# US 2021/0243627 A1 · V2x communication performance method performed by v2x terminal in wireless communication system, and terminal using the method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243627 A1 - Document ID: US20210243627A1 - Status: Published application - Kind: A1 - Application number: 17/234,050 - Filed: 2021-04-19 - Published: 2021-08-05 - Earliest claimed: 2017-03-25 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungmin Lee; Hyukjin Chae - Web page: https://patentgrep.com/patent/US20210243627A1 ## CPC - G08G 1/096716: {where the received information does not generate an automatic action on the vehicle control} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - G08G 1/005: including pedestrian guidance indicator - G08G 1/096783: {where the origin of the information is a roadside individual element} - G08G 1/096791: {where the origin of the information is another vehicle} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 4/46: for vehicle-to-vehicle communication [V2V] - H04W 72/52: based on load - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04W 76/14: Direct-mode setup - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04W 72/0446: Resources in time domain, e.g. slots or frames - G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93}) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present invention provides a V2X communication performance method which is performed by a vehicle-to-X (V2X) terminal in a wireless communication system, and which is based on a relatively short transmission time interval (S-TTI) compared to a legacy transmission time interval (L-TTI), whereby a channel busy ratio (CBR) or a channel occupancy ratio (CR) for the S-TTI-based V2X communication is measured, and the S-TTI-based V2X communication is performed based on the measured CBR or CR, wherein the S-TTI has a variable length. ## Claims ### Claim at position 1 1-11. (canceled) ### Claim 12 A method for performing a vehicle to X (V2X) communication based on a short transmission time interval (S-TTI) shorter than a legacy transmission time interval (L-TTI) in a wireless communication system, the method performed by a V2X User Equipment (UE) and comprising: measuring a channel busy ratio (CBR) or a channel occupancy ratio (CR) for the V2X communication based on the S-TTI; and performing the V2X communication based on the S-TTI and either the measured CBR or the measured CR, wherein the S-TTI has a variable length, wherein the L-TTI corresponds to a plurality of the S-TTIs, wherein, when the V2X UE measures the CBR or the CR, the measurement is performed in a subchannel unit based on the S-TTI and a duration of the measurement is determined in S-TTI units, and wherein the V2X UE performs the V2X communication on a resource pool on which only V2X communications based on the S-TTI are existed. ### Claim 13 (depends on 12) The method of claim 12, wherein, when the S-TTI is a basic resource unit, the L-TTI is a combination of K basic resource units, and wherein the K is a positive integer. ### Claim 14 (depends on 12) The method of claim 12, wherein, when the L-TTI is a basic resource unit, the S-TTI is a division of the basic resource unit divided into X, and wherein the X is a positive integer. ### Claim 15 (depends on 12) The method of claim 12, wherein, when the S-TTI on a timing of subtracting a minimum processing time from the S-TTI for the V2X UE to perform a transmission corresponds to a Wth S-TTI in the L-TTI having index Z value, the V2X UE measures the CBR in the subchannel unit based on the S-TTI from a timing of subtracting 100 S-TTI lengths from the Wth S-TTI in the L-TTI having index Z value to a timing of subtracting 1 S-TTI length from the Wth S-TTI in the L-TTI having index Z value, wherein the Z is an integer of 0 or more, and wherein the W is a positive integer. ### Claim 16 (depends on 12) The method of claim 12, wherein, when the S-TTI on a timing of subtracting a minimum processing time from the S-TTI for the V2X UE to perform a transmission corresponds to a Wth S-TTI in the L-TTI having index Z value, the V2X UE measures the CR in the subchannel unit based on the S-TTI from a timing of subtracting A from the Wth S-TTI in the L-TTI having index Z value to a timing of adding B to the Wth S-TTI in the L-TTI having index Z value, wherein the Z is an integer of 0 or more, wherein the W is a positive integer, wherein each the A and the B is in a unit of 1 S-TTI length, wherein a value adding the B and 1 S-TTI length to the A has 1000 S-TTI lengths, and wherein the A is equal to or greater than 500 S-TTI lengths. ### Claim 17 A vehicle-to-X (V2X) User Equipment (UE) for performing a V2X communication based on a short transmission time interval (S-TTI) shorter than a legacy transmission time interval (L-TTI) in a wireless communication system, comprising: a transceiver for transmitting and receiving a radio signal; and a processor operating with being combined with the transceiver, wherein the processor is configured to: measure a channel busy ratio (CBR) or a channel occupancy ratio (CR) for the V2X communication based on the S-TTI; and perform the V2X communication based on the S-TTI and either the measured CBR or the measured CR, wherein the S-TTI has a variable length, wherein the L-TTI corresponds to a plurality of the S-TTIs, wherein, when the V2X UE measures the CBR or the CR, the measurement is performed in a subchannel unit based on the S-TTI and a duration of the measurement is determined in S-TTI units, and wherein the V2X UE performs the V2X communication on a resource pool on which only V2X communications based on the S-TTI are existed.