RF Unit and Topology Management(SRAN8.0_Draft B)

8/19/2019 RF Unit and Topology Management(SRAN8.0_Draft B)

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SRAN8.0

RF Unit and Topology Management

Issue Draft B

Date 2013-02-08

HUAWEI TECHNOLOGIES CO., LTD.


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

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

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

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

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

Notice

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

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

purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representations

of any kind, either express or implied.

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

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

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

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue Draft B (2013-02-08) Huawei Proprietary and Confidential

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.........................................................................................................................................3

2.1 Introduction to RF Modules...............................................................................................................................3

2.2 Introduction to RRU/RFU Topologies...............................................................................................................3

3 RRU/RFU Modules........................................................................................................................4

3.1 Overview............................................................................................................................................................4

3.2 RRU/RFU Modules in GSM Mode....................................................................................................................4

3.3 RRU/RFU Modules in UMTS Mode..................................................................................................................6

3.4 RRU/RFU Modules in LTE Mode.....................................................................................................................8

3.5 RRU/RFU Modules in Multimode Scenarios...................................................................................................12

4 RRU/RFU Topologies.................................................................................................................13

4.1 Star Topology...................................................................................................................................................14

4.2 Chain Topology................................................................................................................................................14

4.3 Ring Topology..................................................................................................................................................15

4.3.1 Cold-Backup Ring Topology on One Baseband Signal Processing Board or Interface Board...............16

4.3.2 Cold-Backup Ring Topology Between Two Baseband Signal Processing Boards.................................17

4.3.3 Hot-Backup Ring Topology....................................................................................................................18

4.3.4 Intra-Board Load-Sharing Ring Topology..............................................................................................19

4.3.5 Inter-Board Load-Sharing Ring Topology..............................................................................................204.4 Dual-Star Topology..........................................................................................................................................21

5 Related Features...........................................................................................................................23

6 Network Impact...........................................................................................................................24

7 Engineering Guidelines (GSM_GBTS)...................................................................................25

7.1 When to Use RF Unit and Topology Management..........................................................................................25

7.2 Required Information.......................................................................................................................................25

7.3 Network Planning.............................................................................................................................................25

7.4 Deployment......................................................................................................................................................25

7.4.1 Requirements...........................................................................................................................................25

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7.4.2 Data Preparation......................................................................................................................................25

7.4.3 Precautions...............................................................................................................................................30

7.4.4 Initial Configuration................................................................................................................................31

7.4.5 Activation Observation............................................................................................................................31

7.4.6 Reconfiguration.......................................................................................................................................32

7.5 Performance Optimization................................................................................................................................34

7.6 Troubleshooting................................................................................................................................................34

8 Engineering Guidelines (GSM_eGBTS).................................................................................37




8.4 Deployment......................................................................................................................................................37

8.4.1 Requirements...........................................................................................................................................37


8.4.3 Precautions...............................................................................................................................................43






9 Engineering Guidelines (UMTS).............................................................................................49




9.4 Deployment......................................................................................................................................................49

9.4.1 Requirements...........................................................................................................................................49


9.4.3 Precautions...............................................................................................................................................56






10 Engineering Guidelines (LTE)................................................................................................62

10.1 When to Use RF Unit and Topology Management........................................................................................62

10.2 Required Information.....................................................................................................................................62

10.3 Network Planning...........................................................................................................................................62

10.4 Deployment....................................................................................................................................................62

10.4.1 Requirements.........................................................................................................................................62

10.4.2 Data Preparation....................................................................................................................................63

10.4.3 Precautions.............................................................................................................................................72

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10.4.4 Initial Configuration..............................................................................................................................72

10.4.5 Activation Observation..........................................................................................................................72

10.4.6 Reconfiguration.....................................................................................................................................73

10.5 Performance Optimization..............................................................................................................................74

10.6 Troubleshooting..............................................................................................................................................74

11 Engineering Guidelines (Dual Modes).................................................................................76

11.1 When to Use RF Unit and Topology Management........................................................................................76

11.2 Required Information.....................................................................................................................................76

11.3 Network Planning...........................................................................................................................................76

11.4 Deployment....................................................................................................................................................76

11.4.1 Requirements.........................................................................................................................................76

11.4.2 Data Preparation....................................................................................................................................76

11.4.3 Precautions.............................................................................................................................................81

11.4.4 Initial Configuration..............................................................................................................................81

