3900 Series SRAN Base Station Solution Guide of 2011 V1.1(20110630)

Doc. Code

3900 Series SRAN Base Station Solution Guide of 2011

Issue

V1.1

Date

2012-05-15

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.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

http://www.huawei.com

Email:

[email protected]

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Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd

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Contents 1 Overview......................................................................................................................................... 4 1.1 Document Positioning ...................................................................................................................................... 4

2 Product Architecture and Components..................................................................................... 5 2.1 Architecture ...................................................................................................................................................... 5 2.2 BBU3900 ......................................................................................................................................................... 7 2.3 Multi-Mode RF Module Hardware Capability ............................................................................................... 10 2.4 Auxiliary Devices ........................................................................................................................................... 18

3 Features and Solutions ............................................................................................................... 28 3.1 Key Features................................................................................................................................................... 28 3.2 Solutions and Services ................................................................................................................................... 29

4 Topologies and Applications .................................................................................................... 37 4.1 Networking Capability ................................................................................................................................... 37

5 Upgrade, Expansion, Evolution, and Compatibility ............................................................ 41 5.1 Upgrade Capability ........................................................................................................................................ 41 5.2 Expansion Capability ..................................................................................................................................... 41 5.3 Evolution Capability ...................................................................................................................................... 41 5.4 Forward Compatibility Capability.................................................................................................................. 42

6 Reliability and Environment Adaptability ............................................................................ 43 6.1 Reliability ....................................................................................................................................................... 43 6.2 Environment Adaptability .............................................................................................................................. 45

7 FAQ ................................................................................................................................................ 46 8 References ..................................................................................................................................... 47 9 Acronyms and Abbreviations ................................................................................................... 48

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Change History Date

Revision

Description

Author

2011-03-30

V1.0

Completed the draft.

Hu Jiancheng

2011-06-30

V1.1

Routine update.

Hu Jiancheng

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1

Overview

1.1 Document Positioning This document is the technology sub-manual of the original SRAN base station sales guide. It should be used in conjunction with the sales strategy sub-manual of SRAN base station sales guide, which is now called the 2011 Multi-Mode Base Station Sales Strategy Guide. It assists global market product managers to sell Huawei SRAN base stations by supporting the task of providing customers with in-depth technical communication, clarification, and guidance.

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Product Architecture and Components

2.1 Architecture Huawei 3900 series multi-mode base station products are designed based on a modular architecture composed of the system cabinet, BBU3900, and RF modules: 

Indoor medium cabinet BTS3900, indoor large cabinet BTS3900L, outdoor macro BTS3900A, and distributed DBS3900



BBU3900 indoor base-band processing module



RFU, including the MRFU (SDR*), GRFU (GO), WRFU (UO), LRFU (LO) macro base station RFUs



RRU, including the RRU3908 (SDR*), RRU3008 (GO), RRU3804 (UO), and LRRU (LO) outdoor RRUs

The baseband processing unit (BBU3900) and RF module (RFU/RRU) are connected through the CPRI interface over electrical or optical cable. * In this document, SDR refers to the Huawei MRFU/RRU3908 series multi-mode RF modules instead of the common meaning of wireless software radio SRAN provides a comprehensive site solution through flexibly combination of the above three types of base station modules and associated equipment to satisfy the differing installation requirements of operators. For example, it supports indoor centralized installation, outdoor centralized installation, outdoor distributed installation, and co-module sharing of different wireless technologies in the same base station. Through coordinated deployment of different product configurations, SRAN can adapt to various scenarios and satisfy requirements for rapid, low-cost network deployment. The SRAN solution supports mixed configuration of RF modules of different modes. Consequently, the SRAN solution includes: Co-RF base stations (containing only SDR modules such as the MRFU) and co-cabinet base stations. Co-cabinet base stations are further divided into single-RF co-cabinet (with only non-SDR modules such as the GRFU + WRFU) and hybrid-RF co-cabinet (with mixed configuration of SDR and non-SDR modules such as MRFU + GRFU). Dual-mode versions are virtual versions formed by combining the GSM, UMTS, and LTE versions. The compatible versions are fixed, and GU and GL versions should not be arbitrarily combined. Otherwise, the dual-mode SRAN features cannot be guaranteed to function normally. For the detailed version relationships and commercial application policy, see the 2011 Multi-Mode Base Station Sales Strategy Guide.

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3900 Series SRAN Base Station Solution Guide of 2011 

INTERNAL

Macro NodeB −

BTS3900 and BTS3900L indoor models

−

BTS3900A outdoor model

Macro base stations centralize installation of the BBU3900 and RFU modules. Macro base stations can be selected in scenarios that require centralized installation or do not permit tower installation. The BTS3900L is recommended for centralized indoor installation, while the BTS3900A is recommended for centralized outdoor installation. 

Distributed base stations −

DBS3900 distributed base station This product consists of the BBU3900 and RRU. In scenarios requiring remote installation, the RRU can be installed near the antenna to reduce feeder loss and improve base station performance. 3900 series products are shown in Figure 2-1.

Figure 2-1 3900 series products and applications

Limitations and Marketing precautions For indoor macro base stations, new dual-cabinet deployments support stacking, while capacity expansion and cabinet expansion do not support stacked installation due to engineering implementation difficulty. The BTS3900Lis recommended as a replacement for the BTS3900 dual-cabinet stacked solution. Outdoor macro base stations do not support RFC stacking and do not support stacking of battery and RF cabinets. The APM30H or transmission cabinet (TMC11H) can, however, be stacked on top of the battery or RFC. The APM30H possesses limited power supply capability. When used with the AC BTS3900A, the APM30H supports only a single RFC. Scenarios with more than six RFUs require additional RFC and APM30H modules.

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2.2 BBU3900 2.2.1 BBU3900 Exterior The BBU3900 is a small box-type device with a 19-inch width and a 2U height. In indoor environments with 2U height or in protected outdoor cabinets, it supports arbitrary mixed configuration of GSM, UMTS, and LTE boards within the same BBU. The exterior of the BBU3900 is shown in Figure 2-2. Figure 2-2 GSM + UMTS multi-mode BBT3900 exterior

2.2.2 BBU3900 Boards and Module The BBU3900 slot configuration is shown in Figure 2-3. Installation of the BBU3900 in non-Huawei cabinets (with the exception of non-direct-ventilation machine room 19 inch transmission racks) and direct-ventilation machine rooms should be avoided whenever possible. Otherwise, uncertain heat dissipation risk due to mismatched vents and corrosion risk to BBU boards and structural components under high humidity may be introduced. If no other solution is available, first-line staff should contact R&D for analysis and resolution. See the SRAN6.0 3900 Multi-Mode Base Station Product Description regarding the board capabilities, interfaces, and GUL mode slot configuration of the BBU3900. Figure 2-3 BBU3900 slots

The following section describes new hardware and changes in SRAN5.0. 

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UPEUc −

The UPEUc digital power supply board provides new enhanced functions including power consumption statistics, flow equalization, and exception processing as well as greater output power.

−

A single digital power supply board provides 360 W at 60°C and supports 1+1 backup configuration. Two digital power supply boards provide 650 W at 60°C.


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



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−

RS485 interface: 2 RJ45 connectors, 250 A lightning protection; digital input interface: 2 RJ45 connectors, 8-way digital (voltage mode) input, 250 A lightning protection

−

The UPEUc can be used as a backup for the UPEUa, but the UPEUa cannot be used as a backup for the UPEUc.

FANc −

2U fan unit: The high-speed fan provides BBU heat dissipation capability of 650 W.

−

Noise rating: 52 dbA; Maximum noise: 54 dbA

−

The FANc is used in new shipment scenarios and serves as a backup in existing scenarios.

UBRI −

This board is newly added in SRAN5.0. It contains six CPRI ports and is used to expand the number of CPRI ports in multi-mode scenarios. This board is not configured in GO scenarios.

−

UBRI configuration principles: Configuration of the UBRI board is based on the corresponding number of GSM modules, that is, MRFU+D/GRFU modules including UMTS only or LTE only MRFUs. If the number of GSM modules is greater than six, configure the UBRI. Otherwise, the UBRI does not need to be configured. Macro + distributed configuration: When GSM mode is configured for macro and distributed base stations, the optical cable connecting the UBRI and RRU must be configured.

−

If fewer than six GSM modules are configured among two cabinets, the product sales manager should discuss the UBRI solution with the operator and determine the UBRI configuration based on the wishes of the operator. In case of project requirements, special project customization is required.

−

At most one UBRI board can be configured. In SRAN5.0, it may only be configured in the No. 2 slot of the BBU. In SRAN6.0, it is configured in the No. 2 slot by default but can be configured in the No. 1 slot under special circumstances. The following functions are not currently permitted between the carriers of the UBRI board CPRI port connection and the carriers of the GTMU board CPRI port connection:

−

i. Baseband hopping: In baseband hopping, carriers in the same band cannot be distributed across UBRI and GTMU boards. If this configuration is detected, only the function of the primary BCCH carrier is preserved. Non-primary-BCCH carriers trigger a configuration alarm.

−

ii. Antenna hopping: If cell carriers are distributed on both UBRI and GTMU CPRI ports, the antenna hopping capability should be disabled.

