Multi-AP Joint Transmission Using MAC-Only Backhaul Coordination
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Solution Overview
Problem
In multi-access point (multi-AP) wireless LAN systems, efficient joint transmission (JTX) of PPDUs by multiple APs is hindered by the need for synchronization and advanced channel sounding, and the existing backhaul data rate requirements are high, limiting throughput and applicability.
Innovation Solution
A communication device and method that minimizes backhaul data rate requirements by transferring MAC layer information from a master AP to slave APs via wireless or DS backhaul, enabling coordinated joint transmission with reduced redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If joint transmission (JTX) of PPDUs by multiple APs is implemented to increase coverage and reception quality, then reception quality is improved, but backhaul data rate requirements increase
Solution Approach 1:
The patent segments the backhaul data transmission by separating MAC layer information from PHY layer information. Only essential MAC layer information (A-MSDUs and basic control information) is transmitted over the backhaul link, while detailed PHY layer parameters are generated locally at each AP. This segmentation reduces the backhaul data rate requirements while maintaining joint transmission capability for improved reception quality.
Solution Approach 2:
The patent extracts and removes redundant information from the backhaul transmission. By taking out only the necessary MAC layer information and eliminating the need to transmit complete PHY layer data over the backhaul, the solution reduces backhaul data rate requirements while preserving the essential functionality for coordinated joint transmission.
2Stability of the object's composition
If synchronization and advanced channel sounding are implemented for multi-AP joint transmission, then transmission coordination is improved, but system complexity increases
Solution Approach 1:
The patent enables each AP to autonomously generate its PHY layer parameters and perform local signal processing based on received MAC layer information. This self-service approach allows APs to independently coordinate their transmissions without requiring complex centralized control, thereby improving transmission coordination while reducing overall system complexity.
Solution Approach 2:
The patent performs preliminary MAC layer processing and information exchange before the actual PHY layer transmission. By pre-establishing the necessary coordination information at the MAC layer, the system simplifies the subsequent PHY layer operations and reduces the complexity of real-time synchronization during joint transmission.
3Manufacturing precision
If complete PHY layer information is transmitted over backhaul for joint transmission, then transmission accuracy is improved, but backhaul bandwidth consumption increases
Solution Approach 1:
The patent applies local quality by allowing each AP to independently generate and optimize its own PHY layer parameters based on local channel conditions and received MAC information. This local processing ensures transmission accuracy is maintained at each AP while avoiding the need to transmit complete PHY layer information over the backhaul, thereby reducing bandwidth consumption.
Data Source
AI summary
The present disclosure presents an efficient backhaul operation that minimizes data rate requirements of the backhaul. Backhaul information is transmitted from a master AP to one or more slave APs for joint transmission from the one or more slave APs to an STA in coordination with a transmission from the master AP to the STA.