ELR Preamble Marker Sequences for Early BSS Color Detection

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Solution Overview

Problem

Challenges in wireless communication include efficiently operating receiving devices while managing link budget imbalance between uplink and downlink to extend the uplink range, leading to difficulties in detecting and decoding incoming data in noise ranges with low peak to average power ratio, especially in identifying the basic service set (BSS) color for early packet termination and energy conservation.

Innovation Solution

Introduce enhanced long-range (ELR) mark symbols generated using orthogonal matrices, where the symbols are mirror images of each other, to improve detection by increasing the peak to average power ratio (PAPR) at the receiver, allowing early packet termination and energy conservation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the receiving device operates to detect and decode incoming data in noise range with low PAPR, then the uplink range can be extended, but the receiving device cannot efficiently operate and consume excessive energy

Engineering Contradiction:

Improveuplink rangeVSAvoidreceiving device energy consumption

Core Design Contradiction:

Length of moving objectVSUse of energy by moving object

Solution Approach 1:

The ELR mark symbols are placed in the preamble portion of the transmitted signal, allowing the receiver to detect BSS color information before processing the main data payload. This preliminary detection enables early packet termination decisions, avoiding full signal processing and reducing energy consumption while maintaining extended range capability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The BSS color identification function is extracted from the main data processing flow and implemented through dedicated ELR mark symbols in the preamble. This separation allows the receiver to perform lightweight BSS color detection independently, enabling early termination without processing the entire incoming signal, thus reducing energy consumption

Inventive Principle:

Principle #2Taking out (Extraction)

2Device complexity

If conventional preamble structures are used, then the system maintains simplicity, but the receiving device struggles to detect and decode incoming data when in noise range with low PAPR

Engineering Contradiction:

Improvepreamble structure complexityVSAvoidsignal detection reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The ELR mark symbols are designed with specific local properties (orthogonal matrix structure, mirror image symmetry) that enhance their detectability in the preamble portion. These localized quality improvements in specific signal regions enable reliable detection in noise conditions without requiring complex overall system changes

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent modifies specific parameters of the preamble symbols by using orthogonal matrices with mirror image properties. These parameter changes in the ELR mark symbols improve their correlation properties and detectability, enabling reliable BSS color identification in low signal-to-noise conditions while maintaining overall system simplicity

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If early packet termination is implemented without enhanced detection, then energy can be conserved, but the receiving device cannot reliably identify BSS color in noise range

Engineering Contradiction:

Improveenergy conservationVSAvoidBSS color identification accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The ELR mark symbols provide preliminary BSS color identification information in the preamble, enabling the receiver to make early termination decisions with high accuracy before processing the main data. This preliminary accurate detection ensures that energy conservation through early termination does not sacrifice BSS color identification reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces conventional detection methods with orthogonal matrix-based ELR mark symbols that have superior correlation properties. This substitution provides more reliable BSS color identification in the preamble, enabling accurate early packet termination decisions that conserve energy without sacrificing measurement precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250392963A1Marker sequences for extended long range wireless communications

Publication Date: 2025.12.25 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

Aspects of the present solution provide improved sequences for extended long-range (ELR) communications. A sender can generate a preamble for a physical layer protocol data unit (PPDU) frame of the ELR format to be transmitted to a receiver. The sender can select, from a plurality of rows of an orthogonal matrix, a row corresponding to a basic service set (BSS) color of a plurality of BSS colors, and encode into a first symbol of the preamble, a sequence of values from a first set of columns of the row. The sender can insert into a second symbol of the preamble, a second sequence of values from a second set of columns of the row, and transmit, to the receiver, the preamble with the first symbol and the second symbol to cause the receiver to identify the BSS color of the sender from the plurality of BSS colors.