UE context retrieve for V2X services

1. A method comprising:

receiving, by a first base station from a wireless device, a radio resource control (RRC) connection resume request message comprising a resume identity;

sending, by the first base station to a second base station based at least on the resume identity, a retrieve user equipment (UE) context request message comprising the resume identity;

receiving, by the first base station from the second base station in response to the retrieve UE context request message, a retrieve UE context response message comprising a UE context information element (IE) comprising one or more temporary mobile group identities (TMGIs) of one or more multimedia broadcast multicast service (MBMS) services that the wireless device is receiving or interested to receive, wherein the UE context IE is retrieved based at least on the resume identity; and

transmitting, by the first base station, transport blocks comprising MBMS transport blocks to provide at least one of the one or more MBMS services to the wireless device.

2. The method of claim 1 , further comprising determining, by the first base station based on the one or more TMGIs, one or more MBMS resource configuration parameters for the at least one of the one or more MBMS services.

3. The method of claim 1 , wherein the UE context IE further comprises:

a first identifier of a first packet flow of one or more packets flows;

at least one first vehicle-to-everything (V2X) parameter of the first packet flow indicating whether the first packet flow is for at least one first V2X service; and

a quality of service (QoS) indicator of the first packet flow.

4. The method of claim 1 , wherein the retrieve UE context response message further comprises at least one of:

an MBMS frequency;

an MBMS session identifier;

a group-radio network temporary identifier (G-RNTI) of an MBMS service or a V2X service;

a destination layer-2 identifier for an MBMS service or a V2X service;

an MBMS service priority; or

a V2X service priority.

5. The method of claim 1 , further comprising transmitting, by the first base station, at least one configuration message of a system information block type 20 (SIB20) or a single cell point to multipoint (SCPTM) configuration message, the at least one configuration message comprising one or more parameters for the at least one of the one or more MBMS services.

6. The method of claim 1 , further comprising updating, by the first base station, one or more traffic parameters of at least one of the one or more MBMS services.

7. The method of claim 1 , further comprising increasing, by the first base station, a priority of at least one of the one or more MBMS services.

8. A base station comprising:

one or more processors;

memory storing instructions that, when executed by the one or more processors, cause the base station to:

receive, from a wireless device, a radio resource control (RRC) connection resume request message comprising a resume identity;

send, to a second base station based at least on the resume identity, a retrieve user equipment (UE) context request message comprising the resume identity;

receive, from the second base station in response to the retrieve UE context request message, a retrieve UE context response message comprising a UE context information element (IE) comprising one or more temporary mobile group identities (TMGIs) of one or more multimedia broadcast multicast service (MBMS) services that the wireless device is receiving or interested to receive, wherein the UE context IE is retrieved based at least on the resume identity; and

transmit transport blocks comprising MBMS transport blocks to provide at least one of the one or more MBMS services to the wireless device.

9. The base station of claim 8 , wherein the instructions, when executed, further cause the base station to determine, based on the one or more TMGIs, one or more MBMS resource configuration parameters for the at least one of the one or more MBMS services.

10. The base station of claim 8 , wherein the UE context IE further comprises:

a first identifier of a first packet flow of one or more packets flows;

at least one first vehicle-to-everything (V2X) parameter of the first packet flow indicating whether the first packet flow is for at least one first V2X service; and

a quality of service (QoS) indicator of the first packet flow.

11. The base station of claim 8 , wherein the retrieve UE context response message further comprises at least one of:

an MBMS frequency;

an MBMS session identifier;

a group-radio network temporary identifier (G-RNTI) of an MBMS service or a V2X service;

a destination layer-2 identifier for an MBMS service or a V2X service;

an MBMS service priority; or

a V2X service priority.

12. The base station of claim 8 , wherein the instructions, when executed, further cause the base station to transmit at least one configuration message of a system information block type 20 (SIB20) or a single cell point to multipoint (SCPTM) configuration message, the at least one configuration message comprising one or more parameters for the at least one of the one or more MBMS services.

13. The base station of claim 8 , wherein the instructions, when executed, further cause the base station to update one or more traffic parameters of the at least one of the one or more MBMS services.

14. The base station of claim 8 , wherein the instructions, when executed, further cause the base station to increase a priority of the at least one of the one or more MBMS services.

15. A method comprising:

transmitting, by a first base station to a wireless device, a radio resource control (RRC) connection release message comprising a resume identity;

receiving, by the first base station from a second base station, a retrieve user equipment (UE) context request message comprising the resume identity; and

transmitting, by the first base station to the second base station in response to the retrieve UE context request message, a retrieve UE context response message comprising a UE context information element (IE) comprising one or more temporary mobile group identities (TMGIs) of one or more multimedia broadcast multicast service (MBMS) services that the wireless device is receiving or interested to receive, wherein the UE context IE is retrieved based at least on the resume identity.

16. The method of claim 15 , further comprising transmitting, by the second base station, transport blocks comprising MBMS transport blocks to provide at least one of the one or more MBMS services to the wireless device.

17. The method of claim 15 , further comprising receiving, by the second base station from the wireless device, an RRC connection resume request message comprising the resume identity.

18. The method of claim 15 , further comprising determining, by the second base station based on the one or more TMGIs, one or more MBMS resource configuration parameters for the at least one of the one or more MBMS services.

19. The method of claim 15 , wherein the UE context IE further comprises:

a first identifier of a first packet flow of one or more packets flows;

at least one first vehicle-to-everything (V2X) parameter of the first packet flow indicating whether the first packet flow is for at least one first V2X service; and

a quality of service (QoS) indicator of the first packet flow.

20. The method of claim 15 , wherein the retrieve UE context response message further comprises at least one of:

an MBMS frequency;

an MBMS session identifier;

a group-radio network temporary identifier (G-RNTI) of an MBMS service or a V2X service;

a destination layer-2 identifier for an MBMS service or a V2X service;

an MBMS service priority; or

a V2X service priority.