RRU3908 Description
Issue
V1.1
Date
2011-01-15
HUAWEI TECHNOLOGIES CO., LTD.
Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.
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RRU3908 Description
Contents
Contents 1 Introduction.................................................................................................................................... 1 2 Technical Specifications .............................................................................................................. 3 2.1 Frequency Band ............................................................................................................................................... 3 2.2 Capacity ........................................................................................................................................................... 4 2.3 Receiver Sensitivity ......................................................................................................................................... 4 2.4 Input Power ...................................................................................................................................................... 5 2.5 Equipment Specifications ................................................................................................................................. 5 2.6 Output Power ................................................................................................................................................... 6 2.7 Power Consumption ......................................................................................................................................... 9 2.8 Environment Specifications ........................................................................................................................... 10
3 Acronyms and Abbreviations ................................................................................................... 11
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RRU3908 Description
1 Introduction
1
Introduction
The RRU3908 is an outdoor remote radio unit. It is the RF part of a distributed base station and can be located near the antenna. The RRU3908 performs modulation, demodulation, data processing, and combination and division of baseband signals and RF signals. With the Software Defined Radio (SDR) technology, the RRU3908 can support the dual-mode operation of either two modes of GSM/UMTS/LTE through software configuration modification. Figure 1-1 shows the appearance of the RRU3908 Figure 1-1 Appearance of the RRU3908
To meet the requirements for radio network deployment, the BBU3900 and RRU3908 are connected through a CPRI interface that uses an electrical or optical cable to transmit CPRI signals. The BBU3900 and the RRU3908 are connected in dual-star topology. That is, the CPRI port on the GTMU is connected to CPRI_W on the RRU3908, and the CPRI port on the WBBP or LBBP is connected to CPRI_E on the RRU3908, as shown in Figure 1-2.
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RRU3908 Description
1 Introduction
Figure 1-2 Dual-star topology
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RRU3908 Description
2 Technical Specifications
2
Technical Specifications
2.1 Frequency Band Table 2-1 RRU3908 V1 frequency band Frequency Band
RX Frequency Band (MHz)
TX Frequency Band (MHz)
900 MHz
890 to 915
935 to 960
880 to 905
925 to 950
850 MHz
824 to 849
869 to 894
1,800 MHz
1,710 to 1,755
1,805 to 1,850
1,740 to 1,785
1,835 to 1,880
1,850 to 1,890
1,930 to 1,970
1,870 to 1,910
1,950 to 1,990
1,900 MHz
Table 2-2 RRU3908 V2 frequency band Frequency Band
RX Frequency Band (MHz)
TX Frequency Band (MHz)
900 MHz
890 to 915
935 to 960
880 to 915
925 to 960
824 to 849
869 to 894
850 MHz
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RRU3908 Description
2 Technical Specifications
2.2 Capacity Table 2-3 Capacity Mode
Capacity
GSM
RRU3908(V1): Each RRU3908 supports six TRXs. RRU3908 (V2): Each RRU3908 supports eight TRXs.
UMTS
RRU3908: Each RRU3908 supports four TRXs.
GSM+UMTS
RRU3908 (V1): G5U1 or G4U2 RRU3908 (V2): G4U2
LTE
RRU3908 (V2): 1 x (1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz ) per PA
2.3 Receiver Sensitivity Table 2-4 Receiver sensitivity Mode
Receiver Sensitivity
UMTS
–125.5 dBm
–126.2 dBm
–125.3 dBm
–126.0 dBm
GSM
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–113.5 dBm
As recommended in 3GPP TS25.104, the receiver sensitivity (full band) is measured at the antenna connector on condition that the channel rate reaches 12.2 kbit/s and the Bit Error Rate (BER) does not exceed 0.001.
Frequency band (MHz): 890 to 915, 935 to 960, 1800
The receiver sensitivity is measured on the center frequency at the antenna connector on condition that 12.2 kbit/s Adaptive Multi Rate (AMR) service is in progress and the BER does not exceed 0.001.
Frequency band (MHz): 890 to 915, 935 to 960, 1800
As recommended in 3GPP TS25.104, the receiver sensitivity (full band) is measured at the antenna connector on condition that the channel rate reaches 12.2 kbit/s and the BER does not exceed 0.001.
