Patent ID: 9407498
Filing Date: 2016-08-02
CPC Classification: H04L,H04W

Claim Text:
1. A non-transitory computer-readable storage medium having instructions which, when executed by a processor of a computing device, cause the computing device to implement a first packet data network gateway (PDN-GW) to operate in a PDN-GW pool that also includes a second PDN-GW and to provide UE session resilience for a user equipment (UE) session between a UE device and an external PDN that was previously serviced by the second PDN-GW after the second PDN-GW becomes non-operational by performing operations comprising: determining that the second PDN-GW has entered or is about to enter a non-operational state; activating a standby UE session, wherein the standby UE session comprises a synchronized copy of a UE session for which the second PDN-GW was acting as an active PDN-GW, the UE session being associated with the UE device and a network resource identifier (NRI) that identifies an Access Point Name (APN) slice which corresponds with a subset of internet protocol addresses in the external PDN; and transmitting a message to a serving gateway (SGW) providing data connectivity between the UE device and the PDN-GW pool, wherein the message indicates that the first PDN-GW has activated the standby UE session associated with the UE device serviced by the SGW to cause the SGW to direct traffic previously bound to the second PDN-GW to the first PDN-GW, whereby the UE session resilience is achieved by allowing the first PDN-GW to activate the standby UE session without notifying the UE device and without causing service interruption to the UE session.