# US 11,121,891 B2 · Method and apparatus for transmitting sounding reference signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,891 B2 - Document ID: US11121891B2 - Status: Granted - Kind: B2 - Application number: 16/804,865 - Filed: 2020-02-28 - Published: 2020-09-03 - Granted: 2021-09-14 - Earliest claimed: 2019-02-28 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Cheul Soon Kim; Sung Hyun Moon; Jung Hoon Lee - Web page: https://patentgrep.com/patent/US11121891B2 ## CPC - H04L 25/0226: {sounding signals per se} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 27/2607: {Cyclic extensions} - H04W 80/08: Upper layer protocols {(network arrangements or communication protocols for networked applications H04L67/00)} - H04L 27/2613: {Structure of the reference signals} - H04L 27/26136: {Pilot sequence conveying additional information} - 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 An operation method of a terminal for transmitting a sounding reference signal (SRS) to a base station in a wireless communication system may comprise receiving a higher layer message including information on a position of an SRS resource for transmission of the SRS from the base station; receiving a trigger signal from the base station, the trigger signal triggering the transmission of the SRS and including index information of the position of the SRS resource; performing a channel sensing operation on a radio resource indicated by the information on the positions of the SRS resource and the index information; and transmitting the SRS to the base station based on a result of the channel sensing. ## Claims ### Claim 1 An operation method of a terminal in a communication system, the operation method comprising: receiving first configuration information on sounding reference signal (SRS) from a base station, the first configuration information including resource mapping information of the SRS; receiving second configuration information including information on a first length of a cycle prefix (CP) extension and information on a second length of the CP extension from the base station; receiving control information including information indicating a length of a prefix signal prior to the SRS from the base station, the length of the prefix signal being determined based on one of a plurality of lengths of the CP extension including the first and second lengths; and transmitting the prefix signal having the indicated length and the SRS to the base station. ### Claim 2 (depends on 1) The operation method of claim 1, wherein each of the first and second lengths indicates a number of symbols for the CP extension. ### Claim 3 (depends on 1) The operation method of claim 1, wherein each of the first and second lengths depends on subcarrier spacing. ### Claim 4 (depends on 1) The operation method of claim 1, wherein the length of the prefix signal is a value obtained by subtracting a predefined value from the one of the plurality of lengths of the CP extension. ### Claim 5 (depends on 4) The operation method of claim 4, wherein the predefined value is 0, 25 μs, 16 μs+timing advance (TA), or 25 μs+TA. ### Claim 6 (depends on 4) The operation method of claim 4, wherein the predefined value indicates duration used for a listen before talk (LBT) operation. ### Claim 7 (depends on 1) The operation method of claim 1, wherein a location of the SRS is not restricted to a last symbol in a slot, and remaining symbol(s) after an ending symbol of the SRS in the slot is used for communication with other terminal. ### Claim 8 (depends on 1) The operation method of claim 1, wherein the prefix signal includes a CP of a first symbol of the SRS. ### Claim 9 (depends on 1) The operation method of claim 1, wherein the control information further includes information requesting transmission of the SRS. ### Claim 10 (depends on 1) The operation method of claim 1, wherein the resource mapping information of the SRS includes information on a location of a first symbol of the SRS and information on a number of symbols of the SRS. ### Claim 11 An operation method of a base station in a communication system, the operation method comprising: transmitting first configuration information on sounding reference signal (SRS) to a terminal, the first configuration information including resource mapping information of the SRS; transmitting second configuration information including information on a first length of a cycle prefix (CP) extension and information on a second length of the CP extension to the terminal; transmitting control information including information indicating a length of a prefix signal prior to the SRS to the terminal, the length of the prefix signal being determined based on one of a plurality of lengths of the CP extension including the first and second lengths; and receiving the prefix signal having the indicated length and the SRS from the terminal. ### Claim 12 (depends on 11) The operation method of claim 11, wherein each of the first and second lengths indicates a number of symbols for the CP extension. ### Claim 13 (depends on 11) The operation method of claim 11, wherein each of the first and second lengths depends on subcarrier spacing. ### Claim 14 (depends on 11) The operation method of claim 11, wherein the length of the prefix signal is a value obtained by subtracting a predefined value from the one of the plurality of lengths of the CP extension. ### Claim 15 (depends on 14) The operation method of claim 14, wherein the predefined value is 0, 25 μs, 16 μs+timing advance (TA), or 25 μs+TA. ### Claim 16 (depends on 14) The operation method of claim 14, wherein the predefined value indicates duration used for a listen before talk (LBT) operation. ### Claim 17 (depends on 11) The operation method of claim 11, wherein a location of the SRS is not restricted to a last symbol in a slot, and remaining symbol(s) after an ending symbol of the SRS in the slot is used for communication with other terminal. ### Claim 18 (depends on 11) The operation method of claim 11, wherein the prefix signal includes a CP of a first symbol of the SRS. ### Claim 19 (depends on 11) The operation method of claim 11, wherein the control information further includes information requesting transmission of the SRS. ### Claim 20 (depends on 11) The operation method of claim 11, wherein the resource mapping information of the SRS includes information on a location of a first symbol of the SRS and information on a number of symbols of the SRS.