Frequency band (MHz): 880 to 915, 925 to 960
The receiver sensitivity is measured on the center frequency at the antenna connector on condition that 12.2 kbit/s AMR service is in progress and the BER does not exceed 0.001.
Frequency band (MHz): 880 to 915, 925 to 960
Frequency band (MHz): 890 to 915, 935 to 960
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RRU3908 Description
2 Technical Specifications
Mode
LTE
Receiver Sensitivity –113.3 dBm
Frequency band (MHz): 880 to 915, 925 to 960
–113.8 dBm
Frequency band (MHz): 1800
–105.5 dBm
Frequency band (MHz): 890 to 915, 935 to 960
1 RX, BW > 5 MHz, QPSK1/3, 25 RB, AWGN
Frequency band (MHz): 880 to 915, 925 to 960
1 RX, BW > 5 MHz, QPSK1/3, 25 RB, AWGN
Frequency band (MHz): 1800
1 RX, BW > 5 MHz, QPSK1/3, 25 RB, AWGN
–105.3 dBm –105.8 dBm
2.4 Input Power Table 2-5 Input power Item
Specification
Input power
–48 V DC; voltage range: –36 V DC to –57 V DC
2.5 Equipment Specifications Table 2-6 Equipment specifications Item
Specification
Dimension (H x W x D)
485 mm × 380 mm × 170 mm (with the housing)
Weight
23 kg (with the housing)
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RRU3908 Description
2 Technical Specifications
2.6 Output Power
The LTE bandwidth can be 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz. 2T2R is supported.
The GSM power is measured when the modulation scheme is GMSK. If the modulation scheme is 8PSK, the output power is 1.8 dB less than that in GMSK mode.
Only RRU3908 V2 modules support the V2 specifications.
The RRU3908 at 1800 MHz supports the LTE mode in terms of hardware.
*: The UMTS mode is supported in terms of hardware.
The output power is 1 dB lesser than the standard power when the RRU3908 is located at a height of 3500 m to 4500m; and is 2 dB lesser than the standard power when the RRU3908 is located at a height of 4500 m to 6000m.
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.
Power sharing cannot be used together with RAN sharing between BSS and RAN, concentric cell, Co-BCCH, and IBCA.
In power sharing mode, the power control and DTX must be set to ON.
Power sharing assumes a random distribution of UEs in the cell.
Table 2-7 lists the typical configurations of the RRU3908 V1 at 900 MHz, 1800 MHz, 850 MHz, or 1900 MHz in compliance with the specifications for multi-carrier base station in EN 301 502 V9.2.1. Table 2-7 Typical configuration of the RRU3908 V1 (900MHz/1800MHz/850MHz/1900MHz,) Number of GSM Carriers
Number of UMTS Carriers
Output Power per GSM Carrier (W)
Output Sharing Power per GSM Carrier (W)
Output Power per UMTS Carrier (W)
1
0
40
40
0
2
0
40
40
0
3
0
20
20
0
4
0
15
20
0
5
0
12
12
0
6
0
10
12
0
1
1
40
40
30
1
1
30
30
40
1
2
30
30
20
2
1
20
20
30
2
1
15
15
40
2
2
15
15
20
3
1
10
12
30
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RRU3908 Description
2 Technical Specifications
Number of GSM Carriers
Number of UMTS Carriers
Output Power per GSM Carrier (W)
Output Sharing Power per GSM Carrier (W)
Output Power per UMTS Carrier (W)
3
2
10
12
10
4
1
7.5
10
20
4
2
7.5
10
10
5
1
6
9
20
0
1
0
0
40
0
2
0
0
30
0
3
0
0
20*
0
4
0
0
15*
Table 2-8 lists the typical configurations of the RRU3908 V2 at 900 MHz in compliance with the specifications for multi-carrier base station in EN 301 502 V9.2.1. Table 2-8 Typical configurations of the RRU3908 V2 (900 MHz) Number of GSM Carriers
Numb er of UMTS Carrie rs
Number of LTE Carriers
Output Power per GSM Carrier (W)
