3900 Series Multi-Mode Base Station Technical Description (V100R002_03)

3900 Series Multi-Mode Base StationV100R002

Technical Description

Issue 03Date 2010-10-25

HUAWEI TECHNOLOGIES CO., LTD.

Copyright Huawei Technologies Co., Ltd. 2010. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent 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. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase 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 representationsof any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute the warranty of any kind, express or implied. Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.comEmail: [email protected]

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About This Document

OverviewThis document describes the 3900 series multi-mode base stations in terms of systemarchitecture, topologies, transmission and clock schemes, and operation and maintenance.

Product VersionThe following table lists the product version related to this document.

Product Name Product VersionDBS3900 V100R002BTS3900 V100R002BTS3900L V100R002BTS3900A V100R002

Intended AudienceThis document is intended for:l Network plannersl Field engineersl System engineers

Organization1 Changes in the 3900 Series Multi-Mode Base Station Technical DescriptionThis chapter describes the changes in the 3900 Series Multi-Mode Base Station TechnicalDescription.

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2 OverviewThe 3900 series multi-mode base station launched by Huawei is a future-oriented product thatmeets customers' requirements for network evolution. The 3900 series multi-mode base stationuses Huawei's unified base station architecture comprising the BBU and RF modules. One suchbase station supports multiple RATs with the RF modules and boards of GSM, WCDMA,CDMA, WiMAX, and LTE installed in one cabinet. This enables the convergence of devices atthe base station, the sharing of site resources, and the unified OM. The 3900 series multi-modebase station is an ideal option for the evolution from the single-mode base station to the multi-mode base station.3 System ArchitectureThis chapter describes the system architecture of the 3900 series multi-mode base station.4 Network TopologiesThis chapter describes the transport network topologies and CPRI network topologies of the3900 series multi-mode base station.5 Transmission SchemesThe 3900 series multi-mode base station supports two transmission schemes: independenttransmission and co-transmission.6 Clock SchemesThe 3900 series multi-mode base station supports multiple external clock sources, including E1/T1 clock, BITS clock, GPS clock, IP clock, and clock synchronized over Ethernet. One RATcan use an external clock source independently or share the external clock source with anotherRAT. When external clock sources are unavailable, the base station continues to function for atleast 30 days in free running mode.7 Operation and MaintenanceOperation and Maintenance (OM) of the 3900 series multi-mode base stations coversmanagement, monitoring, and maintenance of the software, hardware, and configuration of thebase stations. In addition, diversified OM modes can meet the requirement of systemmaintenance in various scenarios.8 Surge Protection SpecificationsThis chapter describes the surge protection specifications for the ports on the BTS3900,BTS3900L, BTS3900A, BBU3900, MRFU, and RRU3908.9 ReliabilityThe 3900 series multi-mode base stations adopt a complete redundancy design, which greatlyenhances system reliability.

ConventionsSymbol ConventionsThe symbols that may be found in this document are defined as follows.

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Symbol DescriptionIndicates a hazard with a high level of risk, which if notavoided,will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, whichif not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if notavoided,could result in equipment damage, data loss,performance degradation, or unexpected results.Indicates a tip that may help you solve a problem or savetime.Provides additional information to emphasize or supplementimportant points of the main text.

General ConventionsThe general conventions that may be found in this document are defined as follows.

Convention DescriptionTimes New Roman Normal paragraphs are in Times New Roman.Boldface Names of files, directories, folders, and users are in

boldface. For example, log in as user root.Italic Book titles are in italics.Courier New Examples of information displayed on the screen are in

Courier New.

Command ConventionsThe command conventions that may be found in this document are defined as follows.

Convention DescriptionBoldface The keywords of a command line are in boldface.Italic Command arguments are in italics.[ ] Items (keywords or arguments) in brackets [ ] are optional.{ x | y | ... } Optional items are grouped in braces and separated by

vertical bars. One item is selected.[ x | y | ... ] Optional items are grouped in brackets and separated by

vertical bars. One item is selected or no item is selected.

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Convention Description{ x | y | ... }* Optional items are grouped in braces and separated by

vertical bars. A minimum of one item or a maximum of allitems can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated byvertical bars. Several items or no item can be selected.

GUI ConventionsThe GUI conventions that may be found in this document are defined as follows.

Convention DescriptionBoldface Buttons, menus, parameters, tabs, window, and dialog titles

are in boldface. For example, click OK.> Multi-level menus are in boldface and separated by the ">"

signs. For example, choose File > Create > Folder.

Keyboard OperationsThe keyboard operations that may be found in this document are defined as follows.

Format DescriptionKey Press the key. For example, press Enter and press Tab.Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt

+A means the three keys should be pressed concurrently.Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A means

the two keys should be pressed in turn.

Mouse OperationsThe mouse operations that may be found in this document are defined as follows.

Action DescriptionClick Select and release the primary mouse button without moving

the pointer.Double-click Press the primary mouse button twice continuously and

quickly without moving the pointer.Drag Press and hold the primary mouse button and move the

pointer to a certain position.

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Contents

About This Document...................................................................................................................iii1 Changes in the 3900 Series Multi-Mode Base Station Technical Description...............1-12 Overview......................................................................................................................................2-13 System Architecture...................................................................................................................3-14 Network Topologies..................................................................................................................4-1

4.1 Transport Network Topologies.......................................................................................................................4-24.2 CPRI Network Topologies..............................................................................................................................4-4

5 Transmission Schemes..............................................................................................................5-15.1 Independent Transmission...............................................................................................................................5-25.2 Co-Transmission.............................................................................................................................................5-2

5.2.1 Co-Transmission with TDM Timeslot Cross.........................................................................................5-25.2.2 Co-Transmission with IP........................................................................................................................5-3

6 Clock Schemes............................................................................................................................6-16.1 Independent Reference Clock Mode...............................................................................................................6-26.2 Common Reference Clock Mode....................................................................................................................6-4

7 Operation and Maintenance....................................................................................................7-17.1 OM Modes.......................................................................................................................................................7-27.2 OM Functions..................................................................................................................................................7-3

7.2.1 Common Parts........................................................................................................................................7-47.2.2 Configuration Management....................................................................................................................7-57.2.3 Alarm Management................................................................................................................................7-87.2.4 Software Upgrade...................................................................................................................................7-97.2.5 Commissioning Modes...........................................................................................................................7-97.2.6 Inventory Management........................................................................................................................7-10

7.3 Maintenance of Multi-Mode Base Stations...................................................................................................7-108 Surge Protection Specifications...............................................................................................8-19 Reliability....................................................................................................................................9-1

