Patent ID: 8799440
Filing Date: 2014-08-05
Classification: H04L,H04M,H04W

Abstract:
1. A method for performing policy and charging control for establishing multiple packet data network (PDN) connections to a single access point name (APN), comprising: after at least one PDN connection with at least one corresponding subsession of a S9 session is established for said APN in a roaming scenario, when relocation occurs on a bearer binding and event report function (BBERF), a destination BBERF sending a gateway control session establishment request message to a visited policy and charging rule function (PCRF) to request establishing a gateway control session, wherein a new packet data network connection identifier (PDN Connection ID) is carried in said gateway control session establishment request message; and said visited PCRF, according to said new PDN Connection ID, associating the gateway control session with said subsession of said S9 session that was associated with a Gx session in the previously established PDN connection to the same APN through an indication of internet protocol connectivity access network (IP-CAN) session modification message; wherein in a home routed roaming scenario, a policy and charging enforcement function (PCEF) is located in a home network, and the step of said visited PCRF associating the gateway control session with said subsession of said S9 session that was associated with the Gx session in the previously established PDN connection to the same APN through the indication of IP-CAN session modification message comprises: the home PCEF sending the indication of IP-CAN session modification message to a home PCRF, wherein said new PDN Connection ID is carried in said indication of IP-CAN session modification message; said home PCRF sending an S9 session and rule provision message to said visited PCRF after receiving said indication of IP-CAN session modification message, and said new PDN Connection ID is carried in said subsession of said S9 session associated with the Gx session modified by said indication of IP-CAN session modification message; and said visited PCRF associating said gateway control session with said subsession of said S9 session according to said new PDN Connection ID after receiving said S9 session and rule provision message; or wherein in a local breakout roaming scenario, the PCEF is located in a visited network, the visited PCEF sends the indication of IP-CAN session modification message to said visited PCRF, and said new PDN Connection ID is carried in said indication of IP-CAN session modification message, and the step of said visited PCRF associating the gateway control session with said subsession of said S9 session that was associated with the Gx session in the previously established PDN connection to the same APN through the indication of IP-CAN session modification message comprises: said visited PCRF associating the gateway control session with said Gx session modified by said indication of IP-CAN session modification message according to said new PDN Connection ID; and said visited PCRF associating said gateway control session with said subsession of said S9 session associated with said Gx session.