IoT VoLTE IMS Registration Timer Mechanism
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Solution Overview
Problem
Current network standards, such as the GSMA Official Document NG.108, inefficiently manage VoLTE calls from IoT devices due to requirements that lead to excessive resource usage in LTE networks, as they are based on specifications for frequent VoLTE calls, not infrequent ones, and do not account for IoT devices' unique data transmission needs.
Innovation Solution
Implementing a method where User Equipment (UE) initiates a timer after a VoLTE call, de-registering from the IMS if no new call is made within a predefined time, and re-registering only when a VoLTE call is initiated, thereby reducing unnecessary IMS registrations and network overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current network standards (GSMA NG.108) are used for IoT devices making VoLTE calls, then devices can make voice calls via modem, but resource usage in LTE networks becomes excessive due to frequent IMS registrations
Solution Approach 1:
The system dynamically adjusts IMS registration behavior based on device type and call frequency. IoT devices using 4G CAT-M1 modems are identified and configured with extended registration intervals, allowing the network to adapt registration dynamics to the specific usage patterns of low-bandwidth devices rather than applying uniform registration requirements to all VoLTE devices.
Solution Approach 2:
The invention changes the registration time parameter for specific device categories. By modifying the registration interval from standard values to extended intervals (e.g., 24 hours or longer) for IoT devices, the system reduces the frequency of registration messages while maintaining adequate network presence tracking, thereby reducing overall network resource consumption.
2Reliability
If standard IMS registration procedures are used for all VoLTE devices, then voice call functionality is maintained, but network bandwidth overhead increases due to excessive registration messages
Solution Approach 1:
Different registration strategies are applied to different device types within the network. Standard smartphones continue to use frequent registration intervals for reliable real-time communication, while IoT devices with infrequent call patterns use extended registration intervals. This local differentiation allows the network to optimize bandwidth usage for each device category while maintaining appropriate service reliability.
Solution Approach 2:
The system applies a more conservative (excessive) registration approach than strictly necessary for IoT devices. By using extended registration intervals longer than the minimum required for reliability, the system ensures that even with reduced registration frequency, devices remain adequately tracked for incoming calls while significantly reducing overall signaling overhead.
3Adaptability or versatility
If IoT devices register with IMS continuously, then VoLTE call capability is maintained, but the number of logical IMS registrations becomes unmanageably large
Solution Approach 1:
The network performs preliminary identification of IoT devices during initial attachment or first call setup. By recognizing devices using 4G CAT-M1 modems or other low-bandwidth modem types early in the connection process, the network can pre-configure extended registration intervals before any actual calls occur, preventing the accumulation of excessive registration states from the outset.
Data Source
AI summary
A method of managing registration of a User Equipment (UE) with an IP Multimedia Subsystem (IMS) via a Long-Term Evolution (LTE) network. The method comprises, following termination of a Voice over LTE (VoLTE) call, initiating a timer at the UE and, if no VoLTE call is initiated to or from the UE prior to expiry of the timer, then sending an IMS de-registration request from the UE to the IMS.