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Figures

Figure 3-1 System architecture of the 3900 series multi-mode base station in GU mode...................................3-1Figure 4-1 Star topology.......................................................................................................................................4-2Figure 4-2 Chain topology................................................................................................................................... 4-3Figure 4-3 Tree topology......................................................................................................................................4-3Figure 4-4 Chain topology................................................................................................................................... 4-4Figure 4-5 Ring topology.....................................................................................................................................4-5Figure 4-6 Star topology.......................................................................................................................................4-5Figure 4-7 Dual-star topology..............................................................................................................................4-6Figure 5-1 Independent transmission scheme in GU mode..................................................................................5-2Figure 5-2 Co-transmission with TDM timeslot cross (GTMU)......................................................................... 5-3Figure 5-3 Co-transmission with IP in GU mode (FE/GE)..................................................................................5-4Figure 5-4 Co-transmission with IP in GU mode (E1/T1)...................................................................................5-4Figure 5-5 Co-transmission with IP in GU mode (UTRP)...................................................................................5-4Figure 6-1 Independent E1/T1 reference clock in GU mode...............................................................................6-2Figure 6-2 Independent E1/T1 reference clock in GU mode with UMTS UTRP configured............................. 6-2Figure 6-3 Independent IP clock (independent transmission)..............................................................................6-3Figure 6-4 Independent IP clock (co-transmission with IP).................................................................................6-3Figure 6-5 Independent clock synchronized over Ethernet (UMTS)...................................................................6-4Figure 6-6 Common E1/T1 reference clock (GU)............................................................................................... 6-4Figure 6-7 Common E1/T1 reference clock (UMTS UTRP)...............................................................................6-5Figure 6-8 Common BITS reference clock..........................................................................................................6-5Figure 6-9 Common GPS reference clock (USCU).............................................................................................6-6Figure 7-1 OM system of the 3900 series multi-mode base stations................................................................... 7-3Figure 7-2 Common parts in the 3900 series multi-mode base station................................................................7-4Figure 7-3 Configuration management of the 3900 series multi-mode base station............................................7-6Figure 7-4 Initial configuration procedure of the 3900 series multi-mode base station...................................... 7-7Figure 7-5 Alarm management of the 3900 series multi-mode base station........................................................7-8

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Tables

Table 7-1 Maintenance operations performed at all modes................................................................................7-11Table 7-2 Maintenance operations that affect services of the other mode when they are performed at one mode.............................................................................................................................................................................7-12Table 8-1 Surge protection specifications for the ports on the BTS3900............................................................ 8-1Table 8-2 Surge protection specifications for the ports on the BTS3900L..........................................................8-1Table 8-3 Surge protection specifications for the ports on the BTS3900A..........................................................8-2Table 8-4 Surge protection specifications for the ports on the BBU3900............................................................8-2Table 8-5 Surge protection specifications for the ports on the MRFU/RRU3908...............................................8-2

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1 Changes in the 3900 Series Multi-Mode BaseStation Technical Description

This chapter describes the changes in the 3900 Series Multi-Mode Base Station TechnicalDescription.

03 (2010-10-25)This is the second commercial release.Compared with issue 02 (2010-9-15), this issue incorporates no new topics.Compared with issue 02 (2010-9-15), this issue incorporates the following changes:

Topic Change Description5.2.2 Co-Transmission with IP The figures are optimized.7.1 OM Modes The description of restrictions on using

network management systems is added.7.2.2 Configuration Management The description of restrictions on using

network management systems is added.

Compared with issue 02 (2010-9-15), this issue excludes no topics.

02 (2010-09-15)This is the first commercial release.Compared with issue 01 (2010-05-14), this issue incorporates the following new topics:l 7.3 Maintenance of Multi-Mode Base StationsCompared with issue 01 (2010-05-14), this issue incorporates the following changes:

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Topic Change Description5.2.2 Co-Transmission with IP The description is added that IP co-

transmission is implemented using UMTSUTRP when the MBTS works in GU mode.

7.2.1 Common Parts The description of loading control rights isadded.

7.2.2 Configuration Management The flowchart of the initial configurationprocedure is added.

7.2.3 Alarm Management The description of alarm management isoptimized.

Compared with issue 01 (2010-05-14), this issue excludes no topics.

01 (2010-05-14)This is the draft release.

1 Changes in the 3900 Series Multi-Mode Base StationTechnical Description

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2 OverviewThe 3900 series multi-mode base station launched by Huawei is a future-oriented product thatmeets customers' requirements for network evolution. The 3900 series multi-mode base stationuses Huawei's unified base station architecture comprising the BBU and RF modules. One suchbase station supports multiple RATs with the RF modules and boards of GSM, WCDMA,CDMA, WiMAX, and LTE installed in one cabinet. This enables the convergence of devices atthe base station, the sharing of site resources, and the unified OM. The 3900 series multi-modebase station is an ideal option for the evolution from the single-mode base station to the multi-mode base station.Huawei provides the multi-mode base stations in co-module mode and co-cabinet mode.l In the case of co-module mode, the 3900 series multi-mode base station supports multiple

RATs using one RF module. This is achieved through software configuration by using theSoftware-Defined Radio (SDR) technique.

l In the case of co-cabinet mode, RF modules and boards of different RATs are installed inone cabinet. In this manner, the cabinet supports multiple RATs. Note that the multi-modebase station in co-cabinet mode is not a new product but a solution. Such a base stationcabinet is a combination of independent physical devices that are logically related to eachother. The 3900 series multi-mode base station in co-cabinet mode can be furthercategorized into the following two types: Single-mode co-cabinet: Two or more single-mode components are placed in one

cabinet, each of which supports only one RAT. Hybrid co-cabinet: Single-mode components and multi-mode components are placed

in one cabinet. More RATs supported by each multi-mode module can be added throughsoftware upgrade.

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3 System ArchitectureThis chapter describes the system architecture of the 3900 series multi-mode base station.The main components of a 3900 series multi-mode base station mainly are the BBU3900 andRFU/RRU. The base station can work in GSM Only (GO), UMTS Only (UO), or GSM+UMTS(GU) mode. Figure 3-1 shows the system architecture of the 3900 series multi-mode base station.

Figure 3-1 System architecture of the 3900 series multi-mode base station in GU mode

The BBU3900 has a modular structure and consists of the control subsystem, transportsubsystem, baseband subsystem, and power module. When equipped with boards of differentRATs, the BBU3900 can serve any two RATs at the same time, thus enabling dual-modeapplication. In this manner, information exchange between two RATs is performed within theBBU3900 to complete clock signal transfer and data forwarding.The subsystems of the BBU3900 are described as follows:l Control subsystem: The functions of the control subsystem are implemented by the GTMU/

WMPT. The control subsystem manages the OM and signaling processing of the entirebase station system in a centralized manner. It also provides the system clock.

l Transport subsystem: The functions of the transport subsystem are implemented by theGTMU/WMPT/UTRP. The transport subsystem provides physical ports to connect to the

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base station controller, thus enabling information exchange between the BBU3900 and basestation controller. It also provides the OM channel that connects the MBTS to the OMC(LMT or M2000).

l Baseband subsystem: The functions of the baseband subsystem are implemented by theWBBP. The baseband subsystem performs baseband processing on the uplink anddownlink signals. In GSM, the baseband signal processing is performed by the radiofrequency (RF) module. The GTMU/UBRI provides CPRI ports connecting the RF module.

l Power module: The power module converts the -48 V DC or +24 V DC power to the usableDC power for boards in the base station and provides external monitoring ports.

The RFU/RRU is the RF module. A single-mode RF module performs modulation,demodulation, data processing, and combination and division of RF signals of only one RAT.The RF module of GSM also needs to process the GSM baseband signals. The MRFU/RRU3908can work in any two RATs through software configuration by using the SDR technique. Inaddition, the MRFU/RRU3908 and the single-mode RF module can be installed in the samecabinet to allow the applications of multiple RATs and multiple frequency bands.The antenna system consists of the RF antenna system and satellite antenna system. The 3900series multi-mode base station can use the Same band Antenna Sharing Unit (SASU) and Sameband Antenna Sharing Adapter (SASA) to share the antenna system for two radio communicationsystems operating on the same frequency band. This helps to reduce the CAPEX on networkdeployment.