Output Sharing Power per GSM Carrier (W)
Output Power per UMTS Carrier (W)
Output Power per LTE Carrier (W)
1
0
0
40
40
0
0
2
0
0
40
40
0
0
3
0
0
20
20
0
0
4
0
0
20
20
0
0
5
0
0
13
15
0
0
6
0
0
13
15
0
0
7
0
0
10
13
0
0
8
0
0
10
13
0
0
1
1
0
40
40
40
0
2
1
0
20
20
40
0
2
1
0
30
30
20
0
3
1
0
13
15
40
0
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RRU3908 Description
2 Technical Specifications
Number of GSM Carriers
Numb er of UMTS Carrie rs
Number of LTE Carriers
Output Power per GSM Carrier (W)
Output Sharing Power per GSM Carrier (W)
Output Power per UMTS Carrier (W)
Output Power per LTE Carrier (W)
4
1
0
10
13
40
0
1
2
0
40
40
20
0
2
2
0
20
20
20
0
3
2
0
13
15
20
0
4
2
0
10
13
20
0
0
1
0
0
0
40
0
0
1
0
0
0
2 x 40 (MIMO)
0
0
2
0
0
0
40
0
0
2
0
0
0
2 x 20 (MIMO)
0
0
3
0
0
0
20
0
0
3
0
0
0
2 x 10 (MIMO)
0
0
4
0
0
0
20
0
0
4
0
0
0
2 x 10 (MIMO)
0
0
0
1
0
0
0
2 x 40 (MIMO)
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RRU3908 Description
2 Technical Specifications
2.7 Power Consumption
The typical power consumption for GSM is reached when the base station works with 30% load and power control and DTX are enabled. The maximum power consumption for GSM is reached when the base station works with 100% load.
The typical power consumption for UMTS is reached when the base station works with 50% load. The maximum power consumption for UMTS is reached when the base station works with 100% load.
The symbol * indicates that the RRU3908 V2 does not support UMTS 3×3 and 3×4 configurations when operating in the 850 MHz band.
Table 2-9 Power consumption Item
Specification
Power consumptio n
RRU3908 V1, 900 MHz
Configuration
Output Power per Carrier (W)
Typical Power Consumption (W)
Maximum Power Consumption (W)
GSM
3x2
20
760
910
3x4
20
730
1,070
3 ×6
12
730
1,070
GSM 3 ×2 + UMTS 3 × 1
20/20
870
1,090
GSM 3 ×4 + UMTS 3 × 1
10/20
820
1,050
GSM 3 ×4 + UMTS 3 × 2
10/10
820
1,050
3 ×1
20
490
590
3 ×2
20
640
790
3 ×3
20
880
1,100
3 ×4
15
880
1,110
RRU3908 V2, 900MHz/850MH z
Configuration
Output Power per Carrier (W)
Typical Power Consumption (W)
Maximum Power Consumption (W)
GSM
3 ×2
20
540
710
3 ×4
20
700
1,130
3 ×6
13
660
1,130
GSM 3 ×2 + UMTS 3 × 1
20/40
830
1,200
GSM 3 ×3+
15/40
820
1,270
GSM+UMTS
UMTS
GSM+UMTS
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RRU3908 Description
Item
2 Technical Specifications
Specification UMTS 3 × 1
UMTS
LTE
GSM 3 ×4 + UMTS 3 × 1
13/40
830
1,350
3 ×1
20
400
590
3 ×2
20
590
830
3 × 3*
20
750
1020
3 ×4*
20
870
1210
3 ×1
2 x 20
700
780
2.8 Environment Specifications Table 2-10 Environment specifications Item
Specification
Operating temperature
RRU3908 V2
–40°C to +55°C (without solar radiation) –40°C to +50°C (with solar radiation)
RRU3908 V1
–40°C to +50°C (without solar radiation) –40°C to +45°C (with solar radiation)
Relative humidity
5% RH to 100% RH
Protection level
IP65
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RRU3908 Description
3 Acronyms and Abbreviations
3
Acronyms and Abbreviations
Abbreviation
Full Name
3GPP
3rd Generation Partnership Project
CE
Channel Elements
CPRI
Common Public Radio Interface
DL
Downlink
FE
Fast Ethernet
MSR
Multi-Standard Radio
OM
Operation and Maintenance
RF
Radio Frequency
RFC
Radio Frequency Cabinet
RRU
Remote Radio Unit
RX
Receive
SDR
Software Defined Radio
TX
Transmit
UL
Uplink
UMTS
Universal Mobile Telecommunications System
UTRP
Universal Transmission Processing unit
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