# US 12,120,054 B2 · Method for transmitting reference signal, method for receiving reference signal, base station and user equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,054 B2 - Document ID: US12120054B2 - Status: Granted - Kind: B2 - Application number: 18/206,553 - Filed: 2023-06-06 - Published: 2023-10-05 - Granted: 2024-10-15 - Earliest claimed: 2023-06-06 - Assignees: Beijing Xiaomi Mobile Software Co., Ltd. - Applicants: Beijing Xiaomi Mobile Software Co., Ltd. - Inventors: Mingju Li; Ming Zhang - Web page: https://patentgrep.com/patent/US12120054B2 ## CPC - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 56/001: {Synchronization between nodes} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for transmitting reference signal, a method for receiving reference signal, base station and user equipment are provided. The method includes: obtaining a plurality of possible transmission positions of the reference signal according to a position where a setting signal is located, wherein the setting signal is located in the reference signal and is used to determine an index of the reference signal, and the plurality of possible transmission positions comprise an initial possible transmission position of the reference signal; performing channel detection before transmitting the reference signal at each of the possible transmission positions; and transmitting, in response to detecting that a channel is idle, the reference signal at a corresponding possible transmission position; wherein the reference signal includes a SSB, and the setting signal comprises PBCH in the SSB; the indexes of the reference signal corresponding to the plurality of possible transmission positions are the same. ## Claims ### Claim 1 A method for transmitting a reference signal, performed by a base station, comprising: obtaining a plurality of possible transmission positions of the reference signal according to a position where a setting signal is located, wherein the setting signal is located in the reference signal and is used to determine an index of the reference signal, and the plurality of possible transmission positions comprise an initial possible transmission position of the reference signal; performing channel detection before transmitting the reference signal at each of the possible transmission positions; and transmitting, in response to detecting that a channel is idle, the reference signal at a corresponding possible transmission position; wherein the reference signal comprises a synchronization signal block (SSB), and the setting signal comprises PBCH in the SSB; wherein indexes of the reference signal corresponding to the plurality of possible transmission positions are the same; wherein the method further comprises: determining a signal in the reference signal as the setting signal; or determining different signals in the reference signal as the setting signal according to a transmission frequency point or a subcarrier interval of the reference signal. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: determining the setting signal before obtaining the plurality of possible transmission positions of the reference signal according to the position where the setting signal is located. ### Claim 3 (depends on 1) The method according to claim 1, wherein a sequence in which a plurality of signals of the reference signal is sent on the plurality of possible transmission positions is PSS, PBCH, SSS and PBCH. ### Claim 4 (depends on 1) The method according to claim 1, wherein the setting signal is located at the same position in the plurality of possible transmission positions. ### Claim 5 (depends on 1) A base station, comprising: at least one processor; and a memory, for storing instructions executable by the at least one processor; wherein the at least one processor is configured to implement steps of the method for transmitting a reference signal according to claim 1. ### Claim 6 (depends on 1) A non-transitory computer-readable storage medium having computer instructions stored therein that, when executed by at least one processor, implements steps of the method for transmitting a reference signal according to claim 1. ### Claim 7 A method for receiving a reference signal, performed by a user equipment (UE), comprising: receiving the reference signal sent by a base station; detecting a setting signal in the reference signal to determine a position where the setting signal is located, wherein the setting signal is used to determine an index of the reference signal; acquiring a signal set during a preset time interval according to the position where the setting signal is located; determining location information corresponding to the reference signal according to the signal set; and determining the index of the reference signal according to the location information, and performing time domain synchronization with the base station according to the index; wherein the reference signal comprises a synchronization signal block (SSB), and the setting signal comprises PBCH in the SSB; wherein indexes of the reference signal corresponding to the plurality of possible transmission positions are the same; wherein the method further comprises: determining a signal in the reference signal as the setting signal; or determining different signals in the reference signal as the setting signal according to a transmission frequency point or a subcarrier interval of the reference signal. ### Claim 8 (depends on 7) The method according to claim 7, wherein determining the location information corresponding to the reference signal according to the signal set comprises: comparing all signals at a second preset number of consecutive symbols comprising a symbol where the setting signal is located, in the signal set, with contents of a main reference signal or other reference signals respectively; in response to determining that a number of the signals at the second preset number of consecutive symbols that are successfully matched is one, using the second preset number of consecutive symbols that are successfully matched, as the location information; and in response to determining that the number of the signals at the second preset number of consecutive symbols that are successfully matched is more than one, starting from a last symbol of the signal set, using every second preset number of consecutive symbols as one group, and using symbols corresponding to a group comprising the symbol where the setting signal is located, as the location information. ### Claim 9 (depends on 7) The method according to claim 7, further comprising: determining the setting signal before detecting the setting signal for determining the index of the reference signal in the reference signal. ### Claim 10 (depends on 7) The method according to claim 7, wherein a sequence in which a plurality of signals of the reference signal is sent on the plurality of possible transmission positions is PSS, PBCH, SSS and PBCH. ### Claim 11 (depends on 7) The method according to claim 7, wherein the setting signal is located at the same position in the plurality of possible transmission positions. ### Claim 12 (depends on 6) A non-transitory computer-readable storage medium having computer instructions stored therein that, when executed by at least one processor, implements steps of the method for receiving a reference signal according to claim 6. ### Claim 13 A user equipment, comprising: at least one processor; and a memory, for storing instructions executable by the at least one processor; wherein the at least one processor is configured to: receive a reference signal sent by a base station; detect a setting signal in the reference signal to determine a position where the setting signal is located, wherein the setting signal is used to determine an index of the reference signal; acquire a signal set during a preset time interval according to the position where the setting signal is located; determine location information corresponding to the reference signal according to the signal set; and determine the index of the reference signal according to the location information, and perform time domain synchronization with the base station according to the index; wherein the reference signal comprises a synchronization signal block (SSB), and the setting signal comprises PBCH in the SSB; wherein indexes of the reference signal corresponding to the plurality of possible transmission positions are the same; wherein the at least one processor is further configured to: determine a signal in the reference signal as the setting signal; or determine different signals in the reference signal as the setting signal according to a transmission frequency point or a subcarrier interval of the reference signal. ### Claim 14 (depends on 13) The user equipment according to claim 13, wherein the at least one processor is further configured to: compare all signals at a second preset number of consecutive symbols comprising a symbol where the setting signal is located, in the signal set, with contents of a main reference signal or other reference signals respectively; in response to determining that a number of the signals at the second preset number of consecutive symbols that are successfully matched is one, use the second preset number of consecutive symbols that are successfully matched, as the location information; and in response to determining that the number of the signals at the second preset number of consecutive symbols that are successfully matched is more than one, starting from a last symbol of the signal set, use every second preset number of consecutive symbols as one group, and use symbols corresponding to a group comprising the symbol where the setting signal is located, as the location information. ### Claim 15 (depends on 13) The user equipment according to claim 13, wherein the at least one processor is further configured to: determine the setting signal before detecting the setting signal for determining the index of the reference signal in the reference signal. ### Claim 16 (depends on 13) The user equipment according to claim 13, wherein a sequence in which a plurality of signals of the reference signal is sent on the plurality of possible transmission positions is PSS, PBCH, SSS and PBCH. ### Claim 17 (depends on 13) The user equipment according to claim 13, wherein the setting signal is located at the same position in the plurality of possible transmission positions.