Transmission Device Bandwidth Control for Multi-Hop Network Congestion
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Solution Overview
Problem
In multi-hop wireless packet transmission networks, adaptive multi-rate (AMR) modulation/demodulation schemes cause transmission bandwidth fluctuations, leading to congestion due to uneven bandwidth changes between relay stations, which can also be affected by link failures or other factors.
Innovation Solution
A transmission device connected to multiple relay stations that controls bandwidth based on the lowest transmission bandwidth among them, using bandwidth confirmation notification frames and information frames within Ethernet OAM to manage and adjust transmission bandwidths to prevent congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adaptive multi-rate (AMR) modulation/demodulation schemes are used to adjust transmission bandwidth according to wireless link state, then transmission efficiency is improved, but transmission bandwidth fluctuates causing congestion in the network
Solution Approach 1:
The patent implements a feedback mechanism where the transmission device receives bandwidth information from relay stations about their current transmission bandwidths. Based on this feedback, the transmission device adjusts its own transmission bandwidth to match the minimum bandwidth available in the multi-hop path, preventing data overflow and network congestion while maintaining efficient use of available bandwidth resources.
Solution Approach 2:
The transmission device proactively adjusts its transmission bandwidth before congestion occurs by obtaining bandwidth information from relay stations in advance. This preliminary action allows the transmission device to configure its transmission rate to match the bottleneck capacity of the multi-hop path, preventing excessive data flow that would cause congestion downstream.
2Speed
If transmission bandwidth is increased in some paths between relay stations, then data transmission speed is improved, but excessive bandwidth data flows into the network causing congestion
Solution Approach 1:
The transmission device dynamically changes its transmission bandwidth parameter based on the minimum bandwidth detected in the multi-hop path. By adjusting this critical parameter to match the bottleneck capacity, the system maintains high transmission speed where possible while preventing harmful data overflow that would cause congestion in narrower bandwidth sections of the network.
3Ease of operation
If bandwidth control is not implemented, then transmission device operates independently, but congestion occurs due to mismatched bandwidth between relay stations
Solution Approach 1:
The patent introduces bandwidth information as an intermediary element that mediates between the transmission device and relay stations. The transmission device requests and receives bandwidth information from relay stations, using this intermediate data to adjust its transmission rate. This intermediary mechanism enables coordinated bandwidth matching without requiring complex direct control connections, maintaining operational simplicity while ensuring reliability.
Data Source
AI summary
In a transmission network of a multi-hop connection in which a transmission bandwidth between relay stations changes, it is possible to prevent congestion from occurring due to a change in the transmission bandwidth between the relay stations. A transmission device connected to a network constituted of a plurality of relay stations includes a transmission section configured to transmit a signal to the network, and a bandwidth control section configured to control a transmission bandwidth of the transmission section based on a lowest transmission bandwidth among transmission bandwidths between the relay stations.