CPE Router Proxy Home Agent for Mobile IP Prefix Management
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Solution Overview
Problem
Existing Mobile IP technologies face challenges in incorporating the prefix delegation feature, particularly in environments where service providers do not want Home Agent functionality within customer networks, limiting the ability to manage network prefixes and mobile node addresses effectively.
Innovation Solution
A Customer Premises Edge (CPE) router is utilized to manage network prefixes and act as a proxy Home Agent, dividing allocated prefixes among its interfaces, performing Duplicate Address Detection, and assisting in routing and notifying nodes of registration and de-registration, while maintaining a virtual home network for mobile nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Home Agent functionality is implemented within customer networks, then mobile node address management is simplified, but service providers lose control over prefix delegation and address allocation
Solution Approach 1:
The CPE router acts as an intermediary between the mobile node and the service provider's network. It receives prefix delegation from the service provider via DHCP and then performs Home Agent functions locally, mediating between the need for provider control and the need for simplified mobile node management.
Solution Approach 2:
The system segments the Home Agent functionality into two parts: prefix delegation management remains with the service provider's DHCP server, while actual address allocation and Mobile IP agent functions are segmented to the CPE router at the customer premises, allowing independent optimization of each function.
2Adaptability or versatility
If CPE router acts as proxy Home Agent, then prefix delegation and mobility management are enabled, but device complexity increases
Solution Approach 1:
The CPE router is designed to perform multiple functions: it acts as a DHCP client to receive prefix delegation, serves as a router for local network traffic, and functions as a proxy Home Agent for Mobile IP. This multi-functionality consolidates what would otherwise require separate devices.
Solution Approach 2:
The patent merges the DHCP client functionality, routing functionality, and Mobile IP proxy Home Agent functionality into a single CPE router device, reducing overall system complexity compared to having separate dedicated devices for each function.
3Adaptability or versatility
If traditional Home Agent functionality is avoided in customer networks, then service provider control is maintained, but mobile node roaming and address management become difficult
Solution Approach 1:
The CPE router serves as a mediator that allows service provider control to be maintained at the prefix delegation level while enabling full Mobile IP functionality at the customer premises. The provider controls prefix allocation via DHCP, while the CPE router handles the complex Mobile IP agent functions.
Solution Approach 2:
The mobile node can autonomously obtain its home address from the CPE router's prefix and perform self-registration with the proxy Home Agent, enabling ease of operation without requiring complex manual configuration or direct service provider intervention.
Data Source
AI summary
Methods and apparatus for supporting the management of mobility and addresses by a Customer Premises Edge (CPE) router in a Mobile IP environment are disclosed. When a network prefix is allocated by a DHCP router to the CPE router, the CPE router divides the network prefix among its interfaces, and allocates home addresses to Mobile Nodes connected to its interfaces, as appropriate. The CPE router also assists in performing Duplicate Address Detection (DAD) to ensure that a home address that has been allocated has not already been assigned to another node. Upon completion of registration of a Mobile Node that is connected to one of the interfaces of the CPE router with its Home Agent, the CPE router assists in routing traffic to the Mobile Node. In addition, the CPE router assists in notifying nodes when one of the Mobile Nodes has moved, as well as when one of the Mobile Nodes has de-registered with the Home Agent.