Proxy Mobile IP Mobility Management for Wireless Handoffs
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Solution Overview
Problem
Conventional Mobile IP methods, such as MIPv4 and MIPv6, are unsuitable for Ultra Mobile Broadband (UMB) and incur time delays due to security processes and database management when an Access Terminal (AT) moves within or between different wireless access technologies, necessitating a more efficient mobility management scheme.
Innovation Solution
A method and system utilizing Proxy Mobile Internet Protocol (PMIP) and an Authentication, Authorization, and Accounting (AAA) server for efficient mobility management and secure communication, including handoff processes between 3GPP2 UMB and other wireless access technologies, employing protocols like EAP and RADIUS or Diameter for authentication and mobility management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Mobile IP methods (MIPv4/MIPv6) are used for mobility management, then mobility support is provided, but time delays occur due to security processes and database management
Solution Approach 1:
The patent introduces a Proxy Mobile IP (PMIP) mechanism where the network entity (Proxy Mobile IP entity) acts as an intermediary to perform mobility management functions on behalf of the Access Terminal. This mediator handles binding updates, authentication, and session management between the terminal and network, eliminating the need for the terminal to directly participate in complex Mobile IP security processes and database operations, thus reducing call setup delay while maintaining mobility support
Solution Approach 2:
The patent extracts the complex security processes and database management operations from the terminal device and relocates them to network-side entities. By separating these time-consuming functions from the terminal, the system maintains mobility support while significantly reducing the terminal's processing burden and call setup time
2Loss of time
If Proxy Mobile IP is implemented for efficient mobility management, then call setup delay is reduced, but system complexity increases due to additional network entities and protocols
Solution Approach 1:
The patent designs the Proxy Mobile IP entity to perform multiple functions including mobility management, authentication, and session handling within a single network entity. This multi-functional approach consolidates what would otherwise require multiple separate components, reducing system complexity while achieving efficient mobility management and reduced call setup delay
3Reliability
If Mobile IP security processes are performed for each handoff, then communication security is maintained, but processing time increases
Solution Approach 1:
The patent implements preliminary authentication and security setup during initial network attachment, establishing security contexts and authentication credentials in advance. When handoffs occur, the pre-established security mechanisms are reused or quickly updated, eliminating the need to perform complete security processes from scratch during each handoff, thus maintaining communication security while reducing handoff processing time
Data Source
AI summary
A system is provided for managing mobility of an Access Terminal (AT) in a Proxy Mobile Internet Protocol (PMIP) communication system. As the AT performs a handoff, a target Signaling Radio Network Controller (SRNC) delivers session information of the AT, acquired from a source SRNC of a source network, to a target Access Network (AN). An Authentication, Authorization and Accounting server (AAA) performs an AT access authentication process. Then, a target Access Gateway (AGW) performs a proxy registration procedure, with the target AN, and receives, from the AT, a message indicating a need to establish an interface with the HA. A Home Agent (HA) performs mobility management for the AT, receives a message for requesting proxy registration for mobility management for the AT, sends an access request message to the AAA, receives an access accept message, and sends a response message for proxy registration to the target AGW.