11.4.5 Activation Observation..........................................................................................................................82

11.4.6 Reconfiguration.....................................................................................................................................82

11.5 Performance Optimization..............................................................................................................................83

11.6 Troubleshooting..............................................................................................................................................83

12 Reference Documents...............................................................................................................84

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Figures

Figure 4-1 Star topology for RRUs/RFUs.............................................................................................................14

Figure 4-2 Chain topology for RRUs/RFUs..........................................................................................................15

Figure 4-3 GSM ring topology..............................................................................................................................16

Figure 4-4 Cold-backup ring topology on one baseband signal processing board or interface board..................17

Figure 4-5 Cold-backup ring topology between two baseband signal processing boards.....................................18

Figure 4-6 Hot-backup ring topology....................................................................................................................19

Figure 4-7 Intra-board load-sharing ring topology................................................................................................20

Figure 4-8 Inter-board load-sharing ring topology................................................................................................20

Figure 4-9 Dual-star topology...............................................................................................................................21

Figure 7-1 Command result example....................................................................................................................31



Figure 10-1 Command result example..................................................................................................................73

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Tables

Table 7-1 RF-related alarms in GSM mode...........................................................................................................34

Table 8-1 RF-related alarms in GSM mode...........................................................................................................46

Table 9-1 RF-related alarms and events in UMTS mode......................................................................................58

Table 10-1 RF-related alarms and events in LTE mode........................................................................................74

Table 11-1 Multimode base station common parameters......................................................................................77

Table 11-2 RF-related alarms and events in multiple modes................................................................................83

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1 About This Document

1.1 Scope

This document describes the RF Unit and Topology Management feature. This document is

applicable to the following 3900 series 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)

lDBS3900

l BTS3900C, BTS3900C (Ver.B), and BTS3900C (Ver.C)

Any managed objects (MOs), parameters, alarms, or counters described below correspond to

the software release delivered with this document. Any future 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 Need to understand RF Unit and Topology Management

l Work with Huawei LTE 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 RF Unit and Topology Management feature of a specific product

version.

l Editorial change:

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refers to a change in wording or the addition of information that was not described in the

earlier version.

Document Versions

The document versions are as follows:

l Draft B (2013-02-08)

l Draft A (2012-12-30)

Draft B (2013-02-08)

This is the first commercial release of Draft B of the document for GBSS15.0, RAN15.0,

eRAN6.0, and SRAN8.0. Compared with Draft A (2012-12-30) for SRAN8.0, Draft B

(2013-02-08) includes the following changes.

ChangeType Change Description ParameterChange

Feature

change

Added the Long Term Evolution (LTE) load-sharing ring

topology and engineering guidelines for this topology.

None

Draft A (2012-12-30)

This is the first commercial release of Draft A of the document for GBSS15.0, RAN15.0,

eRAN6.0, and SRAN8.0. Compared with Issue 05 (2012-09-15) for SRAN7.0, Draft A

(2012-12-30) includes the following changes.

Change Type Change Description Parameter Change

Feature change Added new RF modules. None

Deleted RRU/RFU

topologies from the CPRI

MUX topology and added the

deleted part to CPRI MUX

Feature Parameter

Description.

None

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2 Overview

2.1 Introduction to RF Modules

Radio frequency (RF) modules are classified into the following types:

l Remote radio unit (RRU): applies to distributed and macro base stations

l Radio frequency unit (RFU): applies to macro base stations

RRUs and RFUs modulate and demodulate baseband and RF signals, process data, amplify

power, and detect standing waves.

2.2 Introduction to RRU/RFU TopologiesRRU/RFU topologies are networking between the baseband unit (BBU) and RRUs/RFUs over

common public radio interface (CPRI) ports. Common RRU/RFU topologies include the star,

chain, ring, dual-star, and CPRI multiplexing (MUX) topologies.

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3 RRU/RFU Modules

3.1 Overview

This chapter describes the RRU/RFU models, logical types, TX/RX channel, and topologies

supported in Global System for Mobile communications (GSM), Universal Mobile

Telecommunications System (UMTS), and LTE modes, and multimode scenarios. A logical

type is an RRU/RFU type displayed on the local maintenance terminal (LMT) and Configuration

Management Express (CME). In GSM mode, RXU specifications must be configured to identify

RF capabilities for different RF modules.

