320 MHz PPDU LTF Sequence Construction for WLAN Numerology
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Solution Overview
Problem
Existing wireless LAN technologies face challenges in improving transmission rates, bandwidth, reliability, and reducing latency, particularly in supporting ultra-high reliability and low latency applications.
Innovation Solution
The method and device provide a physical layer protocol data unit (PPDU) with a new numerology, utilizing a long training field (LTF) sequence for 2×OFDM, which constructs LTF sequences in units of one tone for 80 MHz and 320 MHz PPDU transmissions, enhancing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing wireless LAN technologies are used, then system compatibility is maintained, but transmission rates and bandwidth are limited
Solution Approach 1:
The patent introduces a new numerology with different subcarrier spacing and cyclic prefix lengths compared to existing WLAN standards. By changing these fundamental parameters, the system achieves higher transmission rates and bandwidth efficiency while maintaining compatibility through careful design of the PPDU structure and training sequences
Solution Approach 2:
The patent segments the LTF sequence into multiple subsequences (first subsequence, second subsequence, third subsequence, fourth subsequence) that can be independently constructed and combined. This segmentation allows flexible adaptation to different bandwidth configurations (80 MHz, 320 MHz) and numerologies while maintaining a unified PPDU structure
2Productivity
If bandwidth is increased to improve transmission rates, then data capacity increases, but system complexity increases
Solution Approach 1:
The patent designs a universal LTF sequence construction method that can be applied across different bandwidth configurations (80 MHz, 320 MHz) and numerologies. The same fundamental construction principles and sequence patterns are used universally, reducing the need for separate complex designs for each configuration and thereby managing system complexity
3Loss of time
If new numerology is introduced to reduce latency, then transmission speed improves, but compatibility with existing systems deteriorates
Solution Approach 1:
The patent uses carefully designed LTF sequences and PPDU structures as intermediaries that bridge the new numerology and existing WLAN systems. These training sequences serve as a common language that allows receivers to accurately detect and synchronize to the new numerology signals while maintaining compatibility with existing hardware and protocols
Data Source
AI summary
A method and device for transmitting and receiving PPDU for new numerology in a wireless LAN system are disclosed. A method performed by a first STA, according to one embodiment of the present disclosure, comprises the steps of: generating a PPDU including LTF information; and transmitting the generated PPDU to one or more second STAs. A first LTF sequence for the LTF information in transmission of a 320 MHz PPDU is configured based on a first subsequence, a second subsequence, a third subsequence, and a fourth subsequence. Each of the first subsequence, the second subsequence, the third subsequence, and the fourth subsequence may be individually configured by using a second LTF sequence for the LTF information in transmission of a 80 MHz PPDU.