Clock synchronization method and clock synchronization device
A clock synchronization and clock synchronization technology, applied in the field of communication, can solve problems such as GPS and PTP conflicts, and achieve the effect of time synchronization of the whole network
Inactive Publication Date: 2011-11-09
ZTE CORP
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[0008] The purpose of the present invention is to provide a method and clock synchronization device for synchronizing clocks, which solves the problem of conflict between GPS and PTP, and realizes the PTP time synchronization of the whole network
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[0025] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0026] see image 3 shown, as image 3 The invention provides a detailed implementation flow process when there is conflict between GPS and PTP on the device. Include the following steps:
[0027] Step 301: Perform PTP-related configuration on the nodes in the network according to the needs of the network;
[0028] Step 302: Calculate whether the port state is master, slave or passive port according to the PTP port state selection algorithm;
[0029] Step 303: Access and configure the GPS clock source;
[0030] Step 304: When there is GPS access on the detection device, whether there is also a Slave port of PTP, if yes, then go to step 305, if not, then go to step 306;
[0031] Step 305: discarding the received GPS message;
[0032] Step 306: Receive GPS message;
[0033] Step 307: Process the received GPS message to realiz...
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The invention discloses a clock synchronization method and a clock synchronization device. The method comprises the following steps: detecting states of all PTP (Precision Time Protocol) ports of the to-be-synchronized apparatus, thereby determining the roles of all the PTP ports, wherein if a slave port exists in the PTP ports, the to-be-synchronized apparatus only carries out PTP clock synchronization treatment with other apparatuses. The clock synchronization device comprises a GPS (Global Positioning System) module, a PTP module and a collision detection module, wherein the collision detection module is connected with the PTP module and GPS module, used for detecting roles of all the PTP ports of the apparatus when PTP message receiving / transmission and GPS message receiving / transmission coexist in the apparatus, and informing the PTP module to carry out PTP clock synchronization treatment with other apparatuses if a slave port exists. By setting the collision detection mechanism, the invention solves the problems in time synchronization treatment when PTP message receiving / transmission and GPS message receiving / transmission coexist in the apparatus, thereby implementing time synchronization of the whole network.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a clock synchronization method and a clock synchronization device. Background technique [0002] Ethernet is currently the most widely used network. With the development of the network, profound changes have taken place in its networking form, business type, and application occasions. In the process of Ethernet moving towards network integration, clock synchronization has also been raised. increasing demand. [0003] Among them, in the TD-SCDMA mobile network, not only frequency synchronization but also strict time synchronization are required between base stations. At present, GPS (Global Position System) is used to complete this requirement in the network, and the cost is relatively high; In the network, PTN equipment is used to carry the transmission of TD-SCDMA RAN services, and can support time-synchronized transmission. As an alternative to GPS, Ethernet...
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IPC IPC(8): H04L7/00H04L29/06H04L12/56
CPCG06F1/12H04J3/0644H04J3/0688H04J3/085
Inventor 宋雪雁
Owner ZTE CORP