−

iii. Cross-module frequency hopping

−

iv. Cross-module power sharing: If configuration requires cross-module frequency hopping and cross-module power sharing and these two modules are distributed across the ports of the UBRI and GTMU boards, only the function of the primary BCCH carrier is preserved. Non-primary-BCCH carriers trigger a configuration alarm.

−

v. RRU co-cell: In RRU co-cell configuration, different location groups within the same cell are distributed across the CPRI ports of the UBRI and GTMU boards. If this configuration is detected, the entire cell triggers a configuration alarm.


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Limitations and Marketing precautions 1. For a GU/GU dual-mode base station configured with a GTMUa board, the UMTS or LTE mode traces the system clock of the GSM mode. Manual GSM soft reset or GSM soft reset due to an exception or dynamic data configurations may cause UMTS or LTE services unavailable. Services will be interrupted twice with an interval of 3 minutes, and each interruption lasts for about 100 ms. Since SRAN5.0, GSM soft reset does not affect services of other modes. GTMUa replacement, hard reset, and transmission link disconnection, however, still affect the services of other modes. 2. SRAN5.0 is recommended if the WBBPd board is configured. 3. SRAN5.0 adds the GSM mode UTRP and supports UMTS sharing of the GSM UTRP (E1/T1) transmission interface. 4. Based on PCN: SRAN-20100005, shipments of the BBU power supply module UPEUa and fan module FANa (the total power consumption of the boards installed in the BBU, without being converted by the UPEUa, is 330 W) are switched to the UPEUc and FANc as of 12/31/2010. Although this PCN has already been released, implementation of this change is scheduled for late-April 2011. Switching older ordinary fans with new high-speed fan boards may give operators a negative impression, for example, if the older fan boards are returned or discarded. Based on evaluation of the heat dissipation capability of the old fan boards, the fan boards will not be switched in indoor cabinet capacity expansion scenarios but will be switched in some outdoor scenarios. UPEUc / FANc configuration principles 1) New deployment scenarios If BBU power consumption is less than or equal to 330 W, ship and configure a single UPEUc. If BBU power consumption is higher than 330 W and less than or equal to 650 W, ship and configure two UPEUc boards. If the BBU must support power supply backup at less than 360 W, ship and configure two UPEUc boards. All new BBUs are configured and shipped with the high-speed FANc board. 2) Capacity expansion scenarios If the BBU power consumption after capacity expansion is less than or equal to 330 W, do not configure the UPEUc. If the BBU power consumption after capacity expansion is between 330 W and 650 W, ship and configure two UPEUc boards if one UPEUa board was previously configured. If one UPEUc board was previously configured, configure an additional UPEUc board. If two UPEUa boards were previously configured, replace them with two UPEUc boards. In A1 area outdoor cabinets, if the ordinary FANa is installed but capacity expansion requires configuration of two UPEUc boards, the capacity expansion applies the new high-speed FANc. The FANc board is not shipped or configured in other scenarios. 5. Existing cabinet BBU heat dissipation restrictions Based on good long-term working temperature, that is, room temperature of 25 to 30°C, the mid-sized indoor BTS3900 indoor cabinet (101/103) and large indoor BTS3900L cabinet (202) can meet 650 W BBU heat distribution requirements by lowering temperature specifications by 5 to 10°C. The OMB (MPE501) has limited space and supports only the heat dissipation requirements of the 250 W or lower BBU. Measures to improve the cabinet heat dissipation capability will not be implemented. Issue V1.1(2012-05-15)


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The outdoor DC system cabinets (MPE301/302/303) do not contain PSU/TM devices. The heat dissipation capability is equal to the heat dissipation capability of the BBU inside the cabinet (500 to 700 W). The maximum heat dissipation specification supported by the outdoor AC cabinets (MPE301/302/303) varies according to the long-term temperature of the working environment. Based on corrected test data, the heat dissipation capability limitations of the outdoor AC cabinets is as follows. After deducting the PSU, TM, and cabinet fan power (typical value is 350 W), the remainder is the heat dissipation space of the BBU. Figure 2-4 Existing outdoor system cabinet heat dissipation capability

6. If GSM and UMTS modes do not share transmission but both transmit over E1/T1, each GSM and UMTS must be configured with a UELP E1/T1 lightning protection board. When used outdoors, the lightning protection board is not required if the transmission interface and equipment share the same cabinet. If the transmission equipment and GTMU/WMPT are located in different cabinets with a distance longer than 5 m, the lightning protection board must be configured. It is required in indoor applications if the distance exceeds 30 m. The configuration of the lightning protection boards has changed according to PCN: SRAN-20100001. The lightning protection board moves from the BBU to the SLPU. Indoor cabinets do not require the configuration of the lightning protection board.

2.3 Multi-Mode RF Module Hardware Capability The single-mode RF module is described in the sales guide of the single-mode solution. This document describes on the SDR RFU and RRU.

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2.3.1 RF Module Exterior The RRU is an outdoor remote RF module, while the RFU is used in indoor cabinets or outdoor cabinets with protective features. The exteriors of the RRU and RFU are shown in Figure 2-5 Figure 2-5 RRU exterior (V2 hardware)

RFU exterior (V2 hardware)

2.3.2 xRRU System Principles In terms of modes, the RFU and RRU are further divided into single transmit (1T2R) and dual-transmit (2T2R) modules. System principles are shown in Figure 2-6. Figure 2-6 Dual-transmit module system principles

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Figure 2-7 Single-transmit module system principles

2.3.3 SDR RFU/RRU Hardware Capability 1.

Module Type

The SDR RFU/RRU hardware packages include: the V1 hardware platform introduced by SRAN3.0 including the RRU3908 V1 and MRFU V1; the V2 hardware platform introduced by SRAN5.0 and added back into SRAN3.0, including the RRU3908 V2 and MRFU V2 (software upgrade in SRAN6.0 expands GSM MRFU V2 P900 module instantaneous transmit bandwidth to 25 MHz); the V3 hardware platform introduced by SRAN6.0 including the RRU3929, RRU3928, MRFUe, MRFUd, and MRFU V3. Note that V3 introduces the first macro base station dual-transmit module, the MRFUd. 2.

Module specifications

See the SRAN6.0 Multi-mode BTS Product Specification for hardware support capability of the SDR RFU/RRU. The RRU3908 V1 and MRFU V1 provide hardware ready GSM/LTE dual-mode support, although software support is currently not planned. The SRAN 2.0G5U1 unshared PA specification is currently not implemented and cannot be used in projects. This specification is not used in current networks and promotion may continue to use the original specifications. G5U1 configuration is supported in SRAN3.0 and later versions. 3.

MSR standard

GSM, UMTS, and LTE shared PA concurrency must comply with the Multi-Standard Radio (MSR) protocol. Until the MSR protocol is adopted by the ETSI in 2012 Q1, only GU unshared PA configuration and specifications are actively promoted for the xRRU/xRFU. First-line product managers should obtain shared PA specifications from the regional MKT. By December 2010, Huawei ensures MSR configurations meet 3GPP TS 37.104 V9.3.0 and 3GPP TS 37.141 V9.1.0, which is subject to change according to the European standardization process. If GU, GL, or UL comply with the MSR protocol and share PA, the feature Multi-Carrier Intelligent Voltage Regulation is not supported. Only single-mode base stations support this feature. 4. Issue V1.1(2012-05-15)

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In GSM configurations, the V2 900M or V3 900M/1800M SDR and GSM-only RFU/RRU modules support single-channel 1–3 TRX 8-PSK modulation with no power backoff. Consequently, assuming equal dual-channel RRU carrier configuration, the modules can support 1–6 TRXs with no backoff. RFU 4–6 TRXs and RRU 7–8 TRXs are promoted as "conditional no power backoff." Conditions: EDGE enhanced coverage must be used. See the GSM BTS solution guide for EDGE+ and VAMOS capacity and power backoff specifications. In UMTS or LTE configurations, no power backoff is required for the V2/V3 SDR and UMTS only RFU/RRU with 20 MHz or lower bandwidth (1001 configuration, DC+MIMO+64QAM). No power backoff is required for the V3 SDR with 40 MHz or lower bandwidth. See the UMTS NodeB solution guide for details. 5.

Frequency hopping restrictions

In GSM RF hopping, all frequencies in the frequency hopping group must be within the instantaneous transmit bandwidth. Otherwise, multiple frequency hopping groups are required. Network specifications review is required prior to project use. Note: Generally, the improvement due to frequency hopping increases as the number of frequencies within the frequency group increases. Likewise, anti-interference capability also increases. For example in the RRU3908 V2, if the frequency separation within a sector does not exceed 20 MHz, the two transmit channels of the RRU3908 can be configured within the same frequency hopping group with no RF hopping restrictions. If the separation exceeds 20 MHz, the 2 transmit channels must be configured to separate frequency hopping groups. RF hopping can only be achieved within a single frequency hopping group. 6.

Power consumption

See the SRAN6.0 Multi-mode BTS Product Specification regarding promotional specifications for power consumption of the entire system. Use the Base Station Power Consumption Tool, PCT, http://3ms.huawei.com/mm/docMaintain/mmMaintain.do?method=showMMDetail&f_id=SR 201101070042 for power consumption bidding and calculation.

