RRU3926 Description

Issue V0.5

Date 2012-01-13

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved.
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RRU3926 Description Contents

Contents

1 Introduction.................................................................................................................................... 1
1.1 Appearance ....................................................................................................................................................... 1
1.2 Physical Ports ................................................................................................................................................... 2

2 Technical Specifications .............................................................................................................. 4

2.1 Frequency Band ............................................................................................................................................... 4
2.2 Capacity ........................................................................................................................................................... 4
2.3 Receiver Sensitivity ......................................................................................................................................... 5
2.4 Output Power ................................................................................................................................................... 5
2.5 Input Power ...................................................................................................................................................... 7
2.6 Equipment Specifications ................................................................................................................................. 7
2.7 Environment Specifications ............................................................................................................................. 7

3 Acronyms and Abbreviations ..................................................................................................... 9

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RRU3926 Description 1 Introduction

1 Introduction

The RRU3926 is an outdoor remote radio unit. It is the radio frequency (RF) part of a
distributed base station and can be located near antennas. The RRU3926 can modulate,
demodulate, combine, and divide baseband and RF signals. It also processes baseband and RF
signal data. With the Software Defined Radio (SDR) technology, the RRU3926 can work in
GU dual-mode through software configuration modification.

1.1 Appearance
Figure 1-1 shows the appearance of the RRU3926.

Figure 1-1 Appearance of the RRU3926

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RRU3926 Description 1 Introduction

1.2 Physical Ports

RRUs have a modular design. Its external ports are located in the cabling cavity or at the
bottom of the module.

Table 1-1 Physical ports on the RRU3926

Port Connector Quantity Function

RF port DIN 2 Connects to an antenna
Interconnection port DB2W2 1 Connects to the another RF
for receiving RF module
signals
Common public DLC 2 Connects to the baseband
radio interface unit (BBU3900)
(CPRI) port
Power supply socket Easy power 1 Receives -48 V DC power
receptacle (pressfit
type)
RET port DB9 1 Connects to a remote control
unit (RCU)
MON port DB15 1 Port for monitoring and
maintenance

A BBU3900 and RRU3926 are connected through a CPRI port using an electrical or optical
cable to transmit CPRI signals.
The BBU3900 and the RRU3926 are connected in dual-star topology. In this topology, the
CPRI port on the GTMU or UBRI is connected to CPRI0 on the RRU3926, and the CPRI port
on the WBBP or LBBP is connected to CPRI1 on the RRU3926, as shown in Figure 1-2.

Figure 1-2 Dual-star topology

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RRU3926 Description 2 Technical Specifications

2 Technical Specifications

2.1 Frequency Band

Table 2-1 RRU3926 frequency band

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

Band (MHz)

900 880–915 925–960

890–915 935–960
1800 1715–1785 1805–1880

2.2 Capacity
Table 2-2 Single-mode capacity

Mode Capacity
GSM Each RRU3926 supports 8 TRXs.
UMTS Each RRU3926 supports 6 TRXs.

Table 2-3 Dual-mode capacity

Mode Capacity
GSM + UMTS For detailed specifications, see Table 2-6.

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RRU3926 Description 2 Technical Specifications

2.3 Receiver Sensitivity

Table 2-4 RRU3926 receiver sensitivity

Mode Frequency 1-Way Receiver 2-Way Receiver 4-Way Receiver

Band (MHz) Sensitivity Sensitivity Sensitivity
(dBm) (dBm) (dBm)
GSM 900 -113.7 -116.5 -119.2 (theoretical
value)
1800 -114 -116.8 -119.5 (theoretical
value)
UMTS 900/1800 -125.8 -128.6 -131.3

 The receiver sensitivity of GSM, as recommended in 3GPP TS 51.021, is measured in the central
band (80% of the entire operating band, excluding the edge band) at the antenna connector on the
condition that the channel rate is 13 kbit/s and the Bit Error Rate (BER) is not higher than 2%.
 The receiver sensitivity of UMTS, as recommended in 3GPP TS 25.104, is measured in the entire
operating band at the antenna connector on the condition that the channel rate is 12.2 kbit/s and the
BER is not higher than 0.001.

