BBU Interconnection(SRAN8.0_Draft a)

SingleRAN SRAN8.0

BBU Interconnection Feature Parameter Description Issue

Draft A

Date

2013-01-15

HUAWEI TECHNOLOGIES CO., LTD.

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 Draft A (2013-01-15)

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

i

SingleRAN BBU Interconnection Feature Parameter Description

Contents

Contents 1 About This Document..................................................................................................................1 1.1 Scope..................................................................................................................................................................1 1.2 Intended Audience..............................................................................................................................................1 1.3 Change History...................................................................................................................................................1

2 Overview.........................................................................................................................................3 2.1 Introduction........................................................................................................................................................3 2.2 Upgrade to Triple-Mode Base Stations..............................................................................................................3 2.2.1 Cable Connections.....................................................................................................................................3 2.2.2 Application Scenarios................................................................................................................................4 2.2.3 Restrictions................................................................................................................................................5 2.2.4 Supported Features and Functions.............................................................................................................6 2.3 UMTS Baseband Capacity Expansion...............................................................................................................6 2.3.1 Cable Connections.....................................................................................................................................6 2.3.2 Application Scenarios................................................................................................................................7 2.3.3 Restrictions................................................................................................................................................9

3 Related Features...........................................................................................................................10 4 Impact on the Network...............................................................................................................11 4.1 Impact on System Capacity..............................................................................................................................11 4.2 Impact on Network Performance......................................................................................................................11

5 Engineering Guidelines.............................................................................................................12 5.1 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......................................................................................................................................................18 5.4 Feature Deployment.........................................................................................................................................18 5.4.1 Deployment Requirements......................................................................................................................18 5.4.2 Data Preparation......................................................................................................................................18 5.4.3 Initial Configuration................................................................................................................................22 Issue Draft A (2013-01-15)


ii


Contents

5.4.4 Activation Observation............................................................................................................................22 5.4.5 Adjustment...............................................................................................................................................23 5.5 Performance Optimization................................................................................................................................31 5.6 Troubleshooting................................................................................................................................................31

6 Reference Documents.................................................................................................................33



iii


1 About This Document

1

About 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: l

Personnel who need to understand BBU Interconnection

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: refers to a change in the BBU Interconnection feature of a specific product version.

l

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.



1


1 About This Document

Document Issues The document issues is as follows: l

Draft A (2013-01-15)

Draft A (2013-01-15) This was a draft. Compared with 04 (2012-12-10) in SRAN7.0, Draft A (2013-01-15) in SRAN8.0 incorporates the changes described in thefollowing table. Change Type

Change Description

Parameter Change

Feature change

None

None

Editorial change

In sections "2.2.3 Restrictions" and "2.3.3 Restrictions":

None

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.



2


2 Overview

2

Overview

2.1 Introduction BBU Interconnection is implemented after a BBU interconnection signal cable connects two BBUs and the related data configuration takes effect. This feature is applicable to the following scenarios: l

Upgrade to triple-mode base stations Triple-mode base station can support GSM, UMTS, and LTE. NOTE

This document assumes that LTE uses frequency division duplex (FDD).

l

UMTS baseband capacity expansion A BBU supports a maximum of six WBBPs. After BBU Interconnection is enabled, a maximum of 11 WBBPs are supported, enhancing the baseband capacity of base stations. SRAN8.0 supports only UMTS baseband interconnection.

2.2 Upgrade to Triple-Mode Base Stations 2.2.1 Cable Connections One port from ports M0 through M4 on the UCIU of BBU0 is connected to the CI port on the UMPT of BBU1 to implement BBU interconnection. Ports M0 through M4 are prioritized from the lowest to the highest. Figure 2-1 shows the cables connections for an upgrade to a triplemode base station.



