Mobile Terminal Handover via Application Layer Protocol
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Solution Overview
Problem
Current mobile terminal and network devices require modification of lower layer data transmission mechanisms for handover information exchange, limiting seamless communication across networks and increasing costs.
Innovation Solution
Implementing a mobile terminal and network device that transceive handover information using an application layer protocol, such as Session Initiation Protocol (SIP), to eliminate the need for modifying lower layer data transmission mechanisms, enabling seamless handover without modifying existing network infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If handover information is exchanged using a lower layer protocol (MAC protocol), then handover information can be transmitted, but modification of data transmission mechanism is required for each network
Solution Approach 1:
The patent introduces an application layer as an intermediary between the handover function and lower layer protocols. Handover information is encapsulated in application layer messages (SIP SUBSCRIBE, NOTIFY, PUBLISH) that traverse existing lower layer protocols without modification, eliminating the need to change MAC protocols for each network while maintaining handover capability
Solution Approach 2:
The patent shifts handover information exchange from the data link layer (MAC layer) to the application layer, adding a new dimensional approach. This dimensional change allows handover information to be carried as application layer data without affecting lower layer protocols, resolving the contradiction between adaptability and complexity
2Adaptability or versatility
If Media Independent Handover (MIH) mechanism is used, then handover events and commands can be exchanged, but detailed application layer message exchange mechanism is not provided
Solution Approach 1:
The patent copies the successful application layer messaging patterns from existing SIP services (event subscription, presence publishing) and applies them to handover information exchange. This provides a proven, easy-to-operate message exchange mechanism at the application layer that mirrors MIH functionality without requiring new protocol development
3Reliability
If lower layer protocol modification is implemented for handover, then handover information can be transmitted, but network infrastructure modification and increased costs occur
Solution Approach 1:
By positioning handover information exchange at the application layer, the patent creates an intermediary that isolates handover functionality from lower layer infrastructure. This allows reliable handover information transmission without modifying network infrastructure, as application layer messages can be carried over existing unmodified lower layer protocols
Solution Approach 2:
The patent makes the application layer message exchange mechanism universal by using standard SIP protocols that can carry handover information across different network types without requiring network-specific modifications. This universal approach maintains reliability while eliminating infrastructure modification costs
Data Source
AI summary
A mobile terminal and a network device for providing a handover service are provided. A mobile terminal includes a transmission unit to transmit a request message for handover information to a network device, and a receiving unit to receive a response message including the handover information from the network device, wherein the request message and the response message are transceived by an application layer protocol.