Multi-User Block Ack Frame for WLAN Efficiency
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Solution Overview
Problem
Conventional ACK frame transmission methods in WLAN systems supporting Multi-User MIMO are inefficient when multiple stations access the channel simultaneously, as they are based on single-station data frame exchange conditions, leading to unreliable data transmission.
Innovation Solution
A method and apparatus for transmitting a Multi-User (MU) block ACK frame that includes multiple block ACKs for multiple stations, with a BA control field indicating transmission status, order, and duration, and an additional BA field for subsequent ACKs, allowing simultaneous ACK transmission to multiple stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ACK frame transmission methods are used in WLAN systems supporting Multi-User MIMO, then the system can support multiple stations accessing the channel simultaneously, but the ACK transmission becomes inefficient and unreliable because it is based on single-station data frame exchange conditions
Solution Approach 1:
The patent segments the ACK transmission by introducing a Block Ack mechanism that divides ACK acknowledgments into blocks, where each block ACK frame acknowledges multiple data frames from multiple stations. This segmentation allows efficient handling of multi-user MIMO scenarios by grouping ACKs rather than transmitting individual ACKs for each data frame, thereby improving reliability in multi-user environments.
2Adaptability or versatility
If conventional ACK frame transmission methods are used in WLAN systems supporting Multi-User MIMO, then the system can support multiple stations accessing the channel simultaneously, but the transmission efficiency and throughput are reduced
Solution Approach 1:
The patent merges multiple ACK transmissions into a single Block Ack frame that can acknowledge data frames from multiple stations simultaneously. By combining multiple individual ACK transmissions into one consolidated Block Ack frame, the system reduces overhead and improves network throughput while maintaining support for multi-user MIMO operations.
3Reliability
If individual ACK frames are transmitted to multiple stations separately, then each station can receive acknowledgment, but the channel access efficiency is reduced and transmission overhead increases
Solution Approach 1:
The patent implements preliminary action by having stations transmit their data frames in advance within a scheduled transmission opportunity, allowing the access point to collect and process multiple data frames before transmitting a consolidated Block Ack frame. This preliminary transmission of data frames enables efficient batch acknowledgment, reducing the total time required for ACK delivery compared to individual ACK transmissions.
Data Source
AI summary
The present invention relates to a method and apparatus for acknowledgement (ACK) transmission in a WLAN. A station receives a plurality of data frames from a plurality of other stations and then transmits an ACK for the plurality of data frames to the plurality of stations. The ACK is a multi-user (MU) block ACK frame which includes a plurality of block ACKs for the plurality of stations. One block ACK includes at least one ACK for at least one data frame that is received from one station.