3


2 Overview

Figure 2-1 Cables connections for an upgrade to a triple-mode base station (port M0 is used here as an example)

In Figure 2-1, BBU0 is the root BBU and BBU1 is the leaf BBU. BBU1 provides the CI port for the BBU interconnection signal cable. The BBU interconnection signal cable is logically called CTRLLNK for the NodeB or eNodeB, and is logically called BTSCTRLLNK for the GBTS . During data configuration, BBU1 is by default the local node and BBU0 is the upperlevel node. A maximum of two CTRLLNKs for the NodeB or eNodeB, and two BTSCTRLLNKs for the GBTS are supported. NOTE

In this document, the BBU interconnection signal cable on the NodeB or eNodeB side is logically called CTRLLNK and logically called BTSCTRLLNK on the GBTS side.

2.2.2 Application Scenarios Table 2-1 lists the application scenarios of triple-mode base stations. Table 2-1 Application scenarios of triple-mode base stations Mode

BBU0 Mode

BBU1 Mode

BBU Hardware Configuration

GU+L

GU

L

Figure 2-2

GL+U

GL

U

Figure 2-3

NOTE

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



4


2 Overview

Figure 2-2 BBU3900 hardware configuration in (GU+L) mode

Figure 2-3 BBU3900 hardware configuration in (GL+U) mode

NOTE

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.

2.2.3 Restrictions When upgrading a base station to a triple-mode base station, pay attention to the following restrictions: l

GSM must be deployed on BBU0.

l

The UCIU can be installed in any of BBU 0's slots 4, 5, 0, and 1, which are arranged in descending order of priority.



5


2 Overview

l

A UMPT connecting the BBU interconnection signal cable must be installed in BBU1.

l

Monitoring devices must be connected to BBU0.

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.

2.2.4 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.

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 2-4 shows an example of inter-BBU SDR, wherein BBU0 supports GSM, BBU1 supports LTE, and the GL RXU is connected to BBU0 and BBU1. Figure 2-4 Inter-BBU SDR

2.3 UMTS Baseband Capacity Expansion 2.3.1 Cable Connections Figure 2-5 shows the cable connections for UMTS baseband capacity expansion. Both BBU0 and BBU1 support UMTS. To implement BBU Interconnection, one port from ports M0 through M4 on the UCIU of BBU0 is connected to the CI port on the UMPT of BBU1, and the WBBPs on both BBUs are connected through another BBU interconnection signal cable. Although there are a variety of UMTS baseband boards, only the WBBPf provides the HEI port for UMTS baseband interconnection. Issue Draft A (2013-01-15)


6


2 Overview

Figure 2-5 Cables connections for UMTS baseband capacity expansion

The BBU interconnection signal cable (cable 1) between the UCIU and UMPT is logically called CTRLLNK for the NodeB or eNodeB, and is logically called BTSCTRLLNK for the GBTS. BBU interconnection allows transfer of operation and maintenance (O&M) information, service information (signaling and user data) and clock synchronization information between interconnected BBUs. During data configuration, BBU1 is by default the local node and BBU0 is the upper-level node. A maximum of two CTRLLNKs for the NodeB or eNodeB, and two BTSCTRLLNKs for the GBTS are supported. The BBU interconnection signal cable (cable 2) between the WBBPf boards is logically BBPLNK. BBU interconnection allows transfer of baseband data between interconnected BBUs and baseband resource extension. During data configuration, either end of BBPLNK can be the link head, but the link head on the BBU0 end is recommended. Only one BBPLNK is supported in SRAN8.0. The two BBU interconnection signal cables have different exteriors and connectors and therefore the cables are not interchangeable. The BBPLINK must be established before the CTRLLNK for the NodeB or eNodeB, and BTSCTRLLNK for the GBTS. For details, see the hardware descriptions of the relevant base stations.

