Ultrasonic Pulse Communication for Sensor Network Energy Reduction
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Solution Overview
Problem
Traditional wireless sensor networks are energy inefficient due to the overhead associated with transmitting single bits of data using packet communication, which is not suitable for binary event sensing in multi-hop networks where direct communication between sensors and a sink is not always possible.
Innovation Solution
The implementation of a pulse-switching communication method using ultrasonic pulses to encode event information, where sensors transmit a single pulse to signify event occurrence, and intermediate nodes relay these pulses to the sink while maintaining the pulse's origin information for event localization, reducing energy consumption by eliminating packet overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet communication is used to transmit event information, then data can be transmitted reliably, but energy consumption increases due to communication overhead
Solution Approach 1:
The patent extracts and eliminates the packet overhead components (headers, checksums, synchronization preambles) from the communication protocol, retaining only the essential data transmission functionality. This is achieved by using raw ultrasonic pulses instead of structured packets, directly removing the energy-consuming overhead elements while preserving core communication reliability
Solution Approach 2:
The patent changes the communication parameter from structured packets with multiple bytes to single-bit pulse representations. By encoding event information in the presence or absence of ultrasonic pulses rather than using traditional packet formats, the system fundamentally alters the data transmission parameter to eliminate overhead while maintaining reliability through the pulse-based encoding scheme
2Loss of information
If traditional packet communication is used for binary event sensing, then complete data transmission is achieved, but communication efficiency decreases due to processing and buffering overhead
Solution Approach 1:
The patent removes the processing and buffering overhead components from the communication system by eliminating the need for packet assembly, header processing, checksum verification, and synchronization preamble handling. The system directly transmits event information through ultrasonic pulses without intermediate processing steps, thereby extracting the essential transmission function while discarding inefficient overhead operations
Solution Approach 2:
The ultrasonic pulse transmission system is self-sufficient and does not require external processing or buffering infrastructure. The presence or absence of a pulse directly encodes the event information, eliminating the need for separate processing and buffering systems that would otherwise be required to handle packet-based communication, thus achieving communication efficiency through self-service operation
3Reliability
If packet communication protocol is used, then data can be transmitted with error checking, but data transmission overhead increases
Solution Approach 1:
The patent extracts and removes the error checking overhead components (checksums, error detection codes, retransmission protocols) from the communication system. By using ultrasonic pulses with inherent temporal and amplitude characteristics that naturally indicate event occurrence, the system eliminates the need for separate error checking mechanisms while maintaining reliability through the physical properties of the pulse transmission medium
Solution Approach 2:
The ultrasonic pulse serves multiple functions simultaneously: it encodes the event occurrence, carries timing information, provides amplitude-based event characterization, and inherently indicates transmission success through its detectability. This multi-functionality consolidates what would otherwise require separate error checking and data transmission mechanisms into a single efficient signal, reducing overhead while maintaining reliability
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 significantly reduces energy consumption by minimizing data transmission overhead and allows for efficient event detection and localization in multi-hop networks, particularly suitable for structural health monitoring and intrusion detection applications.
Implementation Method 1
a transducer (e.g., a piezoelectric wafer active sensor) coupled to the second substrate
Implementation Method 2
sensors mounted to a structure (such as the wing of an aircraft) can use the structure itself to transfer signals
Implementation Method 3
A receiver, such as a second PWAS, measures the received signal strength
Data Source
AI summary
A sensor network includes a sink and multiple sensor nodes. The sink is coupled to a substrate and configured to transmit a periodic ultrasonic pulse on the substrate. A first one of the sensor nodes is coupled to the substrate. The first sensor node is configured to (i) receive the periodic ultrasonic pulse from the substrate, (ii) synchronize an internal clock of the first sensor node to the sink based on the periodic ultrasonic pulse, (iii) selectively detect an event in a region surrounding the first sensor node, and (iv) in response to detecting the event, transmit a first ultrasonic pulse toward the sink on the substrate.