IMS Session Continuity via Complimentary Private User Identity
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Solution Overview
Problem
IMS sessions are disrupted when User Equipment (UE) moves across communication networks due to changes in IP addresses, causing interruptions in services like active calls, instant messaging, and video-streaming.
Innovation Solution
Generating a complimentary private user identity (CPI) associated with a public user identity, allowing seamless registration across multiple communication networks by using a new IP address, ensuring continuous IMS sessions without disrupting ongoing sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE re-registers with the network using a new IP address when traversing across communication networks, then the UE can obtain network connectivity in the new network, but the ongoing IMS sessions are disrupted
Solution Approach 1:
The patent applies preliminary action by generating a complimentary private user identity (CPI) in advance before the UE traverses to a new network. The CPI is pre-configured and associated with the public user identity, allowing the UE to maintain session continuity without disruption during network transitions. This pre-prepared identity enables seamless re-registration while preserving ongoing sessions.
2Ease of operation
If the network creates a binding of the public user identity to the UE's IP address, then the network can forward SIP messages to the user's UE, but the binding becomes invalid when the IP address changes
Solution Approach 1:
The patent applies copying by creating a complimentary private user identity (CPI) that serves as a duplicate or alternative identity to the original private user identity. When the UE's IP address changes, the network can use the CPI associated with the same public user identity to maintain the binding relationship, effectively copying the identity functionality to preserve message routing without requiring a new binding creation.
3Device complexity
If the UE uses the same private user identity for re-registration, then the registration process is simple, but the older binding is removed and sessions are disrupted
Solution Approach 1:
The patent applies segmentation by dividing the private user identity into two distinct identities: the original private user identity and a complimentary private user identity (CPI). The CPI is specifically designed for use during network transitions, while the original identity maintains existing bindings. This segmentation allows the UE to perform simple re-registration using the CPI without affecting the bindings associated with the original identity, thus maintaining session continuity.
Data Source
AI summary
A method and system for providing IP Multimedia Subsystem (IMS) session continuity to a User Equipment (UE) across a plurality of communication networks is provided. The UE traverses from a first communication network to a second communication network. A public user identity associated with a private user identity of the UE is registered with the first communication network by using a first address. The method includes generating (404) a complimentary private user identity associated with the public user identity. The method also includes obtaining (406) a second address from the second communication network when the UE traverses from the first communication network to the second communication network. Moreover, the method includes registering (408) the public user identity associated with the complimentary private user identity with the first communication network by using the second address.