Patent ID: 9137652
Filing Date: 2015-09-15
Classification: H04M,H04W

Abstract:
1. A method for performing policy and charging control in a roaming scenario, comprising: a User Equipment (UE) accessing a first access network, establishing a Packet Data Network (PDN) connection for the UE; establishing a first gateway control session, a Gx session, an S9 session and a first subsession of the S9 session for performing a policy and charging control on said PDN connection, wherein the Gx session is associated with the first subsession of the S9 session; and in a process of a Bearer Binding and Event Report Function (BBERF) relocation in handover of the UE from the first access network to a second access network: a destination BBERF in the second access network sending an indication message of gateway control session establishment, which includes a user identifier, a PDN identifier and a PDN connection identifier for uniquely identifying said PDN connection, to a visited Policy and Charging Rule Function (PCRF) so as to establish a second gateway control session; after receiving the indication message of gateway control session establishment, said visited PCRF sending a request message, which includes said user identifier, said PDN identifier and said PDN connection identifier, to a home PCRF so as to establish a second subsession of said S9 session, and associating said second subsession of said S9 session with said second gateway control session; a gateway at which said destination BBERF resides sending a proxy binding update message, which includes said user identifier, said PDN identifier and said PDN connection identifier, to a gateway at which a Policy and Charging Enforcement Function (PCEF) resides; after receiving the proxy binding update message, said PCEF sending an indication message of IP Connectivity Access Network (IP-CAN) session modification, which includes said user identifier, said PDN identifier and said PDN connection identifier, to said home PCRF so as to modify said Gx session; and after receiving said indication message of IP-CAN session modification, said home PCRF associating said Gx session with said second subsession of said S9 session according to said user identifier, said PDN identifier and said PDN connection identifier; wherein the method is able to implement policy and charging control for multiple PDN connections of the UE to one same Access Point Name (APN) in the roaming scenario with BBERF relocation.