Access Point Interference Measurement for Full-Duplex WiFi
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Solution Overview
Problem
Current wireless communication technologies face challenges in maximizing full-duplex data throughput due to strong transmission echo, requiring extensive media access control protocol designs and being limited by compatibility with legacy half-duplex devices.
Innovation Solution
The implementation of joint downlink and uplink transmission interference measurement operations using null-data packets (NDPs) to determine modulation and coding schemes, allowing full-duplex capable access points to communicate with half-duplex stations without requiring changes to existing WiFi standards or protocols, enabling simultaneous joint scheduling and interference measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is implemented to double data throughput, then productivity is improved, but device complexity increases due to extensive MAC protocol designs and self-interference cancellation requirements
Solution Approach 1:
The patent segments the full-duplex transmission problem into manageable components: interference measurement using NDP packets, MCS determination based on measurement results, and selective pairing of DL and UL STAs. This segmentation allows the system to implement full-duplex functionality without requiring complete redesign of the MAC protocol, thereby reducing overall system complexity while maintaining throughput benefits
Solution Approach 2:
The patent performs preliminary interference measurement using null-data packets before actual data transmission. By measuring STA-to-STA interference in advance and determining appropriate MCS levels beforehand, the system avoids complex real-time protocol adjustments during transmission, simplifying the MAC protocol design while enabling full-duplex operation
2Adaptability or versatility
If full-duplex capable AP communicates with legacy half-duplex STAs, then adaptability is improved, but measurement precision deteriorates due to inability of legacy STAs to perform simultaneous transmit and receive
Solution Approach 1:
The patent introduces the AP as an intermediary that performs the interference measurement function. The AP transmits NDP packets to DL STAs while receiving UL packets from UL STAs, and uses its own receive chain to measure the interference caused by UL transmissions on DL reception. This intermediary approach allows legacy half-duplex STAs to participate in full-duplex communication without requiring them to perform simultaneous transmit and receive operations
Solution Approach 2:
The AP performs self-measurement of interference by utilizing its own receive chain to measure the impact of UL STA transmissions on DL reception. This self-service measurement approach eliminates the need for external measurement devices or complex coordination between STAs, maintaining measurement precision while supporting legacy device compatibility
3Measurement precision
If interference measurement is performed using NDP packets during simultaneous DL and UL transmission, then measurement precision is improved, but loss of time increases due to additional measurement overhead
Solution Approach 1:
The patent merges the interference measurement function with the existing DL ACK transmission mechanism. The AP transmits NDP packets as DL data to DL STAs, and these same NDP transmissions serve dual purposes: delivering data to DL STAs and enabling interference measurement for FD-DL MCS determination. By combining these functions, the system achieves precise interference measurement without adding separate measurement overhead time
Data Source
AI summary
Methods adapted for measuring interference in joint communications and Access Points (APs) are described. The interference can be between the AP and first and second communication stations (STAs). In a method to measure interference, a first communication between the AP and the first STA can be established. Further, a second communication between the AP and the second STA can be established. The second communication can include transmitting a null data packet (NDP) to the second STA based on the first communication to measure STA-to-STA inference between the first STA and the second STA.