bbu interconnection(sran9.0_draft a)

SingleRAN

BBU Interconnection FeatureParameter Description

Issue Draft A

Date 2014-01-20

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2014. 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 a 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.com

Email: [email protected]

Issue Draft A (2014-01-20) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

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http://www.huawei.com

mailto:[email protected]

Contents

1 About This Document..................................................................................................................11.1 Scope..............................................................................................................................................................................11.2 Intended Audience..........................................................................................................................................................11.3 Change History...............................................................................................................................................................1

2 Overview.........................................................................................................................................32.1 Introduction....................................................................................................................................................................42.2 Upgrade to Triple-Mode Base Stations..........................................................................................................................42.2.1 BBU Slots....................................................................................................................................................................42.2.2 Cable Connections.......................................................................................................................................................42.2.3 Application Scenarios..................................................................................................................................................52.2.4 Restrictions..................................................................................................................................................................62.2.5 Supported Features and Functions...............................................................................................................................62.3 UMTS Baseband Capacity Expansion...........................................................................................................................72.3.1 Cable Connections.......................................................................................................................................................72.3.2 Application Scenarios..................................................................................................................................................82.3.3 Restrictions..................................................................................................................................................................9

3 Related Features...........................................................................................................................11

4 Impact on the Network...............................................................................................................124.1 Impact on System Capacity..........................................................................................................................................124.2 Impact on Network Performance..................................................................................................................................12

5 Engineering Guidelines.............................................................................................................135.1 When to Use BBU Interconnection..............................................................................................................................135.2 Information to Be Collected.........................................................................................................................................135.3 Network Planning.........................................................................................................................................................135.3.1 Software Versions......................................................................................................................................................135.3.2 Subracks and Hardware Configurations for the BBUs..............................................................................................145.3.3 Transmission Modes..................................................................................................................................................145.3.4 CPRI-based Topologies.............................................................................................................................................175.3.5 Clocks........................................................................................................................................................................215.4 Feature Deployment.....................................................................................................................................................215.4.1 Deployment Requirements........................................................................................................................................21

SingleRANBBU Interconnection Feature Parameter Description Contents


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5.4.2 Data Preparation........................................................................................................................................................215.4.3 Initial Configuration..................................................................................................................................................245.4.4 Activation Observation..............................................................................................................................................255.5 Adjustment Examples...................................................................................................................................................265.5.1 Adjustment from a GU Dual-Mode Base Station to a GU+L Triple-Mode Base Station.........................................265.5.2 UMTS Baseband Capacity Expansion from a GU+L to a GU+UL Triple-Mode Base Station................................305.6 Performance Optimization............................................................................................................................................375.7 Troubleshooting............................................................................................................................................................37

6 Parameters.....................................................................................................................................39

7 Counters........................................................................................................................................46

8 Reference Documents.................................................................................................................47

SingleRANBBU Interconnection Feature Parameter Description Contents


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1 About This Document

1.1 ScopeThis document describes the BBU Interconnection feature, including its implementationprinciples, network impact, and engineering guidelines.

This document is applicable to the following base stations:

l BTS3900(Ver.B), BTS3900(Ver.C) and BTS3900(Ver.D)

l BTS3900L(Ver.B), BTS3900L(Ver.C) and BTS3900L(Ver.D)

l BTS3900A(Ver.B), BTS3900A(Ver.C), BTS3900A(Ver.D), BTS3900A(Ver.D_A1) andBTS3900A(Ver.D_A2)

l BTS3900AL(Ver.A)

l DBS3900

l BTS3900C and BTS3900C(Ver.C)

l BTS3012(Ver.D_Z)

l BTS3012AE(Ver.D_Z)

Any managed objects (MOs), parameters, alarms, or counters described in this documentcorrespond to the software release delivered with this document. In the event of updates, theupdates will be described in the product documentation delivered with the latest software release.

1.2 Intended AudienceThis document is intended for personnel who:

l Personnel who need to understand the features herein.

l Personnel who work with Huawei products.

1.3 Change HistoryThis section provides information about the changes in different document versions.

SingleRANBBU Interconnection Feature Parameter Description 1 About This Document


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There are two types of changes, which are defined as follows:

l Feature changeChanges in features of a specific product version.

l Editorial changeChanges in wording or the addition of information that was not described in the earlierversion.

Draft A (2014-01-20 )Compared with Issue 02 (2013-07-30) of SingleRAN8.0, Draft A (2014-01-20) ofSingleRAN9.0 includes the following changes.

Change Type Change Description Parameter Change

Feature change l Added the infrastructureinterconnection methods forconnecting a BBU3900 and aBBU3910 and for connecting twoBBU3910s to section "2.2 Upgrade toTriple-Mode Base Stations".

l Added the baseband interconnectionmethod for connecting the UBBPdboards in two BBUs to section"UMTS Baseband CapacityExpansion".

None

Editorial change None None

SingleRANBBU Interconnection Feature Parameter Description 1 About This Document


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2 Overview

In BBU Interconnection, two BBUs are connected using a BBU interconnection signal cable.The BBU Interconnection feature applies to the following scenarios:

l Triple-mode base station deploymentWith BBU Interconnection, a base station can be deployed in the following modes: GU+L,GL+U, or G*U*L+G*U*L. Two interconnected BBUs belong to the same base station.

l UMTS baseband capacity expansionA single BBU supports a maximum of 6 UMTS baseband boards. BBU Interconnectionenables two BBUs to support a maximum of 11 UMTS baseband boards, enhancing theUMTS baseband capacity of a base station. SRAN9.0 supports UMTS basebandinterconnection only.

NOTE

Unless otherwise specified, the BBU in this document refers to both the BBU3900 and BBU3910.

SingleRANBBU Interconnection Feature Parameter Description 2 Overview


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2.1 Introduction

2.2 Upgrade to Triple-Mode Base Stations

2.2.1 BBU SlotsA BBU has 11 slots, as shown in Figure 2-1.

Figure 2-1 BBU slots

2.2.2 Cable ConnectionsIn a triple-mode base station, two BBUs can be connected using the UCIU+UMPT or UMPT+UMPT interconnection method. Figure 2-2 shows inter-BBU cable connections in these twointerconnection methods.