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4 Network TopologiesAbout This Chapter

This chapter describes the transport network topologies and CPRI network topologies of the3900 series multi-mode base station.

4.1 Transport Network TopologiesThe 3900 series multi-mode base station supports multiple transport network topologies, suchas star, chain, and tree topologies.4.2 CPRI Network TopologiesThe 3900 series multi-mode base station supports multiple CPRI network topologies betweenthe BBU3900 and the RFU/RRU, such as chain, ring, star, and dual-star topologies.

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4.1 Transport Network TopologiesThe 3900 series multi-mode base station supports multiple transport network topologies, suchas star, chain, and tree topologies.

Star TopologyThe star topology is the most common topology and is applicable to densely populated areas.Figure 4-1 shows the star topology.

Figure 4-1 Star topology

l Advantages:

Each base station is directly connected to the controller. Therefore, this topology ischaracterized by easy engineering, maintenance, and capacity expansion. Each base station directly transmits data to and receives data from the controller. Signals

travel through only a few nodes, and therefore line reliability is high.l Drawbacks:

The star topology requires more transmission resources than other topologies.

Chain TopologyThe chain topology is applicable to belt-shaped and sparsely populated areas, such as areas alonghighways and railways.Figure 4-2 shows the chain topology.

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Figure 4-2 Chain topology

l Advantages:

This topology helps reduce the costs of transmission equipment, engineering, and leasedtransmission lines.

l Drawbacks: Signals travel through many nodes, and therefore line reliability is low. The faults in an upper-level base station may affect the lower-level base stations. The number of levels in a chain topology cannot exceed five.

NOTEIn a chain topology, if Abis bypass is enabled, the lower-level base stations can work properly even if there isa power failure in the upper-level base station.

Tree TopologyThe tree topology is applicable to areas with complicated network architecture, site distribution,and subscriber distribution, for example, hot spot areas in which subscribers are widelydistributed.Figure 4-3 shows the tree topology.

Figure 4-3 Tree topology

l Advantages:

The tree topology requires fewer transmission cables than the star topology.l Drawbacks:

Signals travel through many nodes, and therefore line reliability is low and engineeringand maintenance are difficult.



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The faults in an upper-level base station may affect the lower-level base stations. Capacity expansion is difficult because it may require changes in the network

architecture. The number of levels in a tree topology cannot exceed five.

4.2 CPRI Network TopologiesThe 3900 series multi-mode base station supports multiple CPRI network topologies betweenthe BBU3900 and the RFU/RRU, such as chain, ring, star, and dual-star topologies.

Chain TopologyThe chain topology is applicable to scenarios where the RF modules work in single mode. Figure4-4 shows the chain topology.

Figure 4-4 Chain topology

l Advantages:

The cost of transmission equipment is reduced.l Drawbacks:

The number of levels in a chain and the cascading distance are restricted. The RFUs/RRUs working in different RATs cannot be connected in cascade. The faults in an upper-level RFU/RRU may affect the lower-level RFUs/RRUs.

Ring TopologyThe ring topology is applicable to scenarios where the RF modules work in single mode. It is aredundancy backup mode of the chain topology. Figure 4-5 shows the ring topology.




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Figure 4-5 Ring topology

l Advantages:

The transmission reliability is guaranteed.l Drawbacks:

The number of levels in a chain and the cascading distance are restricted. The RFUs/RRUs working in different RATs cannot be connected in cascade. The faults in an upper-level RFU/RRU may affect the lower-level RFUs/RRUs.

Star TopologyThe star topology is applicable to short distance scenarios where multi-mode optical cables areused. Figure 4-6 shows the star topology.

Figure 4-6 Star topology

l Advantages:

The reliability is high. When the RFU/RRU or the optical cable channel is faulty, onlyone cell is affected.



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The installation and maintenance are easy.l Drawbacks:

This topology requires large number of optical cables, compared with other topologies.

Dual-Star TopologyThe dual-star topology is applicable to scenarios where the MRFU/RRU3908 works in twoRATs.In this topology, two RATs connect to the MRFU/RRU3908 through their individual CPRI portsimultaneously. Figure 4-7 shows the dual-star topology.

Figure 4-7 Dual-star topology

l Advantages:

The data of two RATs is transmitted over separate CPRI cables. In this manner, decouplingis achieved and the impact on each RAT is reduced.

l Drawbacks:The two CPRI ports on the MRFU/RRU3908 are used by two RATs separately, and thuscascading is impossible.




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5 Transmission SchemesAbout This Chapter

The 3900 series multi-mode base station supports two transmission schemes: independenttransmission and co-transmission.

5.1 Independent TransmissionWhen the 3900 series multi-mode base station works in independent transmission mode, anindependent transmission port is used by each RAT to connect to the transport network. In thismanner, the transport resources are not shared and thus no impact exists between the RATs interms of transport.5.2 Co-TransmissionWhen the 3900 series multi-mode base station works in co-transmission mode, a transmissionport is shared between RATs for connection to the transport network. In this manner, the transportresources are shared but the impact exists between the RATs in terms of transport. Co-transmission is classified into two types, co-transmission with TDM timeslot cross and co-transmission with IP.

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5.1 Independent TransmissionWhen the 3900 series multi-mode base station works in independent transmission mode, anindependent transmission port is used by each RAT to connect to the transport network. In thismanner, the transport resources are not shared and thus no impact exists between the RATs interms of transport.In independent transmission mode, the transmission decoupling, transmission scheme, andtransmission characteristics of each RAT within the multi-mode base station are the same as asingle-mode base station. Figure 5-1 shows the independent transmission schemes in GU mode.

Figure 5-1 Independent transmission scheme in GU mode

5.2 Co-TransmissionWhen the 3900 series multi-mode base station works in co-transmission mode, a transmissionport is shared between RATs for connection to the transport network. In this manner, the transportresources are shared but the impact exists between the RATs in terms of transport. Co-transmission is classified into two types, co-transmission with TDM timeslot cross and co-transmission with IP.

5.2.1 Co-Transmission with TDM Timeslot CrossIn scenarios where the 3900 series multi-mode base station works in GU mode, the TDM timeslotcross function can be used to multiplex the data of two RATs onto the transport network. In thismanner, the E1/T1 transmission resources are shared on the timeslot basis. With this transmissionmode, the TDM transmission bandwidth can be shared in a semi-static way.5.2.2 Co-Transmission with IPWhen the 3900 series multi-mode base station works in co-transmission with IP mode, thetechniques such as IP over Ethernet and IP over E1/T1 can be applied to share the physicaltransmission resources between two RATs and dynamically share the transmission bandwidth.

5.2.1 Co-Transmission with TDM Timeslot CrossIn scenarios where the 3900 series multi-mode base station works in GU mode, the TDM timeslotcross function can be used to multiplex the data of two RATs onto the transport network. In thismanner, the E1/T1 transmission resources are shared on the timeslot basis. With this transmissionmode, the TDM transmission bandwidth can be shared in a semi-static way.The co-transmission with TDM timeslot cross function is implemented by the GTMU, as shownin Figure 5-2.

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Figure 5-2 Co-transmission with TDM timeslot cross (GTMU)

The WMPT transmits the E1/T1 timeslots of UMTS to the GTMU through the TOP channel onthe backplane. The GTMU provides the E1/T1 ports that connect the base station to the transportnetwork. The GSM data and UMTS data are multiplexed onto the transport network through theTDM timeslot cross function, thus achieving E1/T1 transmission resource sharing on the timeslotbasis.

