Distributed Roaming in Wireless Mesh Networks
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Solution Overview
Problem
Existing wireless mesh networks face challenges in providing scalable, reliable, and fast roaming services due to hierarchical topologies that introduce bottlenecks and long handoff latency, especially in dynamic environments with limited bandwidth and computing power, and current solutions like Mobile IP require significant changes to client software or result in signal degradation.
Innovation Solution
A distributed roaming system where a user's roaming profile is obtained from the permanent home agent and pre-forwarded to neighboring cells, allowing for quick handoffs between cells without direct communication with the permanent home agent, utilizing a proxy home agent to minimize latency and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hierarchical topology is used for roaming management, then centralized control is achieved, but handoff latency increases and scalability deteriorates
Solution Approach 1:
The patent segments the centralized home agent functionality into distributed proxy home agents deployed at multiple cells. Each proxy home agent handles roaming operations locally, eliminating the single point of contact bottleneck and reducing handoff latency by processing roaming operations in parallel rather than sequentially through a central node.
Solution Approach 2:
The patent introduces proxy home agents as intermediary nodes between mobile users and the permanent home agent. These intermediaries cache user profile information and handle roaming operations locally, reducing the need for frequent communications with the permanent home agent and thereby reducing handoff latency while maintaining centralized control for profile management.
2Reliability
If hierarchical topology is used for roaming management, then centralized control is achieved, but network scalability is limited
Solution Approach 1:
The patent segments the roaming management function across multiple proxy home agents distributed throughout the network. This segmentation allows the system to scale horizontally by adding more proxy nodes as the network grows, rather than requiring a single centralized home agent to handle all roaming operations for an expanding network.
Solution Approach 2:
The patent transitions from a single-dimensional hierarchical structure to a multi-dimensional distributed architecture where proxy home agents are deployed across multiple cells and geographical locations. This dimensional expansion enables the network to scale more effectively by distributing the roaming management load across the network space rather than concentrating it at a single point.
3Reliability
If roaming profile is obtained from permanent home agent during each handoff, then centralized control is maintained, but handoff latency increases
Solution Approach 1:
The patent performs preliminary actions by having proxy home agents cache user profile information in advance before handoff occurs. When a mobile user moves between cells, the proxy home agent already has the necessary roaming profile information available locally, eliminating the need to retrieve it from the permanent home agent during the critical handoff moment and thereby reducing latency.
Solution Approach 2:
The patent introduces proxy home agents as intermediaries that store and manage cached copies of user profile information. These intermediaries reduce the communication overhead between mobile users and the permanent home agent by handling profile retrieval and updates locally, thereby maintaining profile accuracy while reducing handoff latency.
4Area of stationary object
If more cells are added to the network, then network coverage is improved, but roaming overhead increases exponentially
Solution Approach 1:
The patent segments the roaming management function and distributes it across multiple proxy home agents deployed at different cells. This segmentation prevents any single node from becoming a bottleneck and allows the network to scale by adding cells without proportionally increasing the roaming overhead, as each new cell only needs to establish local proxy functionality rather than creating new communication paths through the entire network.
Solution Approach 2:
The patent implements local quality by enabling each cell with a proxy home agent to independently handle roaming operations for users within its coverage area. This local autonomy reduces the need for extensive inter-cell communication and information exchange, thereby preventing roaming overhead from increasing exponentially as the network expands to cover larger areas.
Data Source
AI summary
A method and system for distributed roaming in a wireless mesh network are disclosed. Cells are able to track and predict a users movement throughout the network. The user's roaming profile is forwarded to predicted future cells before the user actually enters those cells. When the user enters a new cell, roaming is completed without communication to any other cells. Thus, handoff time is reduced and users may more seamlessly move throughout the network coverage area.