Wireless Terminal Control Frame for GPS-Denied IoT Synchronization
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Solution Overview
Problem
In IoT applications, terminals used indoors or underground often struggle to receive GPS signals, which are necessary for determining transmission times, frequencies, and codes, leading to difficulties in establishing a low power consumption wireless communication system.
Innovation Solution
A transmission device and method that transmit a control frame containing transmission-related information determined by an internal time and terminal ID, followed by a data frame, allowing the reception device to recognize the wireless resource without relying on GPS signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS signals are used to determine transmission time and frequency, then time synchronization accuracy is improved, but the system becomes unusable indoors or underground where GPS signals cannot be received
Solution Approach 1:
The patent introduces an intermediary mechanism (internal clock and control frame exchange) to replace the direct GPS signal dependency. Terminals use their internal clocks to determine transmission parameters, and the receiving station sends control frames with timing information, acting as a mediator to achieve synchronization without direct GPS access.
Solution Approach 2:
The patent replaces the GPS satellite-based electromagnetic signal system with a local internal clock system and peer-to-peer control frame communication. This substitution allows the system to function independently of external satellite signals, enabling operation in GPS-denied environments.
2Measurement precision
If terminals continuously monitor for signals from receiving station, then transmission timing accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having terminals pre-determine their transmission parameters (time, frequency, code) based on internal clock readings before actual transmission. The receiving station also prepares control frames in advance with the necessary timing information, eliminating the need for continuous monitoring and reducing power consumption.
Solution Approach 2:
The system transitions from continuous signal monitoring to periodic control frame exchanges. Terminals wake up at predetermined intervals based on internal clock timing to send control frames or transmit data, rather than continuously monitoring for signals, significantly reducing power consumption while maintaining synchronization accuracy.
3Productivity
If GPS-based time information is used for resource determination, then wireless resource allocation efficiency is improved, but system cost increases due to GPS receiver requirements
Solution Approach 1:
The patent extracts the GPS receiver requirement from the terminal system by implementing local time determination using internal clocks. The timing functionality previously dependent on external GPS hardware is now achieved through software-based internal clock mechanisms and control frame exchanges, reducing hardware complexity and cost.
Solution Approach 2:
The patent replaces expensive GPS receivers with inexpensive internal clock circuits that can be implemented in low-cost terminals. The internal clocks, while not as precise as GPS, are sufficient for the application requirements and can be implemented using inexpensive hardware, making the system economically viable for large-scale deployment.
Data Source
AI summary
The present technology relates to a reception device and method and a transmission device and method that enable provision of a low power consumption wireless communication system that can be used regardless of location. A terminal on a transmission side transmits a control frame containing transmission-related information regarding a transmission time and a transmission frequency that are determined on the basis of an internal time and a terminal ID on a transmission side. Then, after transmitting the control frame, the terminal on the transmission side transmits a data frame containing predetermined data in accordance with the transmission time and the transmission frequency. The present technology can be applied to wireless communication systems.