US Patent No. 9,351,329


Patent No. 9,351,329
Issue Date May 24, 2016
Title Session Continuity For Packet Data Network Gateways
Inventorship Alex Shusterman, Vienna, VA (US)
Bharatwajan Raman, Arlington, VA (US)
Assignee Sprint Communications Company L.P., Overland Park, KS (US)

Claim of US Patent No. 9,351,329

1. A method of operating a Packet Data Network Gateway (P-GW) to maintain session continuity for User Equipment in a Long
Term Evolution (LTE) network, the method comprising:
receiving and processing a first session setup message for the User Equipment to determine if the User Equipment qualifies
for alternate P-GW access;

if the User Equipment qualifies for the alternate P-GW access, then generating a second session setup message indicating a
primary P-GW Identifier (ID), a primary P-GW Tunnel Endpoint ID (TEID), an alternate P-GW ID, and an alternate P-GW TEID;

transferring the second session setup message for delivery to a Service Gateway (S-GW) in the LTE network, wherein the S-GW
automatically uses the alternate P-GW ID and the alternate P-GW TEID if performance of the primary P-GW ID and the primary
P-GW TEID falls below a threshold.