User Equipment Capability Update via SIP Register
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Solution Overview
Problem
In IMS networks, there is a lack of efficient methods to inform the network of changes in user equipment capabilities, leading to unnecessary message renegotiations and increased intercommunication time during session establishment.
Innovation Solution
A method where user equipment initiates a re-register process with updated capability information, using an existing register flow to inform the network of capability changes, thereby avoiding additional message renegotiations and optimizing session establishment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network waits for session establishment to negotiate capability changes, then capability information can be updated, but additional message renegotiations increase intercommunication time
Solution Approach 1:
The patent applies preliminary action by having the user equipment send capability change information to the network before session establishment occurs. When the user equipment's capability changes (e.g., audio capability, video capability), it proactively notifies the network through a SIP REGISTER message or other signaling, so that the network stores the updated capability information in advance. This eliminates the need for additional capability renegotiation during session establishment, directly reducing session setup time while ensuring accurate capability information is available.
2Loss of information
If traditional session renegotiation is used to update capability information, then capability changes are communicated, but network load increases due to additional messages
Solution Approach 1:
The patent extracts the capability change notification function from the session establishment process. Instead of embedding capability updates within session negotiation messages (which would increase message count and network load), the system separates this function by using independent signaling mechanisms (such as SIP REGISTER messages with capability information in the Contact header or custom information elements). This allows capability information to be updated and stored by the network without triggering full session renegotiation, reducing network load while ensuring capability changes are properly communicated.
Data Source
AI summary
A method of informing a network of a change of user equipment capability includes: stopping a registration timer on the user side set currently when the user equipment capability changes; sending a register request message carrying information of new user equipment capability to the network; analyzing, by the network, the register request message, and storing the information of new user equipment capability for reference by subsequent establishment of a session; stopping a current registration timer on the server side set for the user equipment; initiating a new registration timer on the server side for the user equipment; sending a response message carrying information of the new registration timer on the server side to the user equipment; resetting the registration timer on the user side based on information of the new registration timer on the server side in the response message. The capability change is informed to the network in time.