# US 12,015,571 B2 · Reference signal transmitting and receiving method, base station, terminal, and readable medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,571 B2 - Document ID: US12015571B2 - Status: Granted - Kind: B2 - Application number: 16/321,639 - Filed: 2019-01-21 - Published: 2022-05-12 - Granted: 2024-06-18 - Earliest claimed: 2018-02-13 - Assignees: Spreadtrum Communications (Shanghai) Co., Ltd. - Applicants: Spreadtrum Communications (Shanghai) Co., Ltd. - Inventors: Xingya Shen; Hualei Wang - Web page: https://patentgrep.com/patent/US12015571B2 ## CPC - H04L 5/0023: {Time-frequency-space} - 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)} - H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0082: {at predetermined intervals} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 27/2602: {Signal structure} - H04L 27/2613: {Structure of the reference signals} - H04W 72/04: Wireless resource allocation - H04W 72/54: based on quality criteria - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract There is provided a method for transmitting a reference signal. The method for transmitting the reference signal includes: determining locations in time and frequency domains of a DRS, the DRS comprising at least one of a PSS, an SSS, a PBCH, a DMRS for PBCH, a CSI-RS for TRS, a CSI-RS for beam management, and a CSI-RS for acquiring channel state information; and transmitting the DRS at the locations in time and frequency domains of the DRS. ## Claims ### Claim 1 A method for transmitting a reference signal, comprising: determining locations in time domain and frequency domain of a Discover Reference Signal (DRS), the DRS comprising at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), a Demodulation Reference Signal (DMRS) for PBCH, a Channel State Information Reference Signal (CSI-RS) for Tracking Reference Signal (TRS), a CSI-RS for beam management, and a CSI-RS for acquiring channel state information; and transmitting the DRS at the determined locations in time domain and frequency domain of the DRS, wherein the CSI-RS for TRS is located in at least one of a symbol with an index of 0 and a symbol with an index of 4 in a first time slot of a Synchronization Signal burst (SS burst); or the CSI-RS for TRS is located in a symbol with an index of 0 in a third time slot of a Synchronization Signal burst (SS burst); or the CSI-RS for TRS is located in a symbol with an index of 9 in a fourth time slot of a Synchronization Signal burst (SS burst). ### Claim 2 (depends on 1) The method according to claim 1, wherein, in two time slots adjacent to a Synchronization Signal Block (SSB), there is at least one CSI-RS, wherein the CSI-RS includes one of CSI-RS for TRS, the CSI-RS for beam management, and the CSI-RS for acquiring channel state information, wherein the SSB includes the PSS, the SSS, the PBCH and the DMRS for PBCH of adjacent symbols. ### Claim 3 (depends on 2) The method according to claim 2, wherein the CSI-RS for beam management or the CSI-RS for acquiring channel state information is located in at least one symbol in each time slot of a Synchronization Signal burst (SS burst). ### Claim 4 (depends on 2) The method according to claim 2, wherein the CSI-RS has a frequency domain density of 3 and a location in frequency domain starting from a subcarrier 0 or a subcarrier N, wherein N is a natural number, and 0≤N≤11; or the CSI-RS has a frequency domain density of 1 and a location in frequency domain starting from a subcarrier 0 or a subcarrier N, wherein Nis a natural number, and 0≤N≤11; or the CSI-RS has a frequency domain density of ½ and a location in frequency domain starting from a subcarrier 0 or a subcarrier N, wherein N is a natural number, and 0≤N≤23. ### Claim 5 (depends on 4) The method according to claim 4, further comprising: indicating a value of N by high-layer signaling. ### Claim 6 (depends on 2) The method according to claim 2, further comprising: indicating a location in time domain of the SSB by high-layer signaling; and indicating a location in frequency domain of the SSB by the high-layer signaling. ### Claim 7 (depends on 6) The method according to claim 6, wherein the location in frequency domain includes a center frequency corresponding to the SSB. ### Claim 8 (depends on 7) The method according to claim 7, wherein the high-layer signaling includes offset information of the center frequency corresponding to the SSB from a common Physical Resource Block (PRB) index 0. ### Claim 9 A base station comprising a memory and a processor, the memory storing computer instructions, wherein the computer