NOTEIn the preceding scenarios where the co-transmission with TDM timeslot cross function is applied, only thefollowing two clock schemes can be used:l (Recommended) The E1/T1 clock source is configured for the GSM BTS while the UMTS NodeB is

configured to share the GSM BTS clock.l When the BSC and RNC use the same E1/T1 clock source, the UMTS NodeB can be configured with the

E1/T1 clock source. In this case, the GSM BTS can be configured with other clock sources or be configuredto share the UMTS NodeB clock.

5.2.2 Co-Transmission with IPWhen the 3900 series multi-mode base station works in co-transmission with IP mode, thetechniques such as IP over Ethernet and IP over E1/T1 can be applied to share the physicaltransmission resources between two RATs and dynamically share the transmission bandwidth.Co-transmission with IP in the 3900 series multi-mode base station is implemented byinterconnecting the FE/GE ports on the board panel. That is, the FE/GE ports on the main controlboards of two RATs are interconnected, with one RAT sharing the physical transmission port.This transmission port enables the base station to be connected to the transport network.The FE/GE ports can be interconnected with either FE/GE electrical ports or FE/GE opticalports. The interconnected FE/GE ports must be the same type, either FE/GE electrical port orFE/GE optical port.In the case of the 3900 series multi-mode base station working in GU mode, interconnect theFE/GE ports on the GTMU and WMPT and connect the base station to the transport networkusing another FE/GE port or E1/T1 port on the WMPT, thus achieving co-transmission with IP.Figure 5-3 and Figure 5-4 show the typical scenarios.

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Figure 5-3 Co-transmission with IP in GU mode (FE/GE)

Figure 5-4 Co-transmission with IP in GU mode (E1/T1)

When UTRP2 is configured for UMTS, interconnect the FE/GE optical ports on the GTMU andUTRP2, and then use another FE/GE optical port on the UTRP2 to connect to the transportnetwork. Figure 5-5 shows the co-transmission with IP using UTRP.

Figure 5-5 Co-transmission with IP in GU mode (UTRP)

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6 Clock SchemesAbout This Chapter

The 3900 series multi-mode base station supports multiple external clock sources, including E1/T1 clock, BITS clock, GPS clock, IP clock, and clock synchronized over Ethernet. One RATcan use an external clock source independently or share the external clock source with anotherRAT. When external clock sources are unavailable, the base station continues to function for atleast 30 days in free running mode.

6.1 Independent Reference Clock ModeWhen the 3900 series multi-mode base station works in independent reference clock mode, eachRAT uses an external reference clock.6.2 Common Reference Clock ModeWhen the 3900 series multi-mode base station works in common reference clock mode, theRATs share the external reference clock. In this case, an external reference clock needs to beconfigured for one RAT, and then the other RAT needs to be configured to share the clock withthe RAT configured with the external reference clock.

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6.1 Independent Reference Clock ModeWhen the 3900 series multi-mode base station works in independent reference clock mode, eachRAT uses an external reference clock.

Independent E1/T1 Reference ClockWhen each RAT of the multi-mode base station connects to the transport network through itsown E1/T1 transmission link and clock signals are available on the transmission link, the RATcan extract clock signals from its own E1/T1 port. See Figure 6-1.

Figure 6-1 Independent E1/T1 reference clock in GU mode

When the UMTS is configured with the UTRP, the clock signals of UMTS can be obtained fromthe E1/T1 port on the UTRP. See Figure 6-2.

Figure 6-2 Independent E1/T1 reference clock in GU mode with UMTS UTRP configured

Independent IP ClockWhen each RAT of the multi-mode base station is connected to the transport network throughits own FE/GE transmission link or the co-transmission with IP mode is implemented throughFE interconnection, a client can be configured for each RAT. In this manner, the RAT can obtainits clock signals from the IP CLOCK server through the FE/GE transmission link.Figure 6-3 shows the working principle of the independent IP clock for the multi-mode basestation with independent FE/GE transmission link configured for each RAT.

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Figure 6-3 Independent IP clock (independent transmission)

Figure 6-4 shows the working principle of the independent IP clock for the multi-mode basestation when co-transmission with IP is implemented through FE ports interconnection.

Figure 6-4 Independent IP clock (co-transmission with IP)

NOTE

When the 3900 series multi-mode base station works in co-transmission with IP mode, the RAT not connectedto the transport network does not support multicast forwarding. Therefore, the RAT does not support the IPclock of multicast mode.

Independent Clock Synchronized over EthernetWhen the multi-mode base station in UMTS mode is connected to the transport network throughits own FE/GE transmission link and the transport network supports clock synchronization withEthernet, the base station can obtain the synchronized Ethernet clock signals from the transportnetwork through its own FE/GE transmission link.Figure 6-5 shows the working principle of the independent clock synchronized over Ethernet(UMTS).



6-3

Figure 6-5 Independent clock synchronized over Ethernet (UMTS)

6.2 Common Reference Clock ModeWhen the 3900 series multi-mode base station works in common reference clock mode, theRATs share the external reference clock. In this case, an external reference clock needs to beconfigured for one RAT, and then the other RAT needs to be configured to share the clock withthe RAT configured with the external reference clock.

Common E1/T1 Reference ClockWhen the multi-mode base station works in common E1/T1 reference clock mode, the clocksignals are obtained on the E1/T1 port of only one RAT and the other RAT is configured to sharethe clock.Figure 6-6 shows the working principle of the common E1/T1 reference clock for the multi-mode base station in GU mode with GSM clock signals being shared.

Figure 6-6 Common E1/T1 reference clock (GU)

When the UMTS is configured with the UTRP, the clock signals of UMTS can be obtained fromthe E1/T1 port on the UTRP and the other RAT is configured to share the clock. Figure 6-7shows the working principle of common E1/T1 reference clock for the multi-mode base stationin GU mode with UMTS UTRP configured.




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Figure 6-7 Common E1/T1 reference clock (UMTS UTRP)

Common BITS Reference ClockWhen the multi-mode base station is configured with the USCU and the BITS reference clockis used, the external 2.048 MHz BITS clock signals are routed to the base station over the BITSclock port. Each RAT uses the clock signals directly through the clock channels on the backplane.In this situation, only one RAT controls the USCU. The other RAT is configured to share theinternal clock signals exported from the USCU.Figure 6-8 shows the working principle of the common BITS reference clock for the multi-mode base station in GU mode.

Figure 6-8 Common BITS reference clock

Common GPS Reference ClockWhen the multi-mode base station is configured with the USCU and the GPS reference clock isused, each RAT directly uses the 1PPS GPS clock signals from the USCU over the clock bus.The absolute clock is read only by the main control board of the RAT controlling and managingthe USCU over the RS485 port and then sent to the main control board of another RAT throughbursts.Figure 6-9 shows the working principle of the common GPS reference clock for the multi-modebase station in GU mode.



6-5

Figure 6-9 Common GPS reference clock (USCU)




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7 Operation and MaintenanceAbout This Chapter

Operation and Maintenance (OM) of the 3900 series multi-mode base stations coversmanagement, monitoring, and maintenance of the software, hardware, and configuration of thebase stations. In addition, diversified OM modes can meet the requirement of systemmaintenance in various scenarios.