2.3.2 Application Scenarios Table 2-2 lists the application scenarios of UMTS baseband capacity expansion. Table 2-2 Application scenarios of UMTS baseband capacity expansion Mode

BBU0 Mode

BBU1 Mode

BBU Hardware Configuration

GU+UL

GU

UL

Figure 2-6

GU+U

GU

U

Figure 2-7

U+U

U

U

Figure 2-8



7


2 Overview

Figure 2-6 BBU3900 hardware configuration in (GU+UL) mode

Figure 2-7 BBU3900 hardware configuration in (GU+U) mode

Figure 2-8 BBU3900 hardware configuration in (U+U) mode



8


2 Overview

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

2.3.3 Restrictions Both BBU0 and BBU1 must be configured with one UMTS main control board to expand the UMTS baseband processing capability, with the UMTS main control board in BBU0 as primary and that in BBU1 as secondary. When the main control board is running properly, the ACT LED on the main control board indicates the working mode. If the ACT LED is ON, the main control board is primary. If the ACT LED is OFF, the main control board is secondary. The following local operations can only be performed on the primary main control board: l

Software upgrade and data configuration using a USB storage device

l

Local LMT operations

l

Clock performance monitoring

l

Voltage Standing Wave Ratio (VSWR) test using a USB storage device

In addition, BBU interconnection for baseband capacity expansion has the following restrictions: l

The WBBPf for baseband interconnection can only be installed in slot 2 or slot 3 of either BBU. Slot 3 is preferred.

l

The UCIU can be installed in any of BBU 0's slots 4, 5, 0, and 1, which are arranged in descending order of priority.

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 sharing is supported only in the downlink.

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 BBU0. For details about CPRI cable connections, see the hardware descriptions of the relevant base stations.

l

BBU interconnection does not enable two NodeBs to be upgraded to one NodeB.

l

Monitoring devices must be connected to BBU0.

l

A UMPT connecting the BBU interconnection signal cable must be installed in BBU1.

l

In a NodeB deployed by using the plug-and-play function, a UMPT working in UMTS mode must be configured in BBU0.

l

Inter-BBU multiple-input multiple-output (MIMO) is not supported. The main and diversity RRUs serving MIMO cells must be configured on the same BBU.

l

RRUs serving multi-RRU cells, distributed cells, or two cells in a DC-HSUPA or DCHSDPA group must be configured for the same BBU.

l

The secondary UMTS main control board in BBU1 does not support co-transmission.



9


3 Related Features

3

Related Features

The following features depend on BBU Interconnection: l

MRFD-211501 IP-Based Multi-mode Co-Transmission on BS side(GBTS)

l

MRFD-221501 IP-Based Multi-mode Co-Transmission on BS side(NodeB)

l

MRFD-231501 IP-Based Multi-mode Co-Transmission on BS side(eNodeB)

l

MRFD-211601 Multi-mode BS Common Reference Clock(GBTS)

l

MRFD-221601 Multi-mode BS Common Reference Clock(NodeB)

l

MRFD-231601 Multi-mode BS Common Reference Clock(eNodeB)



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4

4 Impact on the Network

Impact on the Network

4.1 Impact on System Capacity Upgrading a base station to a triple-mode base station does not affect system capacity. One Multimode base station supports a maximum of 11 WBBPs. For details about the WBBP capacity specifications, see the hardware descriptions of the relevant base stations. For details about capacity specifications after baseband capacity expansion, see the 3900 Series Base Station Technical Description.

4.2 Impact on Network Performance No impact.



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5

5 Engineering Guidelines

Engineering 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 SRAN7.0 or later.

5.3.2 Subracks and Hardware Configurations for the BBUs Before deploying a new Multimode base station, see the hardware descriptions of the relevant base stations for the installation positions of BBU0 and BBU1. After determining the installation positions of BBU0 and BBU1, see section "2.2.2 Application Scenarios" and section "2.3.2 Application Scenarios" for BBU hardware configurations. If you intend to expand the capacity for a base station, see the relevant capacity expansion documents or configure the base station as a new one. You are advised to configure the existing BBU as BBU0 to minimize the impact on ongoing services. Issue Draft A (2013-01-15)


