Patent ID: 9055546
Filing Date: 2015-06-09
Classification: H04L,H04W

Abstract:
1. A method for providing service continuity with respect to a registration of a mobile terminal (UE), at a control server of an IP Multimedia Subsystem (IMS) network, while a Circuit-Switched (CS) communication session between the UE and a switching server (MSC) of a CS network is established, the method comprising: initiating a termination of the registration of the UE at the IMS network in response to expiration of a registration timer at the control server; delaying, by the control server, expiration of the registration timer at the control server by updating the registration timer, based on control information received from the MSC when the registration timer is close to expiration; wherein the MSC initiates the update of the registration timer in the control server by: wherein the control server, after updating the registration timer, sends a notification message to a serving node of the IMS network to trigger an update of an additional registration timer in the serving node.