Study on IMS Disaster Prevention and Restoration Enhancement
The present document identifies IMS restoration mechanisms as specified in 3GPP TS 23.380 [2] and studies potential optimization solutions. The document will focus on the following aspects:
- Create/enhance corresponding the restoration mechanism to support the normal use of voice, video and SMS services in the IMS network. Specifically, it adopts the context data of registered online users stored by HSS/UDM, S-CSCF, P-CSCF and MMTEL to bypass the involved faulty network functions or links. That supports the following procedures:
- Re-registration procedure for registered online users;
- Mobile terminated procedure for registered online users;
- EPS fallback procedure for registered online users;
- Initial registration procedure for registered online users after deregistration.
- Create/enhance corresponding network disaster-prevention mechanisms, including:
- UE specific registration analysis mechanism, to prevent registration with missing parameter or incorrect parameters repeatedly.