Wireless LAN Frame Transmission TXOP Duration Approximation
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Solution Overview
Problem
Current wireless LAN systems face challenges in precisely and efficiently configuring TXOP duration, particularly in scenarios where residual TXOP duration is not a multiple of the granularity used in the signaling field, leading to difficulties in navigating NAV settings and channel access for third-party STAs.
Innovation Solution
A method where a station calculates the residual TXOP duration based on a received frame, approximating it to the nearest multiple of the granularity for transmission, and includes this in the MAC header, allowing for precise configuration and protection of TXOP durations even for third-party STAs that do not decode the MAC header.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the STA transmits the exact residual TXOP duration value, then the TXOP duration configuration precision is improved, but the NAV setting accuracy for third-party STAs deteriorates when the value is not a multiple of granularity
Solution Approach 1:
The patent changes the parameter representation by introducing a rounded TXOP duration value that is a multiple of the granularity, while maintaining the original precise residual TXOP duration for actual transmission planning. This allows the signaling field to contain standardized values that third-party STAs can reliably interpret for NAV settings, while the actual transmission schedule remains precisely optimized.
2Productivity
If the STA uses the residual TXOP duration as is, then the channel access efficiency is improved, but the spatial reuse capability deteriorates due to NAV conflicts for third-party STAs
Solution Approach 1:
The patent segments the TXOP duration information into two parts: the rounded value for NAV signaling to third-party STAs, and the precise residual value for actual transmission scheduling. This segmentation allows different portions of the information to serve different functions - one for coordination and conflict avoidance, the other for efficient resource utilization.
3Manufacturing precision
If the STA transmits non-rounded TXOP duration, then the transmission scheduling accuracy is improved, but the signaling field compatibility deteriorates
Solution Approach 1:
The patent transforms the TXOP duration parameter into a rounded value that conforms to the granularity requirements of the signaling field specification. This ensures compatibility with existing WLAN standards and third-party STA implementations, while the original precise scheduling requirements are maintained separately in the transmission planning process.
Data Source
AI summary
A method for transmitting a frame by a STA in a wireless LAN system according to an embodiment of the present invention may comprise: receiving a first frame from an AP; determining, on the basis of the first frame, a TXOP duration value to be included in a SIG field of a second frame that the STA is to transmit; and transmitting the second frame, in determining the TXOP duration value, the STA calculates a residual TXOP duration that may retain after the second frame is transmitted, on the basis of a TXOP duration indicated through the first frame, and when the residual TXOP duration is not a multiple of a granularity of a time unit used by the SIG field, the STA approximates the residual TXOP duration to be a first TXOP duration value which is a multiple of the granularity.