3.2 RRU/RFU Modules in GSM ModeModel Logical Type TX/RX

ChannelRRU/RFUSpecifications

Topology

RRU3004 DRRU 2T2R - Star, chain, or

ring topology

RRU3008 V1 GRRU 2T2R RRU3008_V1

(RRU3008 V1

SPEC)

Star, chain, or

ring topology

RRU3008 V2 GRRU 2T2R RRU3008_V2

(RRU3008 V2SPEC)

Star, chain, or

ring topology

RRU3908 V1 MRRU 2T2R RRU3908_V1

(RRU3908 V1

SPEC)

Star or chain

topology

RRU3908 V2 MRRU 2T2R RRU3908_V2

(RRU3908 V2

SPEC)

Star or chain

topology

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Model Logical Type TX/RXChannel

RRU/RFUSpecifications

Topology

RRU3922E MRRU 2T2R RRU3922E

(RRU3922E

SPEC)

Star or chain

topology

RRU3926 MRRU 1T2R RRU3926

(RRU3926

SPEC)

Star or chain

topology


(RRU3936

SPEC)

Star or chain

topology


(RRU3928

SPEC)

Star or chain

topology


(RRU3961

SPEC)

Star or chain

topology


(RRU3929

SPEC)

Star or chain

topology


(RRU3942

SPEC)

Star or chain

topology

DRFU DRFU 2T2R - Star or chain

topology

GRFU V1 GRFU 1T2R GRFU_V1

(GRFU V1

SPEC)

Star or chain

topology

GRFU V2 GRFU 1T2R GRFU_V2

(GRFU V2

SPEC)

Star or chain

topology

GRFU V2a GRFU 1T2R GRFU_V2a

(GRFU V2aSPEC)

Star or chain

topology

MRFU V1 MRFU 1T2R MRFU_V1

(MRFU V1

SPEC)

Star or chain

topology

MRFU V2 MRFU 1T2R MRFU_V2

(MRFU V2

SPEC)

Star or chain

topology

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Model Logical Type TX/RXChannel

RRU/RFUSpecifications

Topology

MRFU V2a MRFU 1T2R MRFU_V2a

(MRFU V2a

SPEC)

Star or chain

topology

MRFUd MRFU 2T2R MRFUd

(MRFUd

SPEC)

Star or chain

topology

MRFUe MRFU 1T2R MRFUe

(MRFUe SPEC)

Star or chain

topology

NOTE

The symbol "-" indicates that RRU/RFU specifications are not involved.

3.3 RRU/RFU Modules in UMTS Mode

Model Logical Type TX/RX Channel Topology

RRU3801E MRRU 1T2R Star topology, chain

topology, or cold-

backup ring topology

between two

baseband signal processing boards

RRU3801C MRRU 1T2R Star topology, chain

topology, or cold-


between two

baseband signal

processing boards

RRU3804 MRRU 1T2R Star topology, chain

topology, or cold-


between two

baseband signal

processing boards


topology, or cold-


between two

baseband signal

processing boards

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topology, or cold-


between two

baseband signal

processing boards


topology, or cold-


between two

baseband signal

processing boards


topology, or cold- backup ring topology

between two

baseband signal

processing boards


topology, or cold-


between two

baseband signal

processing boards


topology, or cold-


between two

baseband signal

processing boards


topology, or cold-


between two


RRU3908 V1 MRRU 2T2R Star topology

RRU3908 V2 MRRU 2T2R Star topology

RRU3926 MRRU 1T2R Star topology




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RRU3821E PRRU 2T2R Star topology, chain

topology, or cold-


between two

baseband signal

processing boards

WRFU WRFU 1T2R Star or chain

topology

WRFUa WRFU 1T2R Star topology

WRFUd WRFU 2T2R Star topology

WRFUe WRFU 2T2R Star topology

MRFU V1 MRFU 1T2R Star topology


MRFU V2a MRFU 1T2R Star topology


MRFUd MRFU 2T2R Star topology

MRFUe MRFU 1T2R Star topology

3.4 RRU/RFU Modules in LTE Mode

DuplexMode

Model LogicalType

TX/RXChannel

Topology

Frequency

divisionduplex

(FDD)

