Method and apparatus for reconfiguring bandwidth part for groupcase in sidelink communication

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

configuring, by a processor, sidelink (SL) bandwidth parts (BWPs) used for groupcast sidelink communication;

transmitting, by the processor, a configuration information message including configuration information of the SL BWPs to participating terminals participating in the groupcast sidelink communication;

performing, by the processor, the groupcast sidelink communication with the participating terminals using a first SL BWP activated among the SL BWPs indicated by the configuration information;

in response to determining that switching of an active SL BWP is required, selecting, by the processor, a second SL BWP among the SL BWPs;

transmitting, by the processor, sidelink control information (SCI) including information indicating the second SL BWP to the participating terminals; and

performing, by the processor, the groupcast sidelink communication with the participating terminals using the second SL BWP activated among the SL BWPs.

2. The operation method according to claim 1 , wherein the SL BWPs are configured within a frequency range or candidate SL BWPs configured by a base station.

3. The operation method according to claim 1 , wherein the SL BWPs are configured based on one or more among capability information, transmission data characteristics, and channel states of the participating terminals.

4. The operation method according to claim 1 , wherein each of the configuration information message is transmitted and received via a default SL BWP preconfigured between the first terminal and the participating terminals.

5. The operation method according to claim 1 , wherein each of the configuration information includes an SL BWP list and information indicating an initial SL BWP.

6. The operation method according to claim 5 , wherein the SL BWP list includes at least one of a bandwidth, a subcarrier spacing, a starting resource block (RB) index, an ending RB index, an RB offset, a number of RBs, an activation time point, an activation duration, or a service type of the one or more SL BWPs.

7. The operation method according to claim 1 , further comprising:

in response to determining that reconfiguration of the SL BWPs is necessary, reconfiguring, by the processor, the SL BWPs; and

transmitting, by the processor, a reconfiguration information message including reconfiguration information of the SL BWPs to the participating terminals.

8. An operation method of a participating terminal participating in groupcast sidelink communication, the operation method comprising:

receiving a configuration information message including configuration information of sidelink (SL) bandwidth parts (BWPs);

performing, by the processor, the groupcast sidelink communication with a first terminal using a first SL BWP activated among the SL BWPs indicated by the configuration information;

receiving, from the first terminal, sidelink control information (SCI) including information indicating a second SL BWP among the SL BWPs; and

performing, by the processor, the groupcast sidelink communication with the first terminal using the second SL BWP.

9. The operation method according to claim 8 , wherein the SL BWPs are configured within a frequency range or candidate SL BWPs.

10. The operation method according to claim 8 , wherein the configuration information message is transmitted and received via a default SL BWP configured between the first terminal and the participating terminals.

11. The operation method according to claim 8 , wherein the configuration information includes an SL BWP list and information indicating an initial SL BWP.

12. The operation method according to claim 11 , wherein the SL BWP list includes at least one of a bandwidth, a subcarrier spacing, a starting resource block (RB) index, an ending RB index, an RB offset, a number of RBs, an activation time point, an activation duration, or a service type of the one or more SL BWPs.

13. The operation method according to claim 8 , further comprising:

transmitting, by the processor, an information response message including capability information of the participating terminal to the first terminal,

wherein the SL BWPs is determined in consideration of the capability information.

14. The operation method according to claim 8 , further comprising:

in response to determining that reconfiguration of the SL BWPs is necessary, transmitting, by the processor, a reconfiguration request message requesting the reconfiguration of the SL BWPs to the first terminal.

15. A first terminal in a communication system, the first terminal comprising:

a processor; and

a memory configured to store at least one instruction executable by the processor,

wherein the at least one instruction causes the processor to:

receive configuration information of candidate sidelink (SL) bandwidth parts (BWPs) from a base station;

in response to determining that switching of an active SL BWP is required, select a second SL BWP among the candidate SL BWPs;

transmit sidelink control information (SCI) including information indicating the second SL BWP to the participating terminals; and

perform the groupcast sidelink communication with the participating terminals using the second SL BWP activated among the candidate SL BWPs.