bbu interconnection(sran8.0 02)

8/12/2019 BBU Interconnection(SRAN8.0 02)

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SingleRAN

BBU Interconnection Feature

Parameter Description

Issue 02

Date 2013-07-30

HUAWEI TECHNOLOGIES CO., LTD.


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Copyright Huawei Technologies Co., Ltd. 2013. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and the

customer. All or part of the products, services and features described in this document may not be within the

purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,

and recommendations in this document are provided "AS IS" without warranties, guarantees or representations

of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 02 (2013-07-30) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i
http://www.huawei.com/


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Contents

1 About This Document..................................................................................................................1

1.1 Scope..............................................................................................................................................................................1

1.2 Intended Audience..........................................................................................................................................................1

1.3 Change History...............................................................................................................................................................1

2 Overview.........................................................................................................................................4

2.1 Introduction....................................................................................................................................................................4

2.2 Upgrade to Triple-Mode Base Stations..........................................................................................................................4

2.2.1 BBU Slots....................................................................................................................................................................4

2.2.2 Cable Connections.......................................................................................................................................................4

2.2.3 Application Scenarios..................................................................................................................................................5

2.2.4 Restrictions..................................................................................................................................................................6

2.2.5 Supported Features and Functions...............................................................................................................................6

2.3 UMTS Baseband Capacity Expansion...........................................................................................................................72.3.1 Cable Connections.......................................................................................................................................................7

2.3.2 Application Scenarios..................................................................................................................................................8

2.3.3 Restrictions..................................................................................................................................................................8

3 Related Features...........................................................................................................................10

4 Impact on the Network...............................................................................................................11

4.1 Impact onSystem Capacity..........................................................................................................................................11

4.2 Impact onNetwork Performance..................................................................................................................................11

5 Engineering Guidelines.............................................................................................................125.1 When to Use BBU Interconnection..............................................................................................................................12

5.2 Information to Be Collected.........................................................................................................................................12

5.3 Network Planning.........................................................................................................................................................12

5.3.1 Software Versions......................................................................................................................................................12

5.3.2 Subracks and Hardware Configurations for the BBUs..............................................................................................12

5.3.3 Transmission Modes..................................................................................................................................................13

5.3.4 CPRI-based Topologies.............................................................................................................................................16

5.3.5 Clocks........................................................................................................................................................................19

5.4 Feature Deployment.....................................................................................................................................................19

5.4.1 Deployment Requirements........................................................................................................................................19

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5.4.2 Data Preparation........................................................................................................................................................19

5.4.3 Initial Configuration..................................................................................................................................................22

5.4.4 Activation Observation..............................................................................................................................................23

5.5 Adjustment Examples...................................................................................................................................................24

5.5.1 Adjustment from a GU Dual-Mode Base Station to a GU+L Triple-Mode Base Station.........................................24

5.5.2 UMTS Baseband Capacity Expansion from a GU+L to a GU+UL Triple-Mode Base Station................................26

5.6 Performance Optimization............................................................................................................................................33

5.7 Troubleshooting............................................................................................................................................................33

6 Parameters.....................................................................................................................................35

7 Counters........................................................................................................................................42

8 Reference Documents.................................................................................................................43

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1About This Document

1.1 Scope

This document describes the BBU Interconnection feature, including its implementation

principles, 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) and BTS3900A(Ver.D)

l BTS3900AL(Ver.A)

l DBS3900

Any managed objects (MOs), parameters, alarms, or counters described in this document

correspond to the software release delivered with this document. In the event of updates, the

updates will be described in the product documentation delivered with the latest software release.

1.2 Intended Audience

This 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 History

This section provides information about the changes in different document versions.

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

l Feature change

Changes in features of a specific product version.

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l Editorial change

Changes in wording or the addition of information that was not described in the earlier

version.

02 (2013-07-30)

This issue includes the following changes.

Change Type Change Description Parameter Change

Feature change None None

Editorial change Upgraded the figures of the

whole document;

Modified the descriptions in

section "2 Overview".

None

01 (2013-04-28)

This issue includes the following changes.


Feature change Added the G*U*L co-MPT

scenary in section "2.2.3

Application Scenarios" of

"2.2 Upgrade to Triple-

Mode Base Stations"

chapter

None

Editorial change None None

Draft A (2013-01-15)

Compared with 04 (2012-12-10) of SRAN7.0, Draft A (2013-01-15) of SRAN8.0 iincludes the

following changes.


