Full Duplex Radio Communication for Alarm Systems
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Solution Overview
Problem
Existing radio communication systems for hazard alarm systems face disruptions due to unnoticed communication faults, synchronization issues, violation of duty cycle regulations, and collisions during simultaneous alarms, leading to unreliable and inefficient communication.
Innovation Solution
A full-duplex radio communication method that uses simultaneous routine signals and acknowledgments on separate channels, with frequency hopping to mitigate interference, and a neighborhood assistance mechanism to ensure reliable data transmission and synchronization, while adhering to duty cycle standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous handshaking communication is used between main station and secondary stations, then communication reliability is improved through acknowledgment signals, but communication disruptions occur when acknowledgments are lost and go unnoticed
Solution Approach 1:
A dedicated acknowledgment channel is introduced as an intermediary communication path between main station and secondary stations. This separate channel ensures that acknowledgment signals can be transmitted independently from data channels, preventing loss of confirmation information and enabling reliable detection of communication faults.
2Use of energy by moving object
If secondary stations wake up every 32 seconds for routine communication to save power, then energy consumption is reduced, but communication disruptions occur and synchronization is lost
Solution Approach 1:
A feedback mechanism is implemented where the main station monitors acknowledgment signals from secondary stations and provides corrective feedback when communication disruptions are detected. This allows the system to maintain synchronization and reliability even when stations operate in sleep mode with infrequent wake-ups.
3Speed
If multiple secondary stations transmit alarm signals simultaneously, then rapid alarm notification is achieved, but signal collisions occur causing communication disruptions
Solution Approach 1:
The communication system is segmented into multiple independent channels, including dedicated alarm transmission channels and acknowledgment channels. This segmentation allows multiple alarm signals to be transmitted simultaneously without collision, as each station has its own allocated transmission opportunities and the main station can process acknowledgments independently.
4Adaptability or versatility
If duty cycle regulations are complied with by limiting transmission time, then regulatory compliance is achieved, but communication disruptions occur in synchronous systems
Solution Approach 1:
The communication system employs periodic action with asymmetric duty cycles: secondary stations transmit briefly during their wake-up periods and remain in sleep mode for the majority of the cycle, while the main station maintains continuous or near-continuous operation. This periodic transmission pattern ensures compliance with duty cycle regulations for portable devices while the main station's continuous operation maintains system synchronization and reliability.
Data Source
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AI summary
The invention relates to a method for transmitting sensor data by radio in an alarm system in which secondary stations, which are each coupled to a state sensor, transmit sensor data as well as addresses which identify the secondary stations to a master station. Routine checking of the system state of each secondary station is successively carried out here. During the routine checking of each secondary station, the respective secondary station transmits a secondary station routine signal to the master station in an assigned routine signal time slot on a first channel and at the same time the master station transmits a master station routine signal to the respective secondary station on a second channel.