# US 2021/0243728 A1 · Method and apparatus for transmitting signal by sidelink terminal in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243728 A1 - Document ID: US20210243728A1 - Status: Published application - Kind: A1 - Application number: 17/262,864 - Filed: 2019-07-26 - Published: 2021-08-05 - Earliest claimed: 2018-07-26 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungmin LEE; Hyukjin CHAE; Kyuhwan KWAK - Web page: https://patentgrep.com/patent/US20210243728A1 ## CPC - H04L 27/2602: {Signal structure} - H04W 72/02: Selection of wireless resources by user or terminal - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0473: {the resource being transmission power} - H04W 72/20: Control channels or signalling for resource management - H04W 72/56: based on priority criteria - H04W 92/18: between terminal devices - 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 embodiment of the present invention relates to a signal transmission method for transmitting a signal by a sidelink terminal in a wireless communication system, the method comprising the steps of: transmitting a physical sidelink control channel (PSCCH) by using a plurality of symbols in a slot; and transmitting a physical sidelink shared channel (PSSCH) related to the PSCCH, wherein the number of symbols used for the PSCCH transmission is changed according to a change in the number of symbols included in the slot. ## Claims ### Claim 1 A method for transmitting a signal by a sidelink UE in a wireless communications system, the method comprising the steps of: transmitting a physical sidelink control channel (PSCCH) by using a plurality of symbols in a slot; and transmitting a physical sidelink shared channel (PSSCH) related to the PSCCH, wherein the number of symbols used for the PSCCH transmission is changed based on a change in the number of symbols included in the slot. ### Claim 2 (depends on 1) The method of claim 1, wherein a relationship between the number of symbols included in the slot and the number of symbols used for the PSCCH transmission is preconfigured, delivered through physical layer signaling or delivered through higher layer signaling. ### Claim 3 (depends on 1) The method of claim 1, wherein a payload size of the PSCCH or a size of a resource block (RB) to which the PSCCH is transmitted is changed based on the change in the number of symbols included in the slot. ### Claim 4 (depends on 1) The method of claim 1, wherein when the PSCCH is subjected to FDM with the PSSCH in at least a portion of the slot, a transmission power used for the PSCCH is excluded from a total available transmission power and then a transmission power per RE of the PSSCH is determined. ### Claim 5 (depends on 4) The method of claim 4, wherein the determined transmission power is also used for a transmission power per RE of PSSCH which is not subjected to FDM with the PSCCH in at least a portion of the slot. ### Claim 6 (depends on 1) The method of claim 1, wherein MPR (Maximum Power Reduction) applied when the PSCCH is subjected to FDM with the PSSCH in at least a portion of the slot is applied even in the case that the PSCCH is not subjected to FDM with the PSSCH. ### Claim 7 (depends on 1) The method of claim 1, wherein the PSCCH is repeatedly transmitted through at least one symbol in the slot. ### Claim 8 (depends on 7) The method of claim 7, wherein the repeated transmission of the PSCCH is performed when the symbols used for the PSCCH transmission are smaller than those used for the PSSCH transmission related to the PSCCH. ### Claim 9 (depends on 7) The method of claim 7, wherein the repeatedly transmitted PSCCH has a redundancy version (RV) of a preconfigured pattern. ### Claim 10 (depends on 9) The method of claim 9, wherein the repeated transmission of the PSCCH or the preconfigured pattern is indicated by a demodulation reference signal (DMRS) for the PSCCH. ### Claim 11 (depends on 10) The method of claim 10, wherein the repeated transmission of the PSCCH or the preconfigured pattern is indicated by DMRS base sequence set to a predetermined value or initialization ID. ### Claim 12 (depends on 7) The method of claim 7, wherein the number of times for the repeated transmission is determined by a UE that transmits the PSCCH, by considering one or more of packet priority and packet arrival coverage. ### Claim 13 A sidelink UE for transmitting or receiving a signal in a wireless communication system, the sidelink UE comprising: a memory; and a processor coupled to the memory, wherein the processor transmits a physical sidelink control channel (PSCCH) by using a plurality of symbols in a slot, and transmits a physical sidelink shared channel (PSSCH) related to the PSCCH, and the number of symbols used for the PSCCH transmission is changed based on a change in the number of symbols included in the slot.