Figure 2-2 Inter-BBU cable connections in the two interconnection methods in a triple-modebase station

Table 2-1 describes the UCIU+UMPT and UMPT+UMPT interconnection methods.



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Table 2-1 UCIU+UMPT and UMPT+UMPT interconnection methods

Interconnection Method

Application Scenario

BBU 0 BBU 1 CableConnection

UCIU+UMPT BBU3900+BBU3900;

A UCIU can beinstalled in anyone of slots 4, 5, 0,and 1 in BBU 0.The slot priority isas follows: slot 4 >slot 5 > slot 0 >slot 1.

A UMPT must beconfigured inBBU 1 for BBUinterconnection.

One of ports M0through M4 on theUCIU in BBU 0 isconnected to theCI port on theUMPT in BBU 1using a BBUinterconnectionsignal cable. PortsM0 through M4are prioritizedfrom the highestto the lowest.

UMPT+UMPT

BBU3900+BBU3900;BBU3900+BBU3910;BBU3910+BBU3910;

A UMPT isconfigured inBBU 0.

A UMPT isconfigured inBBU 1.

The CI port on theUMPT in BBU 0is connected to theCI port on theUMPT in BBU 1using a BBUinterconnectioncable.

In the connected BBUs shown in Figure 2-2, BBU 0 and BBU 1 are the root BBU and leaf BBU,respectively. You can identify whether a BBU serves as the root BBU or leaf BBU by using thefollowing methods:

l In the UCIU+UMPT interconnection, the BBU configured with a UCIU is the root BBU.l In the UMPT+UMPT interconnection, the BBU at the end with the Master color-coding

on the BBU interconnection signal cable is the root BBU. Fiber optic cables cannot connectBBUs in this interconnection method.

The root BBU and leaf BBU are determined in the site hardware planning.

A BBU interconnection signal cable is logically called CTRLLNK for an eGBTS, a NodeB oran eNodeB and is logically called BTSCTRLLNK for a GBTS. By default, BBU 1 is the localnode and BBU 0 is the upper-level node of a CTRLLNK or BTSCTRLLNK.

In UCIU+UMPT interconnection, SingleRAN9.0 supports a maximum of two CTRLLNKs fora NodeB or an eNodeB and two BTSCTRLLNKs for a GBTS.

In UMPT+UMPT interconnection, SingleRAN9.0 supports only one CTRLLNK for an eGBTS,a NodeB or an eNodeB and one BTSCTRLLNK for a GBTS.

2.2.3 Application ScenariosTable 2-2 lists the application scenarios for triple-mode base stations in SingleRAN9.0.



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Table 2-2 Application scenarios for triple-mode base stations

Scenario Working Mode of BBU 0 Working Mode of BBU 1

GU+L GU L

GL+U GL U

G*U*L + G*U*L G*U*L G*U*L

NOTE

l In a co-MPT base station where two BBUs are interconnected, the primary and secondary main controlboards are configured in BBU 0 and BBU 1, respectively. The modes configured in BBU 1 must alsobe configured in BBU 0. GSM cannot be configured in BBU 1.

l In triple-mode base stations, a board of a certain mode must be configured in the same BBU as themain control board of this mode. For details about the board configurations for each mode, see theBBU Hardware Description.

2.2.4 RestrictionsWhen UCIU+UMPT interconnection is used in a triple-mode base station, the followingrestrictions apply:

l GSM boards must be installed in BBU 0.l Monitoring devices must be connected to BBU 0.l Boards in the same BBU must have the same cabinet and subrack numbers. Boards in

different BBUs must have different cabinet numbers or both different cabinet and subracknumbers. Otherwise, common boards, such as the UCIU, cannot function.

l A BBU3910 cannot be configured with a UCIU.

When UMPT+UMPT interconnection is used in a triple-mode base station, the followingrestrictions apply in addition to the preceding restrictions:

l The distance between BBU 0 and BBU 1 must be less than or equal to 5 m.l BBU 1 must be configured with a UMPTb.l If BBU 0 is configured with the GTMU, WMPT, or LMPT, cascaded RRUs cannot be

connected to BBU 1.l Only BBU interconnection signal cables provided by Huawei can be used. Fiber optic

cables cannot be used.l Transmission cables must be connected to BBU 0.

NOTE

In the UMPT+UMPT interconnection and only one UMPT connects to external transmission equipmentscenario, if the transmission cable is removed from the original UMPT and reconnected to the other UMPT,you need to reset the later UMPT by pressing the reset button on the UMPT or removing and reinsertingthe UMPT.

2.2.5 Supported Features and FunctionsIn a triple-mode base station, two BBUs are connected using a BBU interconnection signal cable.The BBUs exchange control data, transmission data, and clock signals. Therefore, the BBUs



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support common transmission (co-transmission), inter-BBU software-defined radio (SDR), anda common clock.

Supported Featuresl Co-Transmission

When two BBUs are interconnected, the BBUs support co-transmission between two or moremodes. For details, see Common Transmission Feature Parameter Description.

l Common Clock

When two BBUs are interconnected, the BBUs support a common clock between two or moremodes. For details, see Common Clock Feature Parameter Description.

l Inter-BBU SDR

In inter-BBU SDR, a multimode RF module is connected to both BBUs. Figure 2-3 shows anexample of inter-BBU SDR in which BBU 0 supports GSM and BBU 1 supports LTE. The RXU(GL) is connected to both BBU 0 and BBU 1.

Figure 2-3 Inter-BBU SDR

NOTE

RXU refers to RRU and RFU.

Inter-BBU SDR clock signals for the secondary BBU must be synchronized with those for theprimary BBU. The clock signal synchronization mode is selected according to the followingrules:

l If the primary BBU uses frequency synchronization, the secondary BBU must usefrequency synchronization.

l If the primary BBU uses time synchronization, the secondary BBU can use either time orfrequency synchronization.

2.3 UMTS Baseband Capacity Expansion

2.3.1 Cable ConnectionsIn a triple-mode base station using BBU Interconnection, the WBBPf boards or UBBPd boardsin the BBUs can be interconnected to exchange baseband data.

Figure 2-4 shows the inter-BBU cable connections for UMTS baseband capacity expansion.



