Parallel Subband Transmission for WLAN Throughput
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Solution Overview
Problem
In wireless LAN systems with a large number of stations, channel access contention leads to collisions, reducing overall throughput, especially when operating in a band of 1 GHz or less, where service coverage is expanded but channel access efficiency is compromised.
Innovation Solution
The implementation of a Parallel Subband Transmission (PST) method, where an access point transmits a PST message indicating subband information and time periods for frame transmission to multiple stations, allowing simultaneous frame transmission and reception across multiple subbands, reducing collisions and enhancing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If WLAN systems operate in a band of 1 GHz or less to expand service coverage, then coverage area is improved, but channel access efficiency deteriorates due to increased contention and collisions
Solution Approach 1:
The patent divides the frequency band into multiple subbands and allows simultaneous frame transmission on different subbands by multiple STAs. This segmentation of the frequency resource enables parallel communications, improving channel access efficiency while maintaining the expanded coverage area provided by the 1 GHz or less operating band.
2Quantity of substance
If a large number of STAs co-exist in the WLAN system, then network capacity is improved, but collision probability increases reducing overall throughput
Solution Approach 1:
The patent introduces frequency dimension by dividing the bandwidth into multiple subbands, allowing STAs to transmit frames simultaneously on different frequency resources. This dimensional expansion enables a large number of STAs to co-exist without increasing collision probability, as each STA can be assigned to a specific subband for transmission.
3Ease of operation
If STAs conduct contention to obtain channel access authority, then fair access is improved, but transmission efficiency deteriorates due to collisions and retransmissions
Solution Approach 1:
The access point performs preliminary scheduling by determining which STAs will transmit on which subbands and when. This advance allocation of frequency resources and transmission timing eliminates the need for contention-based access, ensuring both fair distribution of channel access and high transmission efficiency without collisions.
Data Source
AI summary
The present invention relates to a method for transmitting and receiving a frame performed by an AP in a wireless communication system. The method includes the steps of: transmitting a PST message providing instructions to transmit a frame to at least one STA; and receiving frames from a first STA and a second STA. The PST message includes first subband information indicating a first subband in which a first frame is transmitted from the first STA and second subband information indicating a second subband in which a second frame is transmitted from the second STA.