Coordinator Power Heterogeneity for Sensor Network Downlink
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Solution Overview
Problem
Current low power wireless network systems face challenges in reliable downlink data transmission due to insufficient research and high overhead in existing technologies, particularly in multi-hop routing scenarios, leading to inter-cell interference and the need for multiple coordinators.
Innovation Solution
A system that uses a coordinator connected to multiple sensor nodes via a single transmission passage, with a separate power source supplying high power to the coordinator for direct data transmission and battery-powered sensor nodes operating in sleep and reception modes to optimize power usage and reduce overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-hop routing is used for downlink transmission in low power wireless networks, then data can reach remote nodes, but transmission reliability deteriorates due to high overhead and inter-cell interference
Solution Approach 1:
The patent extracts the coordinator node from the multi-hop routing structure and equips it with high power transmission capability through a separate power source. This allows the coordinator to directly transmit downlink data to all sensor nodes without relying on multi-hop routing, thereby eliminating routing overhead and improving transmission reliability.
Solution Approach 2:
The patent changes the power parameter of the coordinator node by connecting it to a separate high power source, distinguishing it from the low power sensor nodes. This parameter change enables the coordinator to transmit data directly over long distances, resolving the contradiction between transmission reliability and routing complexity.
2Area of stationary object
If multiple coordinators are deployed to cover wide areas, then downlink transmission coverage is improved, but system complexity increases due to inter-cell interference and coordination requirements
Solution Approach 1:
The patent creates an asymmetric network structure where one coordinator node is equipped with high power transmission capability while sensor nodes operate at low power. This asymmetric design allows a single coordinator to cover a wide area without requiring multiple coordinators, thereby reducing network configuration complexity and eliminating inter-cell interference while maintaining large coverage area.
3Reliability
If sensor nodes operate continuously to receive downlink data, then data reception reliability is improved, but power consumption increases significantly
Solution Approach 1:
The patent implements periodic action by having sensor nodes alternate between sleep mode and reception mode. Nodes wake up at predetermined intervals to receive downlink data from the high power coordinator, then return to sleep mode. This periodic operation maintains data reception reliability while significantly reducing power consumption compared to continuous operation.
Data Source
AI summary
A system for downlink transmission using heterogeneous power includes a plurality of sensor nodes, a coordinator connected to a network including the plurality of sensor nodes and configured to transmit data to the plurality of sensor nodes, a power source configured to supply power required for the coordinator to transmit data to each of the plurality of sensor nodes through a single transmission passage at a position away by a specific distance from the network, to the coordinator, and a battery configured to supply power required for the plurality of sensor nodes to perform communication within the network, to the plurality of sensor nodes, wherein when a destination node as a reception target of the data, among the plurality of sensor nodes, receives the data, the destination node transmits a signal indicating the data reception to the other remaining nodes among the plurality of sensor nodes.