Sensor Network Time Slot Relaying for Link Extension
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Solution Overview
Problem
Low energy critical infrastructure monitoring (LECIM) networks face challenges in maintaining long-term operation of sensor devices with limited power, as they cannot increase transmission distance due to power constraints, leading to frequent battery replacement and reduced operational lifespan in wireless environments with changing conditions.
Innovation Solution
A sensor network architecture that includes a network coordinator, sensor devices, and repeaters operating in a cyclic-superframe structure with time-slot relaying, using a beacon-based link structure and frame relay method to extend the transmission range while minimizing power consumption, maintaining star-topology and enabling low-power wireless network expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensor devices transmit data wirelessly over long distances, then network coverage is improved, but power consumption increases and operational lifespan decreases
Solution Approach 1:
The network is segmented into multiple hierarchical levels with network coordinators at higher levels and sensor devices at lower levels. Each sensor device communicates with its local network coordinator, which then relays data upward through the hierarchy. This segmentation allows sensor devices to transmit over short distances only, minimizing their power consumption while achieving wide overall network coverage through the coordinated multi-level structure.
Solution Approach 2:
Network coordinators act as intermediaries between sensor devices and the central system. Sensor devices transmit data to nearby network coordinators, which then handle long-distance transmission and relay data upward through the hierarchy. This intermediary approach allows sensor devices to avoid direct long-distance transmission, significantly reducing their power consumption while maintaining extended network coverage.
2Area of stationary object
If sensor devices increase transmission distance to expand coverage, then network area is improved, but battery life decreases due to frequent power usage
Solution Approach 1:
The transmission path is segmented into multiple short hops through hierarchical levels. Sensor devices perform only short-distance transmissions to their local network coordinators, while higher-level coordinators handle longer transmission segments. This segmentation of the transmission path allows the network to achieve wide coverage without requiring individual sensor devices to expend excessive energy on long-distance transmission, thereby extending battery lifespan.
Solution Approach 2:
The network transitions from a flat two-dimensional coverage model to a three-dimensional hierarchical structure with multiple transmission levels. Sensor devices operate at the base level with limited transmission range, while network coordinators operate at higher levels with extended ranges. This dimensional change allows the system to achieve wide area coverage through vertical hierarchy rather than requiring each sensor device to transmit over long horizontal distances, preserving battery life.
3Length of stationary object
If peer-to-peer topology is used to extend network coverage, then transmission distance is improved, but control message exchange increases power consumption
Solution Approach 1:
The network control structure is segmented into hierarchical levels with network coordinators managing specific zones. Control messages are exchanged only between adjacent hierarchical levels rather than between all peer devices. This segmentation of control communication reduces the number of control message exchanges required compared to a flat peer-to-peer topology, thereby reducing the power consumption associated with control message transmission while maintaining extended network coverage.
Data Source
AI summary
A sensor network includes: a network coordinator that broadcasts a first beacon frame; a sensor device that receives a frame from the network coordinator or transmits a frame to the network coordinator; and at least one repeater that relays the frame of the network coordinator to the sensor device or relays the frame of the sensor device to the network coordinator and that broadcasts a second beacon frame that is synchronized with the first beacon frame, wherein the sensor device is synchronized with the second beacon frame to transmit/receive the frame, the cyclic-superframe includes a plurality of slotted-superframes corresponding to the first beacon frame and the second beacon frame, and the network coordinator, the sensor device, and the repeater operate in a periodically repeated cyclic-superframe structure.