Method and system for measuring delay dynamically by optical fiber
A dynamic and optical fiber technology, applied in the transmission system, electromagnetic wave transmission system, electrical components, etc., can solve the problems of clock jitter out of synchronization and high clock synchronization requirements, and achieve the effect of improving measurement accuracy, reducing passing links, and improving stability
Inactive Publication Date: 2012-09-05
ZTE CORP
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[0010] In view of this, one of the purposes of the present invention is to provide a method for dynamically measuring the delay of an optical fiber, which can solve the technical problems that the master-slave node clock synchronization requirements are particularly high, and the clock jitter is easy to lose synchronization
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[0036] The present invention will be described in further detail below according to the drawings and embodiments.
[0037] Figure 4 It is a principle diagram for realizing dynamic measurement of optical fiber delay in the present invention. The low-coupling correlation between the sending and receiving links, the sending and receiving links use their own independent clocks, and the sending and receiving links respectively use the inherent frame format as the measurement frame. The master node (master) and the slave node (slave) independently measure the delay time.
[0038] Figure 5It is a logical structural diagram of the system for optical fiber dynamic time delay measurement proposed by the present invention. The master node and the slave node use their own independent clocks to send measurement frames to each other. A master node measurement module and a slave node measurement module are respectively added to the physical layers of the master node and the slave node, ...
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The invention discloses a method and a system for measuring delay dynamically by an optical fiber based on an OBSAI protocol, which belongs to the filed of mobile communication. In the method, independent clocks are used by a master node and a slave node respectively; and by comparing a time difference T2 between the time when the slave node receives a measuring signal and the time when the slavenode sends the measuring signal with a time difference T4 between the time when the master node sends the measuring signal and the time when the master node receives the measuring signal, the delay time between the master node and the slave node is calculated by adopting different formulas; therefore, the method avoids the high requirement on strictly synchronous clocks of the master and slave nodes, overcomes the defects of a method for measuring the delay by the OBSAI protocol, greatly improves measuring accuracy; simultaneously, receiving and transmitting links are independent respectively, low-coupling relationship improves the stability of the system, and the measurement of the delay cannot influence the links, and can be carried out at any time.
Description
technical field [0001] The invention relates to an optical fiber time delay measurement technology between a base station and a radio frequency module in the field of mobile communication, in particular to a method and system for optical fiber dynamic time delay measurement. Background technique [0002] At present, the communication industry widely adopts the method that the base station and the radio frequency are independent, and the transmission between the base station and the radio frequency module is carried out through optical fibers. For signal transmission, the signal transmission between the base stations must be strictly synchronized. The base station has an antenna feeder and satellite synchronization, but the RF module has no antenna feeder and cannot be synchronized with the satellite. There is a certain delay in optical fiber transmission, so this delay must be measured and adjusted to keep the radio frequency part and the base station in sync. Otherwise, t...
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IPC IPC(8): H04B10/08H04B10/12H04L29/08H04B10/079
Inventor 钟辉捷王仰锋周敏
Owner ZTE CORP