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Figure 2-4 Inter-BBU cable connections for UMTS baseband capacity expansion

A UMTS baseband board and a UMTS main control board are installed in both BBU 0 and BBU1, and the two UMTS baseband boards are interconnected using a BBU interconnection signalcable. Among UMTS baseband boards, WBBPf boards and UBBPd boards can provide HEIports for UMTS baseband interconnection. A WBBPf board or UBBPd board can be installedonly in slot 2 or slot 3 (preferred) in either BBU.

A BBU interconnection signal cable between WBBPf boards transmits baseband data andexpands baseband resources. A BBU interconnection signal cable between WBBPf boardscannot be used interchangeably with that for UCIU+UMPT or UMPT+UMPT interconnection.

A BBU baseband interconnection signal cable is logically called BBPLNK. Either end of aBBPLNK can be configured as the link head. It is recommended that you configure the end onthe BBU 0 side as the link head. SRAN9.0 supports only one BBPLNK.

NOTE

A CTRLLNK (for NodeB/eNodeB) or BTSCTRLLNK (for GBTS) must be set up before a BBPLINK.

2.3.2 Application ScenariosTable 2-3 lists the application scenarios for UMTS baseband capacity expansion inSingleRAN9.0.



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Table 2-3 Application scenarios for UMTS baseband capacity expansion

Scenario

WorkingMode of BBU0

WorkingMode of BBU1


GU+UL GU UL Just support UCIU+UMPT infrastructureinterconnection method

GU+U GU U Support UCIU+UMPT and UMPT+UMPTinfrastructure interconnection method

U+U U U

In the preceding scenarios, both BBU 0 and BBU 1 are configured with UMTS main controlboards.

NOTE

For details about the board configurations for each mode, see the BBU Hardware Description.

2.3.3 RestrictionsBoth BBU 0 and BBU 1 must be configured with one UMTS main control board to expand theUMTS baseband capacity, with the UMTS main control board in BBU 0 as primary and that inBBU 1 as secondary. If the ACT indicator on a main control board is steady on, this board is theprimary board. If the ACT indicator on a main control board is steady off, this board is thesecondary board.

The following local operations can be performed only on the primary main control board:

l Software upgrades and data configurations using a USB flash drive

l Local operations on the LMT

l Clock test

l Voltage Standing Wave Ratio (VSWR) testing using a USB flash drive

In addition, the following restrictions apply:

l Monitoring devices must be connected to BBU 0.

l In a NodeB deployed using the plug-and-play function, a UMPT working in UMTS modemust be configured in BBU 0.

l CPRI fiber optic cables can be connected to any WBBP in either BBU. It is recommendedthat all CPRI fiber optic cables be connected to the WBBP in BBU 0. For details aboutCPRI cable connections, see BBU Hardware Description.

l The secondary UMTS main control board in BBU 1 does not support co-transmission.

l Boards in the same BBU must have the same subrack and slot numbers. Boards in differentBBUs must have different subrack and slot numbers. Otherwise, common boards, such asthe UCIU, cannot function.

l Inter-BBU baseband resource sharing is supported only in the downlink.

l BBU interconnection cannot enable two NodeBs to be upgraded to one NodeB.



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l Inter-BBU multiple-input multiple-output (MIMO) is not supported. The main anddiversity RRUs serving MIMO cells must be connected to the same BBU.

l RRUs serving multi-RRU cells, distributed cells, or two cells in a DC-HSUPA or DC-HSDPA group must be connected to the same BBU.

l

l

l

l

l



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3 Related Features

The following features depend on BBU Interconnection:

l MRFD-211501 IP-Based Multi-mode Co-Transmission on BS side(GBTS)l MRFD-221501 IP-Based Multi-mode Co-Transmission on BS side(NodeB)l MRFD-231501 IP-Based Multi-mode Co-Transmission on BS side(eNodeB)l MRFD-211601 Multi-mode BS Common Reference Clock(GBTS)l MRFD-221601 Multi-mode BS Common Reference Clock(NodeB)l MRFD-231601 Multi-mode BS Common Reference Clock(eNodeB)

SingleRANBBU Interconnection Feature Parameter Description 3 Related Features


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4 Impact on the Network

4.1 Impact on System Capacityl BBU Interconnection does not affect system capacity when a triple-mode base station is

used.l A single-mode base station supports a maximum of 11 WBBPs after its UMTS baseband

capacity is expanded using BBU Interconnection. For details about the WBBP capacityspecifications, see the BBU Hardware Description. For details about the capacityspecifications after baseband capacity expansion, see 3900 Series Base Station TechnicalDescription.

4.2 Impact on Network PerformanceNo impact.

SingleRANBBU Interconnection Feature Parameter Description 4 Impact on the Network


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5 Engineering Guidelines

5.1 When to Use BBU InterconnectionBBU Interconnection is used to upgrade base stations to triple-mode base stations and for UMTSbaseband capacity expansion.

5.2 Information to Be CollectedCheck whether the distance between BBU 0 and BBU 1 is less than or equal to 5 m if you useUMPT+UMPT interconnection.

5.3 Network Planning

5.3.1 Software VersionsTable 5-1 lists the mapping between software versions and BBU interconnection methods.

Table 5-1 Mapping between software versions and BBU interconnection methods


BBU 0 BBU 1 Software Version

UCIU+UMPT BBU3900 BBU3900 l SingleRAN7.0 or laterl V100R007C00SPC280 or later if

UMPTb boards are used for BBUinterconnection.

UMPT+UMPT BBU3900 BBU3900 SingleRAN8.1 or later

BBU3900 BBU3910 SingleRAN9.0 or later

BBU3910 BBU3910

SingleRANBBU Interconnection Feature Parameter Description 5 Engineering Guidelines


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5.3.2 Subracks and Hardware Configurations for the BBUsFor the installation locations and hardware configurations of BBU 0 and BBU 1 in each cabinetwhen a new multimode base station is deployed, see 3900 Series Base Station HardwareDescription.

In UCIU+UMPT interconnection, the UCIU is controlled by only one single-mode main controlboard. Otherwise, ALM-26274 Inter-System Board Object Configuration Conflict is reported.UCIU-related alarms are reported only to the single-mode main control board controlling theUCIU.

