Radio Transmitter Receiver Clock Synchronization Error Compensation
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Solution Overview
Problem
Radio transmission systems in intelligent consumption meters face challenges with interference, energy efficiency, and precise time synchronization, leading to reduced communication quality and increased costs due to manufacturing tolerances and interference from other devices in shared frequency bands.
Innovation Solution
A method that uses a radio transmitter and receiver with a shared clock generator for determining carrier frequencies and sampling rates, allowing for error compensation in transmission times and frequencies, enabling energy-efficient operation and improved communication robustness by calculating a time correction factor based on estimated errors and using this factor for wake-up times during sleep modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If different crystals are used in transmitter and receiver, then frequency and time deviations occur due to manufacturing tolerances, but communication reliability deteriorates
Solution Approach 1:
The patent merges the frequency reference functions by having the receiver use the transmitter's crystal frequency as its reference instead of relying on a separate local crystal. This eliminates the frequency and time deviations caused by manufacturing tolerances between different crystals while maintaining communication reliability.
Solution Approach 2:
The patent introduces a synchronization signal as an intermediary that carries the transmitter's crystal frequency information to the receiver. This mediator allows the receiver to align its timing and frequency reference with the transmitter, resolving the reliability issue without requiring identical crystals.
2Ease of manufacture
If radio transmission uses shared frequency bands, then interference from other devices increases, but cost and complexity of dedicated frequencies increase
Solution Approach 1:
The patent implements periodic transmission of synchronization signals at specific intervals. This periodic action creates structured communication windows that reduce random interference from other devices in the shared frequency band while maintaining cost-effectiveness of using standard ISM bands.
Solution Approach 2:
The patent uses feedback mechanisms where the receiver detects and reports interference conditions, allowing the transmitter to adjust transmission parameters dynamically. This feedback loop reduces the impact of interference from other devices while continuing to use shared frequency bands.
3Measurement precision
If precise time synchronization is required, then system robustness against interference decreases, but time accuracy improves
Solution Approach 1:
The patent performs preliminary synchronization by establishing time and frequency references before actual data transmission begins. This preliminary action ensures precise time synchronization while allowing the system to recover from interference during subsequent transmissions.
Solution Approach 2:
The patent incorporates redundancy and error correction mechanisms in advance of potential interference events. By cushioning against expected interference through pre-planned error correction codes and redundant synchronization signals, the system maintains both time accuracy and robustness.
4Use of energy by moving object
If consumption meters use sleep mode for energy saving, then communication responsiveness decreases, but energy efficiency improves
Solution Approach 1:
The patent implements periodic wake-up cycles where consumption meters exit sleep mode at predetermined intervals to exchange synchronization signals and data. This periodic action maintains energy efficiency while ensuring communication responsiveness at regular intervals.
Solution Approach 2:
The patent enables consumption meters to autonomously manage their sleep-wake cycles based on received synchronization signals and local timing references. This self-service approach optimizes energy consumption while maintaining communication availability without requiring continuous active monitoring.
Data Source
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AI summary
The invention relates to a method for operating a radio transmission system with a radio transmitter (S) and at least one radio receiver (E), wherein the radio transmitter (S) comprises at least one transmitter timer (ZS), in particular a clock, and transmits a packet and/or a subpacket and/or a plurality of packets successively for the transmission of data, wherein the carrier frequency and the transmission times of the data and/or the carrier frequency and the sampling rate of the data and/or the transmission times of the data and the sampling rate of the data depend on the transmitter timer (ZS), in particular a clock, and the radio receiver (E) comprises at least one receiver timer (ZE), in particular a clock, with timing means for determining transmission times and/or for determining carrier frequencies and/or for determining sampling rates, wherein the radio receiver (E) calculates an error based on the received data,The invention estimates, in particular, a carrier frequency error and/or a sampling rate error and/or an error in the transmission time and determines a timing error from this, whereby a timing correction factor is determined for compensation based on the timing error. Furthermore, the invention relates to an arrangement of a radio transmission system which is operable according to the method.