IMS GRUU Validation via S-CSCF Segmentation
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Solution Overview
Problem
IMS networks face challenges in validating Globally-Routable User Agent Uniform Resource Identifiers (GRUU) effectively, which are crucial for distinguishing between users sharing the same public user identity and ensuring accurate message routing.
Innovation Solution
The method involves an S-CSCF and P-CSCF with validating units that determine the generating manner of the GRUU, validating it against stored validity information, and replacing or adding public user identities as necessary to ensure valid GRUU usage, thereby facilitating accurate service processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple users share the same public user identity, then user registration and service provision can be simplified, but message routing accuracy and user distinction become problematic
Solution Approach 1:
The patent segments the public user identity into two parts: the public user identity itself and the GRUU (Globally Routable User Agent URI). The GRUU acts as a unique identifier within the same public user identity group, allowing the system to distinguish between multiple users sharing the same public identity while maintaining the simplicity of public user identity registration.
Solution Approach 2:
The GRUU serves as an intermediary element between the public user identity and the actual user routing. It is introduced as an additional identifier that mediates the routing process, enabling accurate message delivery to the correct user while preserving the simplified public user identity registration mechanism.
2Reliability
If GRUU validation is implemented to ensure accurate routing, then message delivery reliability improves, but network complexity and processing overhead increase
Solution Approach 1:
The patent implements preliminary validation of the GRUU format and structure before routing messages. The validation checks whether the GRUU follows the correct URI syntax and contains the necessary components (user agent part, domain name). This preliminary action prevents routing errors and ensures reliability while keeping the validation logic centralized and manageable.
Solution Approach 2:
The system incorporates feedback mechanisms where the S-CSCF (Serving CSCF) validates the GRUU and provides feedback to the P-CSCF (Proxy CSCF) and other network elements. This feedback loop ensures that only valid GRUUs are processed further, maintaining routing accuracy while allowing for centralized validation management.
3Manufacturing precision
If the IMS network validates GRUU against stored validity information, then service processing accuracy improves, but system response time increases
Solution Approach 1:
The patent applies partial validation by checking only the essential aspects of the GRUU (format correctness, presence of required components) rather than performing comprehensive validation. This partial action approach maintains sufficient service processing accuracy while significantly reducing the validation processing time and system response delay.
Data Source
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AI summary
A method for checking the validity for globally-routable user agent uniform resource identifier (GRUU) includes the following steps. A serving-call session control function entity (S-CSCF) receives a service request or a service response containing a GRUU to an IMS network side. The S-CSCF validates the GRUU. Furthermore, an apparatus and a system for checking validity of the GRUU are further provided. The method, apparatus, and system of the present invention solve the problem about how the IMS network side checks the validity of the GRUU which is not defined in the prior art.