7.1 OM ModesThe OM platforms for the 3900 series multi-mode base stations are GBTS SMT, BSC LMT,NodeB LMT, and M2000. They provide local and remote OM for the base stations.7.2 OM FunctionsThe OM system of the 3900 series multi-mode base stations provides powerful OM functionsfor operators. The OM can be performed independently for each RAT of the base station orcentrally for a base station site.7.3 Maintenance of Multi-Mode Base StationsMaintain the 3900 series multi-mode base stations with caution because the maintenanceoperation performed at one mode may affect the services of other modes.

3900 Series Multi-Mode Base StationTechnical Description 7 Operation and Maintenance


7-1

7.1 OM ModesThe OM platforms for the 3900 series multi-mode base stations are GBTS SMT, BSC LMT,NodeB LMT, and M2000. They provide local and remote OM for the base stations.l GBTS SMT

The maintenance personnel use an Ethernet cable to connect the PC with the base stationand then use the GBTS SMT installed on the PC to maintain the 3900 series multi-modebase station in GSM mode.

l BSC LMTThe BSC LMT is used to maintain the 3900 series multi-mode base station in GSM mode.

l NodeB LMTThe NodeB LMT is used to maintain the 3900 series multi-mode base station in UMTSmode. To maintain a single NodeB, one can locally connect the LMT to the NodeB orremotely accesses the NodeB through an OM channel.

l M2000The M2000 is used to maintain multiple base stations in a centralized manner in terms of,for example, data configuration (CME), alarm monitoring, performance monitoring, andsoftware upgrade.All the descriptions in this document assume that only one network management systemis used to manage the MBTS. If more than one network management system is used, thehandling procedures for the MBTS operation and maintenance, including alarmmanagement, software management, inventory management, topology management, NEhealth check, commissioning, software upgrade, and data configuration, provided in thisdocument do not apply.

Figure 7-1 shows the OM system of the 3900 series multi-mode base stations.

7 Operation and Maintenance3900 Series Multi-Mode Base Station



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Figure 7-1 OM system of the 3900 series multi-mode base stations

7.2 OM FunctionsThe OM system of the 3900 series multi-mode base stations provides powerful OM functionsfor operators. The OM can be performed independently for each RAT of the base station orcentrally for a base station site.

7.2.1 Common PartsThe parts managed commonly by each mode of the 3900 multi-mode base station are calledcommon parts. The parameters related to the common parts are called common parameters.7.2.2 Configuration ManagementThe configuration management of the 3900 series multi-mode base station consists of initialconfiguration and reconfiguration. In the initial network deployment phase, the basic MBTSdata can be configured on the CME to enable unified network deployment. After the base stationstarts operating, the CME or MML commands can be used for MBTS reconfiguration, such asadding, deleting, or modifying the data.7.2.3 Alarm Management



7-3

The alarms of the 3900 series multi-mode base station include the alarms of each mode and thecommon alarms. The alarms of each mode are managed individually and the common alarmsare managed jointly.7.2.4 Software UpgradeThe 3900 series multi-mode base stations can be upgraded with multiple tools. The two RATsof the base station can be upgraded individually or collectively as one site.7.2.5 Commissioning ModesThe 3900 series multi-mode base stations7.2.6 Inventory ManagementThe inventory information of the 3900 series multi-mode base stations can be centrally andeffectively managed through the M2000.

7.2.1 Common PartsThe parts managed commonly by each mode of the 3900 multi-mode base station are calledcommon parts. The parameters related to the common parts are called common parameters.

Common PartsThe common parts in the MBTS consist of the environment monitoring device, fan unit, powermodule, USCU, and RF module working in dual mode. See Figure 7-2.

Figure 7-2 Common parts in the 3900 series multi-mode base station

NOTE

Mode A and Mode B represent two modes of an MBTS.

Common ParametersThe common parameters must be configured consistently for different modes of the MBTS.Otherwise, parameter configuration conflict alarms will be generated. For details about thecommon parameters, see the 3900 Series Multi-Mode Base Station Common ParameterChecklist. This table describes the mapping of the common parameters between the modes andthe MML commands used for querying and modifying the parameters.

Loading Control RightsIn the MBTS, the software version of a common part may be different from the software packageof one mode to another. Therefore, when a common part is set on each side of the modes to work




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in common mode, software management is performed on the basis of the loading control rightsset by the user. This is used to determine that the software version of the software package ofone mode and the software version of the common part are consistent. For example, if the loadingcontrol rights are set on the UMTS side, then the software of the common parts is loaded on theUMTS side during the upgrade.The loading control rights are applicable to the following scenarios:l The loading control rights need to be specified and take effect immediately after the MBTS

starts operating.l The original loading control rights need to be changed during MBTS upgrade.l The loading control rights need to be predetermined before a single-mode is evolved into

the MBTS.l The loading control rights need to be specified again when loading control rights conflict

arises on the MBTS.When setting the loading control rights, one needs to specify the local software version numberand peer software version number and determine the mode that is responsible for loading thesoftware for the common parts under a specific software version combination. For example,when setting the loading control rights on the GBTS side in GU mode, one needs to specify thesoftware version number of the GBTS (local) and that of the NodeB (peer) and determine themode that is responsible for loading the software for the common parts under this softwareversion combination.Two loading control rights records can be set up. One record is used to specify the loading controlrights of the currently running version and the other is used to specify the loading control rightsafter the software upgrade. For a software version combination, the base station saves only oneloading control rights record. If the software version of the newly set loading control rights isthe same as that of the loading control rights record saved on the base station, the old loadingcontrol rights record is overwritten.The loading control rights can take effect immediately or take effect later. If the loading controlrights are set to take effect immediately, the mode having the loading control rights updates thesoftware of the common parts immediately after the loading control rights are set to ensure thatthe software of the common parts is consistent with the software version of the mode. If theloading control rights are set to take effect later, the software of the common parts is not updatedimmediately until software upgrade is performed or version check is performed on the commonparts.No mode of the MBTS performs software loading on the common parts if any of the followingconfiguration conflicts arise:l The subrack and slot configurations of a physically identical common part are inconsistent

from one mode to another.l The subrack and slot configurations of a common part are consistent with its physical

position but the work mode is configured inconsistently between the modes.

7.2.2 Configuration ManagementThe configuration management of the 3900 series multi-mode base station consists of initialconfiguration and reconfiguration. In the initial network deployment phase, the basic MBTSdata can be configured on the CME to enable unified network deployment. After the base stationstarts operating, the CME or MML commands can be used for MBTS reconfiguration, such asadding, deleting, or modifying the data.



7-5

Figure 7-3 shows the configuration management of the 3900 series multi-mode base station.

Figure 7-3 Configuration management of the 3900 series multi-mode base station

If more than one network management system manages the MBTS, monitoring boards must beconfigured and managed on only one side.

Initial ConfigurationIn the initial deployment phase, the CME can be used to configure the basic data for the basestation after the base station hardware is installed and the base station successfully gets accessto the M2000. Once the initial configuration is complete, the base station starts to function andprocess basic services.Figure 7-4 shows the initial configuration process of the 3900 series multi-mode base station.For detailed operations, see the MBTS Initial Configuration Guide.




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Figure 7-4 Initial configuration procedure of the 3900 series multi-mode base station

CME provides the function of checking data consistency to ensure that the data is configured incompliance with the configuration principles.l The specific data of each mode is verified on the basis of the check rules of each NE to

ensure the correctness of the configuration data.l The common data is verified on the CME based on the MBTS primary mode and the check

rules for the common device data. If parameter configurations of the common devices arefound to be inconsistent between two modes, the CME modifies the data automaticallybased on the setting of the MBTS primary mode.

