Dynamic Aggregation Transmission Window Adaptation
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Solution Overview
Problem
The channel utilization efficiency of modern wireless communication systems, such as IEEE 802.11 networks, is compromised due to the limited Aggregation Transmission Window (ATW) size, which is affected by frame errors leading to reduced effective window size and increased jitter, especially at high frame error rates.
Innovation Solution
A dynamic adaptation mechanism for the ATW size based on feedback analysis, adjusting the maximum ATW (m-ATW) or target average ATW (e-ATW) according to channel conditions, traffic characteristics, and quality of service requirements, using a system comprising a transmission controller, device performance analyzer, and ATW estimator to optimize transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed maximum ATW size is used, then the system can maintain simple operation and negotiation, but channel utilization efficiency deteriorates due to reduced effective window size when frame errors occur
Solution Approach 1:
The patent implements dynamic ATW adjustment where the maximum ATW size is no longer fixed but adapts based on channel conditions and frame error rates. The system monitors transmission performance and dynamically modifies the ATW size to optimize channel utilization while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent changes the parameter of ATW size from a static negotiated value to a dynamic parameter that adjusts based on channel conditions. By monitoring frame error rates and transmission success, the system modifies the ATW size parameter to maintain high channel utilization efficiency under varying error conditions.
2Productivity
If the ATW size is increased to improve throughput, then more frames can be transmitted before acknowledgment, but jitter increases due to variable transmission success rates
Solution Approach 1:
The patent employs feedback mechanisms where the transmitter monitors acknowledgment patterns and frame error rates. Based on this feedback, the system dynamically adjusts the ATW size to maintain stable transmission performance. When error rates increase, the ATW is reduced to minimize jitter; when conditions improve, the ATW is increased to maximize throughput.
Solution Approach 2:
The patent makes the ATW size dynamic rather than fixed, allowing it to adapt to changing channel conditions. This dynamic adjustment balances throughput and jitter by optimizing the window size based on real-time transmission performance, preventing both excessive buffering and unnecessary retransmissions.
3Productivity
If a larger ATW is used to reduce acknowledgment overhead, then channel time is better utilized, but the impact of frame errors is amplified leading to greater efficiency loss
Solution Approach 1:
The patent dynamically changes the ATW size parameter based on frame error rates. When error rates are low, a larger ATW is used to maximize channel time utilization by reducing acknowledgment overhead. When error rates increase, the ATW is reduced to limit the impact of errors, thereby maintaining both efficiency and reliability.
Solution Approach 2:
The patent implements a dynamic ATW mechanism that adapts to channel conditions. This allows the system to optimize channel time utilization under good conditions while maintaining error resilience when conditions deteriorate, resolving the contradiction between maximizing throughput and maintaining reliability.
Data Source
AI summary
A communication system comprises a transmission controller configured to send transmissions to one or more transceivers; a device performance analyzer configured to receive feedback about the reception of transmissions at said transceivers, and to analyze such feedback to estimate the quality of communication with an existing ATW and to output a quality information; an ATW performance analyzer configured to receive the quality information of the device performance analyzer and to perform further analysis to estimate whether the ATW should be retained as in current operation or modified based on feedback received from said transceivers and to output an estimate information; or ATW feedback analyzer configured to receive feedback about the ATW from said other transceivers, and to estimate based on such feedback whether the ATW should be retained as in current operation or modified based on feedback received from said transceivers; and an ATW estimator configured to receive the estimate information of the ATW performance analyzer, to retain the current ATW unmodified if that is the estimate of the ATW performance analyzer and to communicate such retention to the transmission controller, and to modify the current ATW if that is the estimate information of the ATW performance analyzer and to communicate the modified ATW to a flow controller; wherein said flow controller is configured to receive the modified ATW from the ATW estimator, and to communicate the modified ATW to the transmission controller. The system id adapted to carry out respective methods.