Feature change None None

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Editorial change In sections "2.2.4

Restrictions" and "2.3.3

Restrictions":l Modified slot restrictions

for the UCIU.

l Imposed restrictions on

the planning of boards'

cabinet and subrack

numbers.

l Specified cells that must

be configured for the

same BBU.

None

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2Overview

2.1 Introduction

In BBU Interconnection, two BBUs are connected using aBBU interconnection signal cable.

The BBU Interconnection feature applies to the following scenarios:

l Triple-mode base station deployment

With 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 expansion

A single BBU supports a maximum of 6 UMTS baseband boards. BBU Interconnection

enables two BBUs to support a maximum of 11 UMTS baseband boards, enhancing the

UMTS baseband capacity of a base station. SingleRAN8.0 supports only UMTS baseband

interconnection.

2.2 Upgrade to Triple-Mode Base Stations

2.2.1 BBU Slots

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

Figure 2-1BBU slots

2.2.2 Cable Connections

Figure 2-2shows the cable connections between the UCIU and UMPT. The UCIU can be

installed in any of slots 4, 5, 0, and 1 in BBU 0. The slot priority is as follows: slot 4 > slot 5 >

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slot 0 > slot 1. A UMPT must be configured in BBU 1. One of ports M0 through M4 on the

UCIU in BBU 0 is connected to the CI port on the UMPT in BBU 1 using a BBU interconnection

signal cable. Ports M0 through M4 are prioritized from the highest to the lowest.

Figure 2-2Interconnected UCIU and UMPT in two BBUs in a triple-mode base station

In the above figures, BBU 0 is the root BBU and BBU 1 is the leaf BBU. The root and leaf BBUs

are determined by the hardware plan of each site. The BBU configured with the UCIU is regarded

as the root BBU.

A BBU interconnection signal cable is logically called CTRLLNK for a NodeB or an eNodeB

and is logically called BTSCTRLLNK for a GBTS. By default, BBU 1 is the local node andBBU 0 is the upper-level node of a CTRLLNK or BTSCTRLLNK. SingleRAN8.0 supports a

maximum of two CTRLLNKs for a NodeB or an eNodeB and two BTSCTRLLNKs for a GBTS.

2.2.3 Application Scenarios

Table 2-1lists the application scenarios of triple-mode base stations.

Table 2-1Application scenarios of triple-mode base stations

Mode BBU0 Mode BBU1 Mode

GU+L GU L

GL+U GL U

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

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NOTE

In this document, G, U, and L stand for GSM, UMTS, and LTE, respectively.

In a co-MPT base station where two BBUs are interconnected, the primary and secondary main control

boards are configured in BBU 0 and BBU 1, respectively. The modes configured in BBU 1 must also be

configured in BBU 0. GSM cannot be configured in BBU 1.

In triple-mode base station scenarios, the mode of boards in a BBU must be consistent with the mode of

the main control board in the BBU. For details about board configurations for each mode, see hardware

descriptions of the relevant base stations.

2.2.4 Restrictions

When UCIU+UMPT interconnection is used in a triple-mode base station, the following

restrictions 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 subrack

numbers. Otherwise, common boards, such as the UCIU, cannot function.

2.2.5 Supported Features and Functions

In triple-mode base station scenarios, the two BBUs are connected by a BBU interconnection

signal cable. The BBUs exchange control data, transmission data, and clock signals. Therefore,

common transmission (co-transmission), software-defined radio (SDR), and a common clock

are supported between the two BBUs. Two interconnected BBUs are regarded as one base station

in the radio access network topology.

The supported features are as follows:

l Co-Transmission

When two BBUs are interconnected, the BBUs support co-transmission between two or

more modes. For details, see the Common Transmission Feature Parameter Description.

l Common Clock

When two BBUs are interconnected, the BBUs support a common clock between two or

more modes. For details, see the Common Clock Feature Parameter Description.

l Inter-BBU SDR

The inter-BBU SDR function is supported when two BBUs are interconnected. In this scenario,a multi-mode RF module must be connected to both BBUs.Figure 2-3shows an example of

inter-BBU SDR, wherein BBU0 supports GSM, BBU1 supports LTE, and the GL RXU is

connected to BBU0 and BBU1.

