Interface Identifier Generation for Mobile Node Mobility
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Solution Overview
Problem
Current wireless communication systems face challenges in managing mobility for mobile nodes across different access technologies, leading to issues in maintaining consistent identifiers and session preservation during handoffs between networks.
Innovation Solution
The system employs multiple gateways that use keys and hash functions to generate technology-independent interface identifiers for mobile nodes, allowing consistent identification and session preservation across various access technologies, including statically and dynamically configured deployments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different access gateways use different access technologies to provide service to mobile nodes, then the system can support multiple access technologies and improve versatility, but the mobile nodes cannot receive consistent interface identifiers across different access technologies leading to session disruption
Solution Approach 1:
The patent implements a universal interface identifier generation mechanism that works across multiple access technologies (CDMA2000, GSM, UMTS, etc.). The access gateway generates interface identifiers using a standardized algorithm that produces consistent results regardless of which access technology is used, enabling the system to serve mobile nodes universally across different radio access networks while maintaining session continuity.
Solution Approach 2:
The patent changes the parameter generation approach by using standardized parameters (such as mobile node identity, access gateway identity, and sequence numbers) that remain consistent across different access technologies. By controlling and standardizing these input parameters to the interface identifier generation algorithm, the system ensures that the same mobile node receives the same interface identifier regardless of which access technology it uses, thereby maintaining session continuity during handoffs between different access networks.
2Ease of operation
If access gateways dynamically assign interface identifiers to mobile nodes, then the system can improve mobility management flexibility, but it becomes difficult to preserve sessions during handoffs between different access gateways
Solution Approach 1:
The patent implements a feedback mechanism where the access gateway generates interface identifiers using a deterministic algorithm that takes as input the mobile node's identity, the access gateway's identity, and a sequence number. This feedback loop ensures that when a mobile node hands off to a new access gateway, the new gateway can generate the same interface identifier by using the same algorithm and input parameters, thereby preserving session information and enabling seamless mobility management.
Solution Approach 2:
The patent applies preliminary action by pre-defining the interface identifier generation algorithm and its input parameters before handoff occurs. The access gateway prepares the interface identifier using standardized parameters (mobile node identity, gateway identity, sequence number) in advance, ensuring that when handoff occurs, the session information is already structured in a way that can be preserved and recognized by the target access gateway, eliminating session loss during mobility transitions.
Data Source
AI summary
A network system for communicating with mobile nodes has multiple gateways that can operate with each using a different access technology. In an IPv6 system, the access gateways each provide an interface identifier to the mobile nodes using the same one or more keys and hash so that different the same interface identifier regardless of the access technology used. The access gateways can have multiple options for using keys and/or hashes to provide an interface identifier such that the method for determining the interface identifier is configurable.