When deploying a new Multimode base station, you are advised to comply with the followingrules to set the control mode for the UCIU:

l In UMTS baseband capacity expansion scenarios, UMTS is preferred to control the UCIU.

l In other scenarios, the mode priority descends from GSM, to UMTS, and then to LTE.

l In capacity expansion scenarios, it is recommended that the controlling mode of the UCIUremain unchanged. Alternatively, you can modify the controlling mode based oninformation provided in Table 5-2.

Table 5-2 lists the mode recommended for controlling the UCIU in each scenario.

Table 5-2 Mode recommended for controlling the UCIU in each scenario

Mode BBU0 Mode BBU1 Mode ModeRecommended forControlling theUCIU

GU+UL GU UL U

GU+U GU U U

U+U U U U

GU+L GU L G

GL+U GL U G

G*U*L+G*U*L G*U*L G*U*L N/A

During new Multimode base station deployment, the mode deployment order remains unchangedno matter whether the mode controlling the UCIU is first deployed. However, it is recommendedthat the mode controlling the UCIU be first deployed. By doing this, UCIU-related alarms canbe reported in time.

5.3.3 Transmission ModesWith BBU Interconnection, a base station supports the following:

l Independent transmission

l Inter-BBU co-transmission



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Independent TransmissionIn a triple-mode base station deployment scenario, each mode is connected to the transportnetwork through its own port and is deployed in the same way as that in a single-mode basestation.

In UMTS baseband capacity expansion scenarios, both BBUs have a UMTS main control board,and either BBU can be connected to the RNC through the Iub interface. However, it isrecommended that BBU 0 be connected to the RNC.

Inter-BBU Co-TransmissionFor engineering guidelines about co-transmission, see Common Transmission FeatureParameter Description. A multimode base station supports the following co-transmission modesto implement inter-BBU co-transmission:

l UMPT-based co-transmission through backplane interconnectionAll modes except the one controlling the UMPT send their data to the UMPT through BBUbackplanes and BBU interconnection signal cables. The co-transmission port on the UMPTis connected to the transport network, and the link between the port and transport networkcarries data of all the modes in the multimode base station.When deploying a multimode base station, first deploy the mode controlling the UMPT.Otherwise, other modes cannot be deployed.

l UTRPc-based co-transmission through backplane interconnectionAll modes send their data to the UTRPc through BBU backplanes and BBU interconnectionsignal cables. The co-transmission port on the UTRPc is connected to the transport network,and the link between the port and transport network carries data of all the modes in themultimode base station.When deploying a multimode base station, first deploy the mode controlling the UTRPc.Otherwise, other modes cannot be deployed.

In new multimode base station deployment scenarios, the UTRPc has the followingconfiguration restrictions:

l The UTRPc can be controlled by only one mode whose main control board is installed inthe same BBU as the UTRPc.

l When deploying a new multimode base station, it is recommended that you deploy thecontrol mode of a UTRPc following a priority descending from LTE, to UMTS, and thento GSM. By default, the UTRPc is controlled by UMTS before delivery.

Table 5-3 lists the mode recommended for controlling the UTRPc and the related modedeployment order when an Multimode base station works in different modes.



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Table 5-3 Mode recommended for controlling the UTRPc and related mode deployment orderwhen the Multimode base station works in different modes

UTRPcInstalledin...

Mode BBU0Mode

BBU1Mode

ModeRecommended forControllingthe UTRPc

ModeDeployment Order

Remarks

BBU0 GU+L GU L U (by defaultbeforedelivery)

UMTS >GSM =LTE

You can alsodeploy GSMfirst. If so,then youmust set thecontrolmode of theUTRPc toGSM byadding theUTRPc datato the BTSconfiguration file.

GL+U GL U L LTE >GSM =UMTS

N/A

GU+UL GU UL U (by defaultbeforedelivery)

UMTS >GSM =LTE

N/A

GU+U GU U U (by defaultbeforedelivery)

UMTS >GSM

N/A

U+U U U U (by defaultbeforedelivery)

N/A N/A

G*U*L+G*U*L

G*U*L G*U*L N/A N/A N/A

BBU1 GU+L GU L L LTE >GSM =UMTS

N/A

GL+U GL U U UMTS >GSM =LTE

N/A



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UTRPcInstalledin...

Mode BBU0Mode

BBU1Mode

ModeRecommended forControllingthe UTRPc

ModeDeployment Order

Remarks

GU+UL GU UL L LTE >GSM =UMTS

N/A

GU+U GU U Not supported N/A N/A

U+U U U Not supported N/A N/A

G*U*L+G*U*L

G*U*L G*U*L Not supported N/A N/A

In transmission mode transformation scenarios, you must minimize the impact on ongoingservices when selecting a control mode for the UTRPc.

For engineering guidelines about co-transmission, see the Common Transmission FeatureParameter Description.

5.3.4 CPRI-based Topologies

With Single-Mode RF ModulesIf single-mode RF modules are configured, chain, ring, and star topologies are supported. ForUMTS baseband expansion, the ring topology is not supported between two BBUs, as shownin Figure 5-1.



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Figure 5-1 Ring topology not supported between two BBUs

In UMPT+UMPT interconnection, only the star topology is supported for BBU 1 when the BBU0 is configured with the GTMU, WMPT, or LMPT, as shown in Figure 5-2.



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Figure 5-2 Ring topology not supported between two BBUs

With Multi-Mode RF ModulesIf multi-mode RF modules are configured, a dual-star topology must be used to achieve inter-BBU SDR.

Figure 5-3 and Figure 5-4 show two dual-star topology examples with GU RFUs and GU RRUs,respectively.



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Figure 5-3 Dual-star topology with RFUs (GU)

Figure 5-4 Dual-star topology with RRUs (GU)



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NOTE

For details about the CPRI-based topologies and specifications of CRPI ports, see RF Unit and TopologyManagement Feature Parameter Description and CPRI MUX Feature Parameter Description.

5.3.5 ClocksWith BBU Interconnection, a base station uses one of the following clocks:

l Independent reference clockl Common reference clock

Independent Reference ClockIn triple-mode base station deployment scenarios, the reference clock for each mode is the sameas that in a single-mode base station.

WBBPfIn UMTS baseband capacity expansion scenarios, both BBU 0 and BBU 1 have aWBBPf. The reference clock can be configured in either BBU.

