WLAN Data Frame Bandwidth Adaptation in TXOP
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Solution Overview
Problem
Next-generation WLAN systems face challenges in transmitting data frames to STAs with different channel bandwidth capabilities without generating interference within the TXOP period, which affects reliability and throughput.
Innovation Solution
A method that allocates a transmission opportunity (TXOP) with a bandwidth for transmitting data frames, where subsequent frames have a bandwidth equal to or narrower than the preceding frame, using a multi-user multiple input multiple output (MU-MIMO) transmission scheme, and includes exchanging RTS and CTS frames to manage available bandwidth, ensuring efficient channel usage and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bandwidth is freely controlled within a TXOP period to transmit STAs having different capabilities, then the adaptability to different STA capabilities is improved, but interference with AP or STA transmitting and receiving frames in a frequency band is generated, worsening reliability
Solution Approach 1:
The TXOP period is segmented into multiple sub-periods, each with a fixed bandwidth configuration. This allows the system to adapt to different STA capabilities by selecting appropriate sub-periods while preventing interference through clear temporal separation between different bandwidth operations.
Solution Approach 2:
The bandwidth configuration is dynamically adjusted by allocating different sub-periods with different bandwidth settings according to STA capabilities. The system transitions between fixed bandwidth states rather than continuously varying bandwidth, which prevents interference while maintaining adaptability.
2Reliability
If a fixed bandwidth is allocated for the entire TXOP period, then interference with other AP or STA is prevented, improving reliability, but the ability to efficiently transmit to STAs with different capabilities is reduced, worsening throughput
Solution Approach 1:
The TXOP period is divided into multiple sub-periods with different fixed bandwidth allocations. This segmentation enables the system to maintain reliability within each sub-period while achieving higher overall throughput by matching bandwidth to STA capabilities across different time segments.
Solution Approach 2:
The bandwidth parameter is changed between sub-periods according to the capabilities of target STAs. By adjusting the bandwidth parameter at sub-period boundaries rather than during active transmission, the system improves throughput for diverse STAs while preventing interference through clear parameter transitions.
3Adaptability or versatility
If bandwidth is changed during active transmission within a TXOP period, then adaptability to different STA capabilities is improved, but transmission error is increased, worsening reliability
Solution Approach 1:
The transmission period is segmented into discrete sub-periods with fixed bandwidth configurations. Bandwidth changes occur only at sub-period boundaries, not during active transmission within a sub-period. This prevents transmission errors caused by mid-transmission bandwidth changes while maintaining adaptability through inter-sub-period bandwidth variation.
Solution Approach 2:
The bandwidth configuration for each sub-period is determined and fixed before transmission begins in that sub-period. This preliminary setting of bandwidth parameters ensures stable transmission conditions throughout each sub-period, preventing transmission errors while allowing adaptability across different sub-periods.
Data Source
AI summary
A method and device for transmitting a plurality of data units in a wireless local area network (WLAN) are discussed. The method includes obtaining by a station (STA) a transmission opportunity (TXOP), wherein the STA has a right to initiate frame exchange sequences during the TXOP; transmitting during the TXOP, a first data unit of the plurality of data units, wherein the first data unit comprises a signal field including information related to a bandwidth of the first data unit; selecting a bandwidth of a second data unit of the plurality of data units to be narrower than the bandwidth of the first data unit; and transmitting during the TXOP, the second data unit, wherein the second data unit comprises a signal field including information related to the bandwidth of the second data unit, wherein the first data unit is transmitted immediately before the second data unit.