Radio Node Role Selection in Wireless Networks
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Solution Overview
Problem
Existing wireless communication networks face challenges in adaptivity due to centralized role selection methods that do not account for local availability of devices and result in excessive signaling, especially when new nodes join the network or when device densities and topologies change.
Innovation Solution
A method for radio nodes to independently select their roles as router or non-router nodes based on detected density and other factors like route cost and interference, using a density margin and hysteresis values to optimize the number of router nodes and efficiently use spectrum resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If centralized role selection is used, then node complexity is reduced, but adaptivity to local device availability deteriorates
Solution Approach 1:
The role selection process is segmented into two parts: centralized initialization by the root node, and distributed local decision-making by individual nodes. Nodes independently evaluate their own conditions (battery level, data queue status) and select roles autonomously after initial guidance, combining centralized coordination with local adaptivity.
Solution Approach 2:
Each node makes role selection decisions based on its local conditions and characteristics rather than following uniform centralized commands. Nodes assess their own battery status, data queue depth, and network position to determine appropriate roles (router, non-router, super-saving), enabling locally optimized decisions.
2Productivity
If all nodes exchange path metric information, then routing efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and removes unnecessary nodes from the routing information exchange process. Only nodes that are actually part of the data path (routers) exchange path metric information, while non-router nodes and super-saving nodes are excluded from this signaling overhead, reducing energy consumption while maintaining routing efficiency.
Solution Approach 2:
Instead of all nodes participating in path metric exchange, only the necessary subset (routers in the data path) perform this function. This partial action approach achieves sufficient routing efficiency without the excessive signaling overhead that would result from universal participation.
3Adaptability or versatility
If nodes dynamically switch roles, then adaptivity is improved, but network stability deteriorates
Solution Approach 1:
Nodes perform role selection periodically based on changing conditions rather than continuously or irrevocably. The root node periodically re-evaluates and updates node roles based on current network state, allowing dynamic adaptation while maintaining periodic stability through structured re-assessment intervals.
Solution Approach 2:
The system implements feedback mechanisms where nodes report their status (battery level, data queue) to the root node, which then adjusts role assignments accordingly. This feedback loop enables adaptive role switching while maintaining network stability through controlled, information-based decision-making rather than arbitrary changes.
Data Source
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Figure 3B
AI summary
The invention relates to a wireless communication system (100), comprising a plurality of radio nodes, each being able to operate at least as a router node (104) or as a non-router node (104). Each of the plurality of radio nodes is configured to: detect density of the router nodes (104) within its neighbourhood, and make a decision based on the detected density whether to operate as a router node (104) or as a non-router node (106). The invention relates also to a role selection method and a radio node device (104, 106, 500) for the wireless communication system (100).