Patent ID: 9055081
Filing Date: 2015-06-09
Classification: H04L,H04W

Abstract:
1. A method in a first packet data network gateway (PDN-GW) in a PDN-GW pool of a plurality of PDN-GWs providing data connectivity between user equipment (UE) devices and an external PDN, wherein the first PDN-GW is communicatively coupled to a second PDN-GW in the PDN-GW pool, the method for providing UE session resilience by allowing the first PDN-GW to provide connectivity for a UE session previously serviced by the second PDN-GW after the second PDN-GW becomes non-operational, the method comprising: receiving, from the second PDN-GW, a Create Session Request message for the UE session, wherein the second PDN-GW received another Create Session Request message for the UE session from a Serving Gateway (SGW), and wherein the second PDN-GW is to become the active PDN-GW for the UE session; transmitting, to the SGW, a Create Session Response message indicating that the first PDN-GW will be a standby PDN-GW for the UE session and further indicating an Internet Protocol (IP) address of the first PDN-GW; receiving, from the second PDN-GW, session information of the UE session; and responsive to detecting that the second PDN-GW has entered or is about to enter into a non-operational state, switching to become the active PDN-GW for the UE session.