Uplink Multi-User Sounding Procedure for HE WLAN
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Solution Overview
Problem
There is no specified method for performing a sounding procedure including uplink multi-user transmission in High Efficiency Wireless Local Area Networks (HEW), which limits the performance and capacity of wireless networks in environments with multiple access points and high user demand for high-capacity services.
Innovation Solution
A method and apparatus for performing a sounding procedure in HEW that involves transmitting and receiving response frames with a Modulation and Coding Scheme (MCS) determined based on trigger frames, allowing multiple users to apply the same MCS, enabling efficient uplink multi-user transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional WLAN systems increase bandwidth and peak transmission rate, then transmission capacity is improved, but user-perceived performance does not drastically increase
Solution Approach 1:
The patent segments the wireless network into multiple access points with overlapping coverage areas, allowing users to be served by the nearest or least congested AP. This segmentation transforms a single high-capacity link into multiple distributed links, improving both capacity and user-perceived performance through localized optimization.
Solution Approach 2:
The patent introduces spatial dimensionality by deploying access points in different physical locations rather than increasing bandwidth in a single dimension. This allows simultaneous service to multiple users in different locations, transforming a one-dimensional bandwidth increase into a multi-dimensional spatial distribution of capacity.
2Productivity
If multiple access points are densely deployed to support more users, then network capacity is improved, but coordination complexity increases
Solution Approach 1:
The patent merges the operations of multiple access points into a coordinated system where APs work together as a unified network. Through joint channel estimation and coordinated transmission, the system manages multiple APs as a single logical entity, reducing coordination complexity while maintaining increased network capacity.
Solution Approach 2:
The patent implements feedback mechanisms where user terminals report channel state information back to access points. This feedback enables automatic coordination and optimization of transmissions across multiple APs, allowing the system to adapt to changing conditions without complex manual coordination.
3Productivity
If uplink multi-user transmission is implemented without specified sounding procedure, then user access efficiency is improved, but transmission reliability deteriorates
Solution Approach 1:
The patent performs channel estimation and sounding procedures before actual uplink multi-user transmission. By preliminarily characterizing the channel conditions for multiple users, the system can optimize transmission parameters in advance, ensuring both efficient user access and reliable transmission without trial-and-error adjustments.
Data Source
AI summary
The present disclosure relates to a sounding procedure including uplink multi-user transmission in a High Efficiency WLAN (HEW). According to one aspect of the present disclosure, a method for transmitting a response frame by a responding Station (STA) to a transmitting STA in a wireless local area network may be provided. The method may include receiving, from the transmitting STA, a trigger frame including information related to a Modulation and Coding Scheme (MCS) for the response frame, and transmitting, to the transmitting STA, the response frame according to an MCS determined based on the information related to the MCS for the response frame included in the trigger frame. When a type of the response frame corresponds to a Multiple-User (MU) type, a same MCS may be applied to the response frame by a plurality of STAs including the STA and at least one other STA.