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1. (WO2018122615) S9 ROAMING SESSION CLEANUP WITH S9 CONNECTION FAILURE

Pub. No.:    WO/2018/122615    International Application No.:    PCT/IB2017/001760
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 29 00:59:59 CET 2017
IPC: H04L 12/14
H04M 15/00
H04W 4/24
Applicants: ALCATEL LUCENT
Inventors: MA, Haiqing
DING, Zhaoliang
Title: S9 ROAMING SESSION CLEANUP WITH S9 CONNECTION FAILURE
Abstract:
Various embodiments relate to a method performed by a network node for terminating an S9 roaming session, the method including: receiving a Gx roaming session termination request; forwarding a corresponding S9 roaming session termination request to a controlling Policy and Charging Rule Function (PCRF) node; waiting a preconfigured time interval; and terminating the S9 roaming session without receiving an expected S9 acknowledgement message from the controlling PCRF node. Embodiments can include scheduling an IPCAN session audit for a selected IPCAN session of an S9 roaming session at preconfigured time intervals; generating an IPCAN session status request message; converting the IPCAN session status request message to a corresponding S9 status request message; forwarding the S9 status request message to a visited PCRF node; and responsive to receiving an S9 message indicating an unknown session from the visited PCRF node, removing the selected IPCAN session at the network node.