VHT Channel Access Method for 1 Gbps Throughput
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Solution Overview
Problem
Current IEEE 802.11n WLAN systems are limited in achieving a data processing speed of 1 Gbps or more due to their single STA architecture and inefficient channel access methods, such as CSMA/CA, which result in low throughput and increased overhead, making it difficult to support higher data rates and longer communication distances.
Innovation Solution
A new channel access method for VHT systems using a bonding channel consisting of multiple subchannels, where RTS and CTS frames are transmitted across selected subchannels, allowing for efficient channel access even when multiple STAs request access simultaneously and when legacy stations are present, thereby optimizing the usage of the bonding channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSMA/CA channel access method is used in IEEE 802.11n systems, then backward compatibility and basic channel access are maintained, but throughput is limited and overhead increases
Solution Approach 1:
The patent segments the bonding channel into multiple subchannels and allows different STAs to access different subchannels simultaneously. This segmentation enables parallel transmissions, increasing aggregate throughput while maintaining manageable access complexity through structured subchannel allocation
Solution Approach 2:
The patent introduces a new dimension to channel access by allowing simultaneous access across multiple frequency subchannels rather than sequential access on a single channel. This dimensional expansion from single-channel to multi-subchannel access enables higher throughput without proportionally increasing access complexity
2Productivity
If single STA architecture is used, then device simplicity is maintained, but data processing speed cannot reach 1 Gbps or more
Solution Approach 1:
The patent merges multiple STAs' transmissions across different subchannels into a coordinated multi-STA architecture. By combining resources and coordinating access across multiple stations simultaneously, the system achieves 1 Gbps+ data processing speeds while managing complexity through structured subchannel allocation
Solution Approach 2:
The patent creates a multi-functional STA architecture where multiple STAs can perform channel access simultaneously on different subchannels. This universal access capability allows the system to handle diverse traffic loads and achieve high data processing speeds through parallel operations
3Productivity
If bonding channel with multiple subchannels is used, then throughput capacity increases, but channel access coordination becomes more complex
Solution Approach 1:
The patent applies local quality by assigning specific subchannels to specific STAs based on their needs and channel conditions. This localized allocation optimizes throughput for each STA while simplifying coordination through structured, non-conflicting subchannel assignments rather than requiring complex real-time arbitration
4Reliability
If RTS/CTS handshaking is performed on each subchannel separately, then collision avoidance is improved, but overhead increases
Solution Approach 1:
The patent merges the RTS/CTS handshaking operations across multiple subchannels by allowing coordinated handshaking where a single RTS/CTS exchange can reserve multiple subchannels simultaneously. This reduces the number of separate handshaking operations needed while maintaining collision avoidance through coordinated subchannel reservation
Data Source
AI summary
A method for transmitting data in a wireless communication system, the method includes transmitting, by a first station, a plurality of request to send (RTS) frames to a second station through a plurality of subchannels, each of the plurality of RTS frames being transmitted through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth; receiving, by the first station, at least one clear to send (CTS) frame in response to at least one of the plurality of RTS frames from the second station through at least one idle subchannel of the plurality of subchannels; and transmitting, by the first station, a data frame to the second station after receiving the at least one CTS frame, wherein each of the plurality of RTS frames includes first channel information related to the plurality of subchannels.