1. For the U900 MRFUd/RRU3928/RRU3929 V3, the EVM value of the 5 MHz frequency on the band border is larger than that of the frequencies in the middle of the U900 band. Therefore, the frequencies in the middle of the U900 band are advised to be used to test the peak rate during verification tests. 2. When the U900 MRFUd/RRU3928/RRU3929 V3 is configured with two carriers, it is recommended that frequency spacing be smaller than 20 MHz. Consult the R&D personnel to determine whether frequency spacing of larger than 20 MHz can be configured in 10001 configuration. If UMTS frequency spacing is 22.5 MHz, the result of PIM3 intermodulation deteriorates the receiver sensitivity.

2.3.4 V3 RF Module, System Cabinet, and Software Version Relationships V3 platform RF modules must be used in SRAN5.2 or SRAN6.0. The following table lists the version mapping between cabinets and V3 platform RF modules. Issue V1.1(2012-05-15)


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Version mapping between cabinets and V3 platform RF modules

Cabinet Type

Cabinet Version 101

BTS3900

103 Ver. B 103 Ver. C

BTS3900L

202 Ver. B 202 Ver. C 301

BTS3900A

302 303 Ver. B 303 Ver. C

MRFUd

MRFUe

Not supported Not supported Supported Not supported Supported Not supported Not supported Not supported Supported

Not supported Not supported Supported Not supported Supported Not supported Not supported Not supported Supported

MRFU V3

WRFUd

RRU3929

RRU3029

NA

NA

NA

NA

Supported Supported Supported NA Supported Supported NA conditionally Supported Supported Supported NA

NA

Supported

NA

NA

NA

NA

NA

NA

Supported Supported Supported NA

NA

Supported

LRFUe

Supported conditionally

Supported

Supported conditionally

Supported Supported

301 NA

NA

NA

NA

NA

302 NA

NA

NA

NA

NA

303 Ver. B NA

NA

NA

NA

NA

303 Ver. C NA

NA

NA

NA

NA

NA NA

Supported conditi

DBS3900A

Supported Supported

"Supported conditionally" means that customers can use an RF module in a cabinet only when they accept relevant restrictions. Contact the R&D personnel for detailed restrictions. For details, see the 3900 Series SRAN Site Solution Guide of 2011.

The MRFUd cannot be used in old cabinets even when its power is 2 x 40 W after power backoff. If use of the MRFUd is required in a project, contact the R&D department for evaluation.

2.3.5 AC xRRU To facilitate electrical input and satisfy customer requirements for indoor installation scenarios, Huawei has developed this RRU with AC input support. The AC RRU does not support tower installation. It should not be actively promoted to operators, and the recommended AC solution applies the APM30H and DC RRU. RF KPIs are the same as those of the RRU DC module. Outdoor application requires configuration of the lightning protection box. One lightning protection box is configured for each AC RRU module.

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Table 2-1 AC xRRU specifications Size

485 mm (H) x 380 mm (W) x 280 mm (D) (with cover) 52 L

Weight

≤30 kg (with cover)

Input power

220 V AC (90 - 290 V AC)

Working temp

-40 - 45°C with 1120 W/ m2 solar radiation --40 - 50°C without solar radiation

Battery

Not supported

Maximum power

DC output: 420 W; AC output: 480 W

Installation method

Pole/wall

2.3.6 MRFU Networking Common Configuration 1.

Single RRU Single Sector 1 TX/2 RX Configuration

Under this configuration, one sector requires a dual-polarized antenna and supports only dual-antenna receive diversity. Figure 2-8 shows the GSM mode RF configuration when the MRFU supports a single sector. UMTS and GU can be configured in the same manner.

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Figure 2-8 The MRFU supports the 1 TX/2 RX configuration mode.

分集载波1～6

主集载波1～6 ANT_TX/RXA

ANT_RXB

LNA1_IN

RX filter

DUP

L N A 0

P A 0

L N A 1

MTRX

CPRI1 CPRI0 BBU

2.

Two MRFUs support one sector 1 TX/2 RX configuration

In this configuration, the two MRFUs share a dual-polarized antenna in a single sector. The TX/RX ports of the two MRFUs respectively transmit different carrier signals. The main and diversity received signals of each of the two MRFUs are output to the diversity receive input of the other antenna to support dual-antenna receive diversity. Figure 2-9 shows the GSM mode 1 TX/2 RX configuration when the two MRFUs support a single sector. UMTS and GU can be configured in the same manner.

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Figure 2-9 Two MRFUs support the 1T2R configuration mode.

Two MRFUs are required in the following scenarios (suppose MRFU V1 is used): 



The carrier configuration exceeds the capability of a single module. −

In GSM mode, the number of carriers is more than six.

−

In GU mode, the number of GSM and UMTS carriers is more than six.

−

The number of carriers in UMTS mode is more than four. Current supported capability is limited to two carriers.

Carrier frequency exceeds the capability of a single module. −

The carrier frequency configuration in GSM mode exceeds 15 MHz.

−

The GSM and UMTS carrier frequency configuration in GU mode exceeds 15 MHz.

−

The UMTS carrier frequency configuration exceeds 20 MHz.



The power configuration exceeds the capability of a single module.



MIMO

3.

RFU GU CPRI connection

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Figure 2-10 RFU GU CPRI connection application MRFU MRFU MRFU MRFU MRFU MRFU

B F A

WBBPd

GTMU WMPT

UPEU

MRFU GU 非MIMO单频3扇区

MRFU MRFU MRFU MRFU MRFU MRFU

B F A

WBBPd

GTMU WMPT

UPEU

MRFU MRFU MRFU MRFU MRFU MRFU

B F A

MRFU GU非MIMO 单频大于3扇区（WBBPd）

GTMU WMPT

WBBPd

UPEU

MRFU GU MIMO单频3扇区

When the SRAN5.0 MRFU works in GU MIMO mode, the CPRI adopts the dual-star connection mode. In this case, consider to use only the WBBPd board. The WBBPd must be added in upgrade of SRAN3.0 non-MIMO to MIMO scenarios to replace the existing WBBPb. The WBBPd is placed in slot 0 by default.

2.4 Auxiliary Devices The auxiliary devices of the 3900 series multi-mode base stations include the BTS3900 mid-size indoor macro base station cabinet, BTS3900L large indoor macro base station cabinet, PS48300 indoor power supply cabinet, RRU indoor L-shaped standing frame, APM30H or RFC outdoor macro cabinet, battery backup cabinet (BBC), and TMC11H DC transmission cabinet. Table 2-2 Mapping between the multi-mode version and auxiliary devices Multi-mode version

Device

BTS Type

SRAN5.0

Indoor macro system cabinet, indoor macro large cabinet, indoor power supply cabinet (PS48300), and IMB

BTS3900 and BTS3900L

Hot swappable APM30H/TMC11H, RFC, IBBS200D, and IBBS200T

BTS3900A

Hot swappable APM30H/TMC11H, IBBS200D, and IBBS200T

DBS3900

L-shaped standing frame, PS48300 indoor power supply cabinet

SRAN5.0 adds the L-shaped standing frame

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The breathable film APM30 has been switched to the hot-swappable APM30H.

2.4.2 Indoor BTS3900 A single indoor macro mid-size cabinet can be configured with at most six RFUs and one BBU. A single site supports at most two BTS3900 cabinets. In GU dual-mode scenarios, a single site supports at most 12 MRFUs. Of these, fewer than 6 can operate in GU dual mode, while the remaining MRFUs can operate only in GSM or UMTS mode. This is determined by the number of CPRI ports. In GL dual-mode scenarios, a single site supports at most 12 MRFUs, which may be simultaneously configured in GSM and LTE dual mode. LTE BBU configuration limitations should not be exceeded. When the MRFU operates in a single mode, a base station supports at most 12 MRFUs.

Stacked installation of two cabinets does not support stacking of -48 V and 24 V/220 V cabinets. Only -48 V cabinets can be stacked. -48 V system cabinets provide 2U of user equipment space, while 220 V and +24 V cabinets do not provide user equipment space. The BTS3900L can replace dual-cabinet stacked installation.

2.4.3 Indoor BTS3900L SRAN3.0 adds support for the BTS3900L indoor large system cabinet, which allows installation of at most 12 RFUs and 2 BBUs. It supports only -48 V DC input. In case of no AC backup power or +24 V power input, the AC BTS3900 or +24 V BTS3900 is recommended. AC backup power uses the external power supply system.

2.4.4 Indoor PS48300 Power Supply Cabinet Multi-mode base stations can be used with the PS48300 indoor power supply cabinet. The PS48300 is suitable for scenarios in which the operator requires 220 V AC power supply and -48 V backup power. Power supply capability reaches 300 A and supports dual-AC input.

2.4.5 APM30H The Advanced Power Module (APM30H) is an outdoor integrated backup power supply system, which provides distributed base stations and outdoor macro base stations with -48 V DC power and battery backup capability. It also provides installation space for the BBU3900 and user equipment to satisfy requirements of rapid network deployment.

