Full-Duplex WLAN MAC Control for Simultaneous Transmission and Reception
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Solution Overview
Problem
Traditional wireless local area networks (WLANs) are not configured to transmit and receive simultaneously within the same communication channel due to self-interference, limiting their throughput and efficiency.
Innovation Solution
Implementing duplex transmission methods in WLANs, where communication devices can simultaneously transmit and receive via the same wireless frequency band by receiving an indication for duplex transmission and synchronizing packet transmission and reception within a transmit opportunity period (TXOP), using integrated circuit devices and media access control (MAC) protocol data units (MPDUs) to manage communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional WLAN devices transmit and receive simultaneously within the same communication channel, then throughput and efficiency are improved, but self-interference occurs between transmission and reception
Solution Approach 1:
The patent segments the communication channel into separate frequency bands for transmission and reception. The receiver tunes to a first frequency band to receive signals while the transmitter operates on a second frequency band, dividing the communication process into distinct frequency segments to avoid self-interference while maintaining simultaneous operation capability
Solution Approach 2:
The patent transitions from time-division multiplexing (half-duplex) to frequency-division multiplexing (full-duplex) by adding a frequency dimension to the communication channel. This allows simultaneous transmission and reception by operating in different frequency dimensions rather than alternating in time
2Reliability
If WLAN devices use half-duplex communication methods, then self-interference is avoided, but data exchange speed and efficiency are reduced
Solution Approach 1:
The patent implements dynamic frequency tuning where the receiver dynamically adjusts its tuning frequency based on the transmitter's operating frequency. This dynamic adaptation allows the system to maintain full-duplex operation while avoiding interference, combining the stability of controlled operation with the speed of simultaneous communication
Solution Approach 2:
The system uses feedback mechanisms where the receiver detects the transmitter's frequency and provides information to adjust the receiver's tuning accordingly. This feedback loop enables coordinated full-duplex operation that maintains communication stability while achieving higher data exchange speeds
Data Source
AI summary
A first communication device receives an indication that a second communication device permits a duplex transmission while the second communication device transmits during a transmit opportunity period (TXOP), where duplex transmissions involve simultaneously transmitting and receiving via a same wireless frequency band. The indication is included in a media access control layer (MAC) protocol data unit (MPDU). In response to receiving the indication that the second communication device permits the duplex transmission, the first communication device determines that the first communication device is permitted to perform the duplex transmission during the TXOP. The first communication device receives a first packet from the second communication device during the TXOP, and transmits a second packet while the first communication device is receiving the first packet.