RF Synchronization Circuitry for Asynchronous Timing Compensation
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Solution Overview
Problem
In wireless communications, especially in WCDMA systems, timing errors occur due to variable or uncompensated latencies in mobile terminals, leading to synchronization issues between base stations and mobile devices, which cannot be corrected effectively.
Innovation Solution
The implementation of synchronization circuitry that uses counters to associate timing of received and transmitted RF messages, providing accurate timing for the start of transmission by determining receive and transmit count values and managing time delays between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous transmission is started in response to a command from base station, then transmission timing can be controlled, but timing errors occur due to variable or uncompensated latencies in the mobile terminal
Solution Approach 1:
The patent measures the latency of the baseband communications link in advance before continuous transmission begins. By performing this preliminary measurement and storing the latency value, the system can compensate for the known delay when timing the transmission start, thereby resolving the contradiction between controllable timing and timing errors due to uncompensated latencies
Solution Approach 2:
The patent implements a feedback mechanism where the measured latency from the baseband communications link is fed back to the timing control logic. This feedback allows the system to adjust the transmission timing based on the actual measured delay, improving both timing accuracy and synchronization reliability
2Measurement precision
If latency measurement and compensation mechanisms are implemented, then timing accuracy improves, but device complexity increases
Solution Approach 1:
The patent employs a self-service approach where the mobile terminal autonomously measures its own baseband communications link latency and performs self-compensation. By using internal counters and timing logic already present in the device, the system achieves improved timing accuracy without requiring external calibration equipment or complex additional hardware
Solution Approach 2:
The patent changes the timing parameter by applying a compensation value derived from the measured latency. Instead of adding complex hardware, the system adjusts the transmission timing parameter mathematically based on the measured delay, thereby improving timing accuracy while minimizing increases in device complexity
Data Source
AI summary
The present invention relates to synchronization circuitry that is used to synchronize an asynchronous received RF message with a transmitted RF message. In one embodiment of the present invention, the synchronization circuitry includes at least one counter, which is used to associate timing of the asynchronous received RF message with a receive count value, and associate timing of the transmitted RF message with a transmit count value. A time delay between occurrence of the receive count value and the transmit count value provides accurate timing for the start of the transmitted RF message.