Uninterruptible IMS: maintaining the registration and call services during signaling storm in IP multimedia subsystem

For 4G/5G voice services, rapid restoration of IP Multimedia Subsystem (IMS) voice services during signaling storm is fundamental to ensuring stable operation and improving the user experience of 4G/5G networks. However, IMS solutions for recovering from signaling storm are still inadequate for real-wild networks. This is evidenced by the recovery time from global network outages caused by signaling storm in recent years. Therefore, we propose an IMS Disaster Restoration Enhancement (IMS-DRE) mechanism using a called restoration-application server to effectively and quickly recover the IMS registration and call services at a low cost. Based on China Telecom's real-wild data of the network, experimental results show that the proposed mechanism was resistant to signaling storm and superior to existing recovery approaches.