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Distributed base station clock synchronization method and system

A distributed base station and clock synchronization technology, applied in the transmission system, synchronization device, digital transmission system, etc., can solve the problems of expensive building use, construction cost and construction difficulty, and reduce construction difficulty and deployment cost , good adaptability, good filter effect

Inactive Publication Date: 2008-09-17
ZTE CORP
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Problems solved by technology

But this approach is for most cities, especially the first-tier big cities where every inch of land is expensive. On the one hand, those taller buildings will be important buildings in the city, and it is necessary to install additional standard time receiving antennas in these tall buildings. The building usage fees that need to be paid are very expensive; on the other hand, the BBU is generally not placed on the top floor of the building, so even after the standard time receiving antenna is erected, the feeder between the BBU and the standard time receiving antenna The construction cost and difficulty of construction will also be great

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  • Distributed base station clock synchronization method and system
  • Distributed base station clock synchronization method and system
  • Distributed base station clock synchronization method and system

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Embodiment Construction

[0029] figure 2 It is a functional block diagram of a distributed base station clock synchronization system provided by the present invention. The distributed base station includes two parts, a baseband unit and a radio frequency unit, which are connected through a communication link between them.

[0030] The baseband unit includes a phase detection result extraction module, a digital-to-analog conversion module, a low-pass filter, a voltage-controlled oscillator and a frequency divider, which are sequentially connected in series. After the frequency divider generates the system clock, it sends it to each RRU, and on the other hand, it provides the system clock to the clock extraction module in the radio frequency unit.

[0031] The radio frequency unit then includes a standard time receiving module, a clock extraction module, a phase detector module and a phase detection result transmission module, the standard time receiving module outputs to the phase detector module afte...

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Abstract

The present invention discloses a clock synchronization method of a distributed base station system and a system thereof. An RRU receives a standard time, and the system clock of BBU is regulated through transmitting the standard time and the phase demodulation value of the BBU system time to the BBU. Thereby the system clock synchronizes all the RRU system clocks to obtain the purpose of clock synchronization of the distributed base station. The invention overcomes the problem of difficult installation when anciently the standard time receiving module is installed on the BBU thereby reducing the construction difficulty and disposition cost of the distributed base station. And various different network topological structures can be adapted.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a clock synchronization method and system of a distributed wireless base station system. Background technique [0002] Distributed base stations generally connect the base band unit (BBU, Base Band Unit) with multiple radio frequency units (RRU, Remote Radio Unit) placed in various places through long-distance transmission means (such as optical fiber, cable, etc.), and improve the group While improving network flexibility, it reduces network maintenance costs. [0003] However, when using this architecture for networking, in addition to connecting multiple RRUs to the BBU according to a certain topology (such as a star network, a chain network, a ring network, etc.), and on this basis to complete the BBU and multiple In addition to signaling and data transmission between RRUs, it is also necessary to realize clock synchronization between the BBU and multiple RRUs...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04L7/00
Inventor 赵国峰
Owner ZTE CORP
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