Method for performing D2D communication in wireless communication system and device therefor
One embodiment of the present invention relates to a method by which a terminal performs device-to-device (D2D) communication in a wireless communication system, the method comprising the steps of: converting into a radio resource control (RRC) connection state through the transmission of a service request; being allocated a resource for the D2D communication; transmitting a D2D signal through the allocated resource; and receiving a system information block (SIB) after transmitting the D2D signal, wherein if the SIB includes information on a resource pool, the terminal does not perform an RRC recovery-related operation even if RRC connection failure occurs.
1. A method for performing device-to-device (D2D) communication in a wireless communication system, the method performed by a User Equipment (UE) and comprising:
switching to a radio resource control (RRC) connection state via transmission of a service request;
receiving allocation of a resource for the D2D communication;
transmitting a D2D signal using the allocated resource;
receiving a system information block (SIB) after transmitting the D2D signal; and
not performing an RRC recovery-related operation if the SIB includes information related to a resource pool even if RRC connection failure occurs within a predetermined time before tracking area update (TAU) grant or TAU rejection is received.
2. The method according to claim 1 , wherein the RRC connection failure occurs when there are no pending user uplink data.
3. The method according to claim 1 , wherein the SIB is either SystemInformationBlockType18 or SystemInformationBlockType19.
4. The method according to claim 1 , wherein the RRC recovery related operation comprises transmitting a TAU request to a mobile management entity.
5. The method according to claim 1 , further comprising transmitting D2D data using a portion of the resource pool if the UE has D2D data for transmission.
6. The method according to claim 1 , wherein information indicating the RRC connection failure is transmitted from an RRC layer to a Non-Access-Stratum layer.
7. The method according to claim 1 , wherein a transmission mode is 1 when the service request is transmitted and a transmission mode indicated by the SIB is mode 2.
8. The method according to claim 1 , wherein a discovery type is type 2 when the service request is transmitted and a discovery type indicated by the SIB is type 1.
9. The method according to claim 1 , wherein the D2D signal is either a discovery signal or a communication signal.
10. A User Equipment (UE) performing device-to-device (D2D) communication in a wireless communication system, the UE comprising:
a transceiver configured to transmit and receive signals; and
a processor configured to:
switch to a radio resource control (RRC) connection state via the transmission of a service request;
receive an allocated resource for the D2D communication;
transmit a D2D signal using the allocated resource;
receive a system information block (SIB) after transmitting the D2D signal; and
not perform an RRC recovery-related operation if the SIB includes information related to a resource pool even if RRC connection failure occurs within a predetermined time before tracking area update (TAU) grant or TAU rejection is received.
11. The UE according to claim 10 , wherein the RRC connection failure occurs when there are no pending user uplink data.
12. The UE according to claim 10 , wherein the SIB is either SystemInformationBlockType18 or SystemInformationBlockType19.
13. The UE according to claim 10 , wherein the RRC recovery related operation comprises transmitting a TAU request to a mobility management entity.
14. The UE according to claim 10 , further comprising transmitting D2D data using a portion of the resource pool if the UE has D2D data for transmission.
15. The UE according to claim 10 , wherein information indicating the RRC connection failure is transmitted from an RRC layer to a Non-Access-Stratum layer.
16. The UE according to claim 10 , wherein a transmission mode is 1 when the service request is transmitted and a transmission mode indicated by the SIB is mode 2.
17. The UE according to claim 10 , wherein a discovery type is type 2 when the service request is transmitted and a discovery type indicated by the SIB is type 1.
18. The UE according to claim 10 , wherein the D2D signal is either a discovery signal or a communication signal.