Multiuser Scheduling via Path-Loss Grouping in WLAN MIMO
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Solution Overview
Problem
Existing multiuser communication systems face a computational burden in determining optimal user grouping for multiuser transmissions, as current methods relying on channel state information are inefficient and complex.
Innovation Solution
A processing system that determines path-losses and transmission times to group wireless nodes into sets for efficient multi-user multiple-input and multiple-output (MIMO) transmissions, allowing for equal power allocation and reduced complexity in precoding schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel state information is used for optimal multiuser scheduling, then scheduling performance is improved, but computational complexity increases
Solution Approach 1:
The patent changes the scheduling parameter from channel state information to path-loss values. By using path-loss instead of full CSI, the system achieves simpler computations while maintaining effective multiuser scheduling performance. The processing system determines path-losses between the access point and wireless nodes, then groups nodes based on these path-loss values, reducing computational burden while preserving scheduling effectiveness.
2Reliability
If full channel state information is processed, then optimal user grouping is achieved, but hardware computational burden increases
Solution Approach 1:
The patent extracts only the essential component needed for scheduling decisions - the path-loss value - from the more complex channel state information. By taking out just the path-loss parameter, the system achieves sufficient grouping optimality without processing the entire CSI matrix, thereby reducing computational power requirements significantly.
3Reliability
If complex precoding schemes are used, then transmission performance is improved, but system complexity increases
Solution Approach 1:
The patent applies equipotentiality by grouping wireless nodes into sets with approximately equal path-loss values. This ensures that all nodes within a group experience similar transmission conditions, allowing for equal power allocation and simplifying the precoding scheme. The processing system groups nodes such that each set comprises wireless nodes with approximately equal path-losses, eliminating the need for complex power control mechanisms.
Data Source
AI summary
An apparatus for wireless communications is provided including a processing system. The processing system is configured to determine path-losses between the apparatus and a plurality of wireless nodes, to group the plurality of wireless nodes into sets based on the determined path-losses, and to exchange data with at least one of the wireless nodes in one of the sets.