12



The UCIU can be controlled by only one mode. Otherwise, ALM-26274 Inter-System Board Object Configuration Conflict is reported. UCIU-related alarms are reported only to the mode 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 5-1 lists the mode recommended for controlling the UCIU in each scenario. Table 5-1 Mode recommended for controlling the UCIU in each scenario Mode

BBU0 Mode

BBU1 Mode

Mode Recommended for Controlling the UCIU

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

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, the base station supports: l

Independent transmission

l

Inter-BBU co-transmission

Independent Transmission In a triple-mode base station, each mode is connected to the transport network through its own port. If you intend to expand the UMTS baseband processing capability, configure one UMTS main control board for BBU0 and BBU1 each. Either BBU can be connected to the RNC through the Iub interface. It is recommended that BBU0 be connected to the RNC. Issue Draft A (2013-01-15)


13



Inter-BBU Co-Transmission An Multimode base station supports the following co-transmission modes to implement interBBU co-transmission: l

UMPT-based co-transmission through backplane interconnection All the 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 an 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 the 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.

In new Multimode base station deployment scenarios, the UTRPc has the following configuration restrictions: l

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

l

When the UMTS baseband processing capability is to be expanded, UMTS is not allowed to control the UTRPc if the UTRPc is installed in BBU1.

l

When an Multimode base station is to be deployed, the mode priority descends from LTE, to UMTS, and then to GSM. By default, the UTRPc is controlled by UMTS before delivery.

l

When deploying an Multimode base station, first deploy the mode controlling the UTRPc. Otherwise, other modes cannot be deployed.

Table 5-2 lists the mode recommended for controlling the UTRPc and the related mode deployment order when an Multimode base station works in different modes.



14



Table 5-2 Mode recommended for controlling the UTRPc and related mode deployment order when the Multimode base station works in different modes UTRPc Installed in...

Mode

BBU0 Mode

BBU1 Mode

Mode Recomm ended for Controlli ng the UTRPc

Mode Deploym 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 configurat ion file.

GL+U

GL

U

L

LTE > GSM = UMTS

N/A

GU+UL

GU

UL


UMTS > GSM = LTE

N/A

GU+U

GU

U


UMTS > GSM

N/A

U+U

U

U


N/A

N/A

GU+L

GU

L

L

LTE > GSM = UMTS

N/A

GL+U

GL

U

U

UMTS > GSM = LTE

N/A

BBU1



15


UTRPc Installed in...


Mode

BBU0 Mode

BBU1 Mode

Mode Recomm ended for Controlli ng the UTRPc

Mode Deploym ent 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

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. Figure 5-1 Ring topology not supported between two BBUs



16



With Multi-Mode RF Modules If multi-mode RF modules are configured, a dual-star topology must be used to achieve interBBU SDR. Figure 5-2 and Figure 5-3 show two dual-star topology examples with GU RFUs and GU RRUs, respectively. Figure 5-2 Dual-star topology with GU RFUs

Figure 5-3 Dual-star topology with GU RRUs



17



NOTE

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

5.3.5 Clocks With BBU Interconnection, the base station uses one of the following clocks: l

Independent reference clock

l

Common reference clock

Independent Reference Clock In triple-mode base station scenarios, the reference clock configuration for each mode is the same as the clock configuration for a single-mode base station. For UMTS baseband expansion, BBU0 and BBU1 each have their own UMTS board. The reference clock can be configured in either BBU.

Common Reference Clock The reference clock can be configured in either BBU0 or BBU1. The BBU configured with the reference clock shares control data and clock signals with the other BBU through a BBU interconnection signal cable and the BBU backplane. For details about the engineering guide to common reference clock, see the Common Clock Feature 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 ----End The control link is logically CTRLLNK for NodeB or eNodeB, and BTSCTRLLNK for GBTS. Issue Draft A (2013-01-15)


18



Physically, the control link is the BBU interconnection signal cable between the UCIU and UMPT. 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 5-3 Parameters for CTRLLNK and BTSCTRLLNK Parameter Name

Parameter ID

Setting Description

Source

Local Link No.

