Session Border Controller SIP Handover
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Solution Overview
Problem
Current session mobility techniques in telecommunications networks, such as SIP and mobile IP, face issues with privacy concerns and lack seamless continuity during handovers between different network access points, resulting in slow session handovers and increased signaling messages.
Innovation Solution
A method using a session border controller (SBC) to intercept and redirect SIP signaling messages, ensuring seamless handovers of media streams between terminals and network access points without revealing the terminal's movement to the other party, maintaining privacy and improving handover speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SIP re-invite message is used for session mobility, then session can be transferred between network access points, but the user agent server can observe that the user agent client is in motion, compromising privacy
Solution Approach 1:
A session border controller (SBC) is introduced as an intermediary between the user agent client and user agent server. The SBC intercepts the re-invite message, determines that it relates to session mobility, and initiates a session hand-over while redirecting the media stream to a new network access point. This intermediary hides the mobility information from the user agent server, resolving the privacy issue while maintaining session mobility capability.
2Adaptability or versatility
If mobile IP technology is used for session hand-over, then session can be transferred between networks, but the hand-over is slow and lacks seamless continuity
Solution Approach 1:
The session border controller performs preliminary actions by intercepting the re-invite message before the traditional mobile IP hand-over process begins. By determining the message relates to session mobility and initiating the hand-over process early, the SBC enables faster session transfer with seamless continuity, avoiding the slow hand-over characteristic of traditional mobile IP technology.
3Adaptability or versatility
If traditional SIP mobility mechanisms are used, then session can be redirected, but additional signaling messages and packet overhead are generated
Solution Approach 1:
The session border controller extracts and handles the mobility-related functionality from the standard SIP signaling flow. By intercepting the re-invite message and determining it relates to session mobility, the SBC manages the hand-over process centrally, reducing the need for additional signaling messages between the user agent client and server while maintaining session redirection capability.
Data Source
AI summary
The invention concerns a method of providing session mobility to an IP based real-time session in a telecommunications network whereby the telecommunications network uses the session initiation protocol for the setup and control of the session. The session comprises a media stream between a first terminal associated to a first network access point of the telecommunications network and a second terminal associated to a second network access point of the telecommunications network. A re-invite session initiation protocol signalling message related to session mobility of said session is intercepted at a session-related session border controller of the telecommunications network. Said session border controller initiates a corresponding session hand-over of said session. In said session hand-over, the media stream of said session is redirected to a new network access point of the first terminal and/or a new terminal.