RRU3201 LRRU 2T2R Star topology, chain topology, cold-backup

ring topology on one baseband signal processing board, cold-backup ring

topology between two baseband signal

processing boards, or hot-backup ring

topology


ring topology on one baseband signal

processing board, cold-backup ring



topology

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DuplexMode

Model LogicalType

TX/RXChannel

Topology






topology





processing boards, hot-backup ring

topology, or load-sharing ring topology






topology





processing boards, or hot-backup ringtopology









processing board, cold-backup ringtopology between two baseband signal









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DuplexMode

Model LogicalType

TX/RXChannel

Topology







RRU3821E PRRU 2T2R Star topology, chain topology, or cold-

backup ring topology between two


RRU3908

V1

MRR

U

2T2R Star or chain topology

RRU3908

V2

MRR

U


RRU3928 MRR

U


RRU3938 MRR

U


RRU3929 MRR

U


RRU3942 MRR U


LRFU LRFU 2T2R Star topology or hot-backup ring topology

LRFUe LRFU 2T2R Star topology or hot-backup ring topology

MRFU V1 MRF

U

1T2R Star topology

MRFU V2 MRF

U

1T2R Star topology

MRFU V2a MRF

U

1T2R Star topology

MRFUd MRF

U

2T2R Star topology

CRFUd MRF

U

2T2R Star topology

RRU3961 MRR

U


RRU3936 MRR

U


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DuplexMode

Model LogicalType

TX/RXChannel

Topology

RRU3926 MRR

U


Time

division

duplex

(TDD)

RRU3232 MRR

U

4T4R Star topology, chain topology, cold-backup






RRU3251 MRR

U




topology between two baseband signal processing boards, or load-sharing ring

topology

RRU3152-e MRR

U

2T2R Star topology, chain topology, or load-

sharing ring topology

RRU3702 MRR

U

4T4R Star topology, cold-backup ring topology

on one baseband signal processing board,

or cold-backup ring topology between two


RRU3235 MRR

U

4T4R Star topology

RRU3253 MRR

U

8T8R Star topology or load-sharing ring topology

RRU3252 MRR

U





processing boards, or load-sharing ring

topology

RRU3254 MRR U 4T4R Star topology, chain topology, cold-backupring topology on one baseband signal




topology

RRU3256 MRR

U






topology

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DuplexMode

Model LogicalType

TX/RXChannel

Topology

pRRU3901 MPR

U


3.5 RRU/RFU Modules in Multimode Scenarios


RRU3908 V1 MRRU 2T2R Dual-star topology

RRU3908 V2 MRRU 2T2R Dual-star topology

RRU3926 MRRU 1T2R Dual-star topology




MRFU V1 MRFU 1T2R Dual-star topology

MRFU V2 MRFU 1T2R Dual-star topology

MRFUd MRFU 2T2R Dual-star topology

MRFUe MRFU 1T2R Dual-star topology

RRU3821E PRRU 2T2R Star topology, chain

topology, or cold-


between two

baseband signal

processing boards

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4 RRU/RFU TopologiesRRU/RFU topologies are networking between the BBU and RRUs/RFUs over CPRI ports.

Common RRU/RFU topologies include the star, chain, ring, dual-star, and CPRI MUX

topologies.

NOTE

For details about RRU/RFU topologies in the CPRI MUX topology, see CPRI MUX Feature Parameter

Description.

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4.1 Star Topology

Figure 4-1 shows a star topology for RRUs/RFUs.

Figure 4-1 Star topology for RRUs/RFUs

In a star topology, each RRU/RFU is directly connected to a different CPRI port on a baseband

signal processing board or interface board in the BBU. The transport link between an RRU/RFU

and a baseband signal processing board or interface board is called a CPRI link, which is used

to transmit user and control plane data between the RRU/RFU and the baseband signal

processing board or interface board. If the CPRI link is faulty, communication between the RRU/

RFU and the baseband signal processing board or interface board is interrupted.

Star topologies are highly reliable. If an RRU/RFU or the optical channel between the RRU/

RFU and a baseband signal processing board or interface board is faulty, only the cell served by

this RRU/RFU is affected.

Star topologies apply to most areas, especially densely populated areas. Star topologies require

more optical fibers than other topologies.

4.2 Chain Topology

Figure 4-2 shows a chain topology for RRUs/RFUs.

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Figure 4-2 Chain topology for RRUs/RFUs

In a chain topology, only the first-level RRU/RFU is directly connected to a baseband signal

processing board or interface board, and other RRUs/RFUs are cascaded to their upper-level

RRUs/RFUs one by one. The lowest-level RRU/RFU is the chain tail.

