Long Training Field Sequences for PPDU Transmission Beyond 160 MHz
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Solution Overview
Problem
The IEEE 802.11ax standard is inadequate for meeting user requirements for high throughput, low jitter, and low latency, necessitating the design of a long training field sequence for larger channel bandwidths to support ultra-high transmission rates and ultra-high user density in IEEE 802.11be.
Innovation Solution
A method and apparatus for transmitting a physical layer protocol data unit (PPDU) with a long training field sequence designed for channel bandwidths greater than 160 MHz, utilizing sequences from the IEEE 802.11ax standard to ensure compatibility and low peak-to-average power ratio (PAPR), enhancing spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the channel bandwidth is increased to achieve ultra-high transmission rates, then the transmission speed is improved, but the existing long training field sequence design becomes inadequate
Solution Approach 1:
The long training field sequence is segmented into multiple parts, where each part corresponds to a specific bandwidth segment. The sequence is divided into first long training field sequence parts and second long training field sequence parts, with each part having a specific length corresponding to different bandwidth portions. This segmentation allows the training field to adapt to ultra-wide bandwidth channels while maintaining compatibility with existing 802.11ax standards.
Solution Approach 2:
The patent extends the training field sequence design from the traditional single-dimensional sequence to a multi-dimensional structure that incorporates both time-domain and frequency-domain characteristics. By introducing multiple sequence parts with different lengths and patterns, the solution adds dimensional complexity to handle the challenges of ultra-wide bandwidth while maintaining detectability and compatibility.
2Productivity
If a new long training field sequence is designed for larger bandwidth, then spectrum utilization is improved, but compatibility with existing standards may be affected
Solution Approach 1:
The long training field sequence is designed to serve multiple functions simultaneously: it maintains compatibility with existing 802.11ax standards while enabling support for ultra-wide bandwidth channels. The sequence structure is universal enough to be recognized by existing devices but extended enough to accommodate the larger bandwidth, achieving multi-functionality in a single design.
Solution Approach 2:
The patent employs a nested structure where smaller training sequence patterns are embedded within the larger training field sequence. The first and second long training field sequence parts contain nested patterns that are recognizable within the context of existing standards, while the overall structure extends to support larger bandwidth. This nesting allows incremental compatibility while achieving the desired bandwidth extension.
3Measurement precision
If the long training field sequence length is increased for larger bandwidth, then channel estimation accuracy is improved, but the time overhead increases
Solution Approach 1:
Different portions of the training field sequence are assigned different local qualities and patterns. The first long training field sequence part uses a specific pattern optimized for certain bandwidth segments, while the second part uses a different pattern for other segments. This local quality differentiation allows each portion to be optimized for its specific function, improving overall channel estimation accuracy without requiring uniform extension of the entire sequence.
Solution Approach 2:
The patent applies partial action by providing training sequence parts that are sufficient for the required bandwidth estimation without unnecessarily extending the entire sequence. The first and second long training field sequence parts are designed with specific lengths that provide adequate coverage for channel estimation in ultra-wide bandwidth channels, avoiding excessive time overhead while maintaining sufficient estimation accuracy.
Data Source
AI summary
This application provides a method and apparatus for transmitting a physical layer protocol data unit, so as to design a long training field sequence for a larger channel bandwidth. The method includes: generating a physical layer protocol data unit PPDU, where the PPDU includes a long training field, a length of a frequency domain sequence of the long training field is greater than a first length, and the first length is a length of a frequency domain sequence of a long training field of a PPDU transmitted over a channel whose bandwidth is 160 MHz; and sending the PPDU over a target channel, where a bandwidth of the target channel is greater than 160 MHz.