IMS Emergency Registration Expiration Time Policy Adaptation
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Solution Overview
Problem
The existing IMS emergency call registration method sets uniform registration expiration times based on home network policies, failing to consider the specific requirements of visited networks, leading to inconsistent emergency call service characteristics and management complexities due to differing regulatory requirements across visited networks.
Innovation Solution
The method involves the P-CSCF and S-CSCF setting emergency registration expiration times according to the emergency registration expiration time setting policy of the visited network, which considers factors like the type of emergency call and location information, ensuring compliance with visited network regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the S-CSCF sets the emergency registration expiration time according to home network policy, then the home network's registration management is simplified, but the visited network's specific regulatory requirements cannot be met
Solution Approach 1:
The patent segments the registration expiration time setting function by introducing a new parameter 'registration expiration time setting mode' that can be set to either 'home network policy' or 'visited network policy'. This allows the system to switch between different management modes, enabling the S-CSCF to adapt to different visited network requirements while maintaining home network control when needed.
Solution Approach 2:
The patent makes the registration expiration time setting dynamic by introducing the 'registration expiration time setting mode' parameter that can be changed based on the specific scenario. The system can dynamically switch between home network policy-based and visited network policy-based settings, allowing flexible adaptation to different regulatory environments without fixed constraints.
2Device complexity
If uniform registration expiration times are used across all users, then the home network policy implementation is simplified, but inconsistent emergency call service characteristics arise in different visited networks
Solution Approach 1:
The patent applies local quality by allowing different registration expiration times for different users based on their specific situations. The 'registration expiration time setting mode' can be set individually for each user or group, enabling local customization of registration times to meet specific visited network requirements while maintaining overall system management.
Solution Approach 2:
The patent changes the registration expiration time parameter from a fixed uniform value to a flexible parameter that can be adjusted based on the 'registration expiration time setting mode'. This allows the system to modify the expiration time parameter according to different visited network policies, ensuring service consistency across different networks while maintaining manageable complexity.
3Productivity
If the P-CSCF forwards the emergency registration request without processing the registration expiration time, then the request forwarding is simplified, but the visited network's specific time requirements are not considered
Solution Approach 1:
The patent applies preliminary action by having the P-CSCF process and set the registration expiration time in advance before forwarding the emergency registration request to the S-CSCF. The P-CSCF retrieves the expiration time from the visited network's policy database and includes it in the request, ensuring that visited network requirements are considered upfront rather than requiring complex processing during forwarding.
Data Source
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AI summary
A realizing method of emergency registration is disclosed. When the user equipment in the visited network initiates an emergency registration request, the method comprises the following steps: after P-CSCF of the visited network receives the emergency registration request sent from the user equipment, it forwards the message to S-CSCF of the home network. The S-CSCF sets the emergency registration expiration time according to the setting policy for emergency registration expiration time, includes it into the emergency registration response sent to the P-CSCF which retrieves the emergency registration expiration time from the emergency registration response and sends the message to the user equipment, which in turn retrieves the emergency registration expiration time from the emergency registration response. The factors of the setting policy for the emergency registration expiration time comprise: a type of the emergency call, the location information of the visited network and the location information of the user equipment.