Patent ID: 9113365
Filing Date: 2015-08-18
Classification: H04W

Abstract:
1. A method for offloading Internet data in an access network, comprising: judging, by an offloading device located on an IU interface between a access network and a core network, whether a Radio Access Bearer (RAB) data flow needs offloading according to a value of a specific parameter in an RAB message; when the offloading is needed, then performing Network Address Translation (NAT) and then transmitting offloaded data to the Internet by the offloading device; and when the offloading is not needed, then transparently transmitting the RAB data flow to the core network by the offloading device; wherein the method further comprising a step of setting the specific parameter by the core network and obtaining the specific parameter by the offloading device before offloading judgment, specifically: a User Equipment (UE) initiates a Packet Switched (PS) service, the core network, when performing RAB assignment, sets the value of the specific parameter according to user information and/or Packet Data Protocol (PDP) information; the core network initiates an RAB establishment procedure at the IU interface between the access network and the core network, and the offloading device obtains an RAB establishment message, parses and records the value of the specific parameter included in the RAB establishment message; wherein the value of the specific parameter is set by a network element Serving GPRS Support Node (SGSN) at the core network, the RAB establishment procedure is initiated from the SGSN to a Radio Network Controller (RNC) at the access network; wherein the value of the specific parameter comprises three value types, respectively indicating that offloading is necessary, offloading is not allowed and offloading is performed dynamically; when the value of the specific parameter is a value indicating that the offloading is performed dynamically, the offloading device dynamically judges whether a corresponding RAB needs offloading according to a system load.