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Figure 2-3Inter-BBU SDR

2.3 UMTS Baseband Capacity Expansion

2.3.1 Cable ConnectionsIn the UCIU+UMPT mode, the WBBPfs in the two BBUs can be connected to exchange

baseband data.

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

Figure 2-4Cables connections for UMTS baseband capacity expansion

A UMTS baseband board and a UMTS main control board are installed in both BBU 0 and BBU

1, and the two UMTS baseband boards are interconnected using a BBU interconnection signal

cable. Among UMTS baseband boards, only the WBBPf provides an HEI port for UMTS

baseband interconnection. The WBBPf can be installed only in slot 2 or slot 3 (preferred) in

either BBU.

A BBU interconnection signal cable between WBBPf boards transmits baseband data and

expands baseband resources. A BBU interconnection signal cable between WBBPf boards

cannot be used interchangeably with that for UCIU+UMPT or UMPT+UMPT interconnection.

A BBU interconnection signal cable between WBBPf boards is logically called BBPLNK. Either

end of a BBPLNK can be configured as the link head. It is recommended that you configure the

end on the BBU 0 side as the link head. SRAN8.1 supports only one BBPLNK.

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NOTE

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

2.3.2 Application Scenarios

Table 2-2lists the application scenarios of UMTS baseband capacity expansion.

Table 2-2Application scenarios of UMTS baseband capacity expansion

Mode BBU0 Mode BBU1 Mode

GU+UL GU UL

GU+U GU U

U+U U U

In these scenarios, both BBU0 and BBU1 have UMTS main control boards.

NOTE

For details about board configurations for each mode, see hardware descriptions of the relevant base

stations.

2.3.3 Restrictions

Both 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 in

BBU 1 as secondary. If the ACT indicator on a main control board is steady on, this board is the

primary board. If the ACT indicator on a main control board is steady off, this board is the

secondary 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 mode

must be configured in BBU 0.

l CPRI fiber optic cables can be connected to any WBBP in either BBU. It is recommended

that all CPRI fiber optic cables be connected to the WBBP in BBU 0. For details about

CPRI cable connections, see the hardware description of the related base stations.

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

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l Boards in the same BBU must have the same subrack and slot numbers. Boards in different

BBUs must have different subrack and slot numbers. Otherwise, common boards, such as

the 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.

l Inter-BBU multiple-input multiple-output (MIMO) is not supported. The main and

diversity 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.

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3Related FeaturesThe 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)

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4Impact on the Network

4.1 Impact on System Capacity

l 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 capacity

specifications, see the hardware description of the related base stations. For details about

the capacity specifications after baseband capacity expansion, see 3900 Series Base

StationTechnical Description.

4.2 Impact on Network Performance

No impact.

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5Engineering Guidelines

5.1 When to Use BBU Interconnection

BBU Interconnection is used to upgrade base stations to triple-mode base stations and for UMTS

baseband capacity expansion.

5.2 Information to Be Collected

None.

5.3 Network Planning

The following network planning needs to be performed before BBU Interconnection can be

deployed:

l Software versions

l Subracks and hardware configurations for the BBUs

l Transmission modes

l CPRI-based topologies

l Clocks

5.3.1 Software Versions

The software version must be SingleRAN7.0 or later.

5.3.2 Subracks and Hardware Configurations for the BBUs

For the installation locations and hardware configurations of BBU 0 and BBU 1 in each cabinet

when a new multimode base station is deployed, see the hardware description of the related base

stations.

In UCIU+UMPT interconnection, the UCIU is controlled by only one single-mode main control

board. Otherwise, ALM-26274 Inter-System Board Object Configuration Conflict is reported.

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UCIU-related alarms are reported only to the single-mode main control board controlling the

UCIU.

When deploying a new Multimode base station, you are advised to comply with the following

rules 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 UCIU

remain unchanged. Alternatively, you can modify the controlling mode based on

information provided in Table 5-1.

Table 5-1lists the mode recommended for controlling the UCIU in each scenario.

Table 5-1Mode 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 unchanged

no matter whether the mode controlling the UCIU is first deployed. However, it is recommended

that the mode controlling the UCIU be first deployed. By doing this, UCIU-related alarms can

be reported in time.

