Bidirectional Radio Communication With Dual Channel Multiplexing
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Solution Overview
Problem
Current radio frequency communication methods in alarm and surveillance systems face limitations in utilizing frequency bands due to low authorized power and time occupancy, especially in sub-bands with low bandwidth and high power requirements, which restricts efficient data transmission, particularly for video and image data.
Innovation Solution
A two-way radiofrequency communication method that utilizes a combination of service and transfer channels with time division duplexing, allowing selective switching between channels based on activity phases to optimize transfer channel usage, ensuring compliance with regulatory constraints and maintaining compatibility with previous generation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the service channel is used for data transmission, then regulatory compliance is maintained, but transmission time and power are limited
Solution Approach 1:
The communication system is segmented into two distinct channels: service channel for control messages and transfer channel for data transmission. This segmentation allows each channel to be optimized for its specific purpose while complying with regulatory constraints on the service channel.
Solution Approach 2:
The service channel acts as an intermediary that coordinates the use of the transfer channel. Control messages sent via the service channel request and manage the allocation of transfer channel resources, enabling extended transmission capabilities while maintaining regulatory compliance through centralized control.
2Power
If the transfer channel is used for data transmission, then transmission power and duration are improved, but system compatibility with previous generation devices is compromised
Solution Approach 1:
The system implements multi-functionality by enabling devices to operate on both service and transfer channels. New devices can utilize the high-power transfer channel for data transmission, while maintaining the ability to communicate on the service channel, ensuring backward compatibility with previous generation devices that only support the service channel.
Solution Approach 2:
The system dynamically adapts its operation mode based on device capabilities and communication requirements. Devices can switch between service channel-only mode (for compatibility) and dual-channel mode (for enhanced performance), allowing the system to optimize transmission power and duration while maintaining compatibility with legacy devices.
3Productivity
If time division duplexing is implemented, then channel utilization is optimized, but device complexity increases
Solution Approach 1:
The system implements periodic time division duplexing with defined time windows for service channel communication and transfer channel communication. This periodic structure simplifies the management of dual-channel operations by providing predictable, repeating cycles that devices can synchronize to, reducing the complexity of real-time channel switching and coordination.
Data Source
Figure 1~3
Figure 2
Figure 4A~4B
AI summary
The present invention relates to a method of two-way radio frequency communication between a central master device (2) and several peripheral slave devices (3, 3', 3"), these devices (2, 3, 3', 3") being all physically separated and independent, but all part of the same system (1), this method using a slow service channel and a fast transfer channel, implementing, in a combined manner on the two aforementioned channels, time-division duplexing with a repetitive time-directing frame which consists of identical successive time windows predefined in terms of time alignment, duration and structure and comprising unaffected time slots and intermediate time intervals.A process characterized in that the guiding time frame is put in place on the service channel and that it consists of maintaining all the devices (2, 3, 3', 3") at maximum on the service channel and repeatedly determining a future availability time of the transfer channel.