instructions cause the processor to: determine locations in time domain and frequency domain of a Discover Reference Signal (DRS), the DRS comprising at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), a Demodulation Reference Signal (DMRS) for PBCH, a Channel State Information Reference Signal (CSI-RS) for Tracking Reference Signal (TRS), a CSI-RS for beam management, and a CSI-RS for acquiring channel state information; and transmit the DRS at the determined locations in time domain and frequency domain of the DRS, wherein the CSI-RS for TRS is located in at least one of a symbol with an index of 0 and a symbol with an index of 4 in a first time slot of a Synchronization Signal burst (SS burst); or the CSI-RS for TRS is located in a symbol with an index of 0 in a third time slot of a Synchronization Signal burst (SS burst); or the CSI-RS for TRS is located in a symbol with an index of 9 in a fourth time slot of a Synchronization Signal burst (SS burst). ### Claim 10 (depends on 9) The base station according to claim 9, wherein, in two time slots adjacent to a Synchronization Signal Block (SSB), there is at least one CSI-RS, wherein the CSI-RS includes one of CSI-RS for TRS, the CSI-RS for beam management, and the CSI-RS for acquiring channel state information, wherein the SSB includes the PSS, the SSS, the PBCH and the DMRS for PBCH of adjacent symbols. ### Claim 11 (depends on 10) The base station according to claim 10, wherein the CSI-RS for beam management or the CSI-RS for acquiring channel state information is located in at least one symbol in each time slot of a Synchronization Signal burst (SS burst). ### Claim 12 (depends on 10) The base station according to claim 10, wherein the CSI-RS has a frequency domain density of 3 and a location in frequency domain starting from a subcarrier 0 or a subcarrier N, wherein N is a natural number, and 0≤N≤11; or the CSI-RS has a frequency domain density of 1 and a location in frequency domain starting from a subcarrier 0 or a subcarrier N, wherein N is a natural number, and 0≤N≤11; or the CSI-RS has a frequency domain density of ½ and a location in frequency domain starting from a subcarrier 0 or a subcarrier N, wherein N is a natural number, and 0≤N≤23. ### Claim 13 (depends on 12) The base station according to claim 12, wherein the computer instructions further cause the processor to indicate a value of N by high-layer signaling. ### Claim 14 (depends on 10) The base station according to claim 10, wherein the computer instructions further cause the processor to: indicate a location in time domain of the SSB by high-layer signaling; and indicate a location in frequency domain of the SSB by the high-layer signaling. ### Claim 15 (depends on 14) The base station according to claim 14, wherein the location in frequency domain includes a center frequency corresponding to the SSB. ### Claim 16 (depends on 15) The base station according to claim 15, wherein the high-layer signaling includes offset information of the center frequency corresponding to the SSB from a common Physical Resource Block (PRB) index 0. ### Claim 17 A non-transitory computer readable storage medium storing computer instructions, wherein the computer instructions cause a processor to: determine locations in time domain and frequency domain of a Discover Reference Signal (DRS), the DRS comprising at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), a Demodulation Reference Signal (DMRS) for PBCH, a Channel State Information Reference Signal (CSI-RS) for Tracking Reference Signal (TRS), a CSI-RS for beam management, and a CSI-RS for acquiring channel state information; and transmit the DRS at the determined locations in time domain and frequency domain of the DRS, wherein the CSI-RS for TRS is located in at least one of a symbol with an index of 0 and a symbol with an index of 4 in a first time slot of a Synchronization Signal burst (SS burst); or the CSI-RS for TRS is located in a symbol with an index of 0 in a third time slot of a Synchronization Signal burst (SS burst); or the CSI-RS for TRS is located in a symbol with an index of 9 in a fourth time slot of a Synchronization Signal burst (SS burst). ### Claim 18 (depends on 17) The non-transitory computer readable storage medium according to claim 17, wherein, in two time slots adjacent to a Synchronization Signal Block (SSB), there is at least one CSI-RS, wherein the CSI-RS includes one of CSI-RS for TRS, the CSI-RS for beam management, and the CSI-RS for acquiring channel state information, wherein the SSB includes the PSS, the SSS, the PBCH and the DMRS for PBCH of adjacent symbols.