Access Point Station Group Management for MU-MIMO Signaling
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Solution Overview
Problem
Managing and maintaining groups of stations in multi-user multiple-input multiple-output (MU-MIMO) systems is challenging, particularly in efficiently establishing, maintaining, and deleting station-management groups to optimize resource allocation and minimize signaling overhead.
Innovation Solution
An access point configures and manages station-management groups by transmitting group allocation and deletion messages, using MU-MIMO techniques to establish and implicitly or explicitly manage groups, allowing for dynamic updates based on traffic patterns and channel conditions, and employing CSMA/CA techniques for wireless medium access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit group deletion messages are transmitted to manage station groups, then group management reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential group management function from explicit deletion messages and implements it through implicit deletion mechanisms. Instead of requiring explicit deletion signaling, the system uses the absence of group allocation messages or transmission of new group allocation messages to indicate group deletion, thereby removing the harmful signaling overhead while maintaining management reliability
Solution Approach 2:
The system enables stations to self-detect group deletion status by monitoring the presence or absence of group allocation messages from the access point. Stations automatically update their group membership status based on these observations without requiring explicit deletion notifications, eliminating the need for separate deletion signaling
2Adaptability or versatility
If frequent group updates are performed to adapt to changing conditions, then adaptability is improved, but signaling overhead increases
Solution Approach 1:
The patent implements periodic group allocation messaging where the access point transmits group allocation messages at regular intervals to maintain and update station group memberships. This periodic action enables continuous adaptation to changing channel conditions and traffic patterns while using efficient signaling that only transmits updates when necessary
Solution Approach 2:
The system dynamically adjusts group allocations based on real-time channel conditions and traffic requirements. The access point monitors system state and dynamically modifies group compositions by transmitting updated group allocation messages only when changes are needed, optimizing both adaptability and signaling efficiency
3Loss of information
If implicit group deletion is used to reduce signaling, then signaling overhead is reduced, but group management reliability may worsen
Solution Approach 1:
The patent implements feedback mechanisms where stations monitor and detect the absence of group allocation messages to determine group deletion status. The system includes confirmation procedures where stations verify deletion status through multiple observations and report back to the access point, ensuring reliable group management without explicit deletion signaling
Solution Approach 2:
The system performs preliminary verification steps before finalizing group deletion. Stations detect potential deletion through absence of allocation messages, verify this status over a predetermined period, and only then update their group membership status. This preliminary action prevents premature or erroneous deletion while maintaining signaling efficiency
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3
AI summary
Embodiments of an access point configured for station group management and a method for managing station-management groups in a wireless network are generally described herein. In some embodiments, the access point may transmit a group allocation message to selected stations and establish a station-management group to include stations from which response frames are received. The access point may also transmit DL MU-MIMO transmissions to the stations of the station-management group using a MU-MIMO technique. When explicit group deletion is employed, the access point may explicitly delete some stations from the station-management group by transmitting a group deletion message to the stations of the group. When implicit group deletion is employed, the access point may implicitly delete some stations from the station-management group after a predetermined period of time indicated in the group allocation message by refraining from transmitting DL MU-MIMO transmissions or group update messages to the stations of the group.