Uplink MU-MIMO Channel Reservation for Delay Reduction
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Solution Overview
Problem
In uplink MU-MIMO technology, stations face long transmission delays and high network overhead due to contention for transmission resources, leading to poor user experience and wastage of time-frequency resources.
Innovation Solution
A method where a first station requests resource reservation, and an access point notifies multiple stations to send uplink data simultaneously, allowing them to transmit without contending for resources, using channel reservation request and response frames to manage transmission resources efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If stations contend for transmission resources using RTS/CTS frames in uplink MU-MIMO, then transmission resource allocation is achieved, but transmission delay increases and time-frequency resources are wasted
Solution Approach 1:
The access point performs preliminary channel measurement and station grouping before actual data transmission. By pre-establishing the MU-MIMO transmission groups and allocating resources in advance, the system eliminates the need for stations to contend for resources at transmission time, thereby reducing transmission delay and improving resource utilization efficiency
Solution Approach 2:
The access point autonomously measures channel quality, groups stations, and allocates transmission resources without requiring stations to actively request or compete for resources. This self-service mechanism allows the AP to efficiently manage uplink MU-MIMO transmissions, reducing both delay and resource waste
2Reliability
If the access point waits for a preset quantity of RTS frames before instructing stations to send data, then resource allocation is coordinated, but transmission delay increases
Solution Approach 1:
The access point performs channel measurement and station grouping in advance, before data transmission begins. This preliminary coordination eliminates the need to wait for multiple RTS frames, as the AP already has the necessary channel state information to efficiently allocate resources
Solution Approach 2:
The system dynamically adapts the number of stations in each MU-MIMO transmission group based on real-time channel conditions, rather than requiring a fixed number of RTS frames. This dynamic approach maintains reliable resource allocation while reducing transmission delay
Data Source
AI summary
The present invention discloses a data transmission method and apparatus. The method includes: receiving a channel reservation request frame sent by a first station, where the channel reservation request frame is used to request to reserve a transmission resource for the first station for sending uplink data; sending a channel reservation response frame to the first station and M second stations according to the channel reservation request frame, where the channel reservation response frame is used to indicate that the first station and the M second stations are allowed to send uplink data. According to the data transmission method and apparatus of the embodiments of the present invention, time-frequency resources of a system can be reduced when MU-MIMO is implemented, a transmission delay can be shortened, and user experience can be improved.