MU-MIMO Receiver Group Selection via Channel Orthogonality
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Solution Overview
Problem
Current wireless local area network (WLAN) technologies face challenges in efficiently transmitting data to multiple client stations simultaneously without causing interference, as existing standards do not effectively manage orthogonality between communication channels, leading to reduced signal quality and increased interference.
Innovation Solution
A method and apparatus that select client stations for simultaneous data transmission based on the orthogonality of their communication channels with an access point, using channel descriptions to form groups that minimize interference and maximize signal-to-noise ratio by transmitting independent data streams via orthogonal or nearly orthogonal channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple client stations transmit data simultaneously through the access point, then network throughput and productivity are improved, but interference between communication channels increases and signal quality deteriorates
Solution Approach 1:
The patent applies local quality by selecting specific client stations for MU-MIMO transmission based on their individual channel characteristics. The access point evaluates channel descriptions from multiple client stations and identifies those with favorable channel properties (such as orthogonal or near-orthogonal channels) to participate in simultaneous transmission. This selective approach ensures that only client stations with compatible channel conditions are grouped together, thereby maintaining high signal quality while achieving improved network throughput through parallel transmissions.
2Reliability
If client stations are selected for MU-MIMO transmission, then signal-to-noise ratio is improved, but the complexity of channel management and client selection increases
Solution Approach 1:
The patent implements preliminary action by having client stations transmit their channel descriptions to the access point before the actual data transmission occurs. The access point uses these pre-transmitted channel descriptions to perform channel quality assessment and select the optimal subset of client stations for MU-MIMO transmission. This advance preparation allows the system to identify suitable client combinations that maximize signal-to-noise ratio while avoiding the complexity of real-time channel evaluation during data transmission, thereby improving reliability without excessive operational complexity.
Data Source
AI summary
A method in a communication network includes obtaining descriptions of a plurality of communication channels. Each communication channel is associated with a different one of a plurality of receivers. The method also includes identifying, based on the descriptions of the plurality of communication channels, two or more communication channels that satisfy one or more predetermined constraints related to orthogonality between the two or more communication channels. The method further includes selecting, to be included in a group of receivers, receivers associated with the two or more identified communication channels. The method additionally includes transmitting, to the group of receivers, at least one data unit that includes data intended for each receiver in the group.