Electronic Tag Wakeup Signaling for Channel and Frequency Sync
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Solution Overview
Problem
Existing electronic tag systems lack efficient mechanisms for channel selection and frequency synchronization during downlink communications, particularly for passive and semi-passive IoT devices that rely on wireless energy harvesting without a clock crystal.
Innovation Solution
The system provides an energizing signal with a wakeup signal and synchronization signal for electronic tags, including a preamble portion for timing and a data portion for channel selection, enabling frequency synchronization and channel selection for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive and semi-passive IoT devices rely on wireless energy harvesting without a clock crystal, then device complexity and energy consumption are reduced, but channel selection and frequency synchronization become inefficient
Solution Approach 1:
The system performs channel selection and frequency synchronization information transmission in advance through the downlink wakeup signal preamble. The base station sends channel indication information and timing advance information before the actual data transmission, allowing the passive tag to prepare its transmission parameters without requiring complex onboard processing or clock crystal components.
Solution Approach 2:
The downlink wakeup signal acts as an intermediary that carries both energy harvesting capability and control information (channel selection, timing, frequency synchronization). This intermediary signal enables the passive tag to communicate efficiently without needing its own complex signal generation and processing capabilities.
2Use of energy by moving object
If electronic tags use wireless energy harvesting without battery, then energy consumption is reduced, but timing precision and frequency synchronization become difficult
Solution Approach 1:
The system implements timing advance mechanism where the base station measures the uplink transmission timing from the passive tag and sends timing advance information through the downlink wakeup signal. This feedback loop allows the base station to compensate for timing deviations caused by energy harvesting variability, maintaining precise timing synchronization without requiring the tag to have its own clock crystal.
3Ease of manufacture
If electronic tags lack clock crystal, then device complexity and manufacturing cost are reduced, but frequency synchronization and channel selection become unreliable
Solution Approach 1:
The base station determines and indicates the optimal uplink transmission channel and frequency offset information in advance through the downlink wakeup signal preamble. This preliminary action allows passive tags without clock crystals to reliably select transmission channels and synchronize frequency based on network-provided information rather than relying on their own unstable internal oscillators.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient channel selection and frequency synchronization for electronic tags, allowing them to transmit response signals effectively without a clock crystal, enhancing communication efficiency and reliability.
Implementation Method 1
passive and semi-passive IoT devices that rely on wireless energy harvesting without a clock crystal
Data Source
AI summary
Disclosed are systems and techniques for wireless communications. For example, a computing device can receive an energizing signal from a second device, the energizing signal comprising a wakeup signal including a preamble portion and a data portion, wherein the preamble portion indicates timing of the data portion and the data portion indicates one or more channels for transmission by the first device. The computing device can receive energy from the energizing signal. The computing device can transmit, to the second device based on an amount of the energy received, a response signal using one channel of the one or more channels for transmission.