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The APM30 currently offers two types of specifications: hot-swappable APM30H and breathable film APM30. Sales of the APM30 have stopped and switched over to the APM30H. Table 2-3 APM30H technical specifications Parameter Engineerin g metric

Metric Exterior dimensions (W x H x D) (not including the installation base)

600 mm x 700 mm x 480 mm

Weight (not including batteries or user transmission equipment)

< 65 kg

Working temperature

--40°C to 45°C (including 1120 W/m2 solar radiation) --40°C to 50°C (not including solar radiation)

AC input

176 V AC to 290 V AC (specified voltage is 200 V AC to 240 V AC, 50/60Hz)

Output voltage

176/304 V AC to 290/500 V AC (specified voltage is 200/346 V AC to 240/415 V AC, 50/60Hz) 90/180V AC to 135/270V AC (specified voltage is 100/200V AC to 120/240V AC, 50/60 Hz) 105/176 V AC to 150/260 V AC (specified voltage is 120/208 V AC to 127/220 V AC, 50/60Hz) Input voltage frequency

40 Hz to 65 Hz

DC output

Output voltage range

-58 V DC to -44 V DC

Equipment installation space

Total space

7U

Internal -48 V 24 Ah battery

Occupies 2U and is configured based on backup power requirements; the 302 hot-swappable module does not support internal battery configuration.

AC Heater

Occupies 1U and optional; In environments with -20°C or lower temperatures the AC heater must be configured.

BBU3900

Occupies 2U and is required by the multi-mode solution

The distance between the RRU and the BBU should not exceed 100 m. Power supply distances exceeding 100 m require a specialized solution. A single APM30H cabinet supplies power to only six RRUs. Two power supply cabinets must be configured if the number of RRUs in a single site is more than six. Issue V1.1(2012-05-15)


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See the BTS3900A switchover PCN on 3ms regarding APM30H switchover issues. APM30 short-term backup power functions using the internal 24 Ah battery are not actively promoted.

2.4.6 RF Cabinet (RFC) The RFC is used in outdoor environments through stacked installation with the APM30H. It provides the XRFU and BBU3900 with power distribution, lightning protection, and other protective functions. It uses the direct ventilation heat dissipation mode. At most six xRFUs can be installed in each RFC.

2.4.7 Backup Battery Cabinet (BBC) The BBC is suitable for use in scenarios with backup power requirements and provides distributed and macro base stations with backup power of -48 V/50 Ah, -48 V /92 Ah, or -48 V/184 Ah. Battery pack specifications are -48 V/50 Ah and -48 V/92 Ah.

One BBC can provide power to two APM30 cabinets. In this case, the two battery packs are installed in the same battery compartment, but each APM30 cabinet manages the charge and discharge of its own battery back.

2.4.8 DC Transmission Cabinet (TMC11H) The DC TMC11H transmission cabinet is suitable for use in scenarios in which the operator requires -48 V backup power. It also provides distributed and outdoor macro base stations with installation space for the BBU3900 and user equipment. The TMC and APM30H are based on the same platform and provide space for 11U of user equipment.

2.4.9 L-Shaped Support The L-shaped support contains two components: RF rack and baseband frame. The RF rack supports centralized installation of at most six RRUs. It can serve as an open rack or support floor device installation. The baseband frame is a 3U insertion subrack, which supports internal installation of BBU, DCDU, and power supply systems. The L-shaped support supports -48 V power supply by default. Through internal installation in the baseband frame of the EPS4890 (AC/DC) or EPS48100D (DC/DC), it provides AC (without backup power) or +24 V power supply. The RF rack and baseband frame can be used together or separately.

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Figure 2-11 L-shaped support structure

Table 2-4 RF rack specifications of the L-shaped support No.

Item

Specification

Notes

1

Total system dimensions

600 x 600 x 1730 (W x D x H)

Installation rack dimensions

2

Total system weight

RF rack weight: 50 kg

Power supply mode

-48 V: DCDU-03

3

Baseband frame weight: 10 kg

+24V: EPS48100D 220 V/110 V dual-live-wire input: EPS4890

4

Environmental specifications

6

Module dimensions

The specific dimensions of the RRU module exterior cannot exceed 485 mm x 380 mm x 140 mm.

7

Installation method

Floor installation

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Table 2-5 Baseband frame specifications No.

Item

Specification

1

Total system dimensions

Single baseband frame:

2

Total system weight

Set weight is 12 kg (including BBU installation subrack and plastic casing)

3

Power supply mode

-48 V: DCDU-03

Notes

560 mm (H) x 425 mm (W) x 180 mm (D)

+24 V: unsupported 220 V/110 V dual live-wire input: EPS4815

4

Environmental specifications

-20 to 50°C

5

Installation method

Floor installation, wall installation

2.4.10 3900 Series Cabinets (Ver. C) Huawei has carried out system cabinet optimizations to support the application of high-power V3 RF modules. This optimization focuses on increasing the overall cabinet heat dissipation and power supply capabilities. The Ver. C system cabinet contains a high-power fan with increased fan speed. It also contains an enhanced DCDU (12 A -> 25 A) and PSU (4830 -> 4850, 1600 -> 2900 W). Cabinet air channels are also changed to separate the BBU and RFU air channels. This prevents air emitted from the BBU from affecting the air intake temperature of the RRU. See the relevant PCN for details. The cabinet exterior, dimensions, engineering installation interfaces, and name do not change after the optimization. After the switchover, indoor BTS3900 system cabinets support -48 V power supply input. The newly-developed internal 3U EPS48150 power supply system supports AC power supply but does not support +24 V DC input. After the switchover, the BTS3900L system cabinet supports only -48V power input. No internal power supply is installed in the cabinet. The BTS3900L supports AC input scenarios through the external power supply system or BTS AC system cabinet. User engineering interface switch requirements: The BTS3900 requires the operator provide 2 x 80 A or 1 x 160 A power input. The BTS3900L requires 4 x 80 A or 2 x 160 A power input. A single BTS3900 Plus system cabinet can configure at most six RFUs and two BBUs. The internal BBU power supply module supports at most 400 W. Therefore, a single BBU requires two power supply modules to support 650 W power consumption and requires dual power input. A single mid-size system cabinet requires at least an 11-way circuit breaker: RFU = 6 x 25 A, FAN = 1 x 25 A, 2 x BBU = 4 x 25 A. The 10-way internal DCDU cannot satisfy this requirement, and second DCDU must be configured. See the two BBU configuration in Figure 2-12.

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A single BTS3900 cabinet supports at most six RFUs and two BBUs. A single DCDU can supply only three-way power distribution to two BBUs. The system cabinet supports at most one 650 W BBU and one 360 W BBU. Providing an additional DCDU allows support for a second 650 W BBU. The BTS3900L cabinet supports at most 12 RFUs and 2 BBUs to satisfy three-mode application. Figure 2-12 BTS3900 DC system cabinet BBU configuration (from left to right configuration of BBU 1 and 2)

Figure 2-13 BTS3900L DC cabinet BBU configuration

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Improved outdoor cabinet types include: APM30H heat exchanger type outdoor power supply cabinet, RFC direct ventilation outdoor RF cabinet, IBBS200D direct ventilation outdoor battery cabinet, IBBS200T TEC outdoor battery cabinet, and TMC11H heat exchanger outdoor transmission cabinet. A single BTS3900A cabinet supports at most six 2 x 80 W RFU modules. The DBS3900 power supply system supports at most six 2 x 60 W RRU modules. The APM30H supports internal configuration of at most one 650 W BBU. The BTS3900A using the 150 A power supply system configures three PSU modules. The power of a single PSU module is 2900 W and its power conversion efficiency is 96%. The APM30H does not provide an AC total air switch. The device total air switch is provided through customer engineering interfaces. For more details, see the switchover PCN for each system cabinet. The Ver. C system cabinet support of each software version is as follows: Software Version

BTS3900 New Cabinets

BTS3900L New Cabinet

BTS3900A New Cabinet

GBSS8.1/RAN 10C01B65 and later/SRAN2.1

Supported

Unsupported

Supported

1. No support for cabinet electronic labels

1. No support for cabinet electronic labels

2. No support for PSU electronic labels (BTS3900 AC)

2. No support for PSU electronic labels (BTS3900A AC)

3. No support for PSU software upgrade and loading (BTS3900 AC)

3. No support for PSU electronic upgrade and loading (BTS3900A AC) 4. No support for IBBS200D/200T interface display

GBSS9.0/RAN 11.1/SRAN3.0 GBSS9.0/RAN 11.1/SRAN3.1 [limited releases]

Supported

Supported

Supported

1. No support for PSU electronic labels (BTS3900AC)

1. No support for PSU electronic labels (BTS3900A AC)

2. No support for PSU software upgrade and loading (BTS3900 AC)

2. No support for PSU software upgrade and loading (BTS3900A AC)

Supported

Supported

No support for PSU software upgrade and loading

No support for PSU software upgrade and loading (BTS3900A AC)

GBSS12.0/RA N12/eRAN2.0/ SRAN5.0 GBSS12.2/RA N12.2/eRAN2. 0/SRAN5.2[li mited releases] GBSS13.0/RA N13.0/eRAN2. 1/SRAN6.0

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Table 2-6 Comparison between BTS3900 and BTS3900 Ver. C BTS3900