Data of a lower-level RRU/RFU is forwarded by its upper-level RRUs/RFUs. The total physical

bandwidth of RRUs/RFUs in a chain cannot exceed the physical bandwidth capacity of the

connected CPRI port on the baseband signal processing board or interface board.

An operation and maintenance (OM) link is set up between each RRU/RFU on the chain andthe baseband signal processing board or interface board. User and control plane data are

transmitted on the corresponding CPRI link.

The following are the maximum numbers of cascading levels supported in different modes if

the physical bandwidth is sufficient:

l GSM supports a maximum of 21 cascading levels for RRUs (GTMUb supports in a GBTS

and GBBP supports in an eGBTS) or three cascading levels for RFUs.

l UMTS supports a maximum of eight cascading levels for RRUs or two cascading levels

for RFUs.

l LTE FDD supports a maximum of four cascading levels for RRUs or eight cascading levels

for pRRUs.

Chain topologies apply to long and narrow, and loosely populated areas, such as highways and

railways. Chain topologies require less optical fibers than other topologies.

Chain topologies are less reliable. If an RRU/RFU or the optical channel is faulty, all cells served

by its lower-level RRUs/RFUs are affected.

4.3 Ring Topology

For GSM, the main control board or interface board in the BBU connects to RRUs in a ring

topology, with RRUs at the two ends of the CPRI cable on the main control board or interface board functioning as the ring head and tail, respectively. Figure 4-3 shows the GSM ring

topology.

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Figure 4-3 GSM ring topology

For UMTS and LTE, the baseband signal processing board in the BBU connects to RRUs in a

ring topology, with RRUs at the two ends of CPRI cable on the baseband signal processing board

functioning as the ring head and tail, respectively. Two types of ring topologies, cold-backup

and hot-backup, are available. A cold-backup ring topology can be on one baseband signal

processing board or between two baseband signal processing boards. A hot-backup ring topology

is always between two baseband signal processing boards. The LTE mode also supports the

load-sharing ring topology, which includes the intra-board load-sharing ring topology and inter-

board load-sharing ring topology.

4.3.1 Cold-Backup Ring Topology on One Baseband Signal

Processing Board or Interface BoardFigure 4-4 shows a cold-backup ring topology on one baseband signal processing board or

interface board.

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Figure 4-4 Cold-backup ring topology on one baseband signal processing board or interface

board

In a cold-backup ring topology on one baseband signal processing board or interface board, if

a baseband signal processing board is faulty, services carried by all RRUs on the ring are

interrupted.

If a failure occurs in a CPRI port on a baseband signal processing board through which RRUs

on the ring communicate with the BBU, services carried by the RRUs are interrupted for a

maximum of 20 seconds.



l GSM supports a maximum of 21 cascading levels for RRUs (GTMUb supports in a GBTS

and GBBP supports in an eGBTS).

l UMTS supports a maximum of eight cascading levels for RRUs.

lLTE FDD supports a maximum of four cascading levels for RRUs.

4.3.2 Cold-Backup Ring Topology Between Two Baseband SignalProcessing Boards

Figure 4-5 shows a cold-backup ring topology between two baseband signal processing boards.

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Figure 4-5 Cold-backup ring topology between two baseband signal processing boards

In a cold-backup ring topology between two baseband signal processing boards, if one baseband

signal processing board is faulty and the other baseband signal processing board works properly

and has sufficient baseband resources, services carried by the faulty baseband signal processing

board are interrupted for a maximum of 20 seconds.

If a failure occurs in a CPRI port through which RRUs on the ring communicate with the BBU,

services carried by the RRUs are interrupted for a maximum of 20 seconds. If a failure occurs

in the CPRI port that is not used for communications, RRU services will not be interrupted.



l UMTS supports a maximum of eight cascading levels for RRUs.

l LTE FDD supports a maximum of four cascading levels for RRUs or eight cascading levels

for PRRUs.

lGSM does not support the cold-backup ring topology.

4.3.3 Hot-Backup Ring Topology

4.3.3 Hot-Backup Ring Topology shows a hot-backup ring topology.

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Figure 4-6 Hot-backup ring topology

In a hot-backup ring topology, each RRU is connected to two baseband signal processing boards

or interface boards in the BBU, and one ring has only one RRU. An OM link is set up between

an RRU and one baseband signal processing board or interface board in the BBU. The same data

on the user plane is simultaneously transmitted on two CPRI links.

