DRFU-Description-

DRFU Description

Issue V1.1

Date 2011-02-15

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved.

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DRFU Description Contents

Contents

1 Introduction...................................................................................11.1 DRFU.......................................................................................................................................................................1

1.2 GATM......................................................................................................................................................................1

2 Technical Specifications..................................................................32.1 RF Specifications.....................................................................................................................................................3

2.2 Power Consumption................................................................................................................................................4

Power Consumption of the BTS3900.........................................................................................................................4

Power Consumption of the BTS3900A......................................................................................................................4

Power Consumption of the BTS3900L......................................................................................................................4

3 Acronyms and Abbreviations...........................................................6


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DRFU Description 3 Acronyms and Abbreviations

1 Introduction

1.1 DRFUThe Double Radio Frequency Unit (DRFU) is a Radio Frequency (RF) unit based on the dual density technology. DRFUs are installed in the indoor macro base station (including the BTS3900 and the BTS3900L) and the outdoor macro base station (namely, the BTS3900A). They are usually used in scenarios requiring medium or small capacity. A DRFU supports a maximum of two carriers. a.1 shows its exterior.

Figure a.1 Exterior of the DRFU

1.2 GATMThe GSM Antenna and TMA Control module (GATM) is optional. If DRFUs are configured in the RF cabinet and the Remote Electrical Tilt (RET) antenna or Tower-Mounted Amplifier (TMA) is required, the GATM must be configured.

The GATM is configured in the BTS3900 or the BTS3900A. a.1 shows the front panel of the GATM.


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Figure a.1 Front panel of the GATM


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2 Technical Specifications

2.1 RF Specifications

Figure a.1 RF specifications of the DRFU

Item RF Specification

Supported frequency band

Frequency Band RX Band (MHz) TX Band (MHz)

EGSM 900 880 to 915 925 to 960

PGSM 900 890 to 915 935 to 960

GSM 1800 1710 to 1785 1805 to 1880

Capacity A cabinet supports a maximum of 12 carriers. A cell supports a maximum of 24 carries.

A base station supports a maximum of 36 carriers, and the maximum configuration is S12/12/12.

Receiver sensitivity

Independent Receive Two-Way Receive Diversity

Four-Way Receive Diversity

–113 dBm –116 dBm –118.5 dBm

Output power 900M (GMSK/8PSK) Non-combined transmission: 45

W/30 W Combined transmission: 20 W/14

W PBT: 71 W/47 W

1800M (GMSK/8PSK) Non-combined transmission: 40

W/26 W Combined transmission: 18 W/12

W PBT: 63 W/42 W


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2.2 Power Consumption

Power Consumption of the BTS3900

Figure a.2 Power consumption of the BTS3900 that is configured with DRFUs

Item Specification

Power consumption (DC)

Configuration Typical Power Consumption (W)

S2/2/2, 900 MHz, TOC = 45 W 750

S4/4/4, 900 MHz, TOC = 20 W 1,140

S2/2/2, 1800 MHz, TOC = 40 W 750

S4/4/4, 1800 MHz, TOC = 18 W 1,150

NOTE

TOC refers to the output power at the top of the cabinet.

The typical power consumption of a specific base station refers to the maximum power consumption of the base station when it carries 30% of the total load.

Power Consumption of the BTS3900A

Figure a.3 Power consumption of the BTS3900A that is configured with DRFUs

Item Specification

Power consumption (AC)


S2/2/2, 900 MHz, TOC = 45 W 860

S4/4/4, 900 MHz, TOC = 20 W 1,290

S2/2/2, 1800 MHz, TOC = 40 W 860

S4/4/4, 1800 MHz, TOC = 18 W 1,300

Power Consumption of the BTS3900L

Figure a.4 Power consumption of the BTS3900L that is configured with DRFUs

Item Specification

Power consumption



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Item Specification

(DC) S6/6/6, 900 MHz, TOC = 20 W 1,370

S8/8/8, 900 MHz, TOC = 20 W 1,970

S2/2/2, 1800 MHz, TOC = 18 W 1,390

S4/4/4, 1800 MHz, TOC = 18 W 1,990


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3 Acronyms and Abbreviations

DRFU Dual-Density RF Unit

GATM GSM Antenna and TMA Control Module

MTBF Mean Time Between Failures

RET Remote Electrical Tilt

MTTR Mean Time to Recovery

RF Radio Frequency

PBT Power Boost Technology

RRU Remote RF Unit

TMA Tower-Mounted Amplifier

TOC Transmit Power at the Top of Cabinet


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