CN104378848A

CN104378848A - Distributed base station

Info

Publication number: CN104378848A
Application number: CN201310358825.6A
Authority: CN
Inventors: 冯绍鹏; 李元柳; 闫亮
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
Anticipated expiration: 2033-08-16
Also published as: CN104378848B

Abstract

The invention discloses a distributed base station which comprises a base-band processing unit and a remote radio unit, and an uplink control signal transmitted by an Ir port between the base-band processing unit and the remote radio unit is composed of related measurement of a physical uplink control channel (PUCCH) and uplink control information. By means of the distributed base station, data of the uplink control signal transmitted by the Ir port can be greatly 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 functional module of BBU and RRU is as shown in Figure 1,

Based on the division of BBU and RRU in prior art, radio-frequency front-end process, the A/D of RRU primary responsibility uplink control signal antenna reception data change and intermediate frequency process, BBU is responsible for processing a large amount of baseband digital signal processing sections, comprise symbol level and the bit-level Base-Band Processing of PUCCH, comprise all Base-Band Processing functions such as FFT conversion, channel estimating, equilibrium and decoding.Conventionally, the interface data of uplink control signal is the time domain data under multiple reception antenna base band sampling rate, and interface transmission data amount is huge.

With single RRU, each RRU supports 8 antenna rf unit, and each radio frequency unit supports that the system of 20MHz bandwidth is example, and the RRU-BBU Bit data amount TransBitNum transmitted between every sub-frame of uplink RRU and BBU is:

The bit bit wide that sampling number × each sampled point of TransBitNum=RRU number × number of antennas × mono-subframe takies

＝1×8×30720×32

=7864320bit

Interface data amount=8(antenna number) * 30.72M(base band sampling rate) * 32(IQ bit number)=7864.32Mbps

Namely it is 7.86Gbps that the RRU-BBU needed for single RRU transmits data bandwidth requirement, and resource cost is huge.

And along with LTE is under the growing trend of the demands such as high bandwidth, multiple antennas MIMO, the data volume that the Ir interface based on prior art design will transmit also will be multiplied.In following networking and C-RAN technology, LTE and later technology introduce the technology such as the bandwidth sum MIMO of more than 20MHz, make digitized radio frequency digital stream on single site up to more than 50Gbps, take fiber resource huge, huge challenge is proposed to the interface bandwidth between BBU-RRU.

The interface data transmission of two-forty causes interface cost, transmission cost etc. to increase considerably, and the problem how reducing Ir interface bandwidth has become one of Important Problems of future device realization and networking.

Summary of the invention

This application provides a kind of distributed base station, the uplink control signal transmission bandwidth of Ir interface can be reduced.

A kind of distributed base station that the embodiment of the present application provides, comprise baseband processing unit and Remote Radio Unit, the uplink control signal of Ir interface between described baseband processing unit and Remote Radio Unit transmission is made up of the measurement of correlation amount of Physical Uplink Control Channel PUCCH and ascending control information.

Preferably, described Remote Radio Unit comprises: antenna data receiver module, front end processing block, analog-to-digital conversion module, intermediate frequency process module, single carrier frequency division multiplexing SC-FDMA demodulation process module, solution resource mapping processing module, channel estimation module, balance processing module, despreading processing module, solution constellation mapping block, descrambling module and decoding module.

Preferably, the measurement of correlation amount of described PUCCH and ascending control information comprise: the instruction of discontinuous transmission/certainty confirmation/negative acknowledgement DTX/ACK/NACK, channel quality instruction/pre-coding matrix CQI/PMI, order RI, Signal to Interference plus Noise Ratio SINR and Timing Advance.

As can be seen from the above technical solutions, by repartitioning the function of RRU and BBU, by the SC-FDMA demodulation process that BBU in prior art realizes, separate resource mapping, channel estimating, balanced merging, despreading process, separates constellation mapping, descrambling, the functions such as decoding move to RRU and realize, and BBU mainly carries out application decoding and measurement result process, thus greatly reduce the data volume of the uplink control signal of Ir interface transmission.

Accompanying drawing explanation

Fig. 1 is the functional block diagram of RRU and BBU of distributed base station of the prior art;

Fig. 2 is the functional block diagram of RRU and BBU of the distributed base station that the embodiment of the present application proposes.

Embodiment

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.

The application carries out function division to BBU and RRU again, and in order to effectively reduce uplink control signal coffret bandwidth, major part is functionally mentioned RRU process by the present invention, thus reaches the object reducing RRU-BBU interface data amount.For PUCCH, only the information such as measurement of correlation amount and ascending control information (UCI) are transmitted as interface data, comprise the information such as discontinuous transmission/certainty confirmation/negative acknowledgement (DTX/ACK/NACK), the instruction of channel quality instruction/pre-coding matrix (CQI/PMI), order (RI), Signal to Interference plus Noise Ratio (SINR) and Timing Advance.Repartition mode as shown in Figure 2.

After repartitioning the function of BBU and RRU, Remote Radio Unit comprises: antenna data receiver module, front end processing block, analog-to-digital conversion (A/D) module, intermediate frequency process module, single carrier frequency division multiplexing (SC-FDMA) demodulation process module, solution resource mapping processing module, channel estimation module, balance processing module, despreading processing module, solution constellation mapping block, descrambling module and decoding module.That is, by the SC-FDMA demodulation process that BBU in prior art realizes, separate resource mapping, channel estimating, balanced merging, despreading process, separates constellation mapping, descrambling, and the functions such as decoding move to RRU and realize, and BBU mainly carries out application decoding and measurement result process.

According to the application's scheme, when single RRU, the uplink control signal of Ir interface transmission is Physical Uplink Control Channel (PUCCH) result, comprise channel condition information (CSI) and descending HARQ feedback information two parts, wherein the composition of PUCCH CSI part of interface (the CQI/PMI/RI testing result of PUCCH carrying) is as shown in table 1:

Table 1

PUCCH HARQ feedback information interface (the SR/ACK infomation detection result of PUCCH carrying) forms as shown in table 2:

Table 2

Drawn by above form: for the situation of single RRU, PUCCH transmitted data amount is:

3280 (CSI interface bit number)+1680 (HARQ interface bit number)=4960bits;

After repartitioning BBU and RRU function, 0.063%, the IR interface bandwidth that the data volume of IR interface transmission uplink control signal is only former transmitted data amount is significantly 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, comprise baseband processing unit and Remote Radio Unit, it is characterized in that, the uplink control signal of Ir interface between described baseband processing unit and Remote Radio Unit transmission is made up of the measurement of correlation amount of Physical Uplink Control Channel PUCCH and ascending control information.

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, analog-to-digital conversion module, intermediate frequency process module, single carrier frequency division multiplexing SC-FDMA demodulation process module, solution resource mapping processing module, channel estimation module, balance processing module, despreading processing module, solution constellation mapping block, descrambling module and decoding module.

3. distributed base station according to claim 1 and 2, it is characterized in that, the measurement of correlation amount of described PUCCH and ascending control information comprise: the instruction of discontinuous transmission/certainty confirmation/negative acknowledgement DTX/ACK/NACK, channel quality instruction/pre-coding matrix CQI/PMI, order RI, Signal to Interference plus Noise Ratio SINR and Timing Advance.