LN

Number of CTRLLNK/ BTSCTRLLNK

Network plan

GUI value range: 0 to 255 Recommended value: 0, 1 Local Cabinet No.

CN

Cabinet number of BBU1

Network plan

GUI value range: 0 to 7 Local Subrack No.

SRN

Subrack number of BBU1

Network plan

GUI value range: 0 to 1 Local Slot No.

SN

Slot number of the BBU1 UMPT connected to the BBU interconnection signal cable

Network plan

If BBU Interconnection is applied, set this parameter to 6 or 7, depending on site conditions. Upper Cabinet No.

UPCN

Cabinet number of BBU0

Network plan

GUI value range: 0 to 7



19



Parameter Name

Parameter ID

Setting Description

Source

Upper Subrack No.

UPSRN

Subrack number of BBU0

Network plan

GUI value range: 0 to 1 Upper Slot No.

UPSN

Slot number of the BBU0 UCIU connected to the BBU interconnection signal cable

Network plan

If BBU Interconnection is applied, set this parameter to 4 or 0, depending on site conditions. Upper Port No.

UPPT

Port number of the BBU0 UCIU connected to the BBU interconnection signal cable

Network plan

GUI value range: 0 to 4

UMTS Baseband Capacity Expansion 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. For details, see 2.2 Upgrade to Triple-Mode Base Stations. Step 3 Plan the baseband processing link. ----End ----End The baseband processing link is logically BBPLNK. Physically, the baseband processing link is the BBU interconnection signal cable between the WBBPf boards.



20



The two ends of the BBPLNK must be designated. Either end of BBPLNK can be the link head, but the link head on the BBU0 end is recommended. 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 SRAN8.0. Table 5-4 Parameters for BBPLNK Parameter Name

Parameter ID

Setting Description

Source

Link NO.

LN

Number of BBPLNK

Network plan

GUI value range: 0 to 255 Recommended value: 0 Head Cabinet No.

HCN

Cabinet number of the link head

Network plan

GUI value range: 0 to 7 Head Subrack No.

HSRN

Subrack number of the link head

Network plan

GUI value range: 0 to 1 Head Slot No.

HSN

Slot number of the link head

Network plan

GUI value range: 2 to 3 Head Port No.

HPN

Default value: 6

Network plan

Tail Cabinet No.

TCN

Cabinet number of the link tail

Network plan

GUI value range: 0 to 7 Tail Subrack No.

TSRN

Subrack number of the link tail

Network plan

GUI value range: 0 to 1 Tail Slot No.

TSN

Slot number of the link tail

Network plan

GUI value range: 2 to 3 Tail Port No.


TPN

Default value: 6


Network plan

21



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 procedures. Table 5-5 References for initial configuration procedure Mode

Reference for Initial Configuration Procedure

GU+L

See the 3900 Series Base Station Initial Configuration 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 Multimode Base Stations > Creating a Single Separate-MPT Multimode Base Station > Configuring Device Data > Configuring BBU Interconnection Links.

GL+U GU+UL GU+U

U+U

See the 3900 Series Base Station Initial Configuration 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 a NodeB > Creating a Single NodeB > Configuring NodeB Device Data > Configuring BBU Interconnection Links.

5.4.4 Activation Observation l

On the near end

Step 1 Check the status of the Mx indicator on the UCIU or the status of the CI indicator on the UMPT to determine whether a CTRLLNK/BTSCTRLLNK is operating properly. l If the Mx indicator is green, the CTRLLNK/BTSCTRLLNK is operating properly. l If the CI indicator is green, the CTRLLNK/BTSCTRLLNK is operating properly. Step 2 Check the status of the HEI indicator on the WBBPf to determine whether a BBPLNK is operating properly. l If the HEI indicator is green, the BBPLNK is operating properly. ----End NOTE