Common Reference ClockThe common reference clock can be configured in either BBU 0 or BBU 1. The BBU configuredwith the common reference clock shares control data and clock signals with the other BBUthrough a BBU interconnection signal cable and the BBU backplane.

For engineering guidelines about the common reference clock, see Common Reference ClockParameter Description.

5.4 Feature Deployment

5.4.1 Deployment RequirementsNone.

5.4.2 Data Preparation

Upgrade to Triple-Mode Base StationsPerform the following steps to plan the data:

Step 1 Designate BBU0 and BBU1. Plan the cabinet number and subrack number for each BBU.

If BBU0 and BBU1 are configured in the same cabinet, their subrack numbers must be different.If they are configured in different cabinets, their subrack numbers can be the same.

Step 2 Plan the control links.

----End

The control link is logically CTRLLNK for NodeB or eNodeB, and BTSCTRLLNK for GBTS.

Physically, the control link is the BBU interconnection signal cable between the UCIU andUMPT.



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The two ends of each CTRLLNK/BTSCTRLLNK must be designated. By default, BBU1 is thelocal node and BBU0 is the upper-level node. The number of each CTRLLNK/BTSCTRLLNKfor the base station must be unique. The link numbers of all the CTRLLNKs/BTSCTRLLNKsneed to be planned.

A CTRLLNK/BTSCTRLLNK needs to be added for each mode of the base station.

Table 5-4 Parameters for CTRLLNK and BTSCTRLLNK

Parameter Name Parameter ID Setting Notes Data Source

Local Link No. LN Number ofCTRLLNK/BTSCTRLLNKGUI value range: 0 to255Recommendedvalue: 0, 1

Network plan

Local Cabinet No. CN Cabinet number ofBBU 1GUI value range: 0 to7

Network plan

Local Subrack No. SRN Subrack number ofBBU 1GUI value range: 0 to1

Network plan

Local Slot No. SN Slot number of theBBU 1 UMPT towhich the BBUinterconnectionsignal cable isconnectedIf BBUInterconnection isapplied, set thisparameter to 6 or 7based on siteconditions.

Network plan

Upper Cabinet No. UPCN Cabinet number ofBBU 0GUI value range: 0 to7

Network plan

Upper Subrack No. UPSRN Subrack number ofBBU 0GUI value range: 0 to1

Network plan



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Upper Slot No. UPSN Slot number of theBBU 0 UCIU towhich the BBUinterconnectionsignal cable isconnectedIf BBUInterconnection isapplied, set thisparameter to 4, 0, or7 based on siteconditions.

Network plan

Upper Port No. UPPT Port number of theBBU 0 UCIU towhich the BBUinterconnectionsignal cable isconnectedGUI value range: 0 to4, 8

Network plan

UMTS Baseband Capacity ExpansionPerform the following steps to plan the data:

Step 1 Designate BBU0 and BBU1. Plan the cabinet number and subrack number for each BBU.

If BBU0 and BBU1 are configured in the same cabinet, their subrack numbers must be different.If they are configured in different cabinets, their subrack numbers can be the same.

Step 2 Plan the control links. For details, see 2.2 Upgrade to Triple-Mode Base Stations.

Step 3 Plan the baseband processing link.

----End

The baseband processing link is logically BBPLNK. Physically, the baseband processing linkis the BBU interconnection signal cable between WBBPf boards.

The two ends of the BBPLNK must be designated. Either end of a BBPLNK can be configuredas the link head. It is recommended that you configure the end on the BBU 0 side as the linkhead. The default port number of the link head or tail is 6.

The number of the BBPLNK needs to be planned. Only one BBPLNK is supported inSingleRAN9.0.



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Table 5-5 Parameters for BBPLNK


Link No. LN Number of BBPLNKGUI value range: 0 to255Recommendedvalue: 0

Network plan

Head Cabinet No. HCN Cabinet number ofthe link headGUI value range: 0 to7

Network plan

Head Subrack No. HSRN Subrack number ofthe link headGUI value range: 0 to1

Network plan

Head Slot No. HSN Slot number of thelink headGUI value range: 2 to3

Network plan

Head Port No. HPN Default value: 6 Network plan

Tail Cabinet No. TCN Cabinet number ofthe link tailGUI value range: 0 to7

Network plan

Tail Subrack No. TSRN Subrack number ofthe link endGUI value range: 0 to1

Network plan

Tail Slot No. TSN Slot number of thelink endGUI value range: 2 to3

Network plan

Tail Port No. TPN Default value: 6 Network plan

5.4.3 Initial ConfigurationThe Configuration Management Express (CME) is recommended when initially configuring anew base station. Table lists references for initial configuration procedure.



24

Scenario Reference Document for InitialConfiguration Procedure

GU+L See 3900 Series Base Station InitialConfiguration Guide. Find Procedurethrough the following path: 3900 Series BaseStation Initial Configuration Guide > 3900Series Base Station Initial Configuration(Based on the CME) > Creating BaseStations > Creating a Single Separate-MPT Multimode Base Station >Configuring Device Data > Configuringthe Cabinet and BBU Data, ConfiguringBBU Interconnection Links.

GL+U

GU+UL

GU+U

U+U See 3900 Series Base Station InitialConfiguration Guide. Find Procedurethrough the following path: 3900 Series BaseStation Initial Configuration Guide > 3900Series Base Station Initial Configuration(Based on the CME) > Creating BaseStations > Creating a NodeB > Creating aSingle NodeB > Configuring NodeB DeviceData > Configuring the Cabinet and BBUData, Configuring BBU InterconnectionLinks.

G*U*L + G*U*L See 3900 Series Base Station InitialConfiguration Guide. Find Procedurethrough the following path: 3900 Series BaseStation Initial Configuration Guide > 3900Series Base Station Initial Configuration(Based on the CME) > Creating BaseStations > Creating a Single Co-MPT BaseStation > Configuring Device Data >Configuring the Cabinet and BBU Data,Configuring BBU Interconnection Links.

5.4.4 Activation ObservationAfter the initial configuration is complete, you can observe the status of CTRLLNK/BTSCTRLLNK at either the local or remote end. For alarms related to BBU Interconnection,see section "5.7 Troubleshooting."

