Method and device for measuring and correcting time delay of digital optical fiber distribution system

Abstract

The invention relates to methods and devices for measuring and correcting a time delay of a digital fiber distribution system. The measuring method and device comprise a module for reporting an inherent time delay of a remote radio-frequency unit, a module for collecting time delays reported by lower stages in main optical ports of extension units, a module for calculating maximum time delays of the extension units (including time delays reported by current stages and lower stages), a module for collecting time delays reported by lower stages in main optical ports of an access unit, and a module for calculating a maximum time delay of the digital fiber distribution system. The correcting method and device comprise a module for calculating preset values of maximum time delays of lower-stage units transmitted by main optical ports of the access unit, a module for calculating preset values of maximum time delays of lower-stage units transmitted by main optical ports of the extension units, and a module for calculating a maximum time delay correction value of the remote radio-frequency unit. Through adoption of the methods and devices, uplink and downlink baseband I / O signal time delays of all covering end equipment can be aligned automatically in the digital fiber distribution system; the signal quality is improved; and the system stability is enhanced. Meanwhile, a maintenance workload is lowered.

Description

Technical field: [0001] The invention belongs to the field of mobile communication, in particular to a method and device for measuring and correcting time delay of a digital optical fiber distribution system. Background technique: [0002] At present, the field of mobile communication has experienced the first generation (analog), the second generation (GSM, CDMA1x), the third generation (WCDMA, CDMA-EVDO, TD-SCDMA), and is entering the fourth generation (FDDLTE, TD LTE). Later we use 1G, 2G, 3G, and 4G to describe the first, second, third, and fourth generation mobile communication technologies. Among them, 1G has been eliminated, but 2G, 3G, and 4G will coexist for a long time, and the communication services are becoming more and more abundant. [0003] With the increase of mobile communication users, people have higher and higher requirements for signal quality. However, in some occasions, such as dense buildings or large venues, it is difficult to provide effective ind...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring and correcting the time delay of the digital optical fiber distribution system, aiming to solve the problem that in the public area covered by multiple remote radio frequency units, the air interface will be out of sync in the downlink, and the signal source will appear in the uplink. The uncontrollable multipath fading of the base station leads to problems such as call failure and call quality degradation

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