Search International and National Patent Collections

1. (WO2018104579) METHOD AND APPARATUS FOR MAINTAINING SERVICE CONTINUITY DURING INTER-RAT MOBILITY UTILIZING CONTEXT TRANSFER

Pub. No.:    WO/2018/104579    International Application No.:    PCT/FI2017/050835
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Wed Nov 29 00:59:59 CET 2017
IPC: H04W 36/14
H04W 36/38
H04W 76/12
Applicants: NOKIA TECHNOLOGIES OY
Inventors: WON, Sung
CHANDRAMOULI, Devaki
CHIBA, Tsunehiko
Title: METHOD AND APPARATUS FOR MAINTAINING SERVICE CONTINUITY DURING INTER-RAT MOBILITY UTILIZING CONTEXT TRANSFER
Abstract:
Various methods are provided for allowing PDU sessions in a source system to be maintained in a target system by transferring UE context during a system change. One example method may comprise receiving, at a target core entity, during a system change, a user equipment context, the target core entity being one of an MME and a NG CCF-SM, the system changes being one of a handover from EPS to NGS or a handover from NGS to EPS, transmitting a handover request to a target core network node, transmitting a request to establish forwarding tunnels, transmitting a message commanding handover, the message comprising tunneling information, and receiving a handover confirm message.