Simultaneous Transmit Receive WLAN Access Point
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Solution Overview
Problem
In wireless local area networks (WLANs), existing multiple access schemes like CSMA/CA face challenges with collisions when multiple stations attempt to transmit simultaneously, leading to unsuccessful communications and inefficiencies due to the need for separate transmission and reception processes, which can be costly and inefficient in terms of implementation area and energy consumption.
Innovation Solution
The implementation of a mechanism that enables simultaneous transmission and reception (STAR) in WLANs, allowing for the transmission of data items like RTS frames while receiving other data items, with collision detection and aggressive retransmission strategies to optimize channel access, reducing the need for separate RF chains and improving throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate transmission and reception processes are used in WLAN, then implementation area and cost are reduced, but channel usage efficiency and throughput deteriorate due to inability to transmit and receive simultaneously
Solution Approach 1:
The patent combines transmission and reception operations into a single time interval by enabling the transceiver to simultaneously transmit first information (RTS frame) and receive second information (ACK frame) using the same antenna, thereby improving channel usage efficiency without requiring separate RF chains
Solution Approach 2:
The patent makes a single antenna perform multiple functions by enabling it to both transmit and receive signals simultaneously through the STAR mechanism, eliminating the need for separate transmit and receive antennas or RF chains
2Reliability
If CSMA/CA scheme is used to avoid collisions, then communication reliability improves, but channel access efficiency deteriorates due to random delays and separate transmission processes
Solution Approach 1:
The patent enables continuous channel utilization by allowing the transceiver to transmit RTS frames and receive ACK frames simultaneously without interruption, eliminating the idle periods that occur in traditional CSMA/CA where the transceiver must switch between transmission and reception modes
Solution Approach 2:
The patent dynamically adjusts the transceiver operation mode from traditional half-duplex CSMA/CA to simultaneous transmit-and-receive (STAR) mode, enabling adaptive full-duplex communication that improves channel access efficiency while maintaining collision avoidance through preamble detection
3Device complexity
If multiple transceivers share a common antenna, then implementation area and cost are reduced, but simultaneous transmission and reception capability deteriorates without STAR mechanism
Solution Approach 1:
The patent changes the operational parameters of the transceiver by enabling simultaneous transmission and reception on the same antenna through the STAR mechanism, allowing full-duplex communication that improves productivity without increasing device complexity
Solution Approach 2:
The patent adds the dimension of time overlap by enabling transmission and reception to occur in the same time interval simultaneously, transforming the traditional sequential operation into parallel operation that improves channel usage efficiency
Data Source
AI summary
A method and apparatus for optimizing channel access by an access point (AP) in a wireless local area network is provided, the method comprises transmitting first information to a station, and receiving second information from the station while transmitting the first information to the station, wherein the first information and the second information includes at least one of a request to send (RTS) frame, clear to send (CTS) frame, acknowledgement information, and data, respectively.