Regional Positioning in Wireless Sensor Networks
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Solution Overview
Problem
Traditional positioning methods in wireless sensor networks face challenges in accurately detecting the location of targets, especially when they do not clearly enter a sensing area or when valid sensing areas are not appropriately distributed, leading to errors and increased network traffic and power consumption.
Innovation Solution
A regional positioning method and apparatus that sets a locating premise based on signal strength, allowing a sensor node to recognize its location by connecting with anchor nodes and dividing the premise into overlapped and non-overlapped areas, reducing network load and improving location recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods use sensing area entry detection, then target location can be detected when clearly entering, but location detection fails when target does not clearly enter or sensing areas are not appropriately distributed
Solution Approach 1:
The patent introduces an intermediary calculation method that uses radio signal strength (RSS) as a mediator between the target node and anchor nodes. Instead of directly detecting target entry into sensing areas, the system measures signal strength values and calculates location through triangulation or centroid methods, providing a reliable intermediary mechanism that works even when clear sensing area entry cannot be determined.
Solution Approach 2:
The patent changes the measurement parameter from binary sensing area entry detection to continuous radio signal strength measurement. By using RSS values that vary continuously with distance, the system can determine location even when targets do not clearly enter predefined sensing areas, thus improving both accuracy and reliability across different scenarios.
2Measurement precision
If distance-based positioning methods are used with multiple anchor nodes, then location accuracy improves through triangulation, but network traffic load and power consumption increase
Solution Approach 1:
The patent implements partial action by allowing target nodes to perform location calculation only when necessary (when location information is needed), rather than continuously. The system uses event-triggered updates where calculation is performed based on changes in signal strength or movement detection, reducing unnecessary computational overhead and power consumption while maintaining adequate location accuracy.
Solution Approach 2:
The target node performs self-service by autonomously calculating its own location using received signal strength information from anchor nodes. This eliminates the need for continuous location queries and responses between nodes, reducing network traffic. The target node independently processes signal strength measurements and applies triangulation or centroid methods to determine its position.
3Adaptability or versatility
If centroid method is used for location calculation, then positioning can be performed without distance information, but network traffic varies depending on locating engine position and additional traffic is loaded
Solution Approach 1:
The patent applies preliminary action by having anchor nodes pre-calculate and store centroid information based on their known locations. When a target node needs location information, it uses these pre-computed centroid data along with current signal strength measurements, avoiding the need for real-time multi-node communication for calculation. This reduces network traffic while maintaining the flexibility of the centroid method.
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
This approach enables accurate target location recognition with reduced network traffic and power consumption, satisfying application requirements by using connection settings and sensing information to determine the target's location within a communication radius.
Implementation Method 1
setting a locating premise in the WSN based on a signal strength of an anchor node
Data Source
AI summary
A regional positioning method and apparatus in a wireless sensor network (WSN) is provided. The regional positioning method in a WSN, the regional positioning method including: setting a locating premise in the WSN based on a signal strength of an anchor node; sensing an event where a sensor node, installed in a target and called a target node, joins the WSN; detecting a locating premise where the target node is located based on the sensing of the event; and recognizing a location of the target based on the detected locating premise.