PPDU PHR Segmentation for Shorter, Reliable Wireless Transmission
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Solution Overview
Problem
Existing UWB communication technologies face challenges in designing the physical layer header (PHR) field to improve data transmission efficiency and reliability, particularly in demodulating the PHY payload field.
Innovation Solution
The PHR field is redesigned with reduced bit length for the first PHR information, using convolutional coding and a new codebook to indicate data rate and encoding scheme, reducing transmission duration and improving demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PHR field uses a conventional bit length to indicate data rate and encoding scheme, then the information is complete and unambiguous, but the transmission duration increases and demodulation performance deteriorates
Solution Approach 1:
The patent changes the parameter of bit length for the first PHR information from the conventional n bits to less than n bits. This parameter change enables shorter transmission duration while maintaining complete and unambiguous information through optimized encoding schemes and codebooks specifically designed for the reduced bit length
Solution Approach 2:
The PHR field is segmented into first PHR information (less than n bits) and second PHR information (n bits). The first PHR information indicates data rate of the second PHR information, allowing hierarchical encoding that reduces overall transmission duration while preserving complete information through the structured segmentation
2Reliability
If the PHR field is transmitted at a lower data rate to improve demodulation reliability, then demodulation performance improves, but transmission efficiency decreases
Solution Approach 1:
The patent changes the parameter of bit length to less than n bits for the first PHR information, which directly reduces transmission duration. Combined with optimized convolutional coding and specifically designed codebooks, this enables the system to achieve both improved demodulation reliability and enhanced data transmission efficiency by eliminating redundant transmission time
Solution Approach 2:
The patent implements dynamic indication where the first PHR information (less than n bits) indicates the data rate of the second PHR information. This dynamic structure allows the system to adaptively optimize transmission parameters, improving both demodulation reliability and transmission efficiency by avoiding fixed conservative data rate selections
Data Source
AI summary
This application relates to a physical layer protocol data unit (PPDU) transmission method and an apparatus. The method includes: sending a PPDU with a physical layer header (PHR) field including two parts, one part indicates a data rate of the other part. According to embodiments of this application, demodulation performance of the PHR field can be improved, and transmission duration can be reduced. This application is applied to a ultra-wideband (UWB)-based wireless personal area network (WPAN) system, a sensing system, and the like, including 802.15 series protocols, for example, the 802.15.4a protocol, the 802.15.4z protocol, or the 802.15.4ab protocol. This application is further applied to a wireless local area network system that can support 802.11 series protocols such as a next-generation Wi-Fi protocol of 802.11ax like 802.11be, Wi-Fi 7, or EHT, and a next generation of 802.11be like Wi-Fi 8.