Time synchronization method, device and distributed time synchronization system
A time synchronization device and time synchronization technology, applied in the field of communication, can solve problems such as large time deviation of output time information, base station out of synchronization, call connection cannot be established, etc., to increase reliability, improve reliability, improve operability and reliability effect
Active Publication Date: 2014-10-08
CHINA MOBILE COMM GRP CO LTD
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[0004] 1. When the time server of the upstream node on the local network cannot be traced to the time source, for example, when the satellite receiving board fails, the dozens or hundreds of base stations at the end of the local network coverage area cannot obtain accurate time, which will cause the base station to fail. step, the call connection cannot be established, and the system reliability is low
[0005] 2. When using satellite time sources such as GPS, the following situations may occur: Although the system and equipment do not generate alarm information, the output time information is wrong, resulting in a large time deviation. Since there is no alarm information at this time, the network side cannot monitor the problem, but The base station obtains the wrong time, which has caused out-of-synchronization, which has caused great difficulties in network operation and maintenance.
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[0036] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0037] Method embodiment
[0038] figure 1 This is a flowchart of the first embodiment of the time synchronization method according to the present invention, such as figure 1 As shown, this embodiment includes:
[0039] Step S102: The time server receives two or more time source information, such as: air time source, time source transmitted through the network; or air time source, network transmission time source, internal time source; or air time source / network transmission time source Any type, internal time source; or when there are multiple network transmission time sources input, the network source selection algorithm (such as the PTP protocol source selection algorithm) ca...
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The invention discloses a time synchronization method and device and a distributed time synchronization system. The method comprises the following steps: receiving more than two time source information as time synchronization references; monitoring abnormity of the time source information; and selecting another time source information as the time synchronization standard when monitoring that one time source information is abnormal. The method, the device and the system have the following beneficial effects: the reliability of the system can be improved; the technical problems of low time synchronization reliability, difficulty in network maintenance and the like in the prior art can be solved; and the system can ensure the time source information of a time server to take each other as a reference, thus improving the reliability of the system.
Description
Technical field [0001] The present invention relates to transmission and IP technology in the communication field, and in particular to a time synchronization method, device and distributed time synchronization system. Background technique [0002] With the development of mobile communication technology, systems such as Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) and CDMA2000 all have high-precision time synchronization requirements. The base station is equipped with a global positioning system (GPS) module to solve the problem of base station time synchronization. Taking into account national security and cost, there are also some adopting convergence and concentration of satellite time sources, and transmitting satellite time information to each base station through a ground transmission network, so that there is no need to install a GPS module in each base station to save costs. The network transmission time adopts the Precision Time Protocol (PTP) prot...
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IPC IPC(8): H04L7/00H04W56/00H04B7/26
Inventor 韩柳燕李晗
Owner CHINA MOBILE COMM GRP CO LTD