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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]
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Copyright Huawei Technologies Co., Ltd.
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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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BBU Interconnection Feature Parameter Description Contents
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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.
Change Type Change Description Parameter Change
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.
Change Type Change Description Parameter Change
Feature change None None
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Change Type Change Description Parameter Change
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
GUI value range: 0 to
7
Network plan
Local Subrack No. SRN Subrack number of
BBU 1
GUI value range: 0 to
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
GUI value range: 0 to
7
Network plan
Upper Subrack No. UPSRN Subrack number of
BBU 0
GUI value range: 0 to
1
Network plan
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Parameter Name Parameter ID Setting Notes Data Source
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
GUI value range: 0 to
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
SingleRAN8.0.
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Table 5-4Parameters for BBPLNK
Parameter Name Parameter ID Setting Notes Data Source
Link No. LN Number of BBPLNK
GUI value range: 0 to
255
Recommended
value: 0
Network plan
Head Cabinet No. HCN Cabinet number of
the link head
GUI value range: 0 to
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
GUI value range: 2 to
3
Network plan
Head Port No. HPN Default value: 6 Network plan
Tail Cabinet No. TCN Cabinet number of
the link tail
GUI value range: 0 to
7
Network plan
Tail Subrack No. TSRN Subrack number of
the link end
GUI value range: 0 to
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
Station Initial Configuration Guide> 3900
Series Base Station Initial Configuration
(Based on the CME)> Creating 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
Station Initial Configuration Guide> 3900
Series Base Station Initial Configuration
(Based on the CME)> Creating 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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Hardware Component Quantity Remarks
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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l New hardware components
Have the following new hardware components ready:
Hardware Component Quantity Remarks
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 4 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.
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
Figure 5-6shows the hardware before and after BBU Interconnection.
Figure 5-6Hardware changes for UMTS baseband capacity expansion (scenario 2)
l New hardware components
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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
across 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 5-7shows the hardware before and after BBU Interconnection.
Figure 5-7Hardware changes for UMTS baseband capacity expansion (scenario 3)
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Step 4 On the UMTS side, run the MML command ADD BRD to add a WBBPd for BBU 1.
Step 5 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.
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
across BBUs. The number of resource groups depends on the actual planning for each site.
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.
26311 Inter-BBU Optical Module
Not in Position
This alarm is reported when
the optical module on an
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.
26312 Inter-BBU Optical Module
Receive Failure
This alarm is reported when
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
26313 Inter-BBU Optical Module
Transmit Failure
This alarm is reported when
the optical module on an
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
None None Meaning:Indi-
cates the cabinet
number.
GUI Value
Range:0~62
Unit:None
Actual Value
Range:0~62
Default
Value:None
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Parameter ID NE MMLCommand
Feature ID Feature Name Description
SRN BTS3900 ADD
SUBRACKLST
SUBRACK
MOD
SUBRACK
RMV
SUBRACK
None None Meaning:Indi-
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
None None Meaning:Indi-
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
None None Meaning:Indi-
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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Parameter ID NE MMLCommand
Feature ID Feature Name Description
UPSN BTS3900 ADD
CTRLLNKMOD
CTRLLNK
LST CTRLLNK
None None Meaning:Indi-
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
None None Meaning:Indi-
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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Parameter ID NE MMLCommand
Feature ID Feature Name Description
LN BTS3900 ADD BBPLNK
LST BBPLNK
MOD BBPLNK
RMV BBPLNK
None None Meaning:Indi-
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
None None Meaning:Indi-
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
None None Meaning:Indi-
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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Parameter ID NE MMLCommand
Feature ID Feature Name Description
HSN BTS3900 ADD BBPLNK
MOD BBPLNK
LST BBPLNK
None None Meaning:Indi-
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
None None Meaning:Indi-
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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Parameter ID NE MMLCommand
Feature ID Feature Name Description
TCN BTS3900 ADD BBPLNK
MOD BBPLNK
LST BBPLNK
None None Meaning:Indi-
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
None None Meaning:Indi-
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
None None Meaning:Indi-
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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BBU Interconnection Feature Parameter Description 6 Parameters
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Parameter ID NE MMLCommand
Feature ID Feature Name Description
TPN BTS3900 ADD BBPLNK
MOD BBPLNK
LST BBPLNK
None None Meaning:Indi-
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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BBU Interconnection Feature Parameter Description 6 Parameters
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7CountersThere are no specific counters associated with this feature.
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BBU Interconnection Feature Parameter Description 7 Counters
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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
SingleRAN
BBU Interconnection Feature Parameter Description 8 Reference Documents