BTS3900 Ver. C

-48 V

AC

+24 V

-48 V

AC

+24 V

User space

2U+1U

None

None

3U

None

None

BBU (650W)

1

1

1

1 (Support for the heat dissipation capabilities of two BBUs)

1

1

RFU

6 (small power)

6 (small power)

6 (small power)

6 (large power)

6 (large power)

6 (small power)

Power distribution

6 x 12 A: RFU 1 x 12 A: FAN 2 x 12 A: BBU 1 x 25 A: reserved Parallel terminals, which cannot be made on site

6 x 25 A: RFU 1 x 25 A: FAN 2 x 25 A: BBU 1 x 25 A: reserved

1 x 80 A, 16 mm2

1 x 160 A, 35 mm2 or 2 x 80 A, 16 mm2

Power interface box

220 VAC, three-phase: 25 A/3P, 2.5 mm2 220 VAC single-phase: 50 A/2P, 6 mm2

2 x 100 A or 1 x 160 A, 25 mm2

Hot-swappable terminals, which can be made on site 220 VAC three-phase: 25 A/3P, 2.5 mm2 220 VAC single-phase: 50 A/2P, 6 mm2

2 x 100 A or 1 x 1 A, 25 mm2

Table 2-7 Comparison between BTS3900L and BTS3900L Ver. C BTS3900L

BTS3900L Ver. C

-48 V

-48 V

User space

2U

2U

BBU (650W)

2

2 (Support for the heat dissipation capabilities of three BBUs)

RFU

12 (small power)

12 (large power)

Power distribution

Two DCDUs, each having the following specifications: 6 x 12 A: RFU 1 x 12 A: FAN 2 x 12 A: BBU 1 x 25 A: reserved Parallel terminals, which cannot be made on site

Two DCDUs, each having the following specifications: 6 x 25 A: RFU 1 x 25 A: FAN 2 x 25 A: BBU 1 x 25 A: reserved

1 x 80 A, 16 mm2

1 x 160 A, 35 mm2 or 2 x 80 A, 16 mm2

Power interface box

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Table 2-8 Comparison between BTS3900A and BTS3900A Ver. C BTS3900A

BTS3900A Ver. C

-48 V

AC

-48 V

AC

User space

9U

5U

9U

5U

Heat dissipation

700 W

700 W

1050 W

1050 W

BBU (650W)

1

1

1

1

RFU

6 (small power)

6 (small power)

6 (large power)

6 (large power)

Power distribution (APM)

7 x 12 A + 2 x 6 A

1 x 100 A (1P circuit breaker) 2 x 80 A (1P circuit breaker) 1 x 25 A (1P circuit breaker) 4 x 15 A (FUSE) 4 x 5 A (FUSE)

6 x 25 A + 2 x 12 A + 2 x 6 A

1 x 80 A (2P circu 1 x 30 A (1P circu 2 x 63 A (2P circu 2 x 25 A (1P circu 6 x 15 A (FUSE)

Power interface box

1 x 80 A, 16 mm2

220 VAC three-phase: 25 A/3P, 2.5 mm2 220 VAC single-phase: 50 A/2P, 6 mm2

1 x 160 A, 35 mm2 or 2 x 80 A, 16 mm2

220 VAC three-ph A/3P, 2.5 mm2 220 VAC single-p A/2P, 10 mm2

Table 2-9 Comparison between DBS3900 and DBS Ver. C DBS3900

DBS3900 Ver. C

-48 V

AC

-48 V

AC

User space

9U

5U

9U

5U

Heat dissipation

700 W

700 W

1050 W

1050 W

BBU (650W)

1

1

1

1

RRU

6 (small power)

6 (small power)

6 (large power)

6 (large power)

Power distribution (APM)

6 x 20 A + 3 x 12 A

1 x 100 A (1P circuit breaker) 6 x 20 A (1P circuit breaker) 1 x 25 A (1P circuit breaker) 4 x 15 A (FUSE) 4 x 5 A (FUSE)

10 x 25 A

1 x 80 A (2P circu 1 x 30 A (1P circu 6 x 25 A (1P circu 2 x 25 A (1P circu 6 x 15 A (FUSE)

Power interface box

1 x 80 A, 16 mm2

220 VAC three-phase: 25 A/3P, 2.5 mm2 220 VAC single-phase: 50 A/2P, 6 mm2

1 x 160 A, 35 mm2 or 2 x 80 A, 16 mm2

220 VAC three-ph A/3P, 2.5 mm2 220 VAC single-p A/2P, 10 mm2

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3

INTERNAL

Features and Solutions

3.1 Key Features SRAN1.0 was released in 2008 Q4 as the first version to support SDR RF modules. It primarily served to provide a multi-mode co-cabinet sales solution and support for SDR RF modules. SRAN1.0 provided only a solution foundation and was primarily oriented toward test. Aside from a small number of projects approved by HQ, it was not formally released or sold commercially. SRAN2.0 (GBSS8.1/RAN10.1) was the first dual-mode commercial release. The solution and features of SRAN2.0 are entirely based on GBSS8.1, RAN10.1, and special dual-mode functions. For detailed feature information, refer to the dual-mode feature list and description. SRAN2.0 supports: xRRU V1, xRFU V1, IP co-transmission, and dual-star connections. SRAN3.0 (GBSS9.0/RAN11.1) supports: RRU3908 V2, MRFU V2, BTS3900L, and WBBPd. SRAN3.0 supports WBBPd configuration but does not support new functions such as UMTS uplink 16QAM. It is not advertised to customers. In case of WBBPd requirements, encourage customers to install SRAN5.0. SRAN3.1 (GBSS9.0/RAN11.1) supports the following features: RRU3908 V2 configuration of at most four carriers for each channel in UO mode; presenting old system cabinets in the network management interface as virtual cabinets to facilitate operations and maintenance (OM); 900M MRFU V2 GO 80 W single carrier configuration, which is not promoted worldwide and only targets Latvia; and GBTS USB configuration of PPP/MP local and peer IP addresses to facilitate BTS connections when the PTN does no support dynamic IP address allocation. SRAN3.1 includes only the requirements of certain projects and is not a worldwide release. SRAN5.0 (GBSS12.0/RAN12.0/eRAN2.0) supports the following features: GL dual-mode SDR, which is not yet actively promoted since the MSR standard has not been adopted by ETSI; UL co-cabinet, which has reached TR5; GU dynamic power sharing; new WBBPd software features; GSM/UMTS linked intelligent power-off based on priority levels; GL/UL co-transmission; clock sharing; and further improvement to the "Co" software features. SRAN5.2 (GBSS12.2/RAN12.1/eRAN2.0) supports the following features: 850M MRFU V2; reuse of BTS3012 system cabinets by emptying out or mixed insertion to support GU co-cabinet and dual mode. In cabinet emptying scenarios, the DTMU/DTRU is emptied and the BBU3900+MRFU/RRU3908/RRU3801C/RRU3806 are inserted. In mixed insertion scenarios, the BBU3900+MRFU are inserted into empty or idle transmission slots of the 3012 cabinet. SRAN5.2 is compatible with V3 modules and the Ver. C system cabinet. It maintains compatibility with the 900M MRFU V2 GO 80 W single carrier configuration. SRAN5.2 includes only the requirements of certain projects and is not a worldwide release. Issue V1.1(2012-05-15)


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SRAN6.0 (GBSS13.0/RAN13.0/eRan2.1) supports the following features: GUL three-mode co-cabinet commercial deployment; V3 platform RF modules; MRFU/MRRU V2 specification improvements; LTE dual-carrier mode; Ver. C system cabinets with V3 modules; GU dynamic frequency sharing to TR5; GU 2.0 MHz static bandwidth frequency separation; power locking; and G/MRFU V2 P900M module instantaneous transmit expansion to 25 MHz through software upgrade; UMTS MIMO VAM including UO and GU simultaneous transmit in the 900M/850M/1900M RRU3908 V1. The BTS3900L supports BBU co-cabinet installation and supports GSM, UMTS, and LTE fan temperature speed control. The network management interface is based on independent site management. Reused cabinets are virtual cabinets on the network management interface. SRAN6.1 (GBSS13.1/RAN13.1/eRAN2.2) supports the following features: GU900 and GL1800 SDR modules connected to different BBUs by using the UCIU board; GSM dual-band Co-BCCH; and UL dual mode (limited to the RRU3929, newly developed 20 MHz duplexers are used only in Japan). In addition, SRAN6.1 supports BTS3012, BTS3012 II, BTS3012AE and BTS3900/BTS3900L/BTS3900A shared sites, which include GRFU modules inserted in 3012 series system cabinets as well as separate 3900 cabinets. In terms of services, the BTS3012 and BTS3900 are same frequency synchronized cells (requires dual antenna feeders) or different frequency synchronized cells (co-BCCH). The shared 3012 and 3900 site is treated as two separate sites in terms of maintenance and logic. After site combination, the BTS3900, BTS3900L, and BTS3900A support GU BBU sharing. The outdoor macro base station BTS3900AL is supported. A single BTS3900AL cabinet supports 9 RFUs, 9 RRUs, and 2 BBUs. The BTS3900AL cannot be used together with eFUSE, APM30, and IBBS200D. The IBBS700D/T cannot be used together with the BTS3900A or DBS3900. The TP48600A cannot be used together with the BTS3900A DC or DBS3900. SRAN6.1 includes only the requirements of certain projects and is not a worldwide release.