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

----End l

On the remote end



22



Step 1 On the M2000 device panel, check whether the CTRLLNK/BTSCTRLLNK is configured as planned. l Check whether the cabinet, subrack, slot, and port numbers of the CTRLLNK/ BTSCTRLLNK are configured as planned. l Check whether the status of the CTRLLNK/BTSCTRLLNK is normal. Step 2 Run the DSP CTRLLNKSTAT/BTSCTRLLNKSTAT command to check whether the CTRLLNK/BTSCTRLLNK is normal. Step 3 Run the DSP BBPLNK command to check whether the BBPLNK is configured as planned. Step 4 Check whether any alarms related to BBU Interconnection were reported. For details, see section "5.6 Troubleshooting." For details about how to clear the alarms, see related alarm reference documents. ----End ----End

5.4.5 Adjustment After deployment, base stations may be adjusted for: l

Upgrade to triple-mode base stations

l

UMTS baseband capacity expansion

Upgrade to Triple-Mode Base Stations The following is an example of an upgrade from a GU dual-mode base station to a GU+L triplemode base station. Figure 5-4 shows the hardware before and after BBU Interconnection.



23



Figure 5-4 Hardware changes for upgrade from a GU dual-mode base station to a GU+L triple-mode base station

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

1

The cable connects the M port on the UCIU to the CI port on the UMPT.

Multi-mode SFP optical modules

2

-

Other cables

Depending on the site plan

-

l

Hardware installation

Step 1 Install the UMPT and LBBP in BBU1. Connect the power cable, monitoring cable, transmission cable, clock signal cable, and CPRI fiber optic cable to the boards. Issue Draft A (2013-01-15)


24



Step 2 Install the UCIU in BBU0. Step 3 Link one end of a BBU interconnection signal cable to the M0 port in UCIU and the other end to the CI port in UMPT. ----End ----End l

Data reconfiguration

Step 1 On the UMTS and LTE sides, run the ADD CTRLLNK command to add a control link. On the GSM side, run the ADD BTSCTRLLNK command to add a control link. For parameter settings, see the setting description in Table 5-3. Step 2 On the GSM side, run the ADD BTSBRD command to add the UCIU for BBU0. Step 3 On the LTE side, run the ADD CABINET command to add a cabinet for BBU1. Step 4 On the LTE side, run the ADD SUBRACK command to add a subrack for BBU1. Step 5 On the LTE side, run the ADD BRD command to add the UMPT for BBU1. Step 6 On the LTE side, run the ADD BRD command to add the LBBP for BBU1. ----End ----End

UMTS Baseband Capacity Expansion Perform the following steps to expand UMTS baseband capacity: Step 1 Add a control link for each mode. Step 2 Add a subrack to BBU1. Step 3 Add a baseband processing link between BBU0 and BBU1. ----End ----End l

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

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



25



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

l



Quantity

Remarks

WBBPf

1

-

UMPT

1

-


1

connects the M port on the UCIU to the CI port on the UMPT


2

-

QSFP cables provided by Huawei

1

connects the HEI port on two WBBPf boards

l


Step 1 Install the UMPT and WBBPf in BBU1. Issue Draft A (2013-01-15)


26



Step 2 Link one end of the BBU interconnection signal cable to the CI port in UMPT and the other end to the M1 port in UCIU. Step 3 Link one end of the QSFP cables to the HEI port in the WBBPf in slot 2 of BBU1 and the other end to the HEI port in the WBBPf in slot 3 of BBU0. ----End ----End l


Step 1 On the UMTS and LTE sides, run the ADD CTRLLNK command to add a control link. On the GSM side, run the ADD BTSCTRLLNK command to add a control link. For parameter settings, see the setting description in Table 5-3. Step 2 On the UMTS side, run the ADD SUBRACK command to add a subrack for BBU1. Step 3 On the UMTS side, run the ADD BRD command to add the UMPT for BBU1. Step 4 On the UMTS side, run the ADD BRD command to add the WBBPf for BBU1. Step 5 On the UMTS side, run the ADD BBPLNK command 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.