At the Local End

Step 1 Check the status of the Mx indicator on the UCIU or the status of the CI indicator on the UMPTto determine whether CTRLLNK/BTSCTRLLNK is operating correctly.

l If the Mx indicator is green, CTRLLNK/BTSCTRLLNK is operating correctly.



25

l If the CI indicator is green, CTRLLNK/BTSCTRLLNK is operating correctly.

Step 2 Check the status of the HEI indicator on the WBBPf to determine whether BBPLNK is operatingcorrectly.

If the HEI indicator is green, BBPLNK is operating correctly.

----End

NOTE

Mx can be the M0, M1, M2, M3, or M4 port on the UCIU.

At the Remote Endl On the U2000 device panel, you can query the master/slave indication of the BBU

interconnection cable to check whether the cable is correctly connected. The yellow end isthe master port.

l On the U2000 maintenance console or the LMT, you can run the LST CTRLLNK/BTSCTRLLNK command to query the cabinet number, subrack number, slot number, andport number at both ends of the BBU interconnection signal cable.

NOTE

The two BBUs are classified into main subrack and extension subrack. If the subrack number of one endof the BBU interconnection signal cable is 0, the mode at this end is deployed in the main subrack. If thesubrack number of this end is 1, the BBU at the other end is the main subrack.

l Run the MML command DSP CTRLLNKSTAT/BTSCTRLLNKSTAT to checkwhether CTRLLNK/BTSCTRLLNK is operating correctly.

l Run the MML command DSP BBPLNK command to check whether BBPLNK isconfigured as planned.

5.5 Adjustment Examples

5.5.1 Adjustment from a GU Dual-Mode Base Station to a GU+LTriple-Mode Base Station

The following is examples of an upgrade from a GU dual-mode base station to a GU+L triple-mode base station.

Scenario 1: Figure 5-5 shows the hardware configuration before and after BBU Interconnection(UCIU+UMPT) is implemented.



26

Figure 5-5 Hardware changes in an upgrade from a GU dual-mode base station to a GU+L triple-mode base station (scenario 1)

l New hardware components

Have the following new hardware components ready:

Hardware Component Quantity Remarks

BBU subrack 1 -

UMPT 1 -

LBBP 1 -

UCIU 1 -

BBU interconnection signalcable between the UCIU andUMPT

1 The cable connects the Mport on the UCIU to the CIport on the UMPT.

SFP optical modules 2 -



27


CPRI cables, transmissioncables, clock signal cables,power cables, andmonitoring signal cables

Depending on the site plan -

l Hardware installation

Step 1 Install the UMPT_L and LBBP in BBU 1. Then, connect the power cables, monitoring signalcables, transmission cables, clock signal cables, and CPRI cables to the UMPT_L and LBBP.

Step 2 Install a UCIU in BBU 0.

Step 3 Use a BBU interconnection signal cable to connect the M0 port on the UCIU in BBU 0 to theCI port on the UMPT_L in BBU 1.

----End

l Data reconfiguration

For the procedure for reconfiguring data on the CME, see 3900 Series Base Station InitialConfiguration Guide. Find Procedure through the following path: 3900 Series Base StationInitial Configuration Guide > 3900 Series Base Station Initial Configuration (Based on theCME) > Creating Base Stations > Creating a Single Separate-MPT Multimode BaseStation > Configuring Device Data > Configuring the Cabinet and BBU Data,ConfiguringBBU Interconnection Links.

The data reconfiguration procedure using MML commands is as follows:

Step 1 On the GSM side, run the MML command ADD BTSBRD to add a UCIU for BBU 0.

Step 2 On the LTE side, run the MML command ADD CABINET to add a cabinet for BBU 1.

Step 3 On the LTE side, run the MML command ADD SUBRACK to add a subrack for BBU 1.

Step 4 On the LTE side, run the MML command ADD BRD to add a UMPT_L for BBU 1.

Step 5 On the LTE side, run the MML command ADD BRD to add an LBBP for BBU 1.

Step 6 On the UMTS and LTE sides, run the MML command ADDCTRLLNK to add a control link.On the GSM side, run the MML command ADD BTSCTRLLNK to add a control link. Forparameter settings, see the setting description in Table 5-4.

----End

Scenario 2: Figure 5-6 shows the hardware configuration before and after BBU Interconnection(UMPT+UMPT) is implemented.



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Figure 5-6 Hardware changes in an upgrade from a GU dual-mode base station to a GU+L triple-mode base station (scenario 2)


Before configuring data, ensure that the following hardware components are available.

New Hardware Component Quantity

BBU subrack 1

UMPT 1

LBBP 1

BBU interconnection signal cable with aMaster color-coding at one end

1

CPRI cables, transmission cables, clocksignal cables, power cables, andmonitoring signal cables

Depending on the site plan


Step 1 Install the UMPT_L and LBBP in BBU 1. Then, connect the power cables, monitoring signalcables, transmission cables, clock signal cables, and CPRI cables to the UMPT_L and LBBP.



29

Step 2 Use a BBU interconnection cable with a Master color-coding at one end to connect BBU 0 andBBU 1. Connect the end with the Master color-coding to the CI port on the UMPT_U in BBU0 and the other end to the CI port on the UMPT_L in BBU 1.

NOTE

The BBU interconnection signal cable connecting two UMPTs in the BBUs has a Master color-coding at oneend. When connecting two UMPTs, you must connect the end with the Master color-coding to the CI port onthe UMPT in BBU 0.

----End


For the procedure for reconfiguring data on the CME, see 3900 Series Base Station InitialConfiguration Guide. Find Procedure through the following path: 3900 Series Base StationInitial Configuration Guide > 3900 Series Base Station Initial Configuration (Based on theCME) > Creating Base Stations > Creating a Single Separate-MPT Multimode BaseStation > Configuring Device Data > Configuring the Cabinet and BBU Data, ConfiguringBBU Interconnection Links.


Step 1 On the GSM side, run the MML command ADD BTSBRD to add a UCIU for BBU 0.

Step 2 On the LTE side, run the MML command ADD CABINET to add a cabinet for BBU 1.

Step 3 On the LTE side, run the MML command ADD SUBRACK to add a subrack for BBU 1.

Step 4 On the LTE side, run the MML command ADD BRD to add a UMPT_L for BBU 1.

