Wireless Mesh Network Delay Optimization via Distance-Based Parameter Control
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Solution Overview
Problem
Large-scale wireless mesh networks face scalability issues due to high end-to-end retransmission delays and data packet losses, particularly in outdoor lighting systems with many luminaire nodes, where data packets often travel multiple hops, leading to reduced network throughput and increased delays.
Innovation Solution
A device and method that adjust transmission parameters based on the distance traveled by data packets, prioritizing long-traveled packets to increase their survival chances and reduce end-to-end delays, by modifying parameters such as maximum retransmissions, transmit power, and back-off times, and dynamically adjusting these parameters based on the distance and packet type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data packets are transmitted through multiple hops in large-scale wireless mesh networks, then network coverage and connectivity are improved, but end-to-end retransmission delays increase and packet delivery reliability deteriorates
Solution Approach 1:
The patent dynamically changes transmission parameters (power level, retransmission attempts, back-off times) based on the hop distance of data packets. Long-traveled packets receive increased transmission power and more retransmission attempts, while short-traveled packets use standard parameters. This parameter adaptation resolves the contradiction by compensating for the increased delay risk in multi-hop transmissions without unnecessarily increasing delays for short-distance packets.
2Reliability
If transmission parameters are increased for long-traveled data packets to improve delivery reliability, then packet loss is reduced, but network energy consumption and interference increase
Solution Approach 1:
The patent applies different transmission quality levels to different data packets based on their specific needs. Long-traveled packets receive enhanced transmission parameters (higher power, more retries) only when necessary, while short-traveled packets use standard parameters. This localized quality adjustment improves overall reliability without uniformly increasing energy consumption across the network.
3Device complexity
If uniform retransmission time-out values are used for all data packets, then system complexity is reduced, but end-to-end delay homogeneity deteriorates
Solution Approach 1:
The patent makes the retransmission time-out value dynamic rather than uniform. The time-out is adjusted based on the hop distance of each data packet, with longer timeouts for long-traveled packets and shorter timeouts for short-traveled packets. This dynamic adjustment maintains delay homogeneity across the network while managing complexity through a systematic adjustment rule rather than complex per-packet optimization.
Data Source
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AI summary
For reducing and homogenizing an end-to-end delay of data packet transmissions in a large-scale wireless mesh network, a device, a system and a method are provided for controlling data packet transmission in the wireless network, wherein transmission parameters of an intermediate node are adjusted based on a distance between the intermediate node and a sender node.