Method and apparatus for transmitting unicast request indication in wireless communication system
A method and apparatus for requesting a unicast bearer setup in a wireless communication system is provided. A user equipment (UE) receives a unicast request indication, which indicates that a target cell does not provide a multimedia broadcast multicast service (MBMS) service in which the UE is interested to the UE, from a network. Upon receiving the unicast request indication, the UE transmits a unicast bearer setup request to the network.
1. A method for requesting, by a user equipment (UE), a unicast bearer setup in a wireless communication system, the method comprising:
receiving a unicast request indication via a handover command message, which indicates that a target cell does not provide a multimedia broadcast multicast service (MBMS) service in which the UE is interested to the UE, from a serving cell of a network; and
upon receiving the unicast request indication, transmitting a unicast bearer setup request to the target cell of the network via a handover complete message.
2. The method of claim 1 , wherein the unicast bearer setup request is transmitted to the target cell and a group communication service enabler application server (GCSE-AS) of the network.
3. The method of claim 1 , wherein the unicast request indication is received for each MBMS service in which the UE is interested.
4. The method of claim 3 , wherein the unicast bearer setup request is transmitted for the MBMS service indicated by the unicast request indication.
5. The method of claim 1 , wherein the unicast request indication is received for each multicast-broadcast single-frequency network (MBSFN) area.
6. The method of claim 5 , wherein the unicast request indication is transmitted for the MBMS service which is provided in the MBSFN area indicated by the unicast request indication.
7. The method of claim 1 , wherein the unicast request indication is applied for a specific MBMS service.
8. The method of claim 7 , wherein the specific MBMS service is an MBMS service for group communication or public safety.
9. The method of claim 1 , further comprising:
upon transmitting the unicast bearer setup request, receiving the MBMS service in which the UE is interested over a unicast bearer, which is set up by the unicast bearer setup request.
10. A user equipment (UE) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit for transmitting or receiving a radio signal; and
a processor coupled to the RF unit, and configured to:
receive a unicast request indication for group communication via a handover command message, which indicates that a target cell does not provide a multimedia broadcast multicast service (MBMS) service in which the UE is interested to the UE, from a serving cell of a network; and
upon completing a handover procedure, transmit a unicast bearer setup request for group communication to the target cell of the network via a handover complete message.
11. The UE of claim 10 , wherein the unicast bearer setup request is transmitted to the target cell and a group communication service enabler application server (GCSE-AS) of the network.