Step 5 On the LTE side, run the MML command ADD BRD to add an LBBP for BBU 1.


----End

5.5.2 UMTS Baseband Capacity Expansion from a GU+L to a GU+UL Triple-Mode Base Station

Perform the following steps to expand UMTS baseband capacity:

Step 1 Add a control link for each mode.

Step 2 Add a subrack to BBU1.

Step 3 Add a baseband processing link between BBU0 and BBU1.

----End

NOTE

l The BBU interconnection signal cable refers to the one used to connect any of ports M0 through M4 on theUCIU to the CI port on the UMPT.

l The Huawei QSFP electrical cable is used to connect the WBBPf boards in two BBUs.



30

l Scenario 1: From GU+L triple-mode base station (with WBBPf in BBU0 slot 3) to GU+ULtriple-mode base station

Figure 5-7 shows the hardware before and after BBU Interconnection.

Figure 5-7 Hardware changes for UMTS baseband capacity expansion (scenario 1)





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WBBPf 1 -

UMPT 1 -

BBU interconnection signalcable

1 connects the M port on theUCIU to the CI port on theUMPT

Multi-mode SFP opticalmodules

2 -

QSFP cables provided byHuawei

1 connects the HEI port on twoWBBPf boards


Step 1 Install a UMPT_U and a WBBPf in BBU 1.


Step 3 Use a Huawei QSFP electrical cable to connect the HEI port on the WBBPf in slot 2 in BBU 1to the HEI port on the WBBPf in slot 3 in BBU 0.

----End


For the procedure for reconfiguring data on the CME, see 3900 Series Base Station InitialConfiguration Guide. Find Procedure through the following path: 3900 Series Base StationInitial Configuration Guide > 3900 Series Base Station Initial Configuration (Based on theCME) > Creating Base Stations > Creating a Single Separate-MPT Multimode BaseStation > Configuring Device Data > Configuring the Cabinet and BBU Data, ConfiguringBBU Interconnection Links.


Step 1 On the UMTS side, run the MML command ADD SUBRACK to add a subrack for BBU 1.

Step 2 On the UMTS side, run the MML command ADD BRD to add a UMPT_U for BBU 1.

Step 3 On the UMTS side, run the MML command ADD BRD to add a WBBPf for BBU 1.


Step 5 On the UMTS side, run the MML command ADD BBPLNK to add a baseband processing link.For parameter settings, see the setting description in Table 5-5



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NOTE

Uplink resource groups cannot be configured across BBUs. Downlink resource groups can be configuredacross BBUs. The number of resource groups depends on the actual planning for each site.

----End

l Scenario 2: From GU+L triple-mode base station (with the WBBPd in slot 3 of BBU0 andslot 2 of BBU0 empty) to GU+UL triple-mode base station

Figure 5-8 shows the hardware before and after BBU Interconnection.





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WBBPf 2 -

UMPT 1 -




2 -





Step 2 Install a WBBPf in slot 2 in BBU 0.



----End


For the procedure for reconfiguring data on the CME, see 3900 Series Base Station InitialConfiguration Guide. Find Procedure through the following path: 3900 Series Base StationInitial Configuration Guide > 3900 Series Base Station Initial Configuration (Based on theCME) > Creating Base Stations > Creating a Single Separate-MPT Multimode BaseStation > Configuring Device Data > Configuring the Cabinet and BBU Data,ConfiguringBBU Interconnection Links.









34

Step 6 On the UMTS side, run the MML command ADD BBPLNK to add a baseband processing link.For parameter settings, see the setting description in Table 5-5.

----End

NOTE

Uplink resource group cannot be configured across BBUs. Downlink resource groups can be configuredacross BBUs. The number of resource groups depends on the actual planning for each site.

l Scenario 3: From GU+L triple-mode base station (with WBBPds in slots 2 and 3 of BBU0)to GU+UL triple-mode base station

Figure 5-9shows the hardware before and after BBU Interconnection.




35




WBBPf 2 -

UMPT 1 -




2 -





Step 2 Remove the CPRI fiber optic cable from the WBBPd in slot 3 in BBU 0 and move the WBBPdto slot 0 in BBU 1.

Step 3 Install the WBBPf in slot 3 in BBU 0

Step 4 Connect the fiber optic cable removed in Step 4 to the WBBPf in slot 3 in BBU 0.



----End


For the procedure for reconfiguring data on the CME, see 3900 Series Base Station InitialConfiguration Guide. Find Procedure through the following path: 3900 Series Base StationInitial Configuration Guide > 3900 Series Base Station Initial Configuration (Based on theCME) > Creating Base Stations > Creating a Single Separate-MPT Multimode BaseStation > Configuring Device Data >Configuring the Cabinet and BBU Data,ConfiguringBBU Interconnection Links.







36

Step 4 On the UMTS side, run the MML command ADD BRD to add a WBBPd for BBU 1.


Step 6 On the UMTS side, run theMML command ADD BBPLNK to add a baseband processing link.For parameter settings, see the setting description in Table 5-5.

----End

NOTE

Uplink resource group cannot be configured across BBUs. Downlink resource groups can be configuredacross BBUs. The number of resource groups depends on the actual planning for each site.

5.6 Performance OptimizationN/A

5.7 TroubleshootingTable 5-6 lists the alarms related to BBU Interconnection. For details, see the related alarmreference documents.

Table 5-6 Table Alarms related to BBU Interconnection

Alarm ID Alarm Name Alarm Description

26310 Inter-BBU Optical ModuleFault

This alarm is reported whenthe optical module on aninter-BBU port is faulty.

26311 Inter-BBU Optical ModuleNot in Position

This alarm is reported whenthe optical module on aninter-BBU port cannot bedetected or the cable for theinter-BBU electrical port isimproperly connected. InUMTS mode, this alarm isonly reported to a 2U BBU.

26312 Inter-BBU Optical ModuleReceive Failure

This alarm is reported whenthe optical link (at thephysical layer) between BBUports fails to receive opticalsignals. This alarm is onlyreported by a 2U BBU.



37

Alarm ID Alarm Name Alarm Description

26313 Inter-BBU Optical ModuleTransmit Failure

This alarm is reported whenthe optical module on aninter-BBU port fails totransmit data. This alarm isonly reported by a 2U BBU.

