Wireless Node Localization via Dedicated Anchor Nodes
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Solution Overview
Problem
Existing wireless networks face challenges in accurately locating mobile nodes while minimizing energy consumption and network complexity, particularly in dense environments where access point failures and interference are concerns.
Innovation Solution
A wireless computer network with a server and nodes using anchors for precise location calculation, where the server commands selected anchors to perform radio distance measurements with the node, allowing the node to remain in a low-power state most of the time and reducing the need for frequent handovers, and using a tree topology with separate infrastructure for data exchange and localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrastructure-based localization using multiple access points is used to improve location accuracy, then measurement precision is improved, but device complexity and energy consumption increase
Solution Approach 1:
The system segments the localization function by introducing dedicated anchor nodes that are solely responsible for position estimation, separating this function from general-purpose access points. This segmentation allows the network to achieve accurate localization without requiring all access points to participate in complex localization protocols, thereby reducing overall network complexity while maintaining measurement precision.
Solution Approach 2:
Anchor nodes serve as intermediaries between mobile nodes and the localization server. These anchors receive positioning requests from the server, perform radio distance measurements with mobile nodes, and return results to the server. This intermediary role simplifies the localization process by creating a dedicated measurement layer that doesn't burden the entire network infrastructure.
2Measurement precision
If more access points are deployed to increase localization accuracy, then measurement precision is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
Anchor nodes are designed as multi-functional elements that can perform both data communication and radio distance measurement tasks. This universality means that the same hardware infrastructure serves dual purposes, eliminating the need for separate dedicated localization devices and reducing overall deployment costs while maintaining accurate location tracking.
Solution Approach 2:
The system enables self-service localization where mobile nodes can determine their position using measurements from multiple anchors without requiring active participation from other network elements. The anchors independently perform measurements and report to the server, which computes positions autonomously, reducing the need for expensive centralized localization infrastructure.
3Reliability
If mobile devices actively participate in handover procedures to maintain connectivity, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system performs preliminary actions by having anchors continuously monitor and measure radio distances to mobile nodes before handover is actually needed. The server maintains updated position information and can proactively redirect traffic or initiate handovers based on predicted mobility patterns, reducing the need for reactive handover procedures that consume mobile device energy.
Solution Approach 2:
The server acts as an intermediary that manages connectivity and handover decisions centrally based on position information from anchors. Mobile nodes simply report their position to the server, which then handles all complex handover logic and routing decisions, significantly reducing the energy burden on mobile devices while maintaining reliable connectivity.
4Reliability
If access points use robust designs to prevent failures and maintain reliability, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The system implements beforehand cushioning through redundant anchor nodes and server-based position calculation. If one anchor or access point fails, the server can still compute positions using measurements from remaining anchors, and mobile nodes can be redirected through alternative paths. This redundancy provides fault tolerance without requiring each individual access point to be overly robust or complex.
Solution Approach 2:
The system extracts the critical reliability function from individual access points and concentrates it at the server level through centralized position calculation and routing decisions. By taking out the complex reliability management logic from distributed access points and centralizing it, individual access points can remain simple while the system as a whole achieves high reliability through server coordination and anchor redundancy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves location accuracy, reduces network costs by using simpler access points, and extends battery life of mobile nodes through reduced energy consumption and increased redundancy, enabling denser network deployment.
Implementation Method 1
perform the radio distance measurement between said anchor and said node on the basis of said response
Data Source
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AI summary
Wireless local area network integrating seamless location and roaming of mobile nodes. The device of the invention comprises a server (110) constituting the network core, fixed access points (120) providing the low-level protocol, fixed anchors (140) providing the location function, and nodes (140) equipped with sensors and actuators depending on the network's purpose. The integration of network layers above the physical layer within the server enables seamless roaming and approximate node location by the network with each transmitted frame. The denser anchor network allows for precise node location, on demand, through time-of-flight distance measurement of radio waves, with the nodes then acting as active radio reflectors.