2.4 Output Power

 RRU3926 modules operating in GSM mode and in the 900 or 1800 MHz frequency band comply
with the standard EN 301 502 V9.2.1.
 RRU3926 modules operating in UMTS, LTE, or Multi-Standard Radio (MSR) mode and in 900 or
1800 MHz frequency band comply with the standard ETSI EN 301 908 V5.2.1.
 The output power is 1 dB lesser than the standard power when the RRU3926 is located at a height of
3500 m to 4500m; and is 2 dB lesser than the standard power when the RRU3926 is located at a
height of 4500 m to 6000m.
 For S1, S2, S3, S4, S5, and S6, the GSM output power in 8PSK mode is the same as that in GMSK
mode with the improvement in the hardware capability. For S7 and S8, the GSM output power in
8PSK mode is the same as that in GMSK mode with the optional feature Enhanced EDGE Coverage
enabled.
 Factors such as the site-to-site distance, frequency-reuse factor, power control algorithm, and traffic
model affect the gain achieved by dynamic power allocation. Therefore, in most cases, the network
planning can be based on the power specification achieved by dynamic power allocation.
 In power sharing mode, the power control and DTX functions must be enabled. In GBSS8.1, power
sharing cannot be used together with functions concentric cell, Co-BCCH, tight BCCH frequency
reuse, or enhanced measurement report. In GBSS9.0, power sharing can be used together with
functions concentric cell, Co-BCCH, tight BCCH frequency reuse, and enhanced measurement
report. In GBSS8.1 and GBSS9.0, power sharing cannot be used together with IBCA, dynamic
MAIO, RAN sharing, or double-slot cell.
 Power sharing assumes a random distribution of UEs in the cell.

Table 2-5 and Table 2-6 list the typical configurations of the RRU3926.

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RRU3926 Description 2 Technical Specifications

Table 2-5 Typical RRU3926 configuration (900 MHz/1800 MHz, single-mode)

Number Number Output Power Output Sharing Output Power

of GSM of UMTS per GSM Power per GSM per UMTS
Carriers Carriers Carrier (W) Carrier (W) Carrier (W)

1 0 80 80 0
2 0 40 40 0
3 0 27 31 0
4 0 20 27 0
5 0 16 20 0
6 0 12 20 0
7 0 10 16 0
8 0 7 12 0
0 1 0 0 80
0 2 0 0 40
0 3 0 0 25
0 4 0 0 20
0 5 0 0 16
0 6 0 0 12

* indicates that configuration is supported in SRAN7.0.

Table 2-6 Typical RRU3926 configuration (900 MHz/1800 MHz, GU MSR)

Number of Number of Output Power per Output Power per

GSM Carriers UMTS Carriers GSM Carrier (W) UMTS Carrier (W)

1 1 40 40
1 2 40 20
2 1 30 20
2 1 20 40
2 2 20 20
3 1 20 20
3 2 16 10
3* 2* 13* 20*
4 1 12 20

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RRU3926 Description 2 Technical Specifications

Number of Number of Output Power per Output Power per

GSM Carriers UMTS Carriers GSM Carrier (W) UMTS Carrier (W)

4 2 12 10
5 1 10 20
5 2 10 10
6 1 10 10
6 2 8 10
7 1 8 10

2.5 Input Power

Table 2-7 Input power

Item Specifications

Input power -48 V DC; voltage range: -36 V DC to -57 V DC

2.6 Equipment Specifications

Table 2-8 Equipment specifications

Item Specifications
Dimensions (H x W x D) 400 mm x 240 mm x 160 mm (with the housing)
Weight 15 kg (with the housing)

2.7 Environment Specifications

Table 2-9 Environment specifications

Item Specifications
Operating temperature -40℃ to +50℃ (with solar radiation)

-40℃ to +55℃ (without solar radiation)

Relative humidity 5% RH to 100% RH

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RRU3926 Description 2 Technical Specifications

Item Specifications
Absolute humidity 1–30 g/m3
Atmospheric pressure 70 kPa to 106 kPa
Operating environment The RRU complies with the following standards:
 3GPP TS25.141 V3.0.0
 ETSI EN 300019-1-4 V2.1.2 (2003-04) Class 4.1: "Non-weather
protected locations."

Shockproof protection NEBS GR63 zone4

Ingress Protection (IP) IP65
rating

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RRU3926 Description 3 Acronyms and Abbreviations

3 Acronyms and Abbreviations

Abbreviation Full Name

3GPP 3rd Generation Partnership Project
BBU Baseband Unit
BER Bit Error Ratio
CPRI Common Public Radio Interface
DTX Discontinuous Transmission
MSR Multi-Standard Radio
RRU Remote Radio Unit

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