Phase Rotation Optimization for Punctured WLAN Bands
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Solution Overview
Problem
Current IEEE 802.11/Wi-Fi networks face challenges in maintaining predictable and low worst-case latency, which affects real-time applications, and require enhancements for improved reliability and throughput, especially with 80 MHz-based preamble puncturing and varying RF capabilities.
Innovation Solution
A method and device for optimizing phase rotation in a WLAN system, specifically for 80 MHz-based preamble puncturing in 240/320 MHz bands, using phase rotation values that minimize Peak to Average Power Ratio (PAPR) across different RF capabilities, ensuring efficient subcarrier use and high throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 80 MHz-based preamble puncturing is applied in 240/320 MHz bands, then spectral efficiency and flexibility are improved, but Peak to Average Power Ratio (PAPR) increases and RF capability compatibility becomes complex
Solution Approach 1:
The patent applies different phase rotation values to different subcarrier groups within the punctured bandwidth. Specifically, it divides subcarriers into multiple groups and applies distinct phase rotation patterns to each group, allowing localized optimization of PAPR while maintaining the overall puncturing structure for spectral efficiency.
Solution Approach 2:
The patent dynamically adjusts phase rotation parameters based on the puncturing pattern and RF capabilities. By changing the phase rotation values applied to different subcarriers and resource units, the system optimizes PAPR performance while accommodating various bandwidth configurations (80, 160, 240, 320 MHz).
2Reliability
If phase rotation is optimized for specific RF capabilities, then PAPR is reduced and link reliability is improved, but system complexity increases due to multiple RF capability configurations
Solution Approach 1:
The patent implements dynamic phase rotation optimization that adapts to different RF capabilities and puncturing patterns. The system selects and applies appropriate phase rotation values based on the actual transmission conditions, RF bandwidth, and puncturing configuration, rather than using fixed phase rotation schemes.
Solution Approach 2:
The patent creates a universal phase rotation optimization framework that works across multiple RF capabilities and bandwidth configurations (80, 160, 240, 320 MHz). The same basic mechanism handles various scenarios by adjusting parameters, eliminating the need for separate optimization schemes for each RF capability.
3Productivity
If broadband transmission with preamble puncturing is used, then throughput is enhanced, but latency predictability deteriorates
Solution Approach 1:
The patent applies phase rotation optimization in advance during the preamble construction phase, before actual data transmission begins. By pre-calculating and applying appropriate phase rotation values based on the puncturing pattern and RF capabilities, the system ensures optimal signal characteristics are established beforehand, enabling predictable latency performance.
Data Source
AI summary
A method and an apparatus for transmitting an EHT PPDU in a WLAN system are proposed. Specifically, a transmitter generates an EHT PPDU and transmits, on the basis of an RF, the EHT PPDU to a receiver through a 320 MHz band in which an 80 MHz band is punctured. A legacy preamble includes an L-STF and an L-LTF. The legacy preamble is generated by applying a first phase rotation value. The first phase rotation value is determined on the basis of a first scheme and a second scheme. The first scheme is a scheme of obtaining an optimal PAPR in the L-STF and the L-LTF. The second scheme is a scheme of obtaining an optimal PAPR on the basis of the maximum transmission bandwidth supported by the RF. The first phase rotation value is obtained on the basis of a second phase rotation value and a third phase rotation value. The second phase rotation value is a phase rotation value that repeats a phase rotation value defined for the 80 MHz band in an 802.11ax system. The third phase rotation value is a phase rotation value defined in units of the 80 MHz band in the 320 MHz band.