Patent ID: 8520546

Claim:
A method of setting up a radio bearer (RB) in a wireless communication system, the method comprising: transmitting, by a relay node, information related to quality of service (QoS) supported by the relay node to a core network (CN); relaying, by the relay node, a service request of a user equipment (UE) to the CN; and setting up a first RB over a first radio interface between the relay node and the UE for a service requested by the service request and setting up a second RB over a second radio interface between the relay node and a base station (BS) according to QoS required for the service if a first instruction is received from the CN and the first instruction indicates that the required QoS is supported by the relay node such that the UE is served by the base station via the first radio interface and the second radio interface, wherein: the UE modifies the QoS according to the QoS required for the service after receiving a QoS modification request from the CN if a second instruction, instead of the first instruction, is received from the CN, the second instruction indicating that the required QoS for the service is not supported by the relay node; the first RB is set up over the first radio interface between the relay node and the UE for the service and the second RB is set up over the second radio interface between the relay node and the base station according to the modified QoS such that the UE is served by the base station via the first radio interface and the second radio interface; the first RB is a UuRB and the first radio interface is a Uu interface; and the second RB is a UnRB and the second radio interface is a Un interface.