Hot-backup ring topologies apply only between two baseband signal processing boards or

interface boards. If one CPRI link is faulty, services are quickly switched over to the other CPRI

link, with service interruption for a maximum of 500 ms. If one baseband signal processing

board or interface board is faulty, cells carried by the baseband signal processing board or

interface board are set up on the other baseband signal processing board or interface board, with

service interruption for a maximum of 20 seconds.

Hot-backup ring topologies are more reliable than cold-backup ring topologies.

4.3.4 Intra-Board Load-Sharing Ring Topology

Figure 4-7 shows the intra-board load-sharing ring topology.

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Figure 4-7 Intra-board load-sharing ring topology

If the physical bandwidth of a CPRI port is insufficient to support a cell, the intra-board load-

sharing ring topology can be used. In this topology, one RRU is connected to two CPRI ports

on one LBBP. The two CPRI ports ensure sufficient bandwidth for the cell.

4.3.5 Inter-Board Load-Sharing Ring TopologyFigure 4-8 shows the inter-board load-sharing ring topology.

Figure 4-8 Inter-board load-sharing ring topology

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The inter-board load-sharing ring topology applies to RRUs serving multiple carriers (At present,

the LTE mode supports a maximum of two carriers on one RRU). In this topology, one RRU is

connected to the CPRI port on two LBBPs. One CPRI link transmits data for one carrier. The

OM channel can only be set up on one of the two CPRI links.

If the CPRI port that carries the OM channel becomes faulty, the OM channel automatically

switches over to the other CPRI port on the other LBBP. If either of the two CPRI ports becomes

faulty and the physical bandwidth of the CPRI port is insufficient to support a cell, cell

specifications will be degraded. For example, the antenna mode of the sector corresponding to

the cell will be degraded from 8T8R to 4T4R.

4.4 Dual-Star Topology

This section describes the following multimode features:

l MRFD-210002 Multi-mode BS RRU/RFU star-connection with separate CPRI interface(GBTS)

l MRFD-220002 Multi-mode BS RRU/RFU star-connection with separate CPRI interface

(NodeB)

l MRFD-230002 Multi-mode BS RRU/RFU star-connection with separate CPRI interface

(eNodeB)

In a GU or GL dual-mode scenario, both RRUs and RFUs support dual-star topologies. In a UL

dual-mode scenario, only RRUs support dual-star topologies.

In a dual-star topology (for example, a GU base station), a dual-mode RRU/RFU is connected

to a UBRI and a WBBP that use different radio access technologies (RATs), as shown in Figure4-9.

Figure 4-9 Dual-star topology

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In this scenario, a CPRI link is set up between a dual-mode RRU/RFU and the baseband signal

processing board or interface board. Each CPRI link is dedicated to one RAT so that user and

control plane data for the two RATs are transmitted over the two CPRI links independently.

If one CPRI port on one baseband signal processing board or interface board is faulty, the services

of the other RAT are not affected. Therefore, dual-star topologies are highly reliable.

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5 Related Features None

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6 Network Impact No impact.

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7 Engineering Guidelines (GSM_GBTS)

7.1 When to Use RF Unit and Topology Management

RF unit and topology management is a basic feature and must be enabled.

7.2 Required Information

l Obtain the names of RF modules.

l Select a topology for the network based on the network plan and specific topology

characteristics.

7.3 Network Planning

None

7.4 Deployment

7.4.1 Requirements

RF modules are installed and connected to the BBU based on the required topology. For details,see the installation guide for the corresponding type of base station.

7.4.2 Data Preparation

This section describes the data that you need to collect for setting parameters. Required data is

data that you must collect for all scenarios. Collect scenario-specific data when necessary for a

specific feature deployment scenario.

There are three types of data sources:

l Network plan (negotiation not required): parameter values planned and set by the operator

l

Network plan (negotiation required): parameter values planned by the operator andnegotiated with the evolved packet core (EPC) or peer transmission equipment

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l User-defined: parameter values set by users

Required Data

Collect the following information before preparing required data:

l RRU/RFU model

l RRU/RFU topology, which is used to determine the configuration of RRU/RFU links

1. The following table describes the parameters related to BTSRXUCHAIN.

ParameterName

Parameter ID

Setting Notes DataSource

RRU

Chain

No.

RCN This parameter uniquely identifies an RRU/RFU

chain or ring in a GBTS.

