Block Acknowledgement for Aggregated PPDU in Multi-Subchannel Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in acknowledging data frames received in multiple subchannels, particularly due to the need to transmit individual ACK and NACK frames in each subchannel.
Innovation Solution
A block ACK scheme is introduced, where a STA responds with a single block ACK frame in one subchannel, containing ACK information for multiple subchannels, thereby avoiding the need for individual ACK and NACK frames in each subchannel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual ACK and NACK frames are transmitted in each subchannel, then acknowledgment reliability is improved, but channel utilization deteriorates and latency increases
Solution Approach 1:
The patent combines multiple individual ACK/NACK frames into a single block ACK frame that contains acknowledgment information for multiple subchannels. This merging approach maintains acknowledgment reliability by providing comprehensive feedback while improving channel utilization by reducing the total number of frames transmitted and freeing up subchannels for data transmission.
Solution Approach 2:
The block ACK frame serves as a universal acknowledgment mechanism that can acknowledge data frames across multiple subchannels simultaneously. This multi-functional approach replaces the need for separate ACK/NACK frames in each subchannel, thereby improving channel utilization while maintaining reliable acknowledgment coverage.
2Reliability
If individual ACK and NACK frames are transmitted in each subchannel, then acknowledgment completeness is improved, but latency increases
Solution Approach 1:
The patent merges multiple acknowledgment transmissions into a single block ACK frame sent in one subchannel. This reduces latency by eliminating the time required to transmit separate ACK/NACK frames in each subchannel, while maintaining acknowledgment completeness through the consolidated feedback mechanism that covers all subchannels.
Solution Approach 2:
The block ACK frame is prepared to contain acknowledgment information for multiple subchannels in advance, allowing the receiving station to provide comprehensive feedback in a single transmission rather than waiting to send individual acknowledgments sequentially, thereby reducing overall latency.
3Measurement precision
If multiple individual ACK frames are transmitted, then feedback accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple individual ACK frames into a single block ACK frame that consolidates acknowledgment information for multiple subchannels. This reduces frame management complexity by handling one frame instead of multiple frames, while maintaining feedback accuracy through the structured inclusion of subchannel-specific acknowledgment bits within the block ACK frame.
Data Source
AI summary
An embodiment is method performed by a first wireless device in a wireless network to implement a block acknowledgement (ACK) scheme for acknowledging data frames received in multiple subchannels. The method includes receiving a plurality of data frames from a second wireless device in a plurality of subchannels, transmitting a block ACK frame to the second wireless device in one of the plurality of subchannels, wherein the block ACK frame includes ACK information for the plurality of subchannels, and wirelessly transmitting one or more data frames to the second wireless device in one or more of the plurality of subchannels, wherein the block ACK frame and the one or more data frames are transmitted simultaneously in different subchannels. The block ACK scheme may improve channel utilization, throughput, and/or latency in the wireless network.