WUR PPDU 1 BPSK Symbol Generation for Packet Classification

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Solution Overview

Problem

Current WLAN systems face challenges in efficiently transmitting Wake-Up Radio (WUR) Physical Protocol Data Units (PPDU) with 1 BPSK symbols for packet classification, requiring innovative methods to minimize additional processing and ensure accurate transmission.

Innovation Solution

A method involving an access point (AP) that generates a legacy-signal (L-SIG) field for WUR PPDU, followed by a 1 BPSK symbol based on the same bit sequence as the L-SIG field, and transmits these along with the WUR band preamble, optimizing the L-SIG field to include length information and using additional tones to reduce Peak-to-Average Power Ratio (PAPR).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a 1 BPSK symbol is added for packet classification in WUR PPDU, then packet classification accuracy is improved, but device complexity and processing overhead increase

Engineering Contradiction:

Improvepacket classification accuracyVSAvoidprocessing overhead

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the 1 BPSK symbol generation with the existing L-SIG field processing by using the same bit sequence for both, thereby achieving packet classification functionality without adding separate processing paths or increasing device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The L-SIG field bit sequence serves dual purposes: it generates the legacy signal field for traditional OFDM reception and simultaneously generates the 1 BPSK symbol for wake-up radio packet classification, making the processing universal and eliminating redundant operations

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If L-SIG field is repeated for 1 BPSK symbol generation, then throughput is improved, but Peak-to-Average Power Ratio increases

Engineering Contradiction:

ImprovethroughputVSAvoidPeak-to-Average Power Ratio

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

The patent changes the modulation parameter from repeating the entire L-SIG field to using only the bit sequence with 1 BPSK modulation, which maintains throughput while controlling the PAPR by avoiding the power peaks associated with full field repetition

Inventive Principle:

Principle #35Parameter changes

3Power

If additional tones are used in L-SIG field transmission, then PAPR is reduced, but device complexity increases

Engineering Contradiction:

ImprovePeak-to-Average Power RatioVSAvoidtransmission configuration

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent applies different tone configurations locally - using 53 tones for standard L-SIG and 57 tones specifically for WUR PPDU L-SIG field, optimizing PAPR for wake-up radio transmissions without affecting other transmission types and minimizing overall device complexity

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11284349B2Method and apparatus for transmitting frame in wireless LAN system

Publication Date: 2022.03.22 LG ELECTRONICS INC

AI summary

A method for transmitting a physical protocol data unit (PPDU) by an access point (AP) in a wireless LAN (WLAN) according to an embodiment of the present disclosure may comprise the steps of: generating a legacy-signal (L-SIG) field for a wake-up radio (WUR) PPDU; on the basis of the L-SIG field, generating one binary phase shift keying (BPSK) symbol located between the L-SIG field and a WUR band preamble; and transmitting the WUR PPDU including the L-SIG field, the one BPSK symbol, and the WUR band preamble, wherein the AP generates the one BPSK symbol on the basis of the same bit sequence as a bit sequence for the L-SIG field.