3.2 Solutions and Services 3.2.1 GU Dynamic Spectrum Sharing (DSS) After SRAN6.0 is introduced, the GSM network primarily carries voice service, while the UMTS network primarily carries data service. Voice and data service are characterized by staggered distribution of busy and idle times. During periods of voice service idle time, the GSM network shares a portion of relatively idle spectrum resources with the UMTS network. These spectrum resources are used to increase the data service capacity of the UMTS network. This feature is controlled and triggered based on time and GSM service volume. GU DSS has reached TR5 and can support operator testing. Functional restrictions: 1.

GU DSS is applied in suburban or rural scenarios. To lower delivery risk, SRAN6.0 implements only spectrum sharing across linked network slices.

2.

Base station status: This feature is used only in GU multi-mode base stations. Before adoption of the MSR standard, the GU shared antenna feeder can be used only in scenarios with no shared GU PA. Note: MRFU V3 dual-transmit modules can be divided based on PA, while single-transmit modules must be divided based on GSM or UMTS modules.

3.

GU DSS configures separate MAs and 1x1 frequency reuse. The primary BCCH and CCCH carriers are not included in spectrum sharing. The PDCH avoids occupying shared-spectrum frequencies.

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G900+U900'->G900+U900+U900'; G900+U2100->G900+U900+U2100 RRU3908 V1/V2, RU3929, RRU3928, MRFU V1/V2, MRFUe, and MRFUd The GSM band must be 9 MHz or larger, and only GSM 900M is supported. GSM can share 5 MHz, 4.6 MHz, or 4.6 MHz with UMTS, and the shared bandwidth must be contiguous. This feature permits dynamically adding or removing UMTS frequencies. Performance restrictions: The PA is shut down for a fraction of a second during the carrier transition period when modes are activated or deactivated. A 1s power increase follows during which the actual power is at most 10 dB lower than the labeled power. Then multiple seconds of DPD reduction increases the noise floor. The 1s power increase and multiple seconds of DPD reduction may adversely affect the network, causing dropped calls and degradation of service quality. The GSM network is planned as dual MA. The basic GSM spectrum uses one MA, while the other can be shared with UMTS.

3.2.2 GSM/UMTS Small Frequency Separation Communications frequency resources represent a limited resource to operators. This problem is compounded by explosive growth in 3G and 4G spectrum requirements. The imbalance between supply and demand is especially prominent in high-quality frequency bands such as the 900 MHz band. Many operators are unable to allocate 5 MHz from the 900 MHz band, but competitive pressure forces them to develop new 900 MHz services. To these customers, investment in small frequency separation is worthwhile even if it causes some KPI degradation. Through wave filter and algorithmic improvements, Huawei 4.2 MHz solution minimizes this type of interference with good results. However, these algorithmic and hardware improvements only reduce impact of this feature on dropped calls. They cannot eliminate the root of such impact. Huawei applies the following preconditions to 4.2 MHz bandwidth in Australia's Opus network. It is deployed in suburban areas with a low density of users. The operator's KPI requirements are also low, and the operator has performed experimental evaluation using various types of terminals. The operator is willing to accept a certain level of dropped calls. First-line staff should attempt to apply standard 5 MHz bandwidth whenever feasible. There is a risk of dropped calls unless all terminals are specially manufactured for 4.2 MHz. Operators must balance KPI and bandwidth requirements. If the operator wants to deploy GSM/UMTS small frequency separation, it must first accept degradation of certain KPIs. During network planning, the operator must also purchase Huawei high-value network planning service, that is, unless the operator possesses superior network planning capacity and is confident in its ability to implement 4.2 MHz carrier bandwidth. First-line staff must understand that 4.2 MHz network deployment places high requirements on network planning human resources. Staff must clarify whether the operator is willing to pay for additional network planning services. SRAN2.0 supports only 2.6 MHz frequency separation, while SRAN3.0 supports 2.2 MHz separation. SRAN6.0 introduces 2.0 MHz frequency separation. 3.8 MHz application scenarios: 1.

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The same operator provides GSM and UMTS modes. The GSM and UMTS modes are both deployed to Huawei base stations, and RAN sharing is not used. The base stations contain small bandwidth applications. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd

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2.

This solution is restricted to rural scenarios which provide broad GSM coverage and low capacity. It supports only GU dual-mode base stations and requires GU sandwich frequency allocation, that is, the UMTS spectrum is sandwiched inside the GSM spectrum. It is not suitable for services with high QoS requirements.

3.

GSM and UMTS share the 900/850 MHz band with a spectrum bandwidth of 6 - 8 MHz. GSM generally configures at most S222. For spectrum bandwidth higher than 8 MHz, the 4.2 MHz small frequency separation feature is recommended.

4.

Hardware dependencies: MRFU 900M V2/V3, RRU3908 900M V2/V3, RRU3908 850M V2, and RRU3908 900M V1. A trial version will be provided by the end of February 2011. 3.8 MHz functional restrictions:



External specifications should prohibit both static and dynamic 3.8 MHz in HSPA+ scenarios.



GU 2.0 MHz small separation GSM ARFCNs can only be used for non-main-BCCH carriers and should enable frequency hopping. In addition, the GSM PDCH and SDCCH must not be configured to 2.0 MHz small separation ARFCNs.

Performance restrictions: 1.

In refarming scenarios, UMTS performance is ordered as follows: 5 MHz > 4.6 MHz > 4.2 MHz > 3.8 MHz.

2.

Average network-level uplink and downlink rates are 5% lower in UMTS 4.2 MHz than 5 MHz. UMTS 3.8 MHz rates are 10 - 15% lower than UMTS 5 MHz. UMTS MOS is reduced by approximately 0.2.

3.

GSM performance impact: EDGE rates are reduced by 15% and MOS falls by 0.1.

Figure 3-1 GSM/UMTS 2.0 MHz frequency separation

3.2.3 Macro + Distributed Configuration SRAN3.0 supports the following BTS3900, BTS3900L, and BTS3900A macro and distributed base station types: GO (macro) + UO (distributed), GU (macro and mixed) + UO (distributed), and 6 RFU + 6 RRU. SRAN5.0 supports simultaneous GSM mode configuration in macro and distributed base stations, which depends on the GTMUb and the UBRI board for GSM RRU access. Based on limitations of cabinet output cables and BBU CPRI interfaces, 6 RFU + 6 RRU configuration is promoted externally. Specific system cabinet support is as follows: For the BTS3900 or BTS3900L, a single BBU in single or dual mode supports 6 RFU + 6 RRU configuration in one cabinet. Dual BBUs in BTS3900L three-mode single-cabinet or BTS3900 three-mode dual-cabinet configuration support 12 RFUs + 6 RRUs. For the BTS3900A, a single BBU in single or dual mode supports 6 RFU + 6 RRU configuration in one cabinet. Dual BBUs in three-mode dual-cabinet configuration support 6

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RFU + 6 RRU configuration. This only applies to 303 cabinets or later. The 301 and 302 cabinets do not provide support. Macro + distributed configuration applies to dual-mode dual-frequency network scenarios. These scenarios primarily include European and African 900M/1800M dual-frequency networks, Latin American 850M/1900M dual-frequency networks, and, in particular, scenarios in which 3G distributed deployment results in 2G macro BTS relocation. In BTS3900, BTS3900L, and BTS3900A macro + distributed deployment, the DBS3900 can be connected remotely to the main BTS3900 by up to 12 fiber optic lines. RRU power source cables may draw lightning. In addition, cabinets possess limited space for cables. Consequently, the RRU power supply requires an external DCDU-03B, which is installed on a wall or within the 19 inch system cabinet. The machine room power supply cabinet separately supplies power. This is shown in Figure 3-2. BTS3900A macro + distributed DC scenarios configure the TMC cabinet, and the DCDU-03B can be installed internally. AC scenarios require the RRU to configure a separate APM power cabinet as shown in Figure 3-2. Figure 3-2 Indoor macro and outdoor macro + distributed configuration

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GSM only and same-band macro + distributed configurations are not supported. The DBS should perform processing. The SRAN template of the configuration tool supports use of the SDR RRU in GSM only BTSs. The GSM only template does not provide support. 6 RFU + 6 RRU in the promotion specifications can be single-mode or dual-mode RF modules. "6 RFU + 6 RRU" indicates the maximum configuration of 6 RFUs and 6 RRUs. Configurations, such as 9 RFUs and 3 RRUs, are not supported. Cabinets can be old cabinets or Ver. C cabinets. In GSM mode, when macro+distributed configurations are used, a UBRI board needs to be configured to connect to RRUs (the GTMU is connected to RFUs). In UMTS mode, when the number of required CPRI ports is less than or equal to six, RFUs and RRUs share the same baseband board; when the number of required CPRI ports is larger than six, RFUs and RRUs are connected to different baseband boards. In LTE mode, if one baseband board supports macro+distributed configurations, RFUs and RRUs share the baseband board. Otherwise, RFUs and RRUs are connected to different baseband boards.

