Feedback Trigger Frame Mechanism for WLAN Channel Access
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Solution Overview
Problem
In wireless local area networks (WLANs), especially in M2M communication scenarios, the increased number of devices leads to degraded system performance and power saving issues due to prolonged channel access times, affecting overall network efficiency and device battery life.
Innovation Solution
A new method for configuring a feedback trigger frame and apparatus for transmitting and receiving feedback trigger frames is introduced, optimizing channel access and power management in WLAN systems, particularly using improved NDP sounding procedures and group-based AID allocation to enhance channel access efficiency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of devices in M2M communication is increased, then network coverage and connectivity are improved, but channel access time increases and system performance degrades
Solution Approach 1:
The patent segments the channel access process by introducing a feedback trigger frame mechanism that divides the traditional contention-based access into structured phases. Devices are organized into groups that can access the channel in an orchestrated manner, reducing the random access time and collisions that occur when many devices compete simultaneously.
Solution Approach 2:
The patent implements periodic feedback trigger frames that are transmitted at regular intervals to solicit channel state information from multiple devices. This periodic structure allows the system to efficiently manage large numbers of devices by collecting feedback in organized batches rather than requiring continuous individual access, thereby reducing overall channel access time.
2Quantity of substance
If the number of devices in M2M communication is increased, then network coverage and connectivity are improved, but power consumption increases
Solution Approach 1:
The feedback trigger frame mechanism operates periodically, allowing devices to enter low-power states between feedback opportunities. Devices only need to wake up and transmit feedback at designated intervals rather than continuously monitoring and accessing the channel, significantly reducing power consumption for large numbers of devices.
Solution Approach 2:
The system enables devices to autonomously manage their power states by listening for feedback trigger frames and transmitting feedback only when prompted. This self-service approach eliminates the need for continuous active monitoring, allowing devices to conserve energy while maintaining network connectivity.
3Reliability
If traditional acknowledgment frame transmission is used, then communication reliability is maintained, but system efficiency and network speed are limited
Solution Approach 1:
The patent implements a feedback mechanism where devices transmit channel state information in response to trigger frames. This structured feedback allows the system to adapt transmission parameters dynamically, improving both reliability through better channel knowledge and efficiency by reducing redundant transmissions and optimizing data rates.
Solution Approach 2:
The feedback trigger frame mechanism serves multiple functions simultaneously: it solicits channel state information, manages channel access coordination, enables group-based communication, and optimizes transmission parameters. This multi-functionality improves system efficiency by consolidating multiple control functions into a single mechanism while maintaining communication reliability.
Data Source
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AI summary
The present invention relates to a wireless communication system and, in particular, to a method and apparatus for transmitting/receiving a feedback trigger frame in a wireless LAN system. The method for transmitting a feedback trigger frame by means of a request station (STA) in a wireless communication system according to one embodiment of the present invention includes the steps of: transmitting the feedback trigger frame including an acknowledgement (ACK) indication field to a response STA; and receiving a feedback frame from the response STA, wherein the ACK indication field can be set as a value indicating a first type associated with ACK, a second type associated with block ACK (BA), a third type associated with no ACK, or a fourth type associated with an ACK other than those of the first, second, and third types.