Bidirectional Event Sensor Network Coordinator Energy Management
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Solution Overview
Problem
Wireless sensor networks in U-healthcare environments face challenges in energy efficiency due to issues like collision, idle listening, and control packet overhead, leading to increased energy consumption during wireless communication, data processing, and data collection.
Innovation Solution
A bidirectional event transmission sensor network communication method that includes a coordinator and sensor nodes, utilizing a super frame structure with standby slots for energy-efficient event detection and synchronization, reducing unnecessary transmissions and receptions by distinguishing interference and optimizing beacon transmission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor nodes continuously monitor for events in wake-up mode, then event detection capability is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic wake-up cycles where sensor nodes alternately sleep and wake to check for events. During wake-up mode, nodes monitor for a predetermined time period, then return to sleep mode. This periodic operation maintains event detection capability while significantly reducing average energy consumption compared to continuous monitoring.
Solution Approach 2:
The coordinator node performs bidirectional event detection, monitoring both uplink events from sensor nodes and downlink events to sensor nodes. This self-service approach at the coordinator level reduces the need for individual sensor nodes to continuously monitor, as the coordinator can detect and respond to downlink events on behalf of the network.
2Measurement precision
If coordinator transmits synchronization packets frequently, then synchronization accuracy is improved, but communication overhead increases
Solution Approach 1:
The system dynamically adjusts synchronization packet transmission based on detected events. The coordinator transmits synchronization packets at wake-up moments when events are detected, rather than using fixed periodic intervals. This dynamic approach maintains synchronization accuracy when needed while reducing unnecessary transmissions during normal operation.
Solution Approach 2:
The coordinator transmits synchronization packets before sensor nodes enter wake-up mode to prepare them for potential event detection. This preliminary synchronization ensures nodes are ready to accurately timestamp and report events when they wake, maintaining synchronization accuracy without requiring continuous packet transmission.
3Reliability
If sensor nodes remain in wake-up mode longer, then data transmission reliability is improved, but energy efficiency deteriorates
Solution Approach 1:
Sensor nodes operate in periodic wake-up cycles with predetermined durations. Each node wakes for a specific time period to check for events and transmit data if needed, then returns to sleep mode. This periodic operation ensures nodes are available for communication when necessary while minimizing energy consumption through structured sleep intervals.
Data Source
AI summary
A communication method of a coordinator in a bidirectional event transmission sensor network comprising a sensor node and the coordinator is provided. The method includes sensing, in an uplink section, whether a signal having energy greater than or equal to a predetermined magnitude is received, the signal indicating occurrence of an uplink event detected by the sensor node, and transmitting, to the sensor node in a downlink section, a synchronization packet that is used for receiving the uplink event or for transmitting a downlink event in response to the coordinator detecting the downlink event or sensing the signal having energy greater than or equal to the predetermined magnitude in the uplink section. The bidirectional event transmission sensor network has a structure of a super frame that includes at least one standby slot (SS) including the uplink section and the downlink section.