Distributed Beacon Coordination for Wireless Medium Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication networks face inefficiencies when a central coordinator moves out of range, leading to message collisions and disrupted access to the wireless medium, particularly in mobile networks where nodes may lose communication with each other.
Innovation Solution
A distributed beacon mechanism where each node generates and transmits beacons to reserve access to the wireless medium, allowing nodes within separate 'extended neighborhoods' to transmit simultaneously without risking collisions, eliminating the need for a central coordinator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central coordinator is used to coordinate access to the wireless medium, then access coordination is simplified and message collisions are reduced, but the system becomes vulnerable when the coordinator moves out of range of other nodes
Solution Approach 1:
The patent divides the network into multiple extended neighborhoods, each managed by a local coordinator. This segmentation allows nodes to coordinate access locally without depending on a single central coordinator, thereby maintaining reliability while improving adaptability to node mobility. When a coordinator moves out of range, other local coordinators can continue managing their respective neighborhoods independently.
2Productivity
If nodes transmit beacons simultaneously without coordination, then access speed increases and productivity improves, but message collisions occur and coordination becomes complex
Solution Approach 1:
The patent implements local coordination within extended neighborhoods, where each neighborhood has its own coordinator that manages beacon transmission timing for nodes in that neighborhood. This allows simultaneous beacon transmissions across different neighborhoods (improving productivity) while maintaining simple local coordination rules (avoiding complexity). Nodes only need to coordinate with immediate neighbors, not the entire network.
3Ease of operation
If a central coordinator manages all nodes, then access control is simplified, but the system cannot handle dynamic topology changes caused by mobile nodes
Solution Approach 1:
The patent creates a dynamic coordinator structure where any node can become a coordinator for its local extended neighborhood. This dynamic arrangement allows the network to adapt to topology changes caused by mobile nodes, as new coordinators can emerge and existing coordinators can lose range without disrupting the entire system. Access control remains simple at the local level while the overall system becomes adaptable to dynamic topology.
Data Source
AI summary
Each of a plurality of nodes in a wireless network is capable of generating, transmitting, and receiving beacons in a distribute fashion. Each beacon contains information regarding the order of which other nodes are to transmit beacons and wireless medium access information at to when various nodes are to access the network. Nodes that are in separate “extended neighborhoods” are permitted to transmit their beacons simultaneously without risking beacon collisions. The beacons contain information that is used to ensure this result. Using the distributed beacon mechanism, each nod can reserve access to the wireless medium. In the disclosed embodiments, a central coordinator is not needed.