Mobile Transceiver Time Base Synchronization
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Solution Overview
Problem
Mobile communication systems face challenges in achieving synchronization of measurement clocks among mobile transceivers, leading to undesirable effects such as crackles or beats in combined audio or video recordings, especially when sampling rates are unequal or change, affecting the quality of high-quality digital measurements.
Innovation Solution
A device and method for determining and transmitting a time base in a mobile communication system, where a base station transceiver provides a local time reference to a mobile transceiver, allowing for synchronization of sample clocks to an absolute time base, ensuring precise timing and reducing phase deviations to less than 1us, using Precision Time Protocol (PTP) for accurate synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional signaling techniques are used to distribute time information from base stations to mobile devices, then the system complexity is low, but the time synchronization precision is insufficient (coarse time information only)
Solution Approach 1:
The time synchronization process is divided into two segments: coarse time information distribution using conventional signaling techniques, and fine time information distribution using modulation of carrier signals. This segmentation allows each method to operate at its optimal complexity level while achieving high overall precision.
Solution Approach 2:
A carrier signal acts as an intermediary to transmit fine time information from the base station to mobile devices. The carrier signal is modulated with fine time information, enabling precise time synchronization to be distributed through the wireless channel without requiring complex direct communication protocols.
2Manufacturing precision
If measurement clocks of multiple mobile devices are not synchronized, then the device complexity is low, but the quality of combined measurement results deteriorates (crackles or beats in audio/video recordings)
Solution Approach 1:
The invention merges coarse time synchronization (from conventional signaling) with fine time synchronization (from modulated carrier signals) to create a unified time reference across multiple mobile devices. This combined approach ensures that all devices sample at the same absolute time, eliminating artifacts in combined measurements.
Solution Approach 2:
The base station transmits fine time information that enables mobile devices to adjust their local clocks based on the absolute time reference. This feedback mechanism ensures continuous synchronization across the network, maintaining high measurement quality without requiring complex peer-to-peer synchronization between devices.
Data Source
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AI summary
The invention relates to devices, to methods, and to computer programs for determining and transferring in a mobile communication system and to a system for synchronous scanning. A device (10) is designed to determine a time base in a mobile transceiver (100) in a mobile communication system (300). The mobile communication system (300) has at least one base-station transceiver (200), and the mobile transceiver (100) is designed to exchange information with the base-station transceiver (200) in repeating radio frames. The device (10) comprises at least one interface (12), which is designed to communicate with the at least one base-station transceiver (200) of the mobile communication system (300). The device (10) also comprises a control module (14), which is designed to control the at least one interface (12), to produce synchronization with the repeating radio frames, to increment a counter, and to receive a message from the at least one base-station transceiver (200). The message comprises information about a local time reference at the base-station transceiver (200). The control module (14) is also designed to adjust the counter on the basis of the information about the local time reference and thus to determine the time base.