US Patent No. 9,603,183

METHOD AND SYSTEM FOR KEEPING SINGLE RADIO VOICE CALL CONTINUITY SESSION ALIVE


Patent No. 9,603,183
Issue Date March 21, 2017
Title Method And System For Keeping Single Radio Voice Call Continuity Session Alive
Inventorship Zhenhua Xie, Shenzhen (CN)
Assignee ZTE Corporation, (CN)

Claim of US Patent No. 9,603,183

1. A method for keeping a single radio voice call continuity session alive comprising:
during switching of a terminal from a packet switch domain to a circuit switch domain, an application layer gateway establishing
a new signaling connection with an enhanced mobile switch center after receiving a first transfer request from the enhanced
mobile switch center, sending a response message of the first transfer request to the enhanced mobile switch center after
establishing the new signaling connection, and notifying, by the application layer gateway, a service centralization and continuity
application server (SCC AS) to establish a new signaling connection with the application layer gateway, and the SCC AS establishing
a new signaling connection besides an original signaling connection with the application layer gateway according to the notification
from the application layer gateway.