Method for performing V2X communication in wireless communication system and device for same
A method for performing vehicle-to-everything (V2X) communication in a wireless communication system and a device for same are disclosed. Particularly, a method for a user equipment (UE) performing V2X communication with a PC5 interface in a wireless communication system includes: receiving from an upper layer a request for transmitting a V2X message; requesting radio resources, for V2X communication with a PC5 interface, to a base station or selecting radio resources for V2X communication with the PC5 interface; and performing transmission of V2X communication with the PC5 interface, wherein, if a UE has emergency packet data network (PDN) connection, an indication, indicating that transmission with the emergency PDN connection is a higher priority than the V2X communication with the PC5 interface, can be transmitted from the upper layer.
1. A method for performing, by a user equipment (UE) in a wireless communication system, the method comprising:
performing an attach procedure to establish an emergency packet data network (PDN) connection in a limited service state;
receiving, from an upper layer, a request for transmitting a vehicle-to-everything (V2X) message, wherein the request includes the V2X message and a V2X service identifier of a V2X service for the V2X message;
passing, to lower layers, the V2X message for transmission of V2X communication over PC5;
sending, to the lower layers, an indication to prioritize transmission over the PDN connection as compared to the transmission of the V2X communication over PC5, based on the UE having the emergency PDN connection, during the limited service state; and
performing the transmission of the V2X communication over PC5.
2. The method of claim 1 , wherein the performing the transmission of the V2X communication over PC5 comprises:
requesting, to a base station, radio resources for V2X communication over PC5; and
performing the transmission of the V2X communication over PC5.
3. The method of claim 2 , wherein, based on the UE being serviced by an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), the UE intends to use the radio resources provided by a cell of the E-UTRAN, and a Public Land Mobile Network (PLMN) in which the UE is registered belongs to a PLMN list authorized to use the V2X communication via the PC5, the radio resources for the V2X communication via the PC5 interface is requested to the base station.
4. The method of claim 1 , wherein the performing the transmission of the V2X communication over PC5 comprises:
selecting radio resources for the V2X communication over PC5; and
performing the transmission of the V2X communication over PC5.
5. The method of claim 4 , wherein, based on the UE not being serviced by an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and the UE is authorized to use the V2X communication over PC5, the radio resources for the V2X communication over PC5 is selected.
6. The method of claim 1 , wherein the transmission over the emergency PDN connection is prioritized over the transmission of the V2X communication over PC5 based on the indication.
7. The method of claim 6 , wherein the transmission over the emergency PDN connection is prioritized over the transmission of the V2X communication over PC5 irrespectively of a PPPP of a media access control (MAC) packet data unit (PDU) for the V2X communication.
8. The method of claim 1 , wherein the request further includes at least one of a data type in the V2X message, or a V2X message priority.
9. The method of claim 1 , wherein an identifier of a bearer corresponding to the emergency PDN connection is transmitted together with the indication.
10. The method of claim 1 , wherein only when the UE is in an EPS Mobility Management-CONNECTED (EMM) mode, the indication is transmitted.
11. The method of claim 1 , wherein whether the transmission of the V2X communication over PC5 is prioritized is determined based on proximity-based services (ProSe) priority per packet (PPPP), and
wherein the transmission over the emergency PDN connection is prioritized higher than the the transmission of the V2X communication over PC5, regardless of the PPPP, in case that the indication is sent.
12. The method of claim 1 , further comprising:
transmitting, to a base station, a radio resource control (RRC) connection request message including information related to establishment cause for at least one of emergency or vehicle-to-everything (V2X) communication; and
receiving, from the base station, a RRC connection setup massage.
13. A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
at least one processor coupled to the transceiver and configured to:
perform an attach procedure to establish an emergency packet data network (PDN) connection in a limited service state;
receive, from an upper layer, a request for transmitting a vehicle-to-everything (V2X) message, wherein the request includes the V2X message and a V2X service identifier of a V2X service for the V2X message,
passing, to lower layers, the V2X message for transmission of V2X communication over PC5;
sending, to the lower layers, an indication to prioritize transmission over the emergency PDN connection as compared to the transmission of the V2X communication over PC5, based on the UE having the emergency PDN connection, during the limited service state; and
performing the transmission of the V2X communication over PC5.