5.3.3 Transmission Modes

With BBU Interconnection, a base station supports the following:

l Independent transmission

l Inter-BBU co-transmission

Independent Transmission

In a triple-mode base station deployment scenario, each mode is connected to the transport

network through its own port and is deployed in the same way as that in a single-mode base

station.

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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 is

recommended that BBU 0 be connected to the RNC.

Inter-BBU Co-TransmissionFor engineering guidelines about co-transmission, see Common Transmission Feature

Parameter Description. A multimode base station supports the following co-transmission modes

to implement inter-BBU co-transmission:

l UMPT-based co-transmission through backplane interconnection

All modes except the one controlling the UMPT send their data to the UMPT through BBU

backplanes and BBU interconnection signal cables. The co-transmission port on the UMPT

is connected to the transport network, and the link between the port and transport network

carries 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 interconnection

All modes send their data to the UTRPc through BBU backplanes and BBU interconnection

signal 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 the

multimode 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 following

configuration restrictions:l The UTRPc can be controlled by only one mode whose main control board is installed in

the same BBU as the UTRPc.

l When deploying a new multimode base station, it is recommended that you deploy the

control mode of a UTRPc following a priority descending from LTE, to UMTS, and then

to GSM. By default, the UTRPc is controlled by UMTS before delivery.

Table 5-2lists the mode recommended for controlling the UTRPc and the related mode

deployment order when an Multimode base station works in different modes.

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Table 5-2Mode recommended for controlling the UTRPc and related mode deployment order

when the Multimode base station works in different modes

UTRPcInstalled

in...

Mode BBU0Mode

BBU1Mode

ModeRecommen

ded forControllingthe UTRPc

ModeDeploym

ent Order

Remarks

BBU0 GU+L GU L U (by default

before

delivery)

UMTS >

GSM =

LTE

You can also

deploy GSM

first. If so,

then you

must set the

control

mode of the

UTRPc to

GSM by

adding the

UTRPc data

to the BTS

configuratio

n file.

GL+U GL U L LTE >

GSM =

UMTS

N/A

GU+UL GU UL U (by default

before

delivery)

UMTS >

GSM =

LTE

N/A

GU+U GU U U (by default

before

delivery)

UMTS >

GSM

N/A

U+U U U U (by default

before

delivery)

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 forControlling

the 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 ongoing

services when selecting a control mode for the UTRPc.

For engineering guidelines about co-transmission, see the Common Transmission Feature

Parameter Description.

5.3.4 CPRI-based Topologies

With Single-Mode RF Modules

If single-mode RF modules are configured, chain, ring, and star topologies are supported. For

UMTS baseband expansion, the ring topology is not supported between two BBUs, as shown

in Figure 5-1.

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Figure 5-1Ring topology not supported between two BBUs

With Multi-Mode RF Modules

If multi-mode RF modules are configured, a dual-star topology must be used to achieve inter-

BBU SDR.

Figure 5-2and Figure 5-3show two dual-star topology examples with GU RFUs and GU RRUs,

respectively.

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Figure 5-2Dual-star topology with RFUs (GU)

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

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NOTE

For details about the CPRI-based topologies and specifications of CRPI ports, seeRF Unit and Topology

Management Feature Parameter Descriptionand CPRI MUX Feature Parameter Description.

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

l Independent reference clock

l Common reference clock

Independent Reference Clock

In triple-mode base station deployment scenarios, the reference clock for each mode is the same

as 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 Clock

The common reference clock can be configured in either BBU 0 or BBU 1. The BBU configured

with the common reference clock shares control data and clock signals with the other BBU

through a BBU interconnection signal cable and the BBU backplane.

For engineering guidelines about the common reference clock, see Common Reference Clock

Parameter Description.

5.4 Feature Deployment

5.4.1 Deployment Requirements

None.

5.4.2 Data Preparation

Upgrade to Triple-Mode Base Stations

Perform 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 and

UMPT.

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The two ends of each CTRLLNK/BTSCTRLLNK must be designated. By default, BBU1 is the

local node and BBU0 is the upper-level node. The number of each CTRLLNK/BTSCTRLLNK

for the base station must be unique. The link numbers of all the CTRLLNKs/BTSCTRLLNKs

need to be planned.

