WLAN Transmission Device Sub-Frame Feedback Mechanism
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Solution Overview
Problem
The IEEE802.11 standard's A-MPDU method for packet transmission in WLANs is prone to communication disruptions due to environmental fluctuations, particularly when mobility and interference occur, leading to potential packet loss and failure in receiving data correctly, as adjustments to transmission parameters cannot be made in real-time based on changing reception environments.
Innovation Solution
Implementing a communication system that uses full-duplex wireless terminals to transmit response signals with feedback parameters, allowing for periodic adjustments of transmission parameters during packet reception, enabling improved reception environments and reducing interference by interrupting and re-transmitting data frames with new parameters when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If A-MPDU method is used to transmit multiple sub-frames as one big data frame, then packet communication efficiency is improved, but the time required for packet transmission increases making the system more vulnerable to communication environment fluctuations
Solution Approach 1:
The patent divides the transmission process into individual sub-frame units, allowing each sub-frame to be transmitted, acknowledged, and potentially retransmitted independently. This segmentation enables the system to maintain efficiency through batch processing while improving reliability by isolating failures to individual sub-frames rather than the entire aggregate packet.
Solution Approach 2:
The patent implements dynamic adjustment of transmission parameters based on real-time feedback from Block Ack signals. The transmitter can adaptively modify transmission power, modulation schemes, or coding rates for subsequent sub-frames based on reception conditions, allowing the system to optimize between efficiency and reliability according to current channel quality.
2Reliability
If transmission parameters are adjusted based on reception environment feedback, then packet reception reliability is improved, but transmission parameter adjustment cannot be made in real-time under current standard
Solution Approach 1:
The patent prepares multiple transmission parameter configurations in advance, allowing the transmitter to quickly switch between pre-defined parameter sets based on feedback conditions. This eliminates the need for real-time parameter calculation and enables rapid adaptation to changing reception environments while maintaining reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the receiver sends Block Ack signals containing reception status information back to the transmitter. This feedback loop enables the transmitter to adjust transmission parameters for subsequent sub-frames based on actual reception conditions, improving reliability while maintaining relatively fast response times through the structured feedback protocol.
3Productivity
If transmission continues without interruption to maintain efficiency, then productivity is improved, but communication may be disabled under crowded environment with frequent packet collision
Solution Approach 1:
The patent implements periodic transmission interruption based on feedback reception. The transmitter periodically checks for Block Ack signals and reception environment conditions, and temporarily interrupts transmission when collisions or poor conditions are detected. This periodic monitoring and interruption strategy maintains overall efficiency while providing adaptability to crowded environments by pausing when necessary.
Data Source
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AI summary
The present disclosure relates to a transmission apparatus and a transmission method, a reception apparatus and a reception method, and a communication system that make it possible to implement stabilized communication irrespective of a fluctuation of a communication environment in a WLAN (Wireless LAN, WaveLAN). When a transmission apparatus transmits a data signal to a reception apparatus, the reception apparatus returns a response signal including a feedback parameter (FP) to the transmission apparatus. In a case where a reception situation of the reception apparatus is poor and improvement of it is necessitated on the basis of the FP, the transmission apparatus adjusts transmission power or the like to improve the reception situation of the reception apparatus. The present disclosure can be applied to a communication system in a WLAN.