On-Off Keying Acknowledgment for Wireless Node Energy Reduction
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Solution Overview
Problem
Energy-constrained nodes in wireless networks face inefficiencies due to high power consumption when using complex modulation schemes for robustness and retransmissions, as they often remain powered-on to verify transmission success, leading to decreased energy efficiency.
Innovation Solution
Implementing an acknowledgment scheme using amplitude modulation (AM) with on-off keying (OOK) for radio frequency transmissions, allowing nodes to rapidly acknowledge successful receipt and enter energy conservation mode, reducing power consumption by using link-based acknowledgments and processing multiple acknowledgments as a single transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex modulation schemes are used to increase robustness, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The communication protocol is segmented into two distinct phases: a low-power acknowledgment phase using simple amplitude modulation, and a high-robustness data transmission phase using complex modulation schemes. This segmentation allows the system to use simple, low-power modulation for acknowledgments while reserving complex modulation for when data transmission reliability is critical.
Solution Approach 2:
The patent employs a disposable, low-cost acknowledgment mechanism that uses simple amplitude modulation rather than persistent, complex modulation schemes. This cheap acknowledgment approach allows nodes to quickly verify reception without the ongoing power consumption of complex demodulation, enabling rapid transition to energy conservation mode.
2Reliability
If nodes remain powered-on to verify transmission success, then transmission reliability is improved, but energy efficiency decreases
Solution Approach 1:
The verification function is extracted from the main data transmission process and implemented as a separate, lightweight acknowledgment mechanism. This extracted acknowledgment phase uses minimal power consumption amplitude modulation, allowing nodes to verify transmission success without the ongoing energy cost of maintaining complex modulation schemes throughout the entire communication process.
Solution Approach 2:
The system performs a preliminary acknowledgment verification before committing to full data transmission. By using simple amplitude modulation for the acknowledgment phase, nodes can preliminarily verify reception success with minimal power consumption, then only engage complex modulation and full processing when the preliminary check passes and retransmission is needed.
3Reliability
If transceivers remain in receive state to acknowledge transmissions, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The transceiver operates dynamically by transitioning between different states: a low-power idle state, a brief high-sensitivity receive state for amplitude-modulated acknowledgments, and a processing state for validating the acknowledgment signal. This dynamic operation allows the transceiver to spend minimal time in power-consuming receive states while quickly returning to idle or sleep modes.
Solution Approach 2:
The transceiver employs periodic action by using brief, pulsed receive intervals for acknowledgment detection rather than continuous receive monitoring. The amplitude-modulated acknowledgment signal is detected during specific time windows, allowing the transceiver to periodically check for acknowledgments without maintaining continuous power consumption, then enter energy conservation mode until the next periodic check is needed.
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 minimizes energy requirements for acknowledging successful transmissions, reduces power consumption, and allows nodes to conserve energy by entering a sleep mode quickly, even if not all nodes acknowledge, thereby enhancing energy efficiency in wireless networks.
Implementation Method 1
a transmission between nodes in a network may be acknowledged with an acknowledgment transmission employing an amplitude modulation of a radio frequency
Implementation Method 2
The acknowledgment may employ an amplitude modulation of a radio frequency, which may employ on on-off keying (OOK) modulation
Data Source
AI summary
The disclosure relates to a transmission scheme for nodes in a network. More specifically, the disclosure relates to an acknowledgment scheme that minimizes energy requirements for an acknowledgment of a transmission between nodes. The disclosure describes that an energy constrained node may transmit to other nodes in a network and may only require that an acknowledgment of that transmission is received from at least one of the proximal recipients, which may or may not be the ultimate target. In order to minimize the complexity of the receiver in a node and its energy requirements, the acknowledgment scheme may employ simple on-off keying (OOK) irrespective of the modulation technique of the sending transmission. The acknowledgment comprises a series of OOK pulses sent at a specified time after receipt of the transmission. In addition, simultaneously received acknowledgments can be processed and verified without confusion.