Wireless LAN Transmission Opportunity Control for Mixed VHT Non-VHT Stations
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Solution Overview
Problem
Current wireless LAN systems using multiple channels face challenges in providing high throughput and ensuring compatibility with both non-VHT and VHT wireless stations, leading to issues with data transmission and reception due to differences in channel support and transmission opportunity settings.
Innovation Solution
The proposed method involves a transmission opportunity setting method that considers the wireless LAN mode and number of available channels, allowing non-VHT stations to acquire transmission opportunities using the last remaining channel and adjusting data frame sizes to synchronize transmission times across multiple channels, ensuring compatibility and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple channels are used to increase data throughput, then productivity is improved, but device complexity increases due to different channel support requirements for non-VHT and VHT stations
Solution Approach 1:
The patent segments the wireless LAN system into VHT stations and non-VHT stations, allowing each group to operate on appropriate channels. VHT stations use multiple channels (including channel 160) while non-VHT stations use traditional channels, dividing the system to manage complexity while maintaining high throughput capability.
Solution Approach 2:
The patent introduces a new dimension of channel width (160 MHz) in addition to the traditional channel structure. This allows VHT stations to exploit wider channels for higher throughput while non-VHT stations continue using narrower channels, adding dimensional flexibility to resolve the contradiction between throughput and complexity.
2Productivity
If transmission opportunity settings are optimized for VHT stations, then productivity is improved, but adaptability deteriorates for non-VHT stations
Solution Approach 1:
The patent applies local quality by allowing different transmission opportunity settings for different station types. VHT stations receive optimized transmission opportunities on 160 MHz channels for high productivity, while non-VHT stations receive appropriate transmission opportunities on traditional channels, ensuring both groups operate effectively in their respective contexts.
Solution Approach 2:
The patent creates a universal transmission opportunity framework that serves both VHT and non-VHT stations. The access point manages transmission opportunities for both station types simultaneously, making the system multi-functional to handle different channel widths and station capabilities without sacrificing adaptability.
3Productivity
If data frames are transmitted simultaneously across multiple channels, then productivity is improved, but loss of information increases due to synchronization issues
Solution Approach 1:
The patent uses preliminary action through RTS/CTS handshaking before actual data transmission. Stations perform clear channel assessment and negotiate transmission parameters in advance, ensuring synchronization is established before simultaneous multi-channel transmission begins, thereby preventing data loss while maintaining high productivity.
Solution Approach 2:
The patent implements feedback mechanisms where stations acknowledge received data frames and report transmission status. This feedback loop allows the access point to monitor synchronization across multiple channels and coordinate retransmissions if needed, maintaining data integrity while enabling simultaneous transmission for high productivity.
Data Source
AI summary
A transmission opportunity setting method in a wireless LAN system using multiple channels includes: receiving a request-to-send (RTS) frame from a wireless station, the RTS frame including information on a wireless LAN mode of the wireless station; and transmitting a clear-to-send (CTS) frame to the wireless station according to at least one of the number of remaining available channels among the multiple channels and the wireless LAN mode of the wireless station.