MU-MIMO Data Protection via VHT RTS Marker
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in protecting MU-MIMO data through RTS and CTS frame exchanges, particularly in VHT WLAN systems, which can lead to resource wasting and reduced throughput due to channel contention and compatibility issues with existing systems.
Innovation Solution
A method is proposed to efficiently protect MU-MIMO data by transmitting RTS frames with a VHT data marker and setting specific durations for RTS and CTS frames, allowing for simultaneous data transmission and reception between APs and multiple wireless STAs without modifying the existing control frame format, ensuring backward compatibility and improved throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RTS and CTS frame exchange is used to protect MU-MIMO data in VHT WLAN systems, then data transmission reliability is improved, but channel contention and resource wasting occur due to compatibility issues with existing systems
Solution Approach 1:
The patent introduces a VHT data marker parameter in the RTS frame to distinguish VHT MU-MIMO data transmission from traditional transmissions. This parameter change enables receiving stations to identify and reserve resources for MU-MIMO transmissions without requiring fundamental changes to the RTS/CTS exchange mechanism, thereby maintaining reliability while reducing resource waste from unnecessary frame exchanges
2Reliability
If RTS and CTS frame exchange is used to protect MU-MIMO data, then data protection is achieved, but system complexity increases due to multiple frame exchanges
Solution Approach 1:
The patent segments the data transmission protection mechanism by introducing a specific VHT data marker that identifies MU-MIMO transmissions. This segmentation allows the system to apply simplified protection rules specifically for VHT MU-MIMO frames rather than requiring complex multi-frame exchange sequences for all transmissions, reducing overall system complexity while maintaining data protection
3Adaptability or versatility
If existing control frame format is used for RTS/CTS exchange, then backward compatibility is maintained, but MU-MIMO data protection efficiency is reduced
Solution Approach 1:
The patent applies local quality by modifying only specific fields (introducing the VHT data marker) in the RTS frame while maintaining the overall control frame format structure. This localized modification enables MU-MIMO data protection efficiency improvements without affecting backward compatibility, as legacy stations continue to recognize and process the frames according to existing formats
Data Source
AI summary
The present invention relates to a method for protecting MU-MIMO (Multi User-Multiple Input Multiple Output) data through a multi-RTS/CTS frame exchange in a MU-MIMO based wireless communication system. The method of the present invention comprises: a process where an indicator for VHT data protection is added to an RTS frame, using the structure of an RTS/CTS frame for an existing legacy terminal during the multi RTS/CTS frame exchange; a process where an access point designates and then transmits the duration period of the RTS frame while transmitting the RTS frame; and a process where wireless terminals up to the (n−1)th terminal designate the duration period of the CTS frame as ‘0’ and send the designated duration period, while only the n-th wireless terminal designates NAV for data protection.