Reader-to-Device Preamble Structure for Low-Power IoT Synchronization

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing communication systems face challenges in configuring and transmitting signals that are efficiently receivable by IoT devices with low complexity, particularly in 5G and beyond, while managing power consumption and synchronization.

Innovation Solution

A method involving the generation and transmission of a physical reader-to-device channel (PRDCH) preamble, comprising a first and second preamble, where the first preamble indicates the start of transmission with a fixed length and the second preamble facilitates synchronization using an on-off keying (OOK) modulation scheme, allowing for variable length based on coded bits per OFDM symbol.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single fixed-length preamble is used for signal transmission, then the device complexity is reduced, but the synchronization accuracy deteriorates

Engineering Contradiction:

Improvepreamble structure complexityVSAvoidsynchronization accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The preamble is divided into two distinct parts: a first preamble with fixed length for initial detection and a second preamble with variable length for precise synchronization. This segmentation allows each part to be optimized for its specific function, resolving the contradiction between simplicity and accuracy.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If the preamble length is fixed, then the device complexity is reduced, but the adaptability to different modulation schemes deteriorates

Engineering Contradiction:

Improvepreamble configuration complexityVSAvoidmodulation scheme adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The second preamble is configured with variable length that adapts to different modulation schemes (e.g., OOK with different M values). This dynamic configuration allows the system to maintain low complexity for standard schemes while adapting to specific requirements when needed.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the device continuously monitors for signals, then the signal detection reliability is improved, but the power consumption increases

Engineering Contradiction:

Improvesignal detection reliabilityVSAvoiddevice power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The two-preamble structure enables periodic monitoring at different levels: the first preamble triggers initial detection events, while the second preamble provides confirmation. This periodic structure allows the device to enter low-power states between monitoring events while maintaining reliable detection capability.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250348693A1Method and apparatus for receiving signal in communication system

Publication Date: 2025.11.13 ELECTRONICS & TELECOMM RES INST

AI summary

A method of a reader may comprise: generating a physical reader-to-device channel (PRDCH) preamble including a first preamble and a second preamble; generating a reader-to-device (R2D) signal including the PRDCH preamble and a PRDCH; and transmitting the R2D signal to a device, wherein the PRDCH preamble is located before the PRDCH in time domain.