3.2.4 Three-mode shared sites Introduced in SRAN6.0, a three-mode shared site refers to a single site that simultaneously supports GSM, UMTS, and LTE modes. It is implemented through two BBUs with each BBU supporting at most two modes. Physical installation is based on co-cabinet installation, that is, a shared system cabinet, or on non-shared cabinet mode. The network management interface presents the shared site as a single site. SRAN BBUs do not require interconnection. Issue V1.1(2012-05-15)


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All monitoring components are connected to BBU0 and are managed only by BBU0. BBU1 has no monitoring relationship with the cabinet and cannot receive PMU electric supply power off signals. Consequently, it does not support multi-mode coordinated intelligent power-off features including Low Power Consumption Mode/LOFD-001040, Multi-Carrier Switch off Based on Power Backup/WRFD-020119, and Active Backup Power Control/GBFD-111605. All fan speed control modes must be configured as temperature-based speed control. Noise increases by approximately 3 - 6 dB at 45°C. Three-mode implementation in SRAN6.1 uses the non-interconnected BBU mode by default. The BBUs are interconnected only in cross-BBU CPRI dual-star scenarios, as shown in the figure below. The two BBUs are interconnected through the UCIU board. The UCIU provides the two BBUs with clock and IDX1 (for exchange of OM and transmission data) channels. Figure 3-3 GU 900M RRU + GL 1800M RFU dual-star configuration

The monitoring connection is the same as in non-interconnected mode; however, master fan speed control mode is enabled. In addition, this mode supports multi-mode coordinated intelligent power-off features. Table 3-1 Multi-mode shared site scenarios Combined mode (BBU0 + BBU1)

Mode

BBUs

BBU Connections

SRAN Supported Version

GU

Dual mode

1

N

3.0

GL

Dual mode

1

N

5.0

UL

Dual mode

1

N

5.0 supports co-cabinet, while 7.0 supports co-mode

GU + LO

Three mode

2

N

6.0

GL + UO

Three mode

2

N

6.0

GU + L (G)

Three mode

2

Y

6.1

GL + U (G)

Three mode

2

Y

6.1

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INTERNAL

GU+L(G) indicates that the SDR modules of GSM and LTE modes are connected to different BBUs with dual-star CPRI connections. The second BBU does not have a GTMU board, which is indicated by "(G)". In SRAN6.1, boards of a single mode must be installed in the same BBU. For example in GU 900M + GL 1800M scenarios, the GTMU board of one BBU supports GSM900/1800. Hardware dependency: RRU3929, RRU3928, MRFUe, MRFUd, and MRFU V3 support cross-BBU SDR connections. Three-mode base station specifications: 1.

The BTS3900L maximum external specification is 12 RFU, and the maximum supported configuration is 12 RFU + 6 RRU.

2.

The BTS3900 external specification is 12 RFU, and the maximum supported configuration is 12 RFU + 6 RRU.

3.

The BTS3900A external specification is 12 RFU or 6 RFU + 6 RRU with single-mode RRUs. The 12 RFU + 6 RFU solution is applied only in special cases.

4.

The DBS3900 supports a maximum of 12 RRUs.

As described above, in three-mode co-site or dual-mode BBU installation scenarios without the UCIU board, BBU1 is not connected to the power monitoring board. In the event of power outage or backup power operations, it is unable to obtain cabinet air switch capability or notify new and old cabinet types. It directly sends the air switch ineffective value to the 2 x 60 W WRFU/LRFU. The WRFU/LRFU then reduces power correspondingly by 3 dB to 5 dB. Note that the MRFUd/MRFUe are not affected by this issue, as they are only installed in Ver. C cabinets. The BTS3900L in versions earlier than SRAN6.0 does not support two BBUs. In triple-mode co-cabinet scenarios, if the two BBUs are installed in one BTS3900L cabinet, then two logical sites exist. Among all CPRI interface boards, only the WBBPa does not support inter-BBU CPRI dual-star connections. A UCIU must be delivered to support inter-BBU SDR. The UCIU is used only when SDR modules are connected using inter-BBU dual-star CPRI connections. If inter-BBU SDR is not used but the clock source or monitoring information needs to be shared between two BBUs, a UCIU can also be delivered.

3.2.5 Power Lock This feature is introduced in SRAN6.0 and supports power locking through local machine room and remote OMC operations, which require administrator privileges. This power lock feature is used in European networks with high electromagnetic radiation requirements. After site configuration in the commissioning stage, the power cannot be arbitrarily modified. Otherwise, the operator may face regulatory issues. Consequently, power locks are required to prevent improper operations. V3 platform hardware supporting the power lock feature includes: 1.

Multi-mode: RRU3929, RRU3928, MRFUe, and MRFUd

2.

GSM only: RRU3029

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3.

UMTS only: RRU3828, RRU3829, and WRFUd

4.

LTE only: RRU3221

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4

For internal use only

Topologies and Applications

4.1 Networking Capability 4.1.1 Position of the GSM+UMTS Dual-Mode Base Station in the Network The position of the GU dual-mode base stations in the network is nearly the same as that of the single-mode base station. The GU dual-mode base station can connect to a multi-mode BSC or separately connect to a GSM BSC and a UMTS RNC.

4.1.2 RNC/BSC and BBU3900 and Networking Capability RNC or BSC and BBU3900 support networking through star, tree, or chain network topologies. −

The Abis interface supports TDM and IP transmission protocols.

−

The Iub interface supports TDM, ATM, and IP transmission protocols.

See the SRAN6.0 GSM&UMTS<E 3900 Multi-Mode Base Station Transmission Solution regarding the GU, GL, and UL co-transmission and clock solution. GU, GL, and UL co-transmission scenarios allow configuration of at most two UTRP boards to expand the number of transmission ports. Port specifications are as follows: Table 4-1 Co-transmission scenario transmission ports Number of physical interface BBU ports in pool- E1 Shared Transmission interface ports in the BBU

Per board:

Per BBU:

8 for UMTS UTRP;

20 (WMPT + 2UTRP) (IP over E1, GU co-transmission)***;

LTE UTRP(IP over E1)

24 (GTMU + WMPT + 2UTRP) (TDM over E1, GU co-transmission)***; 20 (WMPT + 2UTRP) (GU co-transmission)

Number of physical interface BBU ports in pool- Electrical Ethernet Shared Transmission interface BBU ports

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Per board:

Per BBU:

4 for UMTS UTRP;

9 (WMPT + 2UTRP) (GU co-transmission)

2 for LMPT

2 (LMPT, GL/UL co-transmission)


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Number of physical interface BBU ports in pool- Optical Ethernet Shared Transmission interface BBU ports

INTERNAL

Per board:

Per BBU:

2 for UMTS UTRP;

5 (WMPT + 2UTRP) (WMPT has a single optical FE port, not a GE, GU co-transmission);

2 for LMPT

2 (LMPT, GL/UL co-transmission)

*** In IP over E1, the GTMU panel FE connects the WMPT and LMPT, and no external E1 interface is provided. In TDM over E1, the GSM E1 can also be added to the resource pool.

4.1.3 BBU3900 and SDR RFU/RRU Networking Capability Star, chain, and ring networking are supported between the BBU3900 and the RRU. Star networking is supporting between MRFUs. For specific networking modes, refer to the relevant GSM and UMTS solution guides. Networking specifications are shown in Table 4-2. Table 4-2 BBU and RRU networking specifications GSM mode

GU dual-mode

UMTS mode

Star

Yes

Yes

Yes

Chain

Yes

No

Yes

Ring

Yes

No

Yes

Number of cascading levels per port

SRAN2.0: 3

No

SRAN2.0: 4

Cascading distance

The maximum distance per level is 40 km, and the maximum total distance of six levels is 40 km

SRAN3.0: 6

SRAN3.0: 4 Single stage maximum is 40 km

The maximum distance per level is 40 km, and the maximum total distance of four levels is 100 km

CPRI interface networking: Regardless of whether SDR RFU/RRU modules are used, only dual-star connections between the BBU3900 and RFU/RRU are supported. Cascaded connection is not supported. Dual-star connection mode provides the advantage of allows the data of GSM, UMTS, and LTE to be transmitted on the respective CPRI optical cable of each mode. The three modes are decoupled to minimize the mutual impact of GSM, UMTS, and LTE. When dual-star connection is used, the data rates on the entire CPRI link must be the same. For example, if dual-star connection is used for GL SDR modules, the GTMUa board is used, and the maximum CPRI data rate is 1.25 Gbit/s, then the maximum LTE data rate is 1.25 Gbit/s. In this case, the LTE 2T2R configuration supports only 10 Mbit/s bandwidth. Currently, V3 RF modules can support various data rates on dual-star CPRI connections, but V1 and V2 RF modules do not support.

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INTERNAL

In UMTS mode, only slots 2 and 3 of the BBU3900 allow output connection with the CPRI interface of the RFU/RRU. SRAN5.0 CPRI feature enhancements: Adds the WBBPd: The panel supports six CPRIs and provides hardware support for dual-mode CPRI back panel forwarding. Adds the LBBPc: The panel supports six CPRIs, and the board provides 1.25 GHz/2.5 GHz self-adaptation.