ReconfigurationReconfiguration involves addition, removal, or modification of various base station data afterthe base station starts operating.Reconfiguration is applicable to the following scenarios:l Network optimization: Based on the system operation data obtained during the network

operation by means of performance measurement and drive test, the network performancecan be tuned and optimized accordingly.

l System capacity expansion: By adding hardware to or changing configurations of theexisting network, the system can provide services for more users.



7-7

l Feature configuration: This task involves configuring key parameters to activate theoptional features.

One can use the CME or the MML commands on the LMT to perform MBTS reconfiguration.It is recommended that the CME be used. During reconfiguration, it is recommended that onemanually check configuration data consistency to avoid the conflict of the parameterconfigurations of the common devices between the modes.

7.2.3 Alarm ManagementThe alarms of the 3900 series multi-mode base station include the alarms of each mode and thecommon alarms. The alarms of each mode are managed individually and the common alarmsare managed jointly.Figure 7-5 shows the alarm management of the MBTS.

Figure 7-5 Alarm management of the 3900 series multi-mode base station

l Managing alarms on the SMT and LMT:The MBTS is managed as multiple independent NEs, and the alarm information of eachmode consists of the specific alarms and the common alarms. GBTS alarms can be managed on the GBTS SMT and BSC LMT. The GBTS SMT is

used only for querying alarms and setting some mechanical and electrical alarms. TheBSC LMT can be used to manage all GBTS alarms. NodeB alarms can be managed on the NodeB LMT.In the case that the MBTS is managed as multiple independent NEs, the change of data inone mode will simultaneously affect the data in another mode. For example, when acommon alarm is cleared on the GBTS side, the same common alarm will be cleared onthe NodeB side.

l Managing alarms on the M2000:The MBTS is managed as multiple independent NEs or as one device.




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When the MBTS is managed as multiple independent NEs, the alarms include the alarmsof each mode and the common alarms. In this scenario, the M2000 manages the alarmsof the MBTS as it manages those of a single-mode base station and the operationsperformed on the M2000 take effect only for a specific mode. When the data in onemode changes, the corresponding data in another mode will also change. The M2000provides the function of filtering the common alarms. That is, the common alarms canbe displayed only in one mode by setting the filtering conditions. This prevents thealarms from being reported repeatedly. When the MBTS is managed as one device, only one alarm window of the MBTS is

displayed. The alarm window includes two parts, one containing the alarms of eachmode and the other containing the common alarms. This helps the maintenancepersonnel know the alarms of the device as a whole and facilitate troubleshooting. Here,the common alarms are managed by the mode with high priority.

If common parameter settings are inconsistent between two modes, parameter setting conflictalarms will arise. In this case, the inter-mode parameter setting conflict alarms need to be clearedfirst. After such alarms are cleared, check whether other configuration conflict alarms exit. Ifthe base station still reports configuration conflict alarms, clear the alarms by referring to the3900 Series Multi-Mode Base Station Alarm Reference.

7.2.4 Software UpgradeThe 3900 series multi-mode base stations can be upgraded with multiple tools. The two RATsof the base station can be upgraded individually or collectively as one site.The 3900 series multi-mode base stations support two upgrade scenarios, local upgrade andremote upgrade.l During local upgrade, the SMT or LMT is used for separate software upgrade of GSM or

UMTS. In this case, the loading control rights need to be set through the SMT/LMT todetermine which RAT has the rights to load the software for common parts. When one RATobtains the loading control rights, the software and hot patch versions of the common boardsmust be consistent with those of the main control board of the RAT.

l During remote upgrade, the M2000 is used to upgrade one RAT of the base station or twoRATs simultaneously as one site. In this case, the M2000 automatically loads the controlrights from the file VERMATCH.XML in the upgrade software package to determinewhich RAT has the rights to load the software for common parts. In the case of GSM, thesoftware upgrade can be performed on the BSC LMT.

7.2.5 Commissioning ModesThe 3900 series multi-mode base stationsA series of commissioning and preliminary verification are needed after the hardware installationof a base station is completed to ensure that the base station functions as designed. In the caseof the multi-mode base station, the commissioning for each RAT is performed separately, whilethat for common parts is done collectively between the RATs.The multi-mode base station supports the following commissioning modes:l Remote commissioning combined with local USB

In this mode, the USB disk is used locally to upgrade the base station software and downloaddata configuration files (for GSM, the USB disk cannot be used to download dataconfiguration files and the data configuration can be done only on the BSC LMT). Then,the BSC LMT and M2000 are used remotely to commission the parts working in GSM and



7-9

UMTS modes. In this mode, the control rights for the base station cannot be obtainedthrough the USB disk. Therefore, the RFU/RRU working in dual-mode state cannot beupgraded. Instead, the RFU/RRU is upgraded automatically after the base station isfunctioning and upgraded successfully.

l Local commissioningIn local commissioning mode, the GBTS SMT, and NodeB LMT are used for softwareupgrade, data configuration, and status query of the parts working in GSM and UMTSmodes. Besides, further commissioning for the parts working in GSM mode must beperformed on the BSC LMT to ensure the normal operation of the base station. In this mode,the control rights for the base station need to be obtained through the LMT to ensure thatthe RFU/RRU working in dual-mode state is upgraded with one RAT.

l Remote commissioningIn remote commissioning mode, the BSC LMT and M2000 are used for software upgrade,data configuration, and status query of the parts working in GSM and UMTS modes.

7.2.6 Inventory ManagementThe inventory information of the 3900 series multi-mode base stations can be centrally andeffectively managed through the M2000.Inventory management involves the logical inventory management (configuration informationmanagement) and physical inventory management (asset management).l The logical inventory management manages the local inventory objects, including cells and

versions.l The physical inventory management manages the physical inventory objects, including

racks, subracks, slots, boards, ports, antennas, and optical modules.The inventory management of the multi-mode base station is performed separately for each RAT,and the inventory information of one RAT does not contain the inventory information of anotherRAT. But each RAT provides the inventory management functions for the common parts. Whengranted with a specific license for the multi-mode base station, an operator can query,synchronize, modify, import, and export the configuration information and asset information ofthe base station through the M2000. This enables the operator to know the configurationinformation and asset information of the devices from the entire network perspective. To avoidrepeated management of the common parts, the operator can distinguish the duplicate boards bychecking their electronic labels. In this manner, redundant inventory information can be deleted.

7.3 Maintenance of Multi-Mode Base StationsMaintain the 3900 series multi-mode base stations with caution because the maintenanceoperation performed at one mode may affect the services of other modes.Some maintenance operations for a multi-mode base station must be performed at all modes, asshown in Table 7-1.




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Table 7-1 Maintenance operations performed at all modesMaintenanceOperation

GSM UMTS Remarks

BlockingRFmodules/Carriers

l MML: SETGTRXADMSTAT

l SMT: See section"Managing RCs >Changing the RCManagement State"in the SMT UserGuide or DBS3900GSM SiteMaintenanceTerminal User Guide.

l LMT: See section"BTS Maintenance >ModifyingAdministrativeState" in theBSC6900 GU LMTUser Guide.

l MML: BLKBRD

l LMT: Seesection"ManagingNodeBEquipment >NodeB Board-LevelOperations >Blocking/Unblocking aNodeB Board"in the NodeBLMT UserGuide.

l To block an RF modulethat carries the servicesof two modes, block theRF module at bothmodes.

l In the case of the UMTSmode, block RFmodules. In the case ofthe GSM mode, blockcarriers of RF modulesbecause RF modulescannot be blocked.

