A method of establishing a radio bearer, wherein the method comprises: segmenting (S501), by a User Equipment, UE, IP data streams of a higher-layer service into a plurality of service data streams with different Quality of Service, QoS, and determining QoS parameters corresponding to each service data stream, according to media parameter information of the higher-layer service; sending (S502), by the UE, a Radio Bearer Setup Request carrying information of the service data streams of the higher-layer service and the corresponding QoS parameters to a radio Access Point, AP; establishing (S506), by the UE, corresponding radio bearers for the service data streams according to QoS parameters available for the AP to the service data streams in a Radio Bearer Setup Response returned from the AP upon reception of the Radio Bearer Setup Response, and establishing mapping relationships between the service data streams and the corresponding radio bearers; and returning (S507), by the UE, a Radio Bearer Setup Complete Response message to the AP; wherein before the UE sends the Radio Bearer Setup Request to the AP, the method further comprises: for each service data stream, determining, by the UE, whether there is a radio bearer capable of satisfying the QoS of the service data stream between the UE and the AP; if so, then sending (S601) a Radio Bearer Modify Message to the AP to instruct the AP to reallocate a radio resource for the radio bearer capable of satisfying the QoS of the service data stream; if not, then determining information of the service data stream and the corresponding QoS parameters need to be carried in the Radio Bearer Setup Request. segmenting (S501), by a User Equipment, UE, IP data streams of a higher-layer service into a plurality of service data streams with different Quality of Service, QoS, and determining QoS parameters corresponding to each service data stream, according to media parameter information of the higher-layer service; sending (S502), by the UE, a Radio Bearer Setup Request carrying information of the service data streams of the higher-layer service and the corresponding QoS parameters to a radio Access Point, AP; establishing (S506), by the UE, corresponding radio bearers for the service data streams according to QoS parameters available for the AP to the service data streams in a Radio Bearer Setup Response returned from the AP upon reception of the Radio Bearer Setup Response, and establishing mapping relationships between the service data streams and the corresponding radio bearers; and returning (S507), by the UE, a Radio Bearer Setup Complete Response message to the AP; wherein before the UE sends the Radio Bearer Setup Request to the AP, the method further comprises: for each service data stream, determining, by the UE, whether there is a radio bearer capable of satisfying the QoS of the service data stream between the UE and the AP; if so, then sending (S601) a Radio Bearer Modify Message to the AP to instruct the AP to reallocate a radio resource for the radio bearer capable of satisfying the QoS of the service data stream; if not, then determining information of the service data stream and the corresponding QoS parameters need to be carried in the Radio Bearer Setup Request. for each service data stream, determining, by the UE, whether there is a radio bearer capable of satisfying the QoS of the service data stream between the UE and the AP; if so, then sending (S601) a Radio Bearer Modify Message to the AP to instruct the AP to reallocate a radio resource for the radio bearer capable of satisfying the QoS of the service data stream; if not, then determining information of the service data stream and the corresponding QoS parameters need to be carried in the Radio Bearer Setup Request. <EOS>