4.1.4 Overview of OM The 3900 series base stations operating in different modes support multiple OM methods. In particular: −

When 3900 series base stations operate in GSM mode, the OM system is the same as that of GSM BTSs.

−

When 3900 series base stations operate in UMTS mode, the OM system is that of UMTS NodeBs.

−

When 3900 series multi-mode base stations operate in GSM+UMTS mode, the OM system is shown in Figure 4-1.

Figure 4-1 OM system networking

RNC: UMTS network controller BSC: GSM network controller

The 3900 series multi-mode base station OM system supports the following four OM platforms: BTS SMT, BSC LMT, NodeB LMT, and M2000. These platforms provide the 3900 series multi-mode base stations with a comprehensive OM solution. 

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INTERNAL

The PC of the BTS SMT can be connected to the 3900 series multi-mode base stations to maintain the GSM network. The functions of the BTS SMT in GU mode are the same as those in GSM only mode. 

BSC LMT The BSC LMT is used to perform OM of 3900 series multi-mode base stations operating in GSM mode. It provides the same OM functions as the single-mode BSC LMT.



NodeB LMT The NodeB LMT is used to perform OM of 3900 series multi-mode base stations operating in UMTS mode. It provides the same OM functions as the single-mode BSC LMT. To perform maintenance of a single UMTS NodeB, users can directly connect to the NodeB locally or access the NodeB remotely through the maintenance channel.



M2000 integrated OM The M2000 is the integrated WRAN and GBSS network management center. It allows for centralized maintenance of multiple NodeBs and BTSs. Functions include data configuration through the CME, alarm monitoring, performance monitoring, and software upgrade.

The M2000 displays multi-mode base stations as a single NE and performs management of the common multi-mode portions of the base station. It implements specific single-mode management functions based on logical NEs under the multi-mode base station NE.

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5


Upgrade, Expansion, Evolution, and Compatibility

5.1 Upgrade Capability Single-mode products such as the GRFU and RRU3008 cannot support multi-mode functions, for example, GU or GL dual mode, through software upgrade.

5.2 Expansion Capability Capacity expansion of 3900 series multi-mode base station modules is simple. RF modules such as the RFU or RRU require only software upgrade or configuration to expand capacity or move from single-mode to multi-mode function. The BBU3900 requires configuration of corresponding boards based on service. It may be necessary to add WBBP/LBBP baseband processing boards, add MPU boards, or add other boards.

5.3 Evolution Capability SRAN3.0 supports GU co-mode co-cabinet configuration. SRAN5.0 adds GL co-mode co-cabinet and UL co-cabinet (to TR5) configuration. SRAN6.0 adds single-site GUL three-mode application support. One BBU supports dual-mode application. SRAN6.0 achieves GUL three-mode co-sites through two BBUs. SRAN6.0 has yet to specify GL co-mode beta sites. Consequently, this feature is currently unable to move to GA and is not promoted in SRAN6.0. SRAN6.0 adds support for shared UMTS and LTE-TDD BBUs. The TR5 experimental deployment version was released on April 15, 2011. Large-scale commercial use is supported starting June 30, 2011. Supported scenarios include: 1) DBS3900: supports UL (TDD) co-cabinet configuration; 2) BTS3900 (UMTS) + DBS3900 (LTE) based on the following RRU types: initial testing with the RRU3211 and later commercial deployment using the RRU3232 (4T4R module used as 2T2R). Restrictions: 1)

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INTERNAL

2)

Separate transmission and IP co-transmission are supported.

3)

Existing network BBU configuration restrictions: The LBBP/WBBP support at most three modules.

4)

First-line staff must apply the standard version combination of RAN13.0 + eRAN2.1.

5.4 Forward Compatibility Capability N/A

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6


Reliability and Environment Adaptability

6.1 Reliability 6.1.1 System Reliability System reliability is greatly improved through reliability design including load balancing and redundant configuration as well as optimization of board and system fault detection and isolation technologies. 

Redundant design

System units including MPU, transmission, power supply, and fan units support redundant backup. The BBU supports load balancing. The CPRI interfaces between BBU and RFU/RRU modules support ring networking. If a CPRI link fails, automatic handover can be performed to another CPRI link. Key internal system data including software versions and data configuration files support redundant backup. 

Reliability design

The system automatically monitors and diagnoses software and hardware faults and environmental issues. It reports alarms and applies self-recovery measures to attempt automatic fault recovery. If self-recovery fails, the faulting unit is automatically isolated.

6.1.2 Hardware Reliability The 3900 series multi-mode base stations and Huawei 4th generation base stations share the same platform and hardware that are mature and stable. 

Prevention of improper board insertion

If a board is inserted into the wrong slot, it cannot connect to the back panel, which prevents equipment damaged. 

Protection from overheating

If the temperature near the RF module PA is too high, the system reports an overheating alarm and immediately shuts down the PA to prevent damage. 

Power supply reliability

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INTERNAL

The system provides power outage protection for programs and data. The power board provides power supply overvoltage, overcurrent, and reverse polarity protection 

Complete lightning protection design

The design of various system interfaces provides lightning protection. Interfaces include base station AC/DC power supply ports, various cabinet signal interfaces (E1, combined cabinet interface, and switch interface), antenna feeder interface, and GPS ports.

6.1.3 Software Reliability Software reliability functions include redundant backup of key files and data and powerful software fault tolerance capabilities. 

Data redundancy

Backup of key files and data including software versions and data configuration files prevents damage to files and data from affecting normal system operation. 

Software version redundancy

Partitioned backup of system software versions (including boot ROM versions) ensures that the system can revert to a backup version and continue operating normally if issues occur in software. 

Data configuration file redundancy

Partitioned backup of data configuration files ensures that the system can revert to a backup configuration file and continue operating normally if configuration files become damaged. 1.

Error tolerance capability

Software faults cannot cause total system collapse. That is, the system provides self-recovery functions. 

Scheduled monitoring of key resources

The system checks utilization of various software resources to ensure release of hanging resources and outputs related logs and alarms. 

Task monitoring

During software operation, task progress monitoring functions can detect various internal software errors as well as certain hardware malfunctions. When system abnormality is detected, an alarm is reported and self-recovery measures are executed to restore task operation. 

Data checks

The system performs scheduled or event-driven data consistency checks. It performs selective or priority-based data recovery and outputs relevant logs and alarms. 

Watchdog

In the event of abnormal software operations, the system can perform monitoring and automatic recovery through dual-level hardware and software watchdog functions.

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INTERNAL

6.1.4 Reliability Specification Refer to the relevant system reliability reports at http://3ms.huawei.com.

6.2 Environment Adaptability See the SRAN6.0 3900 Multi-Mode Base Station Product Description.

6.2.1 Surge Protection Specifications BTS3900 Ver. C

BTS3900

BTS3900L Ver. C

BTS3900L

BTS3900A Ver. C

BTS3900A

220 V power input

Differential mode 5 kA/Comm on mode 5 kA (surge current 8/20 us)

Differential mode 3 kA/Common mode 5 kA (surge current 8/20 us)

N/A

N/A

Differential mode 60 kA/Common mode 60 kA (surge current 8/20 us)

Differential m kA/Common (surge current

FE port

Differential mode 500 V/Commo n mode 4000 V(surge voltage (1.2/50 us))

Differential mode 500 V/Common mode 2000 V(surge voltage (1.2/50 us))



Common mode 1-wire 1 kA, 8-wire 6 kA (surge current 8/20 us)

Differential m kA/Common current 8/20 u

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7 1.

FAQ

What supporting documents are available for the product sales? How to obtain them? (Mandatory)

Answer: According to target users or usage scenarios, the marketing representative team provides complete pre-sales documentation, including sales guides, MBTS Product Specification, Product Description, Configuration Principles, and documents corresponding to SingleRAN@Broad. For details, download the latest document list from Mobile Product > SingleRAN or Mobile Product > Branding at http://3ms.huawei.com.

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8

References

1.

2011 Multi-Mode Base Station Sales Strategy Guide

2.

SRAN6.0 3900 Multi-Mode Base Station Product Description

3.

SRAN6.0 Multi-mode BTS Product Specification

4.

SRAN6.0 GSM&UMTS<E 3900 Multi-Mode Base Station Transmission Solution

5.

2011 3900 Multi-Mode Base Station Site Solution Guide

6.

Base Station Power Consumption Tool, PCT, http://3ms.huawei.com/mm/docMaintain/mmMaintain.do?method=showMMDetail& f_id=SR201101070042

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9


Acronyms and Abbreviations

APM

Advanced Power Module

BBC

Battery Backup Cabinet

BBU

BaseBand control Unit

DRFU

Double Radio Filter Unit

GATM

GSM Antenna and TMA control Module

GRFU

GSM Radio Filter Unit

GTMU

GSM Transmission &Timing & Management Unit for BBU

MTBF

Mean Time Between Failures

MTTR

Mean Time To Repair

PMU

Power and Environment Monitoring Unit

PSU

Power Supply Unit

RFC

Radio Frequency Cabinet

RFU

Radio Filter Unit

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3900 Series SRAN Base Station Solution Guide of 2011 V1.1(20110630)

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