Method and apparatus for transmitting sidelink data in communication system

1. An operation method of a first terminal in a communication system, comprising:

transmitting, by a processor, first sidelink control information (SCI) to a second terminal, the first SCI including information indicating time resource(s) for sidelink communication, information indicating frequency resource(s) for the sidelink communication, information indicating a periodicity of physical resources for the sidelink communication, and information indicating a modulation and coding scheme (MCS) for the sidelink communication through a physical sidelink control channel (PSCCH);

transmitting, by the processor, second SCI to the second terminal, the second SCI including information used for determining whether the sidelink communication is stopped or not through a physical sidelink shared channel (PSSCH) scheduled by the first SCI; and

when it is determined that the sidelink communication is not stopped based on the second SCI, performing, by the processor, the sidelink communication with the second terminal based on the first SCI and the second SCI associated with the first SCI;

when it is determined that the sidelink communication is stopped based on the second SCI, the sidelink communication between the first terminal and the second terminal is not performed in a resource associated with the second SCI.

2. The operation method according to claim 1 , further comprising, before transmitting the first SCI, receiving, by the processor, a higher layer message from a base station, the higher layer message including information indicating the periodicity of the physical resources for the sidelink communication and information indicating a number of the physical resources configured by the first SCI.

3. The operation method according to claim 1 , wherein one or more information elements included in the first SCI are configured based on one or more information elements indicated by a higher layer message.

4. The operation method according to claim 1 , wherein the physical resources indicated by the first SCI are determined autonomously by the first terminal without scheduling of the base station.

5. The operation method according to claim 1 , further comprising receiving, by the processor, downlink control information (DCI) from the base station, wherein one or more information elements included in the first SCI are configured based on one or more information elements indicated by the DCI.

6. The operation method according to claim 1 , wherein the first SCI is used to schedule a retransmission operation of sidelink data, and the sidelink data is repeatedly transmitted through the physical resources indicated by the first SCI.

7. The operation method according to claim 1 , wherein the second SCI further includes informarion for indicating that a hybrid automatic repeat request (HARQ) feedback operation is enabled or disabled and information indicating a new data indicator (NDI), and a combination of one or more information elements among the information for the HARQ feedback operation and the information indicating the NDI indicates whether the sidelink communication is stopped or not.

8. An operation method of a first terminal in a communication system, comprising:

receiving, by a processor, a first message from a base station, the first message including configuration information of a type 1 resource pool;

identifying, by the processor, resources scheduled for transmitting a second sidelink data with a second priority within the type 1 resource pool;

generating, by the processor, a first sidelink data with a first priority which is higher than the second priority;

transmitting, by the processor, the first sidelink data to a second terminal by using the resources within the type 1 resource pool; and

transmitting, by the processor, sidelink control information (SCI) including scheduling information of the first sidelink data to the second terminal after transmitting the first sidelink data.

9. The operation method according to claim 8 , wherein the configuration information of the type 1 resource pool includes one or more information elements among information indicating that the transmission of the first sidelink data not scheduled by SCI is allowed, information indicating the first priority of the first sidelink data transmitted without scheduling by SCI, and information indicating a transmission pattern of the first sidelink data.

10. The operation method according to claim 8 , wherein the type 1 resource pool is a resource pool allowing the transmission of the first sidelink data not scheduled by SCI, and the type 1 resource pool is distinguished from a type 2 resource pool not allowing the transmission of the first sidelink data not scheduled by SCI.

11. The operation method according to claim 8 , wherein the first message is a higher layer message, a medium access control (MAC) control element (CE) message, or a physical (PHY) layer message.

12. The operation method according to claim 8 , wherein the SCI includes one or more information elements among information indicating time resource(s) for the first sidelink data, information indicating frequency resource(s) for the first sidelink data, information indicating a periodicity of physical resources for the first sidelink data, information indicating a number of the physical resources for the first sidelink data, and information indicating a modulation and coding scheme (MCS) for the first sidelink data.

13. The operation method according to claim 8 , wherein the SCI is transmitted after a preconfigured offset from a time of receiving the first message or a time of transmitting the first sidelink data.