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

Table 5-3Parameters for CTRLLNK and BTSCTRLLNK

Parameter Name Parameter ID Setting Notes Data Source

Local Link No. LN Number of

CTRLLNK/

BTSCTRLLNK

GUI value range: 0 to

255

Recommended

value: 0, 1

Network plan

Local Cabinet No. CN Cabinet number of

BBU 1


7

Network plan

Local Subrack No. SRN Subrack number of

BBU 1


1

Network plan

Local Slot No. SN Slot number of the

BBU 1 UMPT to

which the BBU

interconnection

signal cable is

connected

If BBU

Interconnection is

applied, set this

parameter to 6 or 7based on site

conditions.

Network plan

Upper Cabinet No. UPCN Cabinet number of

BBU 0


7

Network plan

Upper Subrack No. UPSRN Subrack number of

BBU 0


1

Network plan

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Upper Slot No. UPSN Slot number of the

BBU 0 UCIU to

which the BBUinterconnection

signal cable is

connected

If BBU

Interconnection is

applied, set this

parameter to 4, 0, or

7 based on site

conditions.

Network plan

Upper Port No. UPPT Port number of the

BBU 0 UCIU towhich the BBU

interconnection

signal cable is

connected


4, 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 link

is the BBU interconnection signal cable between WBBPf boards.

The two ends of the BBPLNK must be designated. Either end of a BBPLNK can be configured

as the link head. It is recommended that you configure the end on the BBU 0 side as the link

head. 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 in

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Table 5-4Parameters for BBPLNK


Link No. LN Number of BBPLNK


255

Recommended

value: 0

Network plan

Head Cabinet No. HCN Cabinet number of

the link head


7

Network plan

Head Subrack No. HSRN Subrack number of

the link headGUI value range: 0 to

1

Network plan

Head Slot No. HSN Slot number of the

link head


3

Network plan

Head Port No. HPN Default value: 6 Network plan

Tail Cabinet No. TCN Cabinet number of

the link tail


7

Network plan

Tail Subrack No. TSRN Subrack number of

the link end


1

Network plan

Tail Slot No. TSN Slot number of the

link end

GUI value range: 2 to3

Network plan

Tail Port No. TPN Default value: 6 Network plan

5.4.3 Initial Configuration

The Configuration Management Express (CME) is recommended when initially configuring a

new base station. Table lists references for initial configuration procedure.

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Scenario Reference Document for InitialConfiguration Procedure

GU+L See 3900 Series Base Station Initial

Configuration Guide. Find Procedurethrough the following path:3900 Series Base

Station Initial Configuration Guide> 3900

Series Base Station Initial Configuration

(Based on the CME)> Creating Base

Stations> Creating a Single Separate-

MPT Multimode Base Station>

Configuring Device Data> Configuring

the Cabinet and BBU3900

Data, Configuring BBU Interconnection

Links.

GL+U

GU+UL

GU+U

U+U See 3900 Series Base Station InitialConfiguration Guide. Find Procedure

through the following path: 3900 Series Base




Stations> Creating a NodeB> Creating a

Single NodeB> Configuring NodeB Device

Data> Configuring the Cabinet and

BBU3900 Data, Configuring BBU

Interconnection Links.

G*U*L + G*U*L See 3900 Series Base Station InitialConfiguration Guide. Find Procedure

through the following path:3900 Series Base




Stations> Creating a Single Co-MPT Base

Station> Configuring Device Data>

Configuring the Cabinet and BBU3900

Data, Configuring BBU Interconnection

Links.

5.4.4 Activation Observation

After 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 1Check the status of the Mx indicator on the UCIU or the status of the CI indicator on the UMPT

to determine whether CTRLLNK/BTSCTRLLNK is operating correctly.

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

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 End

l On the M2000 maintenance console or the LMT, you can run the LST CTRLLNK/

BTSCTRLLNK command to query the cabinet number, subrack number, slot number, and

port 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 end

of the BBU interconnection signal cable is 0, the mode at this end is deployed in the main subrack. If the

subrack number of thisend is 1, the BBU at the other end is the main subrack.

l Run the MML command DSP CTRLLNKSTAT/BTSCTRLLNKSTAT to check

whether CTRLLNK/BTSCTRLLNK is operating correctly.

l Run the MML command DSP BBPLNK command to check whether BBPLNK is

configured 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 5-4shows the hardware configuration before and after BBU Interconnection

(UCIU+UMPT) is implemented.

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Figure 5-4Hardware 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 signal

cable between the UCIU and

UMPT

1 The cable connects the M

port on the UCIU to the CI

port on the UMPT.

