Block ACK Control Field for Wireless LAN Throughput
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Solution Overview
Problem
In wireless communication systems, particularly in IEEE 802.11n environments, the efficiency of data transmission is hindered by the increase in control information size relative to data frames, leading to reduced system throughput, and existing aggregation methods do not effectively manage acknowledgments, impacting channel usage efficiency.
Innovation Solution
A method and apparatus for transmitting downlink physical layer protocol data units (PPDUs) that include block acknowledgments (ACKs) across multiple channels, with a block ACK transmission control field specifying transmission resources and policies for immediate or delayed ACKs, allowing efficient resource allocation and acknowledgment management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data aggregation transmission is used to reduce control information size, then transmission throughput is enhanced, but the relative size of control information increases compared to data frames
Solution Approach 1:
The patent combines multiple individual ACK transmissions into a single block ACK frame that acknowledges multiple downlink data frames simultaneously. This merging of acknowledgment functions reduces the total number of control frames transmitted, thereby reducing the relative control information size while maintaining efficient throughput through data aggregation transmission.
2Reliability
If individual acknowledgments are transmitted for each reception frame, then acknowledgment accuracy is maintained, but channel usage efficiency decreases
Solution Approach 1:
The patent merges multiple individual acknowledgment functions into a single block ACK frame that can acknowledge multiple downlink data frames. This single frame maintains accurate acknowledgment information for each received frame while significantly improving channel usage efficiency by reducing the number of control frame transmissions required.
3Productivity
If block ACK transmission control fields are added to manage acknowledgments, then acknowledgment management efficiency is improved, but frame structure complexity increases
Solution Approach 1:
The patent segments the block ACK transmission control into distinct fields within the frame structure, including a transmission resource field for channel allocation and an ACK policy field for immediate or delayed acknowledgment modes. This segmentation organizes the control information systematically, improving management efficiency while keeping the structure manageable through clear field separation.
Data Source
AI summary
Disclosed are a method and an apparatus for receiving a frame. A method for receiving a frame in a wireless LAN comprises the steps of: an AP transmitting, to a plurality of STAs, a downlink PPDU including downlink data for each of the plurality of STAs, through a plurality of channels; and the AP receiving, from each of the plurality of STAs, a plurality of block ACK frames transmitted based on a block ACK transmission control field, wherein the downlink PPDU includes the block ACK transmission control field, and wherein each of the plurality of block ACK frames may include ACK information related to downlink data.