Mobile Station Mobility Key Derivation and Route Optimization
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Solution Overview
Problem
Existing techniques for facilitating mobility in mobile stations are not efficient, particularly in situations where communication sessions need to be maintained across different networks, leading to suboptimal authentication and key management processes.
Innovation Solution
A mobility key is derived from a master key generated at an authentication server, which is used for authenticating mobility signaling in communication sessions, and a route optimization method is implemented to bypass the home agent, enhancing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional authentication and key management techniques are used for mobile station mobility, then security procedures can be established, but the process becomes inefficient and complex when mobile stations move between different communication networks
Solution Approach 1:
The patent segments the authentication and key management process into distinct phases: initial authentication phase (establishing master key) and mobility phase (deriving mobility keys). This segmentation allows efficient handling of mobility events by reusing the initial authentication results rather than repeating full authentication procedures.
Solution Approach 2:
The patent performs preliminary authentication and master key establishment before mobility events occur. The home authentication server pre-establishes the master key, which can then be quickly derived into mobility keys when needed, avoiding the complexity of real-time authentication during mobility events.
2Productivity
If home agent routing is used for mobile IP communication, then mobility support is provided, but communication routes are suboptimal and efficiency is reduced
Solution Approach 1:
The patent implements dynamic route optimization by allowing the mobile station to directly communicate with the home authentication server and correspondent nodes when possible, rather than forcing all traffic through the home agent. The system dynamically selects between home agent routing and direct routing based on current network conditions and mobility state.
3Productivity
If mobility keys are not readily available, then security may be maintained, but authentication processes become slower and less efficient
Solution Approach 1:
The patent changes the parameter of key derivation by introducing a deterministic algorithm that generates mobility keys from the master key using specific inputs (such as visitor network identifier and sequence numbers). This ensures that the same inputs always produce the same mobility key, providing both rapid generation and reliable reproduction of keys.
Data Source
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AI summary
Providing a mobility key for a communication session for a mobile station includes facilitating initiation of the communication session. A master key for the communication session is established, where the master key is generated at an authentication server in response to authenticating the mobile station. A mobility key is derived from the authentication key at an access node, where the mobility key is operable to authenticate mobility signaling for the communication session.