Dynamic IP Address Assignment for Visitor Network Integration
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Solution Overview
Problem
Current solutions fail to provide a mechanism for IP networks to dynamically select between mobility mechanisms and prefix delegation based on circumstances, limiting flexibility in connecting to host IP networks, especially in scenarios like vehicle or public transport networks where integration or isolation is required.
Innovation Solution
A method where a visitor router connects to a host router, transmitting an address request message with an identifier, and the host router determines the appropriate access method by checking a list of authorized identifiers, sending either an IP address or prefix delegation, allowing flexible access control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobility mechanisms are applied to a visitor network connecting to a host IP network, then the network can maintain connections and reachability while moving, but the network cannot benefit from the host network's addressing space and becomes isolated from local services
Solution Approach 1:
The patent implements dynamic selection between mobility mode and prefix delegation mode based on the visitor network's state. The system can switch between maintaining connections through home agent (mobility mechanism) and integrating with host network addressing (prefix delegation) depending on whether the network is mobile or stationary, resolving the contradiction between connection reliability and service accessibility
Solution Approach 2:
The patent changes the addressing parameter dynamically - using care-of-address with home agent for mobile networks, and prefix delegation for stationary networks. This parameter change allows the same network infrastructure to support both mobility requirements and local service integration by adjusting the addressing mode according to operational context
2Adaptability or versatility
If prefix delegation is assigned to a visitor network, then the network can access host network services with consistent addressing, but the host network loses control over address assignment and security
Solution Approach 1:
The patent implements feedback mechanisms where the host network router receives information about the visitor network's identity and mobility state, then decides whether to grant prefix delegation or assign care-of-address. This feedback loop maintains control over address management while enabling integration when appropriate, resolving the contradiction between service accessibility and control
3Adaptability or versatility
If a host network always assigns prefix delegation to visitor networks, then all networks can integrate seamlessly, but mobile networks cannot maintain connections while moving between different host networks
Solution Approach 1:
The patent makes the addressing mechanism dynamic rather than static - networks can transition between prefix delegation mode (for stationary integration) and mobility mode with home agent (for connection continuity during movement). This dynamic adaptation resolves the contradiction by allowing the system to select the appropriate mechanism based on real-time mobility conditions
Data Source
AI summary
To enable a visitor network to access a host network, a method includes steps in which a router of a visitor network connects to a router of a host network and transmits to it an address request message containing an identifier of the visitor router. The host router extracts, from the address request message received, the identifier of the visitor router, and transmits, to the visitor router, an address assignment message containing either an address or an address prefix of the host network, depending on the identifier of the visitor router extracted from the address request message.