MU-MIMO Spatial Stream Position Assignment via Group Indicators
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Solution Overview
Problem
In Very High Throughput (VHT) WLAN systems, the existing methods for transmitting spatial streams in MU-MIMO (Multi-User Multiple Input Multiple Output) require a large number of bits to inform multiple STAs ( Stations) about spatial stream information, leading to inefficiencies in bit usage and potential increased interference.
Innovation Solution
A method and apparatus for transmitting spatial streams in a VHT WLAN system that uses management frames with group information, including group indicators and spatial stream indicators, to efficiently assign or change the position of spatial streams for each group of receivers, allowing for reduced bit usage and optimized data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If existing methods are used to transmit spatial streams in MU-MIMO, then spatial stream information can be transmitted to multiple STAs, but a large number of bits are required in the PLCP preamble, leading to inefficiency
Solution Approach 1:
The patent segments the spatial stream information transmission by dividing STAs into multiple groups, where each group is assigned to specific spatial streams. Instead of informing all STAs about all spatial streams, each STA only receives information about its assigned group's spatial streams, thereby reducing the number of bits required in the PLCP preamble while maintaining complete spatial stream information delivery to relevant STAs.
2Productivity
If group information is added to management frames to assign spatial streams, then bit usage efficiency improves, but the management frame structure becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-assigning STAs to groups and pre-configuring spatial stream mappings before actual data transmission. The management frame carries group information that establishes these assignments in advance, allowing the PLCP preamble to use compact group indicators rather than extensive spatial stream descriptions during subsequent transmissions, thereby improving overall transmission efficiency despite the initial complexity of setting up the group structure.
Data Source
AI summary
A method of transmitting a spatial stream for multi user (MU)-multiple input multiple output (MIMO) in a wireless local area network system and a transmitter for performing the method are provided. The method includes transmitting, to a receiver, a management frame including group information to assign or change a position of a plurality of spatial streams corresponding to each of a plurality of groups, and transmitting, to the receiver, a frame including at least one spatial stream, wherein the group information includes a plurality of group indicators and a plurality of spatial stream (SS) indicators, each of the plurality of group indicators indicating whether the receiver is a member of each of the plurality of groups, each of the plurality of SS indicators indicating a position of the plurality of spatial streams corresponding to each of the plurality of groups.