Ad Hoc Network Node Transmission Control for Band and Route Stability
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Solution Overview
Problem
Conventional wireless sensor networks face a trade-off between improving frame reachability and radio band occupancy due to independent retransmission and routing control processes, where increasing retransmissions enhances reachability but occupies the radio band, and switching routes can lead to unstable paths.
Innovation Solution
A transmission control method that counts neighboring nodes in an ad hoc network to determine the number of retransmissions and changes routes based on density, associating second-layer retransmission control with third-layer routing control to manage radio band usage and route stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of retransmissions is increased to improve frame reachability, then frame reachability is improved, but radio band occupancy increases
Solution Approach 1:
The patent makes the retransmission count dynamic by adjusting it based on RSSI measurements. When signal strength is good, fewer retransmissions are performed; when signal strength is poor, more retransmissions are allowed. This dynamic adjustment resolves the contradiction by optimizing the balance between frame reachability and radio band occupancy according to actual channel conditions.
Solution Approach 2:
The patent changes the parameter of retransmission count based on RSSI threshold values. Different RSSI ranges correspond to different retransmission counts, allowing the system to adaptively control radio band usage while maintaining adequate frame delivery probability. This parameter change approach directly addresses the trade-off between reliability and energy loss.
2Device complexity
If routing control and retransmission control are performed independently, then layer independence is maintained, but frame reachability and radio band management cannot be optimized simultaneously
Solution Approach 1:
The patent merges routing control (layer 3) and retransmission control (layer 2) by having the retransmission count determination depend on both layer 2 RSSI measurements and layer 3 routing information. This merging allows joint optimization of frame delivery and radio resource usage while maintaining the layered architecture's functional separation.
Solution Approach 2:
The patent introduces an intermediary mechanism where the determined retransmission count acts as a bridge between layer 2 and layer 3 controls. This intermediary parameter allows information and control to flow between layers, enabling coordinated optimization without breaking the OSI layering principle.
Data Source
AI summary
Each of the nodes counts the number of other nodes located in a communication area of the node among nodes in a multi-hop network, and determines the number of times to retransmit a frame based on the counted number of the other nodes. Each of the nodes transmits a frame to a destination node, and repeats retransmission of the frame the determined number of times until receiving a response to the transmitted frame. Subsequently, each of the nodes changes a route to the destination node to another route when it does not receive the response after repeating the retransmissions the determined number of times.