SFP optical modules 2 -

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CPRI cables, transmission

cables, 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 Initial

Configuration Guide. Find Procedurethrough the following path:3900 Series Base Station

Initial Configuration Guide> 3900 Series Base Station Initial Configuration (Based on the

CME)> Creating Base Stations> Creating a Single Separate-MPT Multimode Base

Station> Configuring Device Data> Configuring the Cabinet and BBU3900

Data,Configuring BBU 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. For

parameter settings, see the setting description in Table 5-3.

----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.

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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 the

UCIU to the CI port on the UMPT.

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

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

triple-mode base station

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

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

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Have the following new hardware components ready:


WBBPf 1 -

UMPT 1 -

BBU interconnection signal

cable

1 connects the M port on the

UCIU to the CI port on the

UMPT

Multi-mode SFP optical

modules

2 -

QSFP cables provided by

Huawei

1 connects the HEI port on two

WBBPf boards

l Hardware installation

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

Step 2 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.

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

to the HEI port on the WBBPf in slot 3 in BBU 0.

----End

l Data reconfiguration

For the procedure for reconfiguring data on the CME, see 3900 Series Base Station Initial

Configuration Guide. Find Procedurethrough the following path:3900 Series Base Station

Initial Configuration Guide> 3900 Series Base Station Initial Configuration (Based on the

CME)> Creating Base Stations> Creating a Single Separate-MPT Multimode Base

Station> Configuring Device Data> Configuring the Cabinet and BBU3900 Data,

Configuring BBU Interconnection Links.

The data reconfiguration procedure using MML commands is as follows:

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 5On the UMTS side, run the MML command ADD BBPLNK to add a baseband processing link.

For parameter settings, see the setting description in Table 5-4

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NOTE

Uplink resource groups cannot be configured across BBUs. Downlink resource groups can be configured

across 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 and

slot 2 of BBU0 empty) to GU+UL triple-mode base station




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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 5-4.

----End

NOTE

Uplink resource group cannot be configured across BBUs. Downlink resource groups can be configured


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



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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 BBPLNKto add a baseband processing link.For parameter settings, see the setting description in Table 5-4.

----End

NOTE

Uplink resource group cannot be configured across BBUs. Downlink resource groups can be configured


5.6 Performance Optimization

N/A

5.7 Troubleshooting

Table 5-5lists the alarms related to BBU Interconnection. For details, see the related alarm

reference documents.

Table 5-5Table Alarms related to BBU Interconnection

Alarm ID Alarm Name Alarm Description

26310 Inter-BBU Optical Module

Fault

This alarm is reported when

the optical module on an

inter-BBU port is faulty.


Not in Position



inter-BBU port cannot be

detected or the cable for the

inter-BBU electrical port is

improperly connected. In

UMTS mode, this alarm is

only reported to a 2U BBU.


Receive Failure


the optical link (at the

physical layer) between BBU

ports fails to receive optical

signals. This alarm is only

reported by a 2U BBU.

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Alarm ID Alarm Name Alarm Description


Transmit Failure



inter-BBU port fails totransmit data. This alarm is

only reported by a 2U BBU.

26314 Inter-BBU Port Failure This alarm is reported when

an inter-BBU port fails to

transmit or receive data. In

UMTS mode, this alarm is

reported only by a 2U BBU.

26315 Inter-BBU Port Connection

Error

An inter-BBU interface on

the UCIU can be an M port or

an S port. Inter-BBUinterfaces of the same type

cannot be connected, and a

ring network is not allowed if

inter-BBU interfaces are

connected. This alarm is

reported when inter-BBU

interfaces of the same type

are connected, or a ring

network is set up in the case

of an inter-BBU connection.

26240 BBU Topology andConfiguration Mismatch

This alarm is reported whenthe configured and actual

inter-BBU connection

topologies are inconsistent.

In UMTS mode, this alarm is

only reported to a 2 U BBU.

26274 Inter-System Board Object

Configuration Conflict

In multi-mode configuration,

this alarm is reported when

the cabinet/subrack/slot

configuration of a board is

inconsistent in different

modes, or when the cabinet/subrack/slot configuration of

different boards is the same

in different modes, or when a

board supporting only a

certain mode is configured

for different modes.

