IMS UE Redirection via Unique Identity for Shared PUI
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Solution Overview
Problem
Current redirection services in the IMS domain fail to uniquely locate and redirect session initial requests to a configured UE when multiple UEs share a Public User Identity (PUI), leading to inability to designate a specific UE for service configuration.
Innovation Solution
Incorporating a unique identity, such as a Globally Routable User Agent Uniform Resource Identifier (GRUU), registration address, or personal mobile device identifier, into the redirected initial request message to enable the Serving Call Session Control Function (S-CSCF) to uniquely locate the configured UE associated with a shared PUI, and modifying the request Uniform Resource Identifier (URI) to ensure accurate routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PUI is shared by multiple UEs, then the PUI can be used for multiple devices, but the S-CSCF cannot uniquely locate a specific configured UE
Solution Approach 1:
The patent segments the identification process by introducing a unique identity (such as GRUU, registration address, or device identifier) that is specific to each UE, while maintaining the shared PUI at the higher level. This segmentation allows the system to first identify the shared PUI and then uniquely identify the specific UE within that group, resolving the contradiction between PUI sharing and unique location capability.
2Device complexity
If only PUI is used in redirected initial request message, then the message format remains simple, but the configured UE cannot be uniquely identified
Solution Approach 1:
The patent introduces an intermediary unique identity element that acts as a mediator between the shared PUI and the specific UE identification. This intermediary identity (GRUU, registration address, or device identifier) is embedded in the redirected initial request message, enabling reliable UE identification without significantly increasing message format complexity, as it leverages existing identity mechanisms in the IMS domain.
Data Source
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AI summary
The present invention discloses a method for implementing a redirection service for UEs sharing a PUI in an IMS, comprising: when a UE in a PN registers at a PNM AS, the PNM AS fetching the UE Identity and establishing a corresponding relationship between the identity and the PUI; when determining to route an initial request message of a terminating call of a UE in the PN routed by an original S-CSCF to a configured UE sharing the PUI, the PNM AS adding the configured UE Identity into a redirected initial request message and sending it to the original S-CSCF which forwards the message to a redirection S-CSCF; and the redirection S-CSCF uniquely locating the configured UE according to the identity or both the identity and the PUI in the message. The present invention can redirect a session initial request to a configured UE sharing a PUI with other UEs.