Blockingcells

l MML: SETGCELLADMSTAT

l SMT: See section"Managing Cells >Changing the CellManagement State"in the SMT UserGuide or DBS3900GSM SiteMaintenanceTerminal User Guide.

l LMT: See section"BTS Maintenance >ModifyingAdministrativeState" in theBSC6900 GU LMTUser Guide.

TIPBefore blocking a cell, youcan run the MMLcommand LST GCELL toquery the configurationinformation about the cellsunder the base station.

MML: BLKLOCELL

A dual-mode RF moduledoes not transmit poweronly after the cells areblocked at both modes.



7-11

When some maintenance operations are performed at one mode, the services of the other modeare affected, as shown in Table 7-2.

Table 7-2 Maintenance operations that affect services of the other mode when they areperformed at one mode

MaintenanceOperation

GSM UMTS Impact

Settingloadingcontrolrights

MML: SETBTSLOADCTRL

MML: SETLOADCTRL

l The software of thecommon parts (such asdual-mode RF modules)is loaded and upgraded atthe mode that has theloading control rights.

l If both modes have theloading control rightsand the software versionsset at the two modes arethe same, an alarmindicating that theloading control rightconflict is reported.

l When the multi-modebase station works in co-module mode, and thesoftware version of RFmodules needs to beupgraded, services of theother mode are disrupted,if you set EffectImmediately Flag to Yes.




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GSM UMTS Impact

Activatingthe basestationsoftware

l MML: ACT BTSSWl SMT: See section

"Managing Sites >ActivatingSoftware" in the SMTUser Guide orDBS3900 GSM SiteMaintenanceTerminal UserGuide.

l LMT: See section"BTS Maintenance> Activating BTSSoftware" in theBSC6900 GU LMTUser Guide.

MML: ACTSOFTWARE

When running thiscommand to activate thebase station software, payattention to the following:l When the multi-mode

base station works in co-module mode, and theloading control rights areat one mode, services ofthe other mode will bedisrupted, if thiscommand is executed toactivate an RF moduleworking in co-modulemode.

l When the multi-modebase station adopts co-transmission and onemode shares its portswith the other mode,services of the othermode will be disrupted, ifthis command isexecuted to activate theboard whose ports areshared between bothmodes.

Rollingback thebasestationsoftware

None MML: RBKSOFTWARE

Rolling back the base stationsoftware at one modedisrupts the services of theother mode in the followingscenarios:l The multi-mode base

station works in co-module mode, and theloading control rights areat one mode.

l The multi-mode basestation adopts co-transmission and onemode shares its portswith the other mode.



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GSM UMTS Impact

Resettingthe basestation

l MML: RST BTSl SMT: See section

"Managing Sites >Resetting a SiteHierarchically" inthe SMT User Guideor DBS3900 GSMSite MaintenanceTerminal UserGuide.

l LMT: See section"BTS Maintenance> Resetting the BTSby Levels" in theBSC6900 GU LMTUser Guide.

MML: RSTNODEB

l When the multi-modebase station works in co-module mode, runningthis command disruptsservices of the othermode.

l When the multi-modebase station adopts co-transmission and onemode shares its portswith the other mode,running this commanddisrupts services of theother mode.

l When level-3 or level-4reset is performed on theGSM side, services of theother mode carried on theRF module that works inco-module mode aredisrupted.




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GSM UMTS Impact

Resettingboards

l MML: RSTBTSBRD

l SMT: Resetting the

boards in theBBU: See section"BBUOperations >Resetting aboard" in theSMT User Guideor DBS3900 GSMSite MaintenanceTerminal UserGuide. Resetting the RF

module: Seesection "RFUOperations" orsection "RRUOperations >Resetting aBoard" in theSMT User Guideor DBS3900 GSMSite MaintenanceTerminal UserGuide.

l LMT: See section"BTS Maintenance> MaintainingTRXs > Resettingthe TRX" in theBSC6900 GU LMTUser Guide.

l MML: RSTBRD

l LMT: Seesection"ManagingNodeBEquipment >NodeB Board-LevelOperations >Resetting aNodeB Board"in the NodeBLMT UserGuide.

When running thiscommand to reset a board,pay attention to thefollowing:l When the multi-mode

base station works in co-module mode, servicesof the other mode aredisrupted, if thiscommand is executed toreset the RF module thatworks in co-modulemode.

l When the multi-modebase station adopts co-transmission and onemode shares its portswith the other mode,services of the othermode will be disrupted, ifthis command isexecuted to reset theboard where ports sharedby both modes arelocated.



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GSM UMTS Impact

Resettingboards inpower-offmode

SMT:l Resetting the boards

in the BBU in power-off mode: See section"BBU Operations >Resetting a Board inPower-Off Mode" inthe SMT User Guideor DBS3900 GSMSite MaintenanceTerminal UserGuide.

l Resetting RFmodules in power-offmode: See section"RFU Operations"or section "RRUOperations >Resetting a Board inPower-Off Mode" inthe SMT User Guideor DBS3900 GSMSite MaintenanceTerminal UserGuide.

MML: RSTBRDPWROFF

When running thiscommand to reset a board inpower-off mode, payattention to the following:l When the multi-mode

base station works in co-module mode, servicesof the other mode aredisrupted, if thiscommand is executed toreset in power-off modethe RF module thatworks in co-modulemode.

l When the multi-modebase station adopts co-transmission and onemode shares its portswith the other mode,services of the othermode will be disrupted, ifthis command isexecuted to reset inpower-off mode theboard where ports sharedby both modes arelocated.

Startingthe VSWRdetection

MML: STRBTSVSWRTEST

MML: STRVSWRTEST

The services of the othermode are disrupted if theVSWR test is performed oneither of the followingboards:l RF modules that work in

co-module model RF modules that work in

different modes but sharethe same antenna system




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GSM UMTS Impact

Startingthetransmissionperformance test

l SMT: See section"Managing Sites >TestingTransmissionPerformance" in theSMT User Guide orDBS3900 GSM SiteMaintenanceTerminal UserGuide.

l LMT: See section"BTS Maintenance> Maintaining Site >TestingTransmissionPerformance" in theBSC6900 GU LMTUser Guide.

None When the multi-mode basestation adopts co-transmission and one modeshares its ports with the othermode, performing atransmission performancetest disrupts services of theother mode.

Activatingtheconfiguration baseline(CB)

None MML: ACT CB The CB activation at onemode disrupts the services ofthe other mode in thefollowing scenarios:l The multi-mode base

station works in co-module mode.

l The multi-mode basestation adopts co-transmission and UMTSshares its ports with theother mode.

Rollingback theCB

None MML: RBK CB The CB rollback at one modedisrupts the services of theother mode in the followingscenarios:l The multi-mode base

station works in co-module mode.

l The multi-mode basestation adopts co-transmission and UMTSshares its ports with theother mode.



