Multi-STA Block ACK Frame Segmentation for WLAN Overhead Reduction
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Solution Overview
Problem
In IEEE 802.11ax wireless LAN systems, the efficient transmission of ACK signals for multiple users is hindered by increased overhead due to the large size of multi-STA Block ACK (BA) frames, and the capacity of these frames is limited, particularly in uplink multi-user transmission scenarios.
Innovation Solution
The method involves transmitting a multi-STA BA frame with a BA control field that indicates the number of included BA information pieces and information about a succeeding ACK frame, allowing for flexible acknowledgement signal transmission by splitting BA information across multiple frames and adjusting the ACK policy, with specific bit configurations to optimize frame size and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of multi-STA Block ACK frame is increased to acknowledge multiple stations, then the acknowledgement capacity is improved, but the overhead increases
Solution Approach 1:
The patent segments the multi-STA Block ACK frame into multiple smaller frames by introducing a frame number field and a most significant bit (MSB) in the BA control field. This allows the acknowledgment of multiple stations to be divided across multiple frames (first M-BA frame, second M-BA frame, etc.), reducing the overhead of any single frame while maintaining the ability to acknowledge a large number of stations across the segmented frames.
2Ease of manufacture
If conventional multi-TID BA frame is reused, then implementation simplicity is improved, but the capacity limitation becomes a problem
Solution Approach 1:
The patent embeds additional information fields within the existing multi-TID BA frame structure. Specifically, it introduces a frame number field and modifies the BA control field by setting the most significant bit (MSB) to indicate multi-frame operation. This nesting approach allows the system to maintain compatibility with conventional multi-TID BA frames while embedding the capability for extended capacity through multi-frame segmentation, thus achieving both implementation simplicity and increased capacity.
Data Source
AI summary
Disclosed are a method and a device by which an access point (AP) transmits a block ACK (BA) signal for transmission data of a plurality of stations (STAs) in a wireless LAN (WLAN) system. To this end, an AP receives data from a plurality of STAs, and transmits a first multi-STA BA frame (M-BA frame) for the data received from the plurality of STAs, wherein the first M-BA frame includes a MAC header field, a BA control field, and a BA information field, a last N bit of the BA control field indicates at least one from among the number of pieces of BA information included in the first M-BA frame and information on a succeeding ACK frame, and N is set to 5 or more.