WLAN Channel Access via Multi-Subchannel RTS Probing
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Solution Overview
Problem
The existing WLAN systems face challenges in efficiently managing channel access in environments with varying channel characteristics, particularly when using narrow frequency bands, which affects data transmission reliability and throughput.
Innovation Solution
A method for channel access in WLAN systems that involves transmitting RTS frames over multiple subchannels, receiving CTS frames, and selecting the subchannel with the best Signal to Noise Ratio (SNR) for data transmission, while using remaining subchannels for null data frames, thereby improving data transmission reliability and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single channel access method is used in WLAN systems with varying channel characteristics, then the system is simple to operate, but data transmission reliability deteriorates
Solution Approach 1:
The patent divides the channel access process into multiple stages: first transmitting RTS frames over multiple subchannels to probe channel conditions, then selecting the best subchannel for data transmission based on received CTS frames. This segmentation allows the system to evaluate multiple channels before committing to data transmission, improving reliability without requiring complex continuous monitoring throughout the entire transmission process.
Solution Approach 2:
The patent implements preliminary channel probing by transmitting RTS frames over multiple subchannels before actual data transmission. The receiver responds with CTS frames that contain channel quality information, allowing the transmitter to pre-determine the best subchannel. This preliminary action eliminates the need for complex real-time channel adaptation during data transmission, resolving the contradiction between reliability and complexity.
2Productivity
If channel access is performed without subchannel selection, then the operation is simple, but throughput deteriorates in environments with significant channel characteristic variations
Solution Approach 1:
The patent implements self-service channel selection where the transmitter automatically probes multiple subchannels and selects the best one based on CTS frame feedback without requiring manual intervention or complex external control. The system autonomously evaluates channel conditions and makes decisions about which subchannel to use for data transmission, maximizing throughput while maintaining operational simplicity through automation.
3Reliability
If multiple subchannels are probed for channel access, then data transmission reliability improves, but the time required for channel access increases
Solution Approach 1:
The patent maintains continuous channel probing across multiple subchannels during the RTS-CTS exchange phase, ensuring that channel quality information is gathered from all available subchannels before data transmission begins. This continuous probing approach ensures reliable subchannel selection while the parallel nature of the RTS-CTS exchange minimizes time overhead compared to sequential evaluation methods.
Data Source
AI summary
A method for channel access in a wireless local area network is provided. The method includes: transmitting, a plurality of Request To Send (RTS) frames over a plurality of subchannels to a receiver, each RTS frame being transmitted over each of the plurality of subchannels; receiving at least one Clear To Send (CTS) frame over at least one subchannel among the plurality of subchannels from the receiver; each CTS frame being transmitted over each of the at least one subchannel, transmitting a data unit to the receiver. The data unit includes at least one data frame. The at least one data frame is transmitted over at least one selected subchannel among the at least one subchannel, each data frame being transmitted over each selected subchannel.