----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 5-6 shows the hardware before and after BBU Interconnection.



27




l



Quantity

Remarks

WBBPf

2

-

UMPT

1

-


1



2

-


1


l


Step 1 Install the UMPT and WBBPf in BBU1. Step 2 Install the WBBPf in slot 2 of BBU0. Issue Draft A (2013-01-15)


28



Step 3 Link one end of the BBU interconnection signal cable to the CI port in UMPT and the other end to the M1 port in UCIU. Step 4 Link one end of the QSFP cables to the HEI port in the WBBPf in slot 2 of BBU1 and the other end to the HEI port in the WBBPf in slot 2 of BBU0. ----End ----End l


Step 1 On the UMTS and LTE sides, run the ADD CTRLLNK command to add a control link. On the GSM side, run the ADD BTSCTRLLNK command to add a control link. For parameter settings, see the setting description in Table 5-3 Step 2 On the UMTS side, run the ADD BRD command to add the WBBPf for BBU0. Step 3 On the UMTS side, run the ADD SUBRACK command to add a subrack for BBU1. Step 4 On the UMTS side, run the ADD BRD command to add the UMPT for BBU1. Step 5 On the UMTS side, run the ADD BRD command to add the WBBPf for BBU1. Step 6 On the UMTS side, run the ADD BBPLNK command to add a baseband processing link. For parameter settings, see the setting description in Table 5-4. ----End NOTE


----End 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.



29




l



Quantity

Remarks

WBBPf

2

-

UMPT

1

-


1



2

-


1


l


Step 1 Install the UMPT and WBBPf in BBU1.



30



Step 2 Disconnect the CPRI fiber optic cable from the WBBPd in slot 3 of BBU0. Remove the WBBPd from slot 3 of BBU0 and install it in slot 0 of BBU1. Step 3 Install the WBBPf in slot 3 of BBU0. Step 4 Link the CPRI fiber optic cable disconnected in Step 2 to the WBBPf in slot 3 of BBU0. Step 5 Link one end of the BBU interconnection signal cable to the CI port in UMPT and the other end to the M1 port in UCIU. Step 6 Link one end of the QSFP cables to the HEI port in the WBBPf in slot 2 of BBU1 and the other end to the HEI port in the WBBPf in slot 3 of BBU0. ----End ----End l


Step 1 On the UMTS and LTE sides, run the ADD CTRLLNK command to add a control link. On the GSM side, run the ADD BTSCTRLLNK command to add a control link. For parameter settings, see the setting description in Table 5-3. Step 2 On the UMTS side, run the ADD SUBRACK command to add a subrack for BBU1. Step 3 On the UMTS side, run the ADD BRD command to add the UMPT for BBU1. Step 4 On the UMTS side, run the ADD BRD command to add the WBBPf for BBU1. Step 5 On the UMTS side, run the ADD BRD command to add the WBBPd for BBU1. Step 6 On the UMTS side, run the ADD BBPLNK command to add a baseband processing link. For parameter settings, see the setting description in Table 5-4. ----End NOTE


----End

5.5 Performance Optimization N/A

5.6 Troubleshooting Table 5-6 lists the alarms related to BBU Interconnection. For details, see the related alarm reference documents. Table 5-6 Alarms related to BBU Interconnection Alarm ID

Alarm Name

26310

Inter-BBU Optical Module Fault



31



Alarm ID

Alarm Name

26311

Inter-BBU Optical Module Not in Position

26312

Inter-BBU Optical Module Receive Failure

26313

Inter-BBU Optical Module Transmit Failure

26314

Inter-BBU Port Failure

26315

Inter-BBU Port Connection Error

26240

BBU Topology and Configuration Mismatch

26274

Inter-System Board Object Configuration Conflict



32


6 Reference Documents

6

Reference Documents

1.

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 stations 11. 3900 Series Base Station Initial Configuration Guide 12. RF Unit and Topology Management



33

BBU Interconnection(SRAN8.0_Draft a)

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