Session Identifier-Based Handover Between Packet and Circuit Switched Networks
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Solution Overview
Problem
Wireless devices face challenges in seamlessly transitioning sessions between different wireless communication networks, particularly when moving from packet switched networks that support multiple concurrent sessions to circuit switched or limited packet switched networks that only handle one session at a time, requiring efficient handover mechanisms to maintain continuous communication.
Innovation Solution
Assigning unique session identifiers for each session between a wireless device and a correspondent node, allowing for specific sessions to be designated for handover, using protocols like SIP and VCC servers to manage the transition, and employing session-based VDNs to distinguish and manage individual sessions during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless device transitions from a packet switched network supporting multiple concurrent sessions to a circuit switched network handling only one session at a time, then the device can maintain communication in the target network, but it loses the ability to handle multiple concurrent sessions
Solution Approach 1:
The patent segments the session management by assigning unique session identifiers to distinguish individual sessions within the packet switched domain. This allows the network to identify and prioritize specific sessions for handover, enabling selective transition of particular sessions while maintaining others in the packet switched network, thus preserving multi-session capability during transition
Solution Approach 2:
The patent performs preliminary session identification and prioritization before the actual handover occurs. By pre-assigning session identifiers and determining which sessions should be handed over, the system prepares the transition in advance, ensuring seamless continuity when moving from packet switched to circuit switched networks
2Reliability
If the system assigns unique session identifiers and implements session-based handover management, then seamless handover between networks is achieved, but the system complexity increases
Solution Approach 1:
The patent employs the Session Initiation Protocol (SIP), a universal protocol already widely used in packet switched networks, to manage session identification and handover. This multi-functional protocol handles both session establishment and session identification for handover, reducing the need for separate complex management systems while achieving seamless handover
3Adaptability or versatility
If multiple concurrent sessions are maintained in a packet switched network, then communication flexibility is improved, but the difficulty of managing handover to a single-session network increases
Solution Approach 1:
The patent applies local quality by assigning unique session identifiers to specific sessions rather than treating all sessions uniformly. This allows the system to differentiate between sessions based on their identification characteristics, enabling precise selection of which sessions to hand over to the circuit switched network while maintaining others in the packet switched domain
Data Source
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AI summary
A system and a method for handing over a session from a packet switched network to another network, comprising a wireless device having a plurality of sessions with the corresponding system node in the packet switched network, wherein each session is assigned a unique session identifier used to identify which one of the plurality of sessions is handed over to the other network.