Method and apparatus for configuring bandwidth part in sidelink communication

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

configuring, by a processor, a plurality of sidelink (SL) bandwidth parts (BWPs) used for SL communication between the first terminal and a second terminal;

transmitting, by the processor, configuration information of the plurality of SL BWPs to the second terminal via a default BWP;

transmitting, by the processor, an SL BWP list including one or more SL BWPs among the plurality of SL BWPs to the second terminal via the default SL BWP; and

performing, by the processor, SL communication with the second terminal using an initial SL BWP among the one or more SL BWPs included in the SL BWP list,

wherein the configuration information includes at least one of the information regarding a location, a size, a valid time interval of each of the plurality of SL BWPs, and combinations thereof.

2. The operation method according to claim 1 , wherein the one or more SL BWPs included in the SL BWP list are selected from a plurality of SL BWPs configured by the first terminal and the plurality of SL BWPs configured by the second terminal.

3. The operation method according to claim 1 , wherein the default SL BWP is configured by a base station through a combination of one or more of radio resource control (RRC) signaling, medium access control (MAC) layer signaling, and physical (PHY) layer signaling.

4. The operation method according to claim 1 , wherein the initial SL BWP is determined by the first terminal, and configuration information of the initial SL BWP is transmitted to the second terminal together with the SL BWP list.

5. The operation method according to claim 1 , wherein the plurality of SL BWPs belong to candidate SL BWPs configured by a base station.

6. The operation method according to claim 1 , wherein the SL communication is performed within a valid time interval in which the initial SL BWP is valid.

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

when characteristics of the SL communication between the first terminal and the second terminal satisfy one or more conditions, determining, by the processor, that switching of the initial SL BWP is necessary;

selecting, by the processor, a new SL BWP in the SL BWP list;

transmitting, by the processor, a switching request message including configuration information of the new SL BWP to the second terminal; and

performing, by the processor, the SL communication with the second terminal using the new SL BWP.

8. The operation method according to claim 7 , wherein the one or more conditions include: a valid time interval of the initial SL BWP expiring, a use of a transmission scheme different from a transmission scheme supported by the initial SL BWP is required, a quality of the SL communication in the initial SL BWP is less than or equal to a preconfigured threshold, a use of a SL BWP having a bandwidth different from a bandwidth of the initial SL BWP is required, and a zone to which at least one of the first terminal and the second terminal belongs is different from a zone associated with the initial SL BWP.

9. The operation method according to claim 7 , wherein when the SL communication is completed in the new SL BWP, the new SL BWP is switched to the default SL BWP or the initial SL BWP.

10. An operation method of a second terminal in a communication system, comprising:

receiving, at a processor from a first terminal, configuration information of a plurality of sidelink (SL) bandwidth parts (BWPs) configured by the first terminal through a default SL BWP;

configuring, by the processor, a candidate SL BWP list including one or more SL BWPs based on a plurality of SL BWPs configured by the second terminal and the plurality of SL BWPs configured by the first terminal;

transmitting, by the processor, the candidate SL BWP list to the first terminal via the default SL BWP;

receiving, by the processor, a final SL BWP list determined based on the candidate SL BWP list and configuration information of an initial SL BWP from the first terminal via the default SL BWP; and

performing, by the processor, SL communication with the first terminal using the initial SL BWP.

11. The operation method according to claim 10 , wherein the configuration information of the plurality of SL BWPs includes one or more of information regarding a location, a size, and a valid time interval of each of the plurality of SL BWPs.

12. The operation method according to claim 10 , wherein the default SL BWP is configured by a base station through a combination of one or more of radio resource control (RRC) signaling, medium access control (MAC) layer signaling, and physical (PHY) layer signaling.

13. The operation method according to claim 10 , further comprising:

when characteristics of the SL communication between the first terminal and the second terminal satisfy one or more conditions, determining, by the processor, that switching of the initial SL BWP is necessary;

selecting, by the processor, a new SL BWP in the SL BWP list;

transmitting, by the processor, a switching request message including configuration information of the new SL BWP to the first terminal; and

performing, by the processor, the SL communication with the first terminal using the new SL BWP.

14. The operation method according to claim 13 , wherein when the SL communication is completed in the new SL BWP, the new SL BWP is switched to the default SL BWP or the initial SL BWP.

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

configure a plurality of sidelink (SL) bandwidth parts (BWPs) used for SL communication between the first terminal and a second terminal;

receive a candidate SL BWP list including at least one SL BWP configured by the second terminal from the second terminal via a default SL BWP;

transmit a final SL BWP list including one or more SL BWPs among the plurality of SL BWPs and the at least one SL BWP included in the candidate SL BWP list to the second terminal through the default SL BWP; and

perform SL communication with the second terminal using an initial SL BWP among the one or more SL BWPs included in the final SL BWP list.

16. The first terminal according to claim 15 , wherein configuration information of the plurality of SL BWPs is exchanged between the first terminal and the second terminal via the default SL BWP, and the configuration information includes one or more of information regarding a location, a size, and a valid time interval of each of the plurality of SL BWPs.

17. The first terminal according to claim 15 , wherein the initial SL BWP is determined by the first terminal, and configuration information of the initial SL BWP is transmitted to the second terminal together with the final SL BWP list.

18. The first terminal according to claim 15 , wherein the at least one instruction further causes the processor to:

receive a switching request message from the second terminal, the switching request message including configuration information of a new SL BWP selected in the final SL BWP list;

transmit a switching response message to the second terminal, the switching response message indicating completion of configuration of the new SL BWP; and

perform the SL communication with the second terminal using the new SL BWP.

19. The first terminal according to claim 15 , wherein when the SL communication is completed in a new SL BWP, the new SL BWP is switched to the default SL BWP or the initial SL BWP.

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

configuring, by a processor, a plurality of sidelink (SL) bandwidth parts (BWPs) used for SL communication between the first terminal and a second terminal;

transmitting, by the processor, an SL BWP list including one or more SL BWPs among the plurality of SL BWPs to the second terminal via a default SL BWP; and

performing, by the processor, SL communication with the second terminal using an initial SL BWP among the one or more SL BWPs included in the SL BWP list,

wherein the initial SL BWP is determined by the first terminal, and configuration information of the initial SL BWP is transmitted to the second terminal together with the SL BWP list.