Network

plan

(negotiation

not

required)

Topo

Type

TT l In the star and chain topologies, this parameter

must be set to CHAIN. In the star topology,

only one RRU/RFU is configured on a chain.

l In the ring topology, set this parameter to

RING and configure two CPRI ports.

Network

plan

(negotiation

not

required)

Head

Cabinet

No.

HCN Cabinet number, subrack number, slot number,

and CPRI port number of the board on which the

CPRI port serving as the chain/ring head and ring

tail is located. These parameters are set according

to site configuration.

When configuring cabinet, subrack, slot, and port

numbers, satisfy the following requirements:

l Cabinet number: 0 to 7.

l Subrack number: 0 or 1.

l When the GTMU is used to connect an RRU/

RFU, you can only set a slot number to 6.

l When the UBRI is used to connect RRU/RFU,

set a slot number to 2.l When the GBBP is used to connect an RRU/

RFU, you can set a slot number to a value in

the range of 0 to 4.

l Optical port number: 0 to 5. The values of

Head Port No. and Tail Port No. cannot be

the same.

User-

defined

Head

Subrack

No.

HSRN User-

defined

Head

Slot No.

HSN User-

defined

Head

Port No.

HPN User-

defined

Tail

Cabinet

No.

TCN User-

defined

Tail

Subrack

No.

TSRN User-

defined

Tail Slot

No.

TSN User-

defined

Tail Port

No.

TPN User-

defined

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2. The following table describes the parameters related to BTSRXUBRD.

ParameterName

Parameter ID


Board

Type

BT Set this parameter based on the type of the RF

module in use. For details, see 3 RRU/RFU

Modules.

Network

plan

(negotiation

not

required)

RXU

Specific

ation

RXUSP

EC

This parameter specifies the capability of an RF

module to transmit RF signals. Set this parameter

based on the hardware type for the RF module.

For details, see 3 RRU/RFU Modules.

Network

plan

(negotiation

not

required)

Cabinet

No.

CN l This parameter for an RRU must be set to 0.

l This parameter for an RFU can be set to a

value ranging from 0 to 62.

User-

defined

Subrack

No.

SRN l This parameter for an RRU can be set to a


l This parameter can be set to 4 or 5 for an RFU

in a BTS3900L cabinet, and must be set to 4

for an RFU in other types of cabinets.

User-

defined

Slot No. SN l This parameter for an RRU must be set to 0.

l This parameter can be set from 0 to 8 for anRFU in a BTS3900AL cabinet, and can be set

from 0 to 5 for an RFU in other types of

cabinets.

User-

defined

RXU

Chain

No.

RXUCH

AINNO

Set this parameter based on site requirements. Network

plan

(negotiation

not

required)

RXU

BoardPosition

RXUPO

S

This parameter specifies the position of an RRU/

RFU on an RRU/RFU chain or ring. The value of this parameter is set sequentially from 1. The

value of this parameter for an RRU/RFU must

differ from that for any other RRU/RFU

configured on the same RRU/RFU chain.

In the chain topology, an RRU/RFU directly

connected to the BBU is the chain head and is

sequentially numbered from 1.

Network

plan(negotiation

not

required)

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ParameterName

Parameter ID


Power

Class

PWRM

ODE

Set this parameter based on the specified power

mode.

Network

plan

(negotiation

not

required)

3. The following table describes the parameters related to BTSRXUBP.

ParameterName

Parameter ID


RXUChain

No.

RXUCH

AINNO

Set this parameter based on site requirements. Network plan

(negotiation

not

required)

RXU

Name

RXUNA

ME

This parameter is optional. Set this parameter to

a string containing 1 to 64 characters based on site

requirements.

Network

plan

(negotiation

not

required)

RXUBoard

Type

RXUTY

PE Set this parameter based on the type of the RXUin use. The setting must be consistent with that of

the BT parameter. For details, see 3 RRU/RFU

Modules.

Network plan

(negotiation

not

required)

Workin

g

Standar

d

WORKI

NGSTA

NDARD

This parameter specifies the working mode of an

RXU. Set this parameter based on site

requirements.

Network

plan

(negotiation

not

required)

Scenario-specific Data

Scenario 1: Star topology

l The following table describes the parameter related to BTSRXUCHAIN.

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ParameterName

Parameter ID


Topo

Type

TT Set this parameter to CHAIN. Network

plan

(negotiation

not

required)

l The following table describes the parameters related to BTSRXUBRD.

