SIP Server Handoff System for Seamless Device Transitions
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Solution Overview
Problem
Current handoff systems between different devices require user input of session information and direct involvement of a crossover node, limiting seamless transitions and user accessibility, especially when devices with varying capabilities are involved.
Innovation Solution
A SIP-based handoff system that includes a SIP server capable of updating routing paths and involving target devices in current sessions, allowing for seamless handoffs without user intervention and enabling intentional data delays through the 'pause' option.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If user inputs session information and crossover node directly participates in handoff, then handoff can be performed between devices, but user accessibility is limited and seamless transition cannot be achieved
Solution Approach 1:
The patent introduces a SIP server as an intermediary that mediates the handoff process between devices. The SIP server receives handoff requests, manages session information, and coordinates the transition without requiring direct user intervention or crossover node involvement. This resolves the contradiction by improving ease of operation through automated mediation while maintaining reliable seamless handoff through centralized session management.
Solution Approach 2:
The system enables devices to perform self-service handoffs by automatically managing session transitions through the SIP server. The source device initiates the handoff request and the target device automatically joins the session without requiring manual user input of session information. This improves ease of operation while ensuring reliable handoff through automated session management.
2Adaptability or versatility
If crossover node adds session connection for handoff, then handoff function is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the complex session management functionality from individual devices and concentrates it in the SIP server. The SIP server handles all session connection additions, modifications, and terminations centrally, removing the need for each device to implement complex session changing functions. This maintains versatile handoff capability while reducing device complexity by externalizing the complex management logic.
Solution Approach 2:
The SIP server provides universal session management capabilities that serve multiple devices and handoff scenarios. Instead of each device implementing its own session management, the SIP server offers a universal interface for all session operations. This enables handoff functionality across different device types without increasing individual device complexity, as the SIP server handles the multi-functional session management centrally.
3Reliability
If user must know session ID to request handoff, then security is maintained, but ease of operation deteriorates
Solution Approach 1:
The system implements self-service authentication where devices automatically present their credentials to the SIP server, which then retrieves the necessary session information. Users don't need to manually input session IDs because the SIP server automatically manages the authentication and session retrieval process. This maintains security through automated credential verification while dramatically improving ease of operation by eliminating manual session ID entry.
Solution Approach 2:
The SIP server performs preliminary actions by pre-establishing device credentials and session information in its database before handoff is needed. When a handoff request is made, the SIP server already has the necessary session information ready to be retrieved and processed. This preliminary preparation maintains security through pre-verified credentials while improving ease of operation by eliminating the need for users to know session IDs in advance.
Data Source
AI summary
A handoff system and method between different kinds of devices, an SIP server and an application method of the SIP server applied thereto. The handoff system between different kinds of devices includes a plurality of devices; a SIP server which requests a routing path update when a handoff request signal is input from a source device among the plurality devices, and getting a target device to participate in a current session; and a gateway which updates a predetermined routing path when a request signal for the routing path update is input, and transmitting data to the source device and the target device via the updated routing path.