Uplink Frame Transmission Backoff Counter Management
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Solution Overview
Problem
Current wireless LAN systems face challenges in efficiently transmitting uplink frames, particularly in multi-user scenarios, due to limitations in channel access protocols and resource allocation, leading to reduced throughput and fairness in channel contention.
Innovation Solution
A method for transmitting uplink frames in a wireless LAN system, where a user station configures a backoff counter based on parameter information, suspends countdown operations upon receiving a trigger frame, and resumes upon failing to receive an acknowledgement, allowing for dynamic adjustment of contention windows to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a user station performs countdown operations based on a backoff counter configured according to first parameter information for multi-users, then channel access efficiency is improved, but if an acknowledgement frame fails to be received, the contention window grows exponentially leading to reduced throughput
Solution Approach 1:
The patent applies dynamics by making the backoff counter configuration adaptive rather than static. The user station dynamically adjusts the backoff counter based on whether an acknowledgement frame is received. When ACK is received, the station continues countdown; when ACK is not received, the station suspends countdown and reconfigures the backoff counter, creating a dynamic response to channel conditions that prevents unnecessary exponential backoff and maintains throughput stability.
Solution Approach 2:
The patent implements feedback mechanisms where the user station monitors the reception of acknowledgement frames and uses this feedback to control backoff counter operations. The feedback loop (transmission → ACK reception monitoring → backoff adjustment) enables the system to adapt to transmission outcomes, improving channel access efficiency while maintaining reliable throughput by preventing unnecessary contention window growth.
2Productivity
If a user station suspends countdown operation upon receiving a trigger frame, then resource allocation efficiency is improved, but if the station must resume countdown after transmission failure, time is lost
Solution Approach 1:
The patent applies preliminary action by having the user station suspend the countdown operation in advance upon receiving a trigger frame, before the actual uplink transmission occurs. This preliminary suspension allows the station to efficiently respond to resource allocation commands from the access point without wasting countdown increments. When transmission failure is detected (ACK not received), the station resumes countdown, minimizing time loss by only suspending when necessary and resuming promptly upon failure detection.
3Adaptability or versatility
If diverse protocols for device-to-device communication without management entity are proposed, then flexibility is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a backoff counter configuration method that works across different communication scenarios (multi-user uplink transmission, trigger-based transmission, acknowledgment-based retransmission). The same basic mechanism of configuring and managing a backoff counter serves multiple functions: initial channel access, response to trigger frames, and recovery from transmission failures, reducing the need for separate complex protocols for each scenario.
Data Source
AI summary
A method for transmitting an uplink frame in a wireless LAN system according to an embodiment of the present specification comprises the steps in which: a user STA configures a backoff counter for contention-based channel access according to first parameter information for multiple users when a first trigger frame for uplink transmission of the multiple users is received from an AP; the user STA performs a countdown operation on the basis of the backoff counter configured according to the first parameter information; the user STA interrupts the countdown operation in order to transmit a trigger-based uplink frame in response to a second trigger frame when the second trigger frame is received; and the user STA resumes the countdown operation, which has been interrupted, when an ACK frame corresponding to the trigger-based uplink frame is not received.