ParameterName

Parameter ID


RXUChain

No.

RXUCH

AINNO

Set this parameter to the number of the RRU/RFUchain.

Network plan

(negotiation

not

required)

RXU

Board

Position

RXUPO

S

Set this parameter to 1. Network

plan

(negotiation

not

required)

Scenario 2: Chain topology


ParameterName

Parameter ID


Topo

Type

TT Set this parameter to CHAIN. Network

plan

(negotiation

not

required)


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ParameterName

Parameter ID


RXU

Chain

No.

RXUCH

AINNO

Set this parameter to the number of the RRU/RFU

chain.

Network

plan

(negotiatio

n not

required)

RXU

Board

Position

RXUPO

S

Set this parameter based on the number of RRUs/

RFUs. For example, set the parameter to 1 for the

first RRU/RFU and 2 for the second RRU/RFU.

Network

plan

(negotiatio

n not

required)

Scenario 3: Ring topology


ParameterName

Parameter ID


Topo

Type

TT Set this parameter to RING. Network

plan

(negotiatio

n not

required)


ParameterName

Parameter ID


RXU

Chain

No.

RXUCH

AINNO

Set this parameter to the number of the RRU ring. Network

plan

(negotiatio

n notrequired)

RXU

Board

Position

RXUPO

S

Set this parameter based on the number of RRUs.

For example, set the parameter to 1 for the first

RRU and 2 for the second RRU.

Network

plan

(negotiatio

n not

required)

7.4.3 Precautions

N/A

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7.4.4 Initial Configuration

When you use an RRU/RFU or let an MRRU/MRFU work in single-mode scenarios, the slot

numbers must be different for RFUs that work in different network modes in the same RFC.

The following describes the initial configuration in a GSM network.

Configuring a Single GBTS Using the GUI

For detailed operations, see 3900 Series Base Station Initial Configuration Guide and follow

the "Procedure" according to the following path: 3900 Series Base Station Initial

Configuration (Based on CME) > Creating Base Stations > Creating GBTSs > Creating s

Single GBTS > Configuring GBTS Device Data > Configuring RF Units

Configuring GBTSs in Batches

For detailed operations, see 3900 Series Base Station Initial Configuration Guide and follow

the "Procedure" according to the following path: 3900 Series Base Station InitialConfiguration (Based on CME) > Creating Base Stations > Creating GBTSs > Creating

GBTSs in Batches

Configuring a Single GBTS Using MML Commands

1. Run the ADD BTSRXUCHAIN command to add an RXU chain/ring. In this step, set RRU/

RFU chain or ring parameters in 7.4.2 Data Preparation.

2. Run the ADD BTSRXUBRD command to add an RRU/RFU. In this step, set RRU/RFU

parameters in 7.4.2 Data Preparation.

3. Run the SET BTSRXUBP command to set RXU board parameters. For the parameter

settings, see 7.4.2 Data Preparation.

7.4.5 Activation Observation

After configuration data is activated, make sure that no RRU/RFU alarm appears on the Alarm/

Event tab page on the GSM LMT. For the description of RRU/RFU alarms, see 7.6

Troubleshooting.

On the BSC LMT or the M2000, run the DSP BTSBRD command to check the status of the

RRU/RFU.

The status of the RRU/RFU is normal if the value of Board State is Normal, as shown in Figure

7-1.

Figure 7-1 Command result example

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7.4.6 Reconfiguration

Adjusting RRU/RFU Topologies

The RRU/RFU topology is adjusted by modifying the connection mode of RRUs/RFUs during

capacity expansion. In GSM mode, topology adjustment includes splitting one RXU ring into

one or more RXU chains and combining one or more RXU chains into one RXU ring.

l Splitting an RXU ring into one or more RXU chains

Step 1 Run the SET BTSBREAKPOINT command to set breakpoints of an RXU ring.

ParameterName

Parameter ID Remarks

Chain No. RCN This parameter uniquely identifies an RXU chain/ring

in a GBTS.

Position of

Break Point 1/

Position of

Break Point 2

BP1

BP2

Set this parameter based on site requirements.

l If you want to split one RXU ring into one RXU

chain, set BP1 at the end of the chain.

l If you want to split one RXU ring into two RXU

chains, set BP1 and BP2 on the RXU ring. It is

recommended that BP1 and BP2 overlap.

Step 2 Run the SPