Wireless LAN Preamble Configuration for EHT Bandwidth Puncturing
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Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently utilizing wide bandwidths and managing preamble structures for high throughput and data rates, particularly in emerging standards like IEEE 802.11be (EHT), which require enhanced PHY layer protocols and bandwidth management.
Innovation Solution
The proposed solution involves using wide bandwidths (160/240/320 MHz) with preamble puncturing and multiple RU transmission, along with EHT SIG transmission methods and BCC interleaver configurations, allowing for efficient bandwidth utilization and duplication of signal fields within specific bandwidth units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wide bandwidth (160/240/320 MHz) is used for high throughput, then data rate is improved, but system complexity increases
Solution Approach 1:
The wide bandwidth signal is segmented into multiple subcarriers that are independently processed and transmitted. The FFT size is increased to accommodate more subcarriers, allowing the wide bandwidth to be divided into manageable units that can be processed separately, thus reducing overall system complexity while maintaining high data rate.
Solution Approach 2:
The patent transitions from processing signals in the time domain to the frequency domain using FFT transformation. This dimensional change allows wide bandwidth signals to be processed more efficiently by operating on individual frequency components rather than the entire wideband signal simultaneously, reducing computational complexity.
2Productivity
If preamble puncturing and multiple RU transmission are used, then bandwidth utilization is improved, but signal field management complexity increases
Solution Approach 1:
The signal field is segmented into multiple copies distributed across different bandwidth units (RUs). Each RU contains a complete or partial copy of the signal field, allowing receivers to decode information from individual RUs without needing to process the entire wide bandwidth, thus simplifying signal field management while improving bandwidth utilization.
Solution Approach 2:
The signal field information is copied and distributed across multiple RUs and bandwidth units. This redundancy allows receivers to obtain complete information from any single RU, eliminating the need to manage complex signal field structures across the entire wide bandwidth and simplifying reception while maximizing bandwidth usage.
3Reliability
If signal field is duplicated in units of second bandwidth within first bandwidth, then receiving reliability is improved, but transmission overhead increases
Solution Approach 1:
The duplicated signal field copies serve multiple functions simultaneously: they provide redundancy for reliable reception, enable frequency diversity gain, and allow receivers to select the best copy based on channel conditions. This multi-functionality justifies the transmission overhead by delivering multiple benefits from the same duplicated structures.
Solution Approach 2:
The patent varies parameters such as the bandwidth unit size, duplication factor, and RU allocation to optimize the balance between reliability and overhead. By adjusting these parameters based on channel conditions and traffic requirements, the system achieves reliable reception while minimizing unnecessary transmission overhead.
Data Source
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Figure 2
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AI summary
According to various embodiments, a method in a station, STA, in a wireless local area network, WLAN, is proposed, which comprises: generating (S4210) a Physical layer Protocol Data Unit, PPDU, including a universal signal, U-SIG, field, an extremely high throughput signal, EHT-SIG, field, and a data field, and transmitting (S4220) the PPDU. The EHT-SIG field may be contiguous to the U-SIG field, the U-SIG field may include three-bit information related to a physical version of the PPDU, the U-SIG field may have a length of two symbols, the PPDU may be for single user transmission, one content channel of the EHT-SIG field may be duplicated in units of 20 MHz within an entire bandwidth of the PPDU, information on preamble puncturing for the PPDU within 80 MHz may be indicated as [x1 x2 x3 x4], each of x1, x2, x3, and x4 has a value of zero or one, each of x1, x2, x3, and x4 may have a value of zero for a corresponding 20 MHz channel being punctured, and the U-SIG field may include the information on the preamble puncturing.