Method for reducing uplink data transmission bandwidth in distributed base station and radio remote unit

Abstract

The invention discloses a method for reducing an uplink data transmission bandwidth in a distributed base station. On the side of a radio remote unit, processing on antenna carrier data after intermediate frequency processing is carried out is divided into an A branch and a B branch. The A branch comprises the following steps: removing CPs from the antenna carrier data, obtaining time domain data and carrying out a fast Fourier transforming on the time domain data, obtaining frequency domain data, removing a virtual subcarrier from the frequency domain data, obtaining a valid subcarrier containing PRACHs, decomposing the valid subcarrier according to RBs, removing the RBs occupied by the invalid PRACHs, and finally obtaining valid base band data. The B branch comprises the following steps: obtaining complete PRACH information from the antenna carrier data, removing CPs from the PRACH information, obtaining a PRACH detection signal, carrying out smoothing extraction on the PRACH detection signal, and obtaining a valid PRACH detection signal. The valid base band data and the valid PRACH detection signal are mapped to a transmission unit and sent to a base band processing unit. The invention further discloses the radio remote unit. According to the method for reducing the uplink data transmission bandwidth in the distributed base station and the radio remote unit, the data transmission bandwidth between the radio remote unit and the base band processing unit can be further reduced.

Description

technical field [0001] The invention relates to a distributed base station transmission technology, in particular to a method for reducing uplink data transmission bandwidth of a distributed base station and a remote radio module. Background technique [0002] The baseband processing unit and remote radio module are two important components in the communication system, which are communication modules attached to the base station, and the two modules are connected by optical fiber. Generally, antenna carrier data and control management data are transmitted between the baseband processing unit and the remote radio module. [0003] In the uplink direction, the radio remote module needs to receive the antenna carrier data from the antenna, amplify it through low noise and convert the radio frequency into an intermediate frequency, and then send it to the intermediate frequency processing module to extract the baseband antenna carrier data from the antenna carrier data processed ...

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Problems solved by technology

[0009] Using the above-mentioned prior art, what is transmitted at the interface of the transmission unit is frequency-domain data. Compared with the most commonly used method of transmitting time-domain data at the interface of the transmission unit at present, although the bandwidth of the interface of the transmission unit can be reduced, the transmission of the above-mentioned A branch processing When the effective subcarrier signals in the frequency domain are obtained, they still contain invalid Prach signals. Due to the existence of these invalid Prach signals, they will occupy a considerable part of the transmission bandwidth, which will increase the bandwidth requirements of the transmission unit interface, which is not conducive to reducing the baseband processing. The cost of the optical module of the unit and the remote radio module is not conducive to improving the reliability of the hardware circuit design

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