Method and apparatus for implementing TD-SCDMA base station synchronization

A TD-SCDMA and base station synchronization technology, which is applied in the field of TD-SCDMA base station synchronization and clock synchronization, can solve the problems of interference to adjacent cells and inability to align other base stations at the frame boundary, etc., to improve service quality, implement low investment costs, Implement a high-impact effect

Inactive Publication Date: 2009-06-24
JIANGSU HUACAN TELECOMM
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Problems solved by technology

[0003] However, the problem of using the above method is that the base station sometimes cannot receive the GPS timing signal because the satellite signal is too weak or the GPS receiver is faulty, so the base station clock that loses the synchronization source becomes a free-running clock. Usually

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  • Method and apparatus for implementing TD-SCDMA base station synchronization

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Embodiment Construction

[0036] When a TD-SCDMA base station loses GPS synchronization, its crystal oscillator will be in a free-running state. In this case, the deviation between the actual frequency of the crystal oscillator and the nominal frequency mainly comes from the manufacturing error of the crystal oscillator itself, the aging frequency drift error of the crystal oscillator, and the temperature frequency difference caused by temperature changes during the working process, usually several PPM (parts per million). The frequency deviation of the free-running crystal oscillator can be divided into two categories. One is that the operating frequency of the crystal oscillator fluctuates around a central frequency due to short-term instability. According to the long-term statistical average analysis, such short-term deviations are not It will cause the crystal oscillator clock phase deviation to accumulate, so after a long time, it will not cause the base station's timing frame signal and other bas...

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Abstract

The invention discloses a method for realizing TD-SCDMA base station synchronization, which is used for synchronizing a base station in the absence of GPS signal and includes that: step1, a GPS receiver receives a GPS satellite signal and transmits pulse per second signal to a synchronization module; the synchronization module adopts the pulse per second signal to measure the deviation value of work frequency and standard frequency of a crystal oscillator, and compute the frequency deviation compensation of the crystal oscillator; step 2, when the GPS receiver receives no GPS satellite signal, the GPS receiver informs the synchronization module; when the synchronization module is informed that the GPS receiver receives no GPS satellite signal, the synchronization module adopts frequency deviation compensation to compensate a frame timing signal generated by a clock signal of the crystal oscillator, and the frame timing signal is used for synchronizing the base station. The invention can eliminate phase deviation caused by the frequency deviation of the crystal oscillator and continuously accumulated with time, and enable the frame timing signal of the base station to be synchronous with frame timing signals of other base stations in longer time.

Description

technical field [0001] The invention relates to clock synchronization technology in the communication field, in particular to a method and device for realizing synchronization of TD-SCDMA base stations. Background technique [0002] TD-SCDMA is a third-generation mobile communication technology that combines time division and code division. It can be known from its own technical characteristics that the synchronization performance of the network has a great impact on system capacity and service quality. Therefore, it is necessary to select a clock with high stability and high precision as the network clock reference to ensure the time stability of the entire network. In the current TD-SCDMA system, the most used synchronization technology is the GPS (Global Positioning System, Global Positioning System) synchronization method. The base station of the cell receives the timing signal of the GPS, and adjusts the distance between the enabling signal of the uplink and downlink sw...

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Application Information

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IPC IPC(8): H04B7/26
Inventor 李萍
Owner JIANGSU HUACAN TELECOMM
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