DL MU-MIMO Transmission Control via Channel Sounding and TxOP
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Solution Overview
Problem
The existing processing mechanism for Downlink Multiple User-Multiple Input Multiple Output (DL MU-MIMO) transmission in Wi-Fi systems is inefficient due to a long interval between channel sounding and data transmission, causing channel parameters to become outdated, which reduces the probability and efficiency of DL MU-MIMO transmission and affects Wi-Fi performance.
Innovation Solution
A method that includes performing a channel sounding procedure based on Null Data PPDU (NDP) in response to channel competition success, and determining whether to initiate DL MU-MIMO transmission based on a preset Transmission Opportunity (TxOP) duration or the busy/idle state of the channel in a first period after the sounding procedure, allowing for faster access and increased priority in channel competition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel sounding procedure based on NDP is performed separately from DL MU-MIMO transmission, then channel parameters can be obtained for subsequent transmission, but the interval between sounding and transmission becomes too long causing channel parameters to become outdated
Solution Approach 1:
The patent merges the channel sounding procedure with the DL MU-MIMO transmission opportunity by indicating that the channel sounding is performed within the TxOP duration. This combining of sounding and transmission operations eliminates the long idle interval between them, ensuring channel parameters remain valid while enabling timely data transmission.
Solution Approach 2:
The patent performs channel sounding as a preliminary action within the TxOP duration before actual data transmission begins. By completing the sounding procedure in advance within the same transmission opportunity, the system ensures fresh channel parameters are available when transmission starts, avoiding parameter obsolescence.
2Productivity
If the interval between channel sounding and DL MU-MIMO transmission is reduced, then channel parameters remain valid and transmission efficiency improves, but the system must quickly determine whether to start transmission after sounding
Solution Approach 1:
The patent introduces dynamic channel access control by monitoring channel busy/idle states during the TxOP duration and making real-time decisions about whether to proceed with transmission. This dynamic adaptation allows the system to efficiently utilize the shortened interval between sounding and transmission while managing the increased control complexity through state-based decision making.
3Reliability
If the system waits for channel parameters to remain valid before transmission, then transmission reliability improves, but transmission delays increase reducing overall performance
Solution Approach 1:
The patent ensures continuous useful action by performing channel sounding and immediately proceeding to DL MU-MIMO transmission within the same TxOP duration without idle intervals. This continuous operation maintains parameter validity while minimizing delays, as the system transitions seamlessly from sounding to transmission activities.
Solution Approach 2:
By performing channel sounding as a preliminary action within the TxOP duration before actual data transmission, the system prepares valid channel parameters in advance. This preliminary sounding ensures transmission reliability while the integrated timing prevents excessive delays, as transmission follows immediately within the same opportunity window.
Data Source
AI summary
A method and a device for performing downlink multiple user-multiple input multiple output (DL MU-MIMO) transmission, a storage medium, and a user equipment. Said method comprises: in response to a channel competition success, performing a channel sounding procedure based on NDP; according to a preset Transmission Opportunity (TxOP) duration, or according to a busy or idle state of a channel in a first period after the channel sounding procedure based on NDP, determining whether to start to perform DL MU-MIMO transmission or not. Embodiments of the present disclosure provide a solution on how to improve probability and success rate of performing DL MU-MIMO transmission, improving efficiency of DL MU-MIMO transmission and performance of Wi-Fi.