Proxy Mobile IP Subscriber Mobility Cable Network
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Solution Overview
Problem
Cable operators face challenges in providing subscriber mobility in wireless cable network environments, often requiring nested tunnels and resulting in increased packet overhead, which affects the subscriber experience and QoS across DOCSIS links.
Innovation Solution
The system employs Proxy Mobile Internet Protocol (PMIP) for micromobility management between a cable modem and a CMTS, leveraging DOCSIS technology for authentication and control channels, and assigns subscriber policy profiles to ensure quality of service parameters are mapped to DOCSIS priority levels, eliminating the need for nested tunnels and reducing packet overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If nested tunnels are used for mobility management in cable networks, then subscriber mobility can be provided, but packet overhead increases significantly
Solution Approach 1:
The patent extracts and eliminates the nested tunneling mechanism from the mobility management architecture. By using PMIP with locally terminated tunnels at the CMTS, the solution removes the need for multiple nested encryption layers while maintaining mobility functionality, thereby significantly reducing packet overhead.
Solution Approach 2:
The CMTS acts as an intermediary that terminates the bearer tunnel locally, preventing the need for nested tunnels. The PMIP protocol serves as a mediator between the mobile endpoint and the network, enabling mobility management without requiring nested tunneling structures.
2Adaptability or versatility
If nested tunnels are used for mobility management, then subscriber mobility is enabled, but network complexity increases
Solution Approach 1:
The patent removes the complex nested tunneling infrastructure from the network architecture. By implementing PMIP with local tunnel termination at the CMTS, the solution simplifies the network structure while maintaining the ability to manage subscriber mobility across different locations.
Solution Approach 2:
The CMTS is designed to perform multiple functions including bearer tunnel termination, QoS policy enforcement, and mobility management through PMIP. This multi-functionality reduces the need for separate dedicated components, thereby simplifying the overall network architecture.
3Adaptability or versatility
If existing cable network architecture is used, then infrastructure utilization is maximized, but suitable mobility support is not provided
Solution Approach 1:
The patent makes the existing cable network infrastructure universal by enabling it to support both traditional fixed services and mobile services through PMIP. The CMTS and access gateway are configured to handle both wired and wireless traffic, allowing the same infrastructure to serve dual purposes without requiring separate dedicated networks.
Solution Approach 2:
The access gateway serves as an intermediary that bridges the existing cable network infrastructure with mobile wireless services. It translates between the cable network protocols and mobile network protocols, enabling mobility support while utilizing the existing backhaul infrastructure.
Data Source
AI summary
A method is provided in one example embodiment and includes creating a service flow with an endpoint over a wireless link coupled to a backhaul; notifying a mobility anchor of a location associated with the endpoint; relaying control packets between the endpoint and an access gateway; and relaying bearer packets between the endpoint and the mobility anchor, where the bearer packets are exchanged with the endpoint over a locally terminated bearer tunnel and the bearer packets are exchanged with the mobility anchor using Proxy Mobile Internet Protocol.