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6ParametersTable 6-1UMTS: Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

LN BTS3900 ADD

CTRLLNK

LST CTRLLNK

MOD

CTRLLNK

RMV

CTRLLNK

None None Meaning:Indi-

cates the number

of the control

link at the local

end.

GUI Value

Range:0~255

Unit:None

Actual Value

Range:0~255

Default

Value:None

CN BTS3900 ADD

CABINET

DSP

CABMFRINFO

LST CABINET

MOD

CABINET

RMV

CABINET


cates the cabinet

number.

GUI Value

Range:0~62

Unit:None

Actual Value

Range:0~62

Default

Value:None

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SRN BTS3900 ADD

SUBRACKLST

SUBRACK

MOD

SUBRACK

RMV

SUBRACK


cates the numberof the subrack.

GUI Value

Range:0~254

Unit:None

Actual Value

Range:0~254

Default

Value:None

UPCN BTS3900 ADD

CTRLLNK

LST CTRLLNK


cates the cabinetnumber of the

upper-level

node at the other

end of the

control link.

GUI Value

Range:0~7

Unit:None

Actual Value

Range:0~7Default

Value:None

UPSRN BTS3900 ADD

CTRLLNK

LST CTRLLNK


cates the

subrack number

of the upper-

level node at the

other end of the

control link.

GUI Value

Range:0~1

Unit:None

Actual Value

Range:0~1

Default

Value:None

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UPSN BTS3900 ADD

CTRLLNKMOD

CTRLLNK

LST CTRLLNK


cates the slotnumber of the

upper-level

node at the other

end of the

control link.

GUI Value

Range:0~7

Unit:None

Actual Value

Range:0~7

Default

Value:None

UPPT BTS3900 ADD

CTRLLNK

MOD

CTRLLNK

LST CTRLLNK


cates the port

number of the

upper-level

node at the other

end of the

control

link.Values 0 to

4 indicate theports M0 to M4

on the board

panel.

GUI Value

Range:0~4

Unit:None

Actual Value

Range:0~4

Default

Value:None

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LN BTS3900 ADD BBPLNK

LST BBPLNK

MOD BBPLNK

RMV BBPLNK


cates the numberof the

interconnection

link.

GUI Value

Range:0~255

Unit:None

Actual Value

Range:0~255

Default

Value:None

HCN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the cabinet

number of the

head node at one

end of the

interconnection

link.

GUI Value

Range:0~7

Unit:None

Actual Value

Range:0~7

Default

Value:None

HSRN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the

subrack number

of the head node

at one end of the

interconnection

link.

GUI Value

Range:0~1

Unit:None

Actual Value

Range:0~1

Default

Value:None

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HSN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the slotnumber of the

head node at one

end of the

interconnection

link.

GUI Value

Range:2~3

Unit:None

Actual Value

Range:2~3

Default

Value:None

HPN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the port

number of the

head node at the

other end of the

interconnection

link. This port

indicates the

port HEI on theboard panel.

GUI Value

Range:6

Unit:None

Actual Value

Range:6

Default Value:6

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TCN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the cabinetnumber of the

tail node at one

end of the

interconnection

link.

GUI Value

Range:0~7

Unit:None

Actual Value

Range:0~7

Default

Value:None

TSRN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the

subrack number

of the tail node at

one end of the

interconnection

link.

GUI Value

Range:0~1

Unit:None

Actual Value

Range:0~1

Default

Value:None

TSN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the slot

number of the

tail node at one

end of the

interconnection

link.

GUI Value

Range:2~3

Unit:None

Actual Value

Range:2~3

Default

Value:None

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TPN BTS3900 ADD BBPLNK

MOD BBPLNK

LST BBPLNK


cates the portnumber of the

tail node at one

end of the

interconnection

link. This port

indicates the

port HEI on the

board panel.

GUI Value

Range:6

Unit:NoneActual Value

Range:6

Default Value:6

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7CountersThere are no specific counters associated with this feature.

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8Reference Documents1. Common Transmission Feature Parameter Description

2. Common Clock Feature Parameter Description

3. MML Command Reference

4. Parameter Reference

5. MO Reference

6. Alarm Reference

7. 3900 Series Base Stations Initial Configuration

8. 3900 Series Base Station Technical Description

9. 3900 Series Base Station Commissioning Guide

10. Hardware descriptions of the relevant base stations11. 3900 Series Base Station Initial Configuration Guide

12. RF Unit and Topology Management

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