Adaptive Channel Sounding for MU-MIMO Airtime Overhead Reduction
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Solution Overview
Problem
MU-MIMO systems are highly sensitive to changes in channel state, leading to significant interference and increased airtime overhead due to the need for frequent and uniform channel sounding across all users.
Innovation Solution
A network access device that dynamically identifies static user equipment by monitoring changes in channel state and reduces the channel sounding frequency for groups of static user equipment, while maintaining higher sounding frequencies for non-static equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the channel sounding frequency is increased to maintain accurate CSI, then the interference is reduced, but the airtime overhead increases
Solution Approach 1:
The patent applies local quality by differentiating the channel sounding frequency based on user mobility characteristics. Static users are assigned a lower sounding frequency while mobile users receive a higher sounding frequency, optimizing the balance between CSI accuracy and airtime overhead for each user group rather than applying a uniform frequency to all users.
Solution Approach 2:
The patent implements dynamics by making the channel sounding frequency adaptive rather than fixed. The network access device dynamically adjusts the sounding frequency based on real-time detection of user mobility status, transitioning between different frequency levels as users move between static and mobile states.
2Loss of time
If the channel sounding frequency is reduced to save airtime overhead, then the airtime overhead decreases, but the CSI accuracy deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the channel sounding frequency based on user mobility characteristics. Static users are assigned a lower sounding frequency while mobile users receive a higher sounding frequency, optimizing the balance between CSI accuracy and airtime overhead for each user group rather than applying a uniform frequency to all users.
Solution Approach 2:
The patent implements dynamics by making the channel sounding frequency adaptive rather than fixed. The network access device dynamically adjusts the sounding frequency based on real-time detection of user mobility status, transitioning between different frequency levels as users move between static and mobile states.
3Device complexity
If a uniform channel sounding frequency is applied to all users, then the system complexity is reduced, but the overall system performance deteriorates
Solution Approach 1:
The patent applies segmentation by dividing users into distinct groups based on mobility characteristics - static users and mobile users - and applying different channel sounding frequencies to each group. This segmentation allows the system to optimize performance for each user type while managing complexity through clear classification criteria.
Solution Approach 2:
The patent applies local quality by differentiating the channel sounding frequency based on user mobility characteristics. Static users are assigned a lower sounding frequency while mobile users receive a higher sounding frequency, optimizing the balance between CSI accuracy and airtime overhead for each user group rather than applying a uniform frequency to all users.
Data Source
AI summary
The present disclosure relates to a network access device and method for the same, medium and program product. A network access device, comprising: a memory storing instructions; and a processor executing at least the following operations: monitoring changes in channel state between user equipment and a network access device; storing and updating the list of static user equipment from the user equipment, wherein a monitored change in a channel state during a first time period is smaller than a first threshold; grouping two or more user equipment in the list of static user equipment into at least one first sounding group based on sounding grouping criteria; and performing channel sounding, in the absence of the list of static user equipment, for the at least one first sounding group at a second channel sounding frequency lower than a first channel sounding frequency.