Method and system for realizing clock synchronization

A clock synchronization and clock technology, applied in the field of communication, can solve problems such as non-existent processing methods, and achieve the effect of clock synchronization

Active Publication Date: 2012-08-01
ZTE CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In this case, it is necessary to solve the problem of phase identification between the system local clock and GPS clock, so as to realize clock synchronization, but there is no better processing method at present

Method used

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  • Method and system for realizing clock synchronization
  • Method and system for realizing clock synchronization

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Embodiment Construction

[0029] In practical applications, the GPS receiver is built into the RRU, and the phase detection unit is divided into two parts, which are respectively located in the BBU and the RRU. Use the 1PPS (pulse / second) clock output by the GPS receiver as a reference, and perform phase detection for 1PPS and the (BF, NodeB Frame) air interface frame frequency (BF, NodeB Frame) recovered by RRU from CPRI (Common Public Radio Interface) (for example: 10ms air interface frame frequency) According to the CPRI protocol (or IR (infrared) protocol or OBRI protocol, etc.), the phase detection result is sent back (such as through optical fiber) to the BBU, and the BBU performs genlock according to the received phase detection result to complete the system clock and GPS synchronization process.

[0030] available by figure 1 The system shown performs the above operations, figure 1 The system shown includes a BBU and RRU that can be connected, and the two communicate through the transceiver i...

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Abstract

The invention discloses a method and a system for realizing clock synchronization. A received 1pulse per second (PPS) clock can be used for reference, phase discrimination is conducted by aiming at the 1PPS clock and air interface frame rates recovered by and a radio remote unit (RRU), and a phase discrimination result is obtained; the phase discrimination result is sent to a base band Unit (BBU); and the BBU conducts genlock according to the phase discrimination result. By adopting the method for realizing clock synchronization, the phase discrimination problem of a remote global positioning system (GPS) is solved, and clock synchronization is realized.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for realizing clock synchronization. Background technique [0002] At present, on the basis of the traditional GPS (Global Positioning System, Global Positioning System) application, a remote GPS is developed, and the receiver and the antenna part are arranged remotely through optical fibers. However, remote GPS requires an independent remote module, as well as separate optical fiber resources and power supply. In order to simplify equipment and installation, and save optical fiber resources, the remote module and RRU (Radio Remote Unit, radio remote unit) can be further combined Integration means that the GPS receiver is placed inside the RRU, the GPS antenna is connected to the RRU, and the GPS module is connected to the BBU (Base Band Unit, Base Band Unit) by using the optical fiber of the RRU. In this case, it is necessary to solve the problem of phase identific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04W56/00
Inventor 董耀荣黄海旭
Owner ZTE CORP
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