Apparatus and method for granting transmission resources for direct communication between user equipments in wireless communication system

1. A method, performed by a user equipment (UE), of performing sidelink communication, the method comprising:

receiving a system information block (SIB) including information for determining a validity of system information for sidelink communication from a base station, the information including an area scope parameter, a value tag, and a system information area identification (ID);

obtaining a valid SIB for sidelink communication based on the information for determining a validity of system information for sidelink communication;

identifying a validity area for information of a pool of sidelink resources included in the valid SIB for sidelink communication;

autonomously determining a sidelink resource based on information of a pool of sidelink resources included in the valid SIB for sidelink communication within the identified validity area; and

performing sidelink communication with another UE using the determined sidelink resource,

wherein the UE is in an idle state or an inactive state, and

wherein the obtaining of the valid SIB for sidelink communication comprises:

considering a stored SIB for sidelink communication as the valid SIB for sidelink communication in case that an area scope parameter for the stored SIB for sidelink communication is the same as the area scope parameter in the received SIB, and a system information area ID for the stored SIB for sidelink communication is identical to the system information area ID in the received SIB, and

receiving, from the base station, the valid SIB for sidelink communication, in case that the area scope parameter for the stored SIB for sidelink communication is not the same as the area scope parameter in the received SIB.

2. The method of claim 1 , wherein the UE and the other UE are inside a coverage of a base station.

3. The method of claim 1 , further comprising determining that the stored SIB for sidelink communication is invalid in case that the area scope parameter for the stored SIB for sidelink communication is not the same as the area scope parameter in the received SIB.

4. The method of claim 1 , further comprising:

receiving information of a pool of sidelink resources from a base station by radio resource control (RRC) dedicated signaling; and

autonomously determining the sidelink resource based on the information of the pool of the sidelink resources received by the RRC dedicated signaling.

5. The method of claim 1 , further comprising autonomously determining the sidelink resource based on information of a preconfigured pool of sidelink resources.

6. A user equipment (UE) for performing sidelink communication, the UE comprising:

a transceiver; and

at least one processor coupled with the transceiver and configured to:

receive a system information block (SIB) including information for determining a validity of system information for sidelink communication from a base station, the information including an area scope parameter, a value tag, and a system information area identification (ID),

obtain a valid SIB for sidelink communication based on the information for determining a validity of system information for sidelink communication,

identify a validity area for information of a pool of sidelink resources included in the valid SIB for sidelink communication,

autonomously determine a sidelink resource based on information of a pool of sidelink resources included in the valid SIB for sidelink communication within the identified validity area, and

perform sidelink communication with another UE using the determined sidelink resource,

wherein the at least one processor is further configured to:

consider a stored SIB for sidelink communication as the valid SIB for sidelink communication in case that an area scope parameter for the stored SIB for sidelink communication is the same as the area scope parameter in the received SIB, and a system information area ID for the stored SIB for sidelink communication is identical to the system information area ID in the received SIB, and

receive, from the base station, the valid SIB for sidelink communication, in case that the area scope parameter for the stored SIB for sidelink communication is not the same as the area scope parameter in the received SIB.

7. The UE of claim 6 , wherein the UE and the other UE are inside a coverage of a base station.

8. The UE of claim 6 , wherein the at least one processor is further configured to determine that the stored SIB for sidelink communication is invalid in case that the area scope parameter for the stored SIB for sidelink communication is not the same as the area scope parameter in the received SIB.

9. The UE of claim 6 , wherein the at least one processor is further configured to:

receive information of a pool of sidelink resources from a base station by radio resource control (RRC) dedicated signaling, and

autonomously determine the sidelink resource based on the information of the pool of the sidelink resources received by the RRC dedicated signaling.

10. The UE of claim 6 , wherein the at least one processor is further configured to autonomously determine the sidelink resource based on information of a preconfigured pool of sidelink resources.