26314 Inter-BBU Port Failure This alarm is reported whenan inter-BBU port fails totransmit or receive data. InUMTS mode, this alarm isreported only by a 2U BBU.

26315 Inter-BBU Port ConnectionError

An inter-BBU interface onthe UCIU can be an M port oran S port. Inter-BBUinterfaces of the same typecannot be connected, and aring network is not allowed ifinter-BBU interfaces areconnected. This alarm isreported when inter-BBUinterfaces of the same typeare connected, or a ringnetwork is set up in the caseof an inter-BBU connection.

26240 BBU Topology andConfiguration Mismatch

This alarm is reported whenthe configured and actualinter-BBU connectiontopologies are inconsistent.In UMTS mode, this alarm isonly reported to a 2 U BBU.

26274 Inter-System Board ObjectConfiguration Conflict

In multi-mode configuration,this alarm is reported whenthe cabinet/subrack/slotconfiguration of a board isinconsistent in differentmodes, or when the cabinet/subrack/slot configuration ofdifferent boards is the samein different modes, or when aboard supporting only acertain mode is configuredfor different modes.



38

6 Parameters

Table 6-1 Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

LN BTS3900,BTS3900WCDMA,BTS3900 LTE

ADDCTRLLNKLST CTRLLNKMODCTRLLNKRMVCTRLLNK

None None Meaning:Indi-cates the numberof the controllink at the localend.GUI ValueRange:0~255Unit:NoneActual ValueRange:0~255DefaultValue:None

CN BTS3900,BTS3900WCDMA,BTS3900 LTE

ADDCABINETDSPCABMFRINFOLST CABINETMODCABINETRMVCABINET

None None Meaning:Indi-cates the cabinetnumber.GUI ValueRange:0~62Unit:NoneActual ValueRange:0~62DefaultValue:None

SingleRANBBU Interconnection Feature Parameter Description 6 Parameters


39



SRN BTS3900,BTS3900WCDMA,BTS3900 LTE

ADDSUBRACKLSTSUBRACKMODSUBRACKRMVSUBRACK

None None Meaning:Indi-cates the numberof the subrack.GUI ValueRange:0~254Unit:NoneActual ValueRange:0~254DefaultValue:None

UPCN BTS3900,BTS3900WCDMA,BTS3900 LTE

ADDCTRLLNKMODCTRLLNKLST CTRLLNK

None None Meaning:Indi-cates the cabinetnumber of theupper-levelnode at the otherend of thecontrol link.GUI ValueRange:0~7Unit:NoneActual ValueRange:0~7DefaultValue:None

UPSRN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates thesubrack numberof the upper-level node at theother end of thecontrol link.GUI ValueRange:0~1Unit:NoneActual ValueRange:0~1DefaultValue:None



40



UPSN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates the slotnumber of theupper-levelnode at the otherend of thecontrol link.GUI ValueRange:0~7Unit:NoneActual ValueRange:0~7DefaultValue:None

UPPT BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates the portnumber of theupper-levelnode at the otherend of thecontrol link.Values 0 to 4indicate theports M0 to M4on the UCIU,and value 8indicates the CIport on theUMPT.GUI ValueRange:0~4,8Unit:NoneActual ValueRange:0~4,8DefaultValue:None



41



LN BTS3900,BTS3900WCDMA,BTS3900 LTE

ADD BBPLNKLST BBPLNKMOD BBPLNKRMV BBPLNK

None None Meaning:Indi-cates the numberof theinterconnectionlink.GUI ValueRange:0~255Unit:NoneActual ValueRange:0~255DefaultValue:None

HCN BTS3900,BTS3900WCDMA,BTS3900 LTE

ADD BBPLNKMOD BBPLNKLST BBPLNK

None None Meaning:Indi-cates the cabinetnumber of thehead node at oneend of theinterconnectionlink.GUI ValueRange:0~7Unit:NoneActual ValueRange:0~7DefaultValue:None

HSRN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates thesubrack numberof the head nodeat one end of theinterconnectionlink.GUI ValueRange:0~1Unit:NoneActual ValueRange:0~1DefaultValue:None



42



HSN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates the slotnumber of thehead node at oneend of theinterconnectionlink.GUI ValueRange:0~5Unit:NoneActual ValueRange:0~5DefaultValue:None

HPN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates the portnumber of thehead node at theother end of theinterconnectionlink. This portindicates theport HEI on theboard panel.GUI ValueRange:6Unit:NoneActual ValueRange:6Default Value:6



43



TCN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates the cabinetnumber of thetail node at oneend of theinterconnectionlink.GUI ValueRange:0~7Unit:NoneActual ValueRange:0~7DefaultValue:None

TSRN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates thesubrack numberof the tail node atone end of theinterconnectionlink.GUI ValueRange:0~1Unit:NoneActual ValueRange:0~1DefaultValue:None

TSN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates the slotnumber of thetail node at oneend of theinterconnectionlink.GUI ValueRange:0~5Unit:NoneActual ValueRange:0~5DefaultValue:None



44



TPN BTS3900,BTS3900WCDMA,BTS3900 LTE


None None Meaning:Indi-cates the portnumber of thetail node at oneend of theinterconnectionlink. This portindicates theport HEI on theboard panel.GUI ValueRange:6Unit:NoneActual ValueRange:6Default Value:6



45

7 Counters

There are no specific counters associated with this feature.

SingleRANBBU Interconnection Feature Parameter Description 7 Counters


46

8 Reference Documents

1. Common Transmission Feature Parameter Description2. Common Clock Feature Parameter Description3. MML Command Reference4. Parameter Reference5. MO Reference6. Alarm Reference7. 3900 Series Base Stations Initial Configuration8. 3900 Series Base Station Technical Description9. 3900 Series Base Station Commissioning Guide10. 3900 Series Base Station Hardware Description11. 3900 Series Base Station Initial Configuration Guide12. RF Unit and Topology Management

SingleRANBBU Interconnection Feature Parameter Description 8 Reference Documents


47

bbu interconnection(sran9.0_draft a)

Documents

huawei trademarks

huawei proprietary

huawei industrial basebantian

thepurchase scope

usage scope

triplemode base stations

trade names

respective holders