Data caching method, system and device for LTE base station optical fiber time delay compensation

Abstract

The invention discloses a data caching method for LTE (Long Term Evolution) base station optical fiber time delay compensation. The method comprises the steps that a BBU (Base Band Unit) performs downlink frequency domain base band processing on frequency domain data and the processed frequency domain data is transmitted to an RRU (Radio Remote Unit) through an IR (Interface between the RRU and the BBU) interface of the BBU; the RRU receives the frequency domain data of the BBU through the IR interface of the RRU and performs time delay compensation caching, extracts frequency domain data from caches, performs inverse operation of fast Fourier transform to obtain downlink time domain data and performs medium radio-frequency downlink processing on the downlink time domain data; the RRU performs medium radio-frequency uplink processing on uplink time domain data, performs fast Fourier transform on the processed time domain data to obtain frequency domain data, performs time delay compensation caching on the frequency domain data, extracts frequency domain data from caches and transmits the frequency domain data to the BBU through the IR interface of the RRU, and the BBU receives the frequency domain data of the RRU through the IR interface of the BBU and performs uplink frequency domain base band processing on the frequency domain data. The invention additionally discloses a data caching system and a data caching device for LTE base station optical fiber time delay compensation. The data caching method, the data caching system and the data caching device for LTE base station optical fiber time delay compensation have the advantages that the consumption of storage resources can be effectively reduced.

Description

technical field [0001] The present invention relates to the technical field of optical fiber time delay compensation of LTE base stations, in particular to a data caching method, system and device for optical fiber time delay compensation of LTE base stations. Background technique [0002] The remote radio frequency technology mode is a new type of distributed network coverage mode in the communication system. The baseband processing unit (BBU, BasebandUnit) is separated from the remote radio frequency module (RRU, RemoteRFUnit). The baseband processing unit is centrally set, and the remote radio frequency The module is placed in the place where coverage is required, which not only facilitates the site selection of the base station, but also reduces the feeder loss, thereby expanding the coverage area and quality of a single base station, and is easy to optimize and plan. [0003] In remote radio technology mode, the baseband processing unit and the remote radio module are c...

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Problems solved by technology

[0018] It can be seen from Table 1 that the amount of time-domain data required to be stored increases with the increase in the distance of the optical fiber, and at the same time increases exponentially with the number of antennas and the number of cells. Currently, this method uses cached time-domain data to compensate The fiber delay method has the advantages of strong versatility and simple control. However, with the increase in the distance of fiber optics and the increase in the number of cells and antennas processed by the baseband processing unit, the amount of data in the time domain is particularly large, which requires caching The amount of time-domain data is also very large, which consumes a large amount of storage resources and has high requirements for the processing capability of the base station chip

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