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GSM UMTS Impact

Startingthehardwaretest

None MML: STRHWTST

When running thiscommand to start a hardwaretest, pay attention to thefollowing:l When the multi-mode

base station works in co-module mode, servicesof the other mode aredisrupted, if thiscommand is executed tostart a hardware test onthe RF module thatworks in co-modulemode.

l When the multi-modebase station adopts co-transmission and UMTSshares its ports with theother mode, services ofthe other mode will bedisrupted, if thiscommand is executed tostart a hardware test onthe board where portsshared by both modes arelocated.




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8 Surge Protection SpecificationsThis chapter describes the surge protection specifications for the ports on the BTS3900,BTS3900L, BTS3900A, BBU3900, MRFU, and RRU3908.

NOTE

l Unless otherwise specified, the surge protection specifications depend on the surge waveform of 8/20 s.l All the discharge current items, unless otherwise specified as maximum discharge current, refer to

nominal discharge current.

Surge Protection Specifications for the Ports on the BTS3900Table 8-1 describes the surge protection specifications for the ports on the BTS3900.

Table 8-1 Surge protection specifications for the ports on the BTS3900Port Surge Protection Mode SpecificationDC power supply port Differential mode 10 kA

Common mode 15 kAAC power supply port Differential mode 60 kA

Common mode 60 kA

Surge Protection Specifications for the Ports on the BTS3900LTable 8-2 describes the surge protection specifications for the ports on the BTS3900L.

Table 8-2 Surge protection specifications for the ports on the BTS3900LPort Surge Protection Mode SpecificationDC power supply port Differential mode 10 kA

Common mode 15 kA

3900 Series Multi-Mode Base StationTechnical Description 8 Surge Protection Specifications


8-1

Surge Protection Specifications for the Ports on the BTS3900ATable 8-3 describes the surge protection specifications for the ports on the BTS3900A.

Table 8-3 Surge protection specifications for the ports on the BTS3900APort Surge Protection Mode SpecificationDC power supply port Differential mode 10 kA

Common mode 15 kAAC power supply port Differential mode 60 kA

Common mode 60 kA

Surge Protection Specifications for the Ports on the BBU3900Table 8-4 describes the surge protection specifications for the ports on the BBU3900.

Table 8-4 Surge protection specifications for the ports on the BBU3900Port Surge Protection Mode SpecificationPower supply socket Differential mode 1 kA

Common mode 2 kAExternal alarm port andmonitoring port

Differential mode 250 kACommon mode 250 kA

Surge Protection Specifications for the Ports on the MRFU/RRU3908Table 8-5 describes the surge protection specifications for the ports on the MRFU/RRU3908.

Table 8-5 Surge protection specifications for the ports on the MRFU/RRU3908Port Surge Protection Mode SpecificationPower supply socket Differential mode 10 kA

Common mode 20 kAAntenna port Differential mode 8 kA

Common mode 40 kARET antenna port Differential mode 3 kA

Common mode 5 kA

8 Surge Protection Specifications3900 Series Multi-Mode Base Station



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9 ReliabilityThe 3900 series multi-mode base stations adopt a complete redundancy design, which greatlyenhances system reliability.

Hardware Reliabilityl Hardware reliability of the BBU3900

The BBU3900 is equipped with built-in fans and supports redundancy configurations.With the intelligent temperature control technology, the BBU3900 can automaticallyadjust the fan speed and maintain the proper working condition of the heat dissipationsystem of the BBU. In this way, the noise from the fans reduces, the fan attrition rateslows down, and the reliability and durability of the heat dissipation system is enhanced.In addition, the BBU3900 can control the start/shutdown of the fans and report fan-related alarms. When one of the fans in the BBU3900 is faulty, the base station continues to work even

if the system temperature specification is lowered by 10C. The power module is overcurrent-protected. The BBU3900 supports overtemperature protection. When the temperature in the BBU

is high, the BBU automatically reduces the power and/or shuts down the poweramplifier, depending on the temperature. When the temperature becomes normal, theBBU cancels the overtemperature protection. The optical module is hot-swappable, thus simplifying maintenance. The BBU3900 provides the ports that receive the alarms related to the environment. The power input port on the BBU3900 is capable of preventing misconnection and

reverse connection.l Hardware reliability of the RRU3908

Reliability design for input power: In the case of the DC power input, the permissiblevoltage range of the RRU3908 is from -36 V DC to -57 V DC. The RRU3908 isoperational even when the peak input voltage reaches -60 V DC, thus preventingdamages caused by unstable power input. Overtemperature protection: When the temperature in the RRU is too high due to

ambient factors, the RRU automatically enables overtemperature protection. When thetemperature becomes normal, the RRU automatically disables the overtemperatureprotection.

l Hardware reliability of the MRFU

3900 Series Multi-Mode Base StationTechnical Description 9 Reliability


9-1

Reliability design for input power: In the case of the DC power input, the permissiblevoltage range of the MRFU is from -36 V DC to -57 V DC. The MRFU is operationaleven when the peak input voltage reaches -60 V DC, thus preventing damages causedby unstable power input. Overtemperature protection: When the temperature in the MRFU is too high due to

ambient factors, the MRFU automatically enables overtemperature protection. Whenthe temperature becomes normal, the MRFU automatically disables theovertemperature protection.

Software ReliabilityThe software reliability is considered as the error tolerance capability. When a software faultoccurs, the self-healing ability protects the base station from breakdown. The error tolerance ofthe BBU3900 and RRU3908/MRFU software covers the following aspects:l Scheduled check of key resources

The base station checks software resource usage regularly. If resource deadlock occursbecause of software faults, the system can release the unavailable resources in time andexport logs and alarms.

l Parameter checkValidity check is performed on all the parameters of commands on the LMT and OMC.The data in the configuration files is also checked upon the system startup to ensure stablerunning of the system. During software running, the monitoring process monitors the taskrunning status. If internal software errors and hardware faults are detected, the monitoringprocess reports alarms, and meanwhile attempts to restore the task by self-healing.

l Protection against software faultsTwo software versions and two data versions are stored in the base station. If softwareupgrade fails, the system automatically rolls the version back to the pre-upgrade one, thuslowering the probability of onsite troubleshooting in the case of software download failures.

l Data checkThe base station performs scheduled or event-triggered data consistency check and restoresthe data consistency selectively or preferentially. In addition, the base station generatesrelated logs and alarms.

l Storage of operation logsThe base station records the operations performed during a period and stores the recordsin the operation logs. When the system incurs an unknown error, the maintenance personnelcan identify the problem by tracing back to the normal status or can perform data restoration.

l BackupThe base station supports backup of transmission links.

9 Reliability3900 Series Multi-Mode Base Station



Issue 03 (2010-10-25)

About This DocumentContentsFiguresTables1 Changes in the 3900 Series Multi-Mode Base Station Technical Description2 Overview3 System Architecture4 Network Topologies4.1 Transport Network Topologies4.2 CPRI Network Topologies

5 Transmission Schemes5.1 Independent Transmission5.2 Co-Transmission5.2.1 Co-Transmission with TDM Timeslot Cross5.2.2 Co-Transmission with IP

6 Clock Schemes6.1 Independent Reference Clock Mode6.2 Common Reference Clock Mode

7 Operation and Maintenance7.1 OM Modes7.2 OM Functions7.2.1 Common Parts7.2.2 Configuration Management7.2.3 Alarm Management7.2.4 Software Upgrade7.2.5 Commissioning Modes7.2.6 Inventory Management

7.3 Maintenance of Multi-Mode Base Stations

8 Surge Protection Specifications9 Reliability

Documents

3900 Series Multi-Mode Base Station Technical Description (V100R002_03)