Adaptive Acknowledgement Wait Duration for IoT Retransmission
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Solution Overview
Problem
In networked devices, especially in IoT environments, setting optimal acknowledgement wait durations for unicast packet transmissions is challenging due to varying processing and communication capabilities among devices, leading to inefficient retransmissions or prolonged wait times, as conventional methods rely on fixed settings that may not account for the diverse performance characteristics of devices in the network.
Innovation Solution
A method is implemented to dynamically determine and adjust the acknowledgement wait duration for each receiver node based on actual measurement, storing this data in a 'neighbour table' to optimize retransmissions by using device-specific acknowledgement wait durations, reducing latency and accommodating both fast and slow processing platforms within the same network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed acknowledgement wait duration is used for all devices, then network simplicity is maintained, but retransmission efficiency deteriorates due to mismatched wait times for devices with different processing speeds
Solution Approach 1:
The patent implements dynamic adjustment of acknowledgement wait duration based on actual device performance. The system measures the processing speed of each device and adapts the wait duration accordingly, transitioning from a static fixed value to a dynamic device-specific value. This resolves the contradiction by allowing the network to maintain simplicity in configuration while achieving high retransmission efficiency through automatic adaptation.
Solution Approach 2:
The patent changes the parameter of acknowledgement wait duration from a fixed network-wide value to a variable device-specific value. By measuring actual device performance and adjusting the wait duration parameter for each device, the system optimizes retransmission timing without requiring complex manual configuration, thus resolving the contradiction between network simplicity and retransmission efficiency.
2Adaptability or versatility
If the acknowledgement wait duration is extended to accommodate slow devices, then all devices can be supported, but latency increases for fast devices
Solution Approach 1:
The patent applies local quality by assigning different acknowledgement wait durations to different devices based on their individual processing capabilities. Instead of using a uniform wait duration across the network, the system tailors the wait time to each device's specific performance characteristics. This allows fast devices to use shorter wait times (reducing latency) while slow devices use longer wait times (ensuring compatibility), thus resolving the contradiction between device compatibility and transmission latency.
Solution Approach 2:
The system dynamically determines the appropriate acknowledgement wait duration for each device by measuring its processing speed. This dynamic adaptation allows the network to automatically adjust to devices with varying performance levels, ensuring that fast devices experience minimal latency while slow devices are fully supported, thereby resolving the contradiction between adaptability and time loss.
3Reliability
If frequent retransmissions are performed to ensure delivery, then reliability is improved, but network bandwidth is wasted due to premature retransmissions
Solution Approach 1:
The patent implements feedback by measuring the actual time taken by each device to process and acknowledge packets. This feedback information is used to adjust the acknowledgement wait duration, creating a closed-loop system that optimizes retransmission timing. By using feedback from actual device performance, the system avoids premature retransmissions (reducing bandwidth waste) while ensuring reliable delivery, thus resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The system changes the retransmission parameter (acknowledgement wait duration) based on measured device performance. By adjusting this parameter dynamically, the system achieves reliable data delivery without unnecessary retransmissions, thereby resolving the contradiction between reliability and network bandwidth consumption.
4Productivity
If device-specific acknowledgement wait durations are implemented, then retransmission efficiency is improved, but system complexity increases due to measurement and storage requirements
Solution Approach 1:
The patent implements self-service by having each device automatically measure its own processing speed and determine its optimal acknowledgement wait duration. The system performs self-characterization without requiring external configuration or intervention. This automatic self-configuration approach resolves the contradiction by achieving high retransmission efficiency through device-specific parameters while minimizing system complexity, as the devices configure themselves rather than requiring complex external setup.
Solution Approach 2:
The system uses feedback from actual device performance measurements to automatically determine device-specific acknowledgement wait durations. This feedback-driven automatic configuration eliminates the need for manual setup or complex system configuration, thereby achieving high retransmission efficiency without proportionally increasing system complexity.
Data Source
AI summary
A machine-implemented method for controlling retry of unicast data packet transmission from a transmitter node to a receiver node comprises selecting a receiver node from a set of receiver nodes having different processing delays; transmitting a first unicast data packet to the receiver node; establishing a delay, at the transmitter node, for an expected acknowledgement wait duration; receiving, at the transmitter node, an acknowledgement packet from the receiver node; responsive to an actual acknowledgement wait duration being less than the expected duration, setting the expected duration to a new expected duration comprising at least the actual wait duration; transmitting a second unicast data packet to the receiver node; establishing a delay, at the transmitter node, for the new expected duration; and responsive to expiry of the new expected duration without receipt of an acknowledgement packet from the receiver node, retrying transmitting the second unicast data packet.