Communication method and device considering flexible slot format in NR V2X
Provided is a method for a first device ( 100 ) to perform sidelink transmission. The method may comprise: a step for performing sensing on a plurality of resources on the basis of a first resource unit including one or more symbols; a step for selecting a first transmission resource from the plurality of resources on the basis of the sensing; and a step for performing the sidelink transmission on the first transmission resource.
1. A method of performing wireless communication by a first device, the method comprising:
performing sensing for a plurality of resources, based on a plurality of first resource units in which each of the plurality of first resource units includes one or more symbols,
wherein the first device is not allowed to perform the sensing, based on a plurality of second resource units in which a number of one or more symbols of the each of the plurality of the second resource units is different from a number of the one or more symbols of the each of the plurality of the first resource units, and
wherein the plurality of resources include a first transmission resource for physical sidelink control channel (PSCCH) transmission and physical sidelink shared channel (PSSCH) transmission in a resource allocation mode for which the first device decides at least one transmission resource in a resource pool;
selecting a first transmission resource from the plurality of resources, based on the sensing; and
performing the PSCCH transmission and the PSSCH transmission related to the PSCCH transmission, based on the first transmission resource,
wherein based on the number of the one or more symbols of the each of the plurality of the first resource units being less than a number of symbols included in the first transmission resource, the sidelink transmission is skipped on the first transmission resource.
2. The method of claim 1 , wherein the sensing is performed for a resource in which the number of sidelink-related symbols is equal to the number of symbols included in each of the plurality of first resource units.
3. The method of claim 1 , wherein the sensing is performed for a resource in which a difference between the number of the sidelink-related symbols and the number of symbols included in each of the plurality of first resource units is less than or equal to a pre-configured number.
4. The method of claim 1 , wherein the plurality of resources are a set of resources in which the number of sidelink-related symbols is equal to the number of symbols included in each of the plurality of first resource units.
5. The method of claim 1 , wherein the plurality of resources are a set of resources in which a difference between the number of sidelink-related symbols and the number of symbols included in each of the plurality of first resource units is less than or equal to a pre-configured number.
6. The method of claim 1 , wherein, among the plurality of resources, the first transmission resource is selected from candidate resources selected based on a pre-configured ratio.
7. The method of claim 1 , wherein, among the plurality of resources, the first transmission resource is selected from a candidate resource selected based on a first ratio related to each of the plurality of first resource units or a second ratio related to each of the plurality of first resource units.
8. The method of claim 1 ,
wherein, based on that a transmission resource related to the number of symbols included in each of the plurality of first resource units is required in the sidelink transmission, the first transmission resource is selected from candidate resources selected based on a first ratio related to each of the plurality of first resource units, and
wherein, based on that a transmission resource related to the number of symbols included in each of the plurality of first resource units is required in the sidelink transmission, the first transmission resource is selected from candidate resources selected based on a second ratio related to each of the plurality of first resource units.
9. The method of claim 1 , wherein the first transmission resource is periodically reserved.
10. The method of claim 9 , further comprising transmitting information on a period of the first transmission resource and information on the number of symbols included in the first transmission resource, to a second device.
11. The method of claim 1 , further comprising
reserving a second transmission resource in a second slot including the sidelink-related symbol,
wherein the second slot is adjacent to a first slot in which the first transmission resource is reserved.
12. The method of claim 1 , wherein the first transmission resource is selected on a resource not related to a channel or signal for communication between a base station and a user equipment (UE).
13. A first device configured to perform wireless communication, the first device comprising:
one or more processors;
one or more transceivers; and
one or more memories operably connected to the one or more processors and storing instructions that, based on being executed by the one or more processors, cause the first device to perform operations,
wherein the operations comprise:
performing sensing for a plurality of resources, based on a plurality of first resource units in which each of the plurality of first resource units includes one or more symbols
wherein the first device is not allowed to perform the sensing, based on a plurality of second resource units in which a number of one or more symbols of the each of the plurality of the second resource units is different from a number of the one or more symbols of the each of the plurality of the first resource units, and
wherein the plurality of resources include a first transmission resource for physical sidelink control channel (PSCCH) transmission and physical sidelink shared channel (PSSCH) transmission in a resource allocation mode for which the first device decides at least one transmission resource in a resource pool;
selecting a first transmission resource from the plurality of resources, based on the sensing; and
performing the PSCCH transmission and the PSSCH transmission related to the PSCCH transmission, based on the first transmission resource,
wherein based on the number of the one or more symbols of the each of the plurality of the first resource units being less than a number of symbols included in the first transmission resource, the sidelink transmission is skipped on the first transmission resource.