Method and apparatus for performing vehicle communication

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

receiving sidelink radio bearer configuration information for configuring a sidelink radio bearer on a sidelink interface used for the vehicle communication from a base station;

configuring the sidelink radio bearer based on the sidelink radio bearer configuration information, and transmitting the sidelink radio bearer configuration information to another UE subject to the vehicle communication;

detecting a sidelink radio link failure when an acknowledged mode (AM) radio link control (RLC) entity linked to the sidelink radio bearer reaches a maximum number of retransmissions; and

indicating the detection of the sidelink radio link failure to a higher layer regardless of the radio resource control (RRC) state of the UE when the sidelink radio link failure is detected.

2. The method according to claim 1 , wherein the sidelink radio bearer configuration information comprises RLC bearer configuration information comprising information for bidirectional AM RLC configuration.

3. The method according to claim 1 , further comprising: transmitting sidelink failure information according to the sidelink radio link failure detection to the base station when the radio resource control (RRC) state of the UE is an RRC connection state.

4. The method according to claim 3 , wherein the sidelink failure information comprises destination L2 ID information.

5. The method according to claim 1 , wherein the sidelink identifier selected according to the sidelink radio bearer configuration comprises at least one of sidelink radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifier, and is selected by the UE or another UE.

6. The method according to claim 5 , wherein when the selected sidelink identifier is an identifier being used by another UE, another UE transmits RRC failure message to the UE.

7. The method according to claim 6 , wherein when the UE receives the RRC failure message from another UE, the UE transmits the RRC failure message to the base station.

8. The method according to claim 1 , wherein indicating the detection of the sidelink radio link failure to a higher layer further includes releasing the sidelink radio bearer and releasing PC5-RRC connection.

9. A method of controlling a vehicle communication by a base station, the method comprising:

transmitting sidelink radio bearer configuration information for configuring a sidelink radio bearer on a sidelink interface used for the vehicle communication to a user equipment (UE);

receiving sidelink failure information from the UE, which is generated when a number of data retransmissions in an acknowledged mode (AM) radio link control (RLC) entity configured in the UE reaches a maximum number of retransmissions based on the sidelink radio bearer configuration information,

wherein the UE configures the sidelink radio bearer using the sidelink interface based on the sidelink radio bearer configuration information and detects whether the number of data retransmissions through the radio bearer in the AM RLC entity linked to the sidelink radio bearer reaches the maximum number of retransmissions.

10. The method according to claim 9 , wherein the sidelink radio bearer configuration information is transmitted to another UE subject to vehicle communication through the UE.

11. The method according to claim 9 , wherein the sidelink radio bearer configuration information comprises RLC bearer configuration information comprising information for bidirectional AM RLC configuration.

12. The method according to claim 9 , wherein the sidelink failure information comprises destination L2 ID information.

13. A user equipment (UE) performing a vehicle communication, the UE comprising:

a receiver configured to receive sidelink radio bearer configuration information for configuring a sidelink radio bearer on a sidelink interface used for the vehicle communication from a base station;

a controller configured to configure the sidelink radio bearer based on the sidelink radio bearer configuration information, transmit the sidelink radio bearer configuration information to another UE subject to the vehicle communication, and detect a sidelink radio link failure when an acknowledged mode (AM) radio link control (RLC) entity linked to the sidelink radio bearer reaches a maximum number of retransmissions; and

a transmitter configured to transmit the sidelink radio bearer configuration information to another UE subject to the vehicle communication,

wherein the controller instructs the detection of the sidelink radio link failure to a higher layer regardless of a radio resource control (RRC) state of the UE when the sidelink radio link failure is detected.

14. The UE according to claim 13 , wherein the sidelink radio bearer configuration information comprises RLC bearer configuration information comprising information for bidirectional AM RLC configuration.

15. The UE according to claim 13 , wherein the transmitter transmits sidelink failure information according to the sidelink radio link failure detection to the base station when the RRC state of the UE is an RRC connection state.

16. The UE according to claim 15 , wherein the sidelink failure information comprises destination L2 ID information.

17. The UE according to claim 13 , wherein the sidelink identifier selected according to the sidelink radio bearer configuration comprises at least one of sidelink radio bearer identification information, sidelink RLC bearer identification information, and sidelink logical channel identifier, and is selected by the UE or another UE.

18. The UE according to claim 17 , wherein when the selected sidelink identifier is an identifier being used by another UE, another UE transmits RRC failure message to the UE.

19. The UE according to claim 18 , wherein when the RRC failure message is received, the transmitter transmits the RRC failure message to the base station.

20. The UE according to claim 13 , wherein when the sidelink radio link failure is detected, the controller releases the sidelink radio bearer and disconnects PC5-RRC connection.