. According to the method, information on a plurality of synchronization signal (SS) blocks to be transmitted by the network device is determined based on at least one of a frequency range and a value of subcarrier spacing. The information at least in part indicates timing for transmitting the plurality of SS blocks. The plurality of SS blocks are transmitted to at least one terminal device based on the determined information. In a second aspect, there is provided a method implemented in a terminal device. According to the method, information on a plurality of synchronization signal (SS) blocks transmitted by a network device serving the terminal device is determined based on at least one of a frequency range and a value of subcarrier spacing. The information at least in part indicates timing for transmitting the plurality of SS blocks by the network device. At least one of the plurality of SS blocks is detected based on the determined information. In a third aspect, there is provided a network device. The network device comprises a processor and a memory coupled to the processor. The memory stores instructions that when executed by the processor, cause the network device to performs actions. The actions comprise: determining, based on at least one of a frequency range and a value of subcarrier spacing, information on a plurality of synchronization signal (SS) blocks to be transmitted by the network device, the information at least in part indicating timing for transmitting the plurality of SS blocks allocating at least one RS configuration from the plurality of RS configurations for a terminal device served by the network device, the at least one RS configuration indicating at least one RS port to be used for RS transmission; and transmitting, based on the information, the plurality of SS blocks to at least one terminal device served by the network device. In a fourth aspect, there is provided a terminal device. The terminal device comprises a processor and a memory coupled to the processor. The memory stores instructions that when executed by the processor, cause the network device to performs actions. The actions comprise: determining, based on at least one of a frequency range and a value of subcarrier spacing, information on a plurality of SS blocks transmitted by a network device serving the terminal device, the information at least in part indicating timing for transmitting the plurality of SS blocks by the network device; and detecting, based on the information, at least one of the plurality of SS blocks. In a fifth aspect, there is provided a computer readable medium having instructions stored thereon. The instructions, when executed on at least one processor, cause the at least one processor to carry out the method according to the firs