Patent ID: 9020512
Filing Date: 2015-04-28
Classification: H04W

Abstract:
1. A radio signal transmission method used in a radio signal transmission system comprising a core network (CN), at least one base station and at least one user equipment (UE), the radio signal transmission method comprising: determining by the base station whether to activate CS off-loading after the UE initiates a circuit switch (CS) call; determining by the base station whether identification (ID) codes of all call parties reside on the same base station or on the same group of base stations of the radio signal transmission system, if CS off-loading is to be activated; determining by the base station whether to off-load only a user-plane data if the ID codes of the call parties reside on the same base station or on the same group of base stations; processing a signaling by the base station and directly forwarding the user-plane data to another call party of the call via the base station if the base station determines to off-load not only the user-plane data; and controlling the signaling by the CN and directly forwarding the user-plane data to another call party of the call via the base station if the base station determines to off-load only the user-plane data; wherein, if the base station determines not to activate CS off-loading, then the base station transmits the signaling to the CN for the CN to control the signaling, and the user-plane data from the UE of the call parties is forwarded to another call party of the call via the base station, the CN and an Internet.