STA Uplink Transmission via Trigger Frame Thresholds
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Solution Overview
Problem
In wireless LAN systems, especially in M2M communication scenarios with a large number of devices, existing technologies face challenges in efficiently performing uplink transmission due to increased channel access time and power consumption, particularly when the number of devices grows, leading to potential interference and inefficient data transfer.
Innovation Solution
A method where a station (STA) performs uplink transmission irrespective of the CCA result if the NAV is idle and the resource size or data size is smaller than a threshold indicated by the trigger frame, allowing transmission immediately after receiving the trigger frame, thereby optimizing channel access and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the STA performs CCA operation before uplink transmission, then channel access reliability is improved, but channel access time and power consumption increase
Solution Approach 1:
The patent changes the parameter of CCA operation by introducing a threshold value for received signal strength. When the signal strength is below the threshold, the STA skips CCA operation. This parameter-based decision mechanism resolves the contradiction by adapting channel access behavior to actual channel conditions, reducing unnecessary CCA operations while maintaining reliability when needed.
Solution Approach 2:
The STA uses the trigger frame information (threshold value and resource allocation) to make autonomous decisions about whether to perform CCA. This self-service mechanism allows the STA to independently determine channel access strategy based on received parameters, eliminating the need for complex centralized control and reducing overall channel access time.
2Object-affected harmful factors
If the STA performs CCA operation before uplink transmission, then interference detection is improved, but power consumption increases
Solution Approach 1:
The patent introduces a received signal strength threshold parameter from the trigger frame to determine whether CCA operation is necessary. When the threshold indicates low interference risk, the STA skips CCA, thereby reducing power consumption while maintaining adequate interference detection capability when needed.
Solution Approach 2:
Instead of always performing full CCA operation, the STA performs partial action (skipping CCA) when conditions permit, based on the threshold comparison. This partial action approach reduces power consumption while maintaining sufficient interference detection for critical scenarios.
3Reliability
If the STA waits for channel availability before transmission, then transmission reliability is improved, but uplink transmission efficiency decreases
Solution Approach 1:
The patent uses the threshold parameter in the trigger frame to dynamically adjust transmission behavior. When the received signal strength is below the threshold, the STA transmits immediately without waiting for channel availability confirmation, thereby improving uplink transmission efficiency while maintaining acceptable reliability through the threshold-based decision mechanism.
4Area of stationary object
If the number of devices increases in M2M communication, then network coverage is improved, but channel access efficiency and power consumption are worsened
Solution Approach 1:
The patent enables each STA to independently evaluate channel conditions using the threshold parameter and make autonomous transmission decisions. This decentralized parameter-based approach scales efficiently with the number of devices, maintaining channel access efficiency even as network coverage expands to include more devices in M2M communication scenarios.
Data Source
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AI summary
One embodiment of the present invention relates to a method by which a station (STA) performs uplink transmission in a wireless communication system, the method for performing uplink transmission comprising the steps of: receiving a trigger frame from an AP; and performing uplink transmission as a response to the trigger frame, wherein, when a network allocation vector (NAV) of the STA receiving the trigger frame is idle and clear channel assessment (CCA) result is idle, the uplink transmission is performed.