CN104378849A

CN104378849A - Distributed base station

Info

Publication number: CN104378849A
Application number: CN201310358980.8A
Authority: CN
Inventors: 冯绍鹏; 闫亮; 王丽
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Potevio Institute of Technology Co Ltd
Priority date: 2013-08-16
Filing date: 2013-08-16
Publication date: 2015-02-25

Abstract

The invention discloses a distributed base station which comprises a base-band processing unit and a remote radio unit. Uplink traffic channel port data between the base-band processing unit and the remote radio unit are frequency domain data after balance of a physical uplink shared channel (PUSCH). The uplink bandwidth of an Ir port can be effectively reduced.

Description

A kind of distributed base station

Technical field

The application relates to mobile communication technology field, particularly relates to a kind of distributed base station.

Background technology

In mobile communication system, the distributed base station of baseband processing unit (BBU)+Remote Radio Unit (RRU) has obtained large-scale application, and this networking mode also will be applied to LTE system, TD-SCDMA system etc.By Optical Fiber Transmission base band I/Q signal between BBU and RRU, the interface between BBU and RRU is called Ir interface, and the bandwidth of Ir interface depends on the transmission rate of baseband signal.

In prior art, the conventional dividing mode of BBU and RRU as shown in Figure 1, radio-frequency front-end process, the A/D of RRU primary responsibility antenna reception data change and intermediate frequency process, BBU is responsible for processing a large amount of baseband digital signal processing sections, comprises all Base-Band Processing functions of the bit-level such as symbol level and decoding such as FFT conversion, channel estimating, equilibrium.

The function of carrying out BBU and RRU in a conventional manner divides, RRU-BBU interface is by the time domain data under the multiple reception antenna base band sampling rate of transmission, up link RRU-BBU transmitted data amount is huge, and consumes resources is too much, and single RRU transmitted data amount is directly proportional to RRU antenna number, bandwidth.

For LTE system, under 20MHz bandwidth, when base station side antenna configuration is 8 antenna multiple-input and multiple-output (MIMO), Ir interface bandwidth is calculated as follows:

Uplink traffic transmission data volume=30.72MHz(sampling rate) × 16 (sampling precision) × 2(I/Q two-way) × 8(antenna number)=7864.32Mbps

Therefore, under 8 antenna LTEs configurations, generally need to adopt bandwidth to be the Optical Fiber Transmission Ir interface data of 10GHz bandwidth.

Because transfer of data at a high speed causes optical interface cost, increases considerably with the chip cost, transmission cost etc. of Interface Matching, seriously reduce the cost performance of equipment, therefore, the problem how reducing Ir interface bandwidth has become one of Important Problems of each operator and equipment manufacturers' concern.

Summary of the invention

This application provides distributed base station, effectively can reduce the upstream bandwidth of Ir interface.

The embodiment of the present application provides a kind of distributed base station, comprises baseband processing unit and Remote Radio Unit, and the reverse link traffic channel interface data between baseband processing unit and Remote Radio Unit is the frequency domain data after Physical Uplink Shared Channel PUSCH equilibrium.

Preferably, described Remote Radio Unit comprises: antenna data receiver module, front end processing block, A/D modular converter, intermediate frequency process module, single-carrier frequency division multiple access (SC-FDMA) demodulation process module, solution resource mapping processing module, channel estimation module and balance processing module;

Described baseband processing unit comprises inverse discrete Fourier transform IDFT and separates precoding module and decoding module.

As can be seen from the above technical solutions, by repartitioning reverse link traffic channel PUSCH function, RRU process is mentioned by most of symbol level process, interface data becomes the frequency domain data after balanced merging from original base band time domain data, thus effectively reduces the interface bandwidth of BBU-RRU.Select the frequency domain data after PUSCH equilibrium as the interface data of BBU and RRU, due to the data that PUSCH equilibrium is after multiple reception antenna merging treatment, have nothing to do with actual antennas number, therefore can greatly reduce interface data transmission amount, and the data volume of transmission is relevant to user scheduling bandwidth.

Accompanying drawing explanation

Fig. 1 is the conventional dividing mode schematic diagram of BBU and RRU in prior art;

Fig. 2 is BBU and the RRU dividing mode schematic diagram that the embodiment of the present application proposes.

Embodiment

RRU-BBU interface data is directly proportional to uplink receiving antenna number.The fundamental design idea of the application is: select the foundation that the module interface had nothing to do with antenna is repartitioned as BBU and RRU function as far as possible, to reach the object reducing RRU-BBU interface data bandwidth.For Traffic Channel, select the frequency domain data after Physical Uplink Shared Channel (PUSCH) equilibrium as the interface data of BBU and RRU, due to the data that PUSCH equilibrium is after multiple reception antenna merging treatment, have nothing to do with actual antennas number, therefore interface data transmission amount can greatly be reduced, and the data volume of transmission is relevant to user scheduling bandwidth, instead of processes all reception data.

Technical scheme is by repartitioning reverse link traffic channel PUSCH function, RRU process is mentioned by most of symbol level process, interface data becomes the frequency domain data after balanced merging from original base band time domain data, thus effectively reduces the interface bandwidth of BBU-RRU.

For making the know-why of technical scheme, feature and technique effect clearly, below in conjunction with specific embodiment, technical scheme is described in detail.

Fig. 2 is that RRU and the BBU functional module that the embodiment of the present application proposes divides schematic diagram, RRU be responsible for each antenna receive data radio-frequency front-end process, modulus (A/D) conversion, intermediate frequency process, single-carrier frequency division multiple access (SC-FDMA) demodulation process, separate resource mapping, channel estimating, equilibrium waits process, after BBU is responsible for balanced merging, the inverse discrete Fourier transform (IDFT) of data separates precoding, separates constellation mapping, the bit-level processing capacities such as decoding.

After being repartitioned by the reverse link traffic channel function of the application, BBU and RRU interface data becomes the frequency domain data after balanced merging, has nothing to do with uplink receiving antenna number, only relevant with the fluxion of transmission; Interface data has changed to frequency domain valid data by time domain in addition.After interface redefines, for LTE20MHz system, the maximum double fluid of uplink is example, then BBU and RRU interface bandwidth is as follows:

Reverse link traffic channel coffret data volume=1200(RB number) * 12(OFDM symbolic number) * 2(double fluid) * 32(IQ bit number)/1ms=921.6Mbps

Repartitioning of the reverse link traffic channel transfer function proposed by the application, the interface data of BBU with RRU relevantly with reception antenna becomes with to transmit fluxion relevant by original, become frequency domain valid data by time domain sampled data, interface bandwidth data volume is effectively reduced.

The foregoing is only the preferred embodiment of the application; not in order to limit the protection range of the application; within all spirit in technical scheme and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.

Claims

1. a distributed base station, comprises baseband processing unit and Remote Radio Unit, it is characterized in that, the reverse link traffic channel interface data between baseband processing unit and Remote Radio Unit is the frequency domain data after Physical Uplink Shared Channel equilibrium.

2. distributed base station according to claim 1, it is characterized in that, described Remote Radio Unit comprises: antenna data receiver module, front end processing block, A/D modular converter, intermediate frequency process module, single-carrier frequency division multiple access demodulation process module, solution resource mapping processing module, channel estimation module and balance processing module;

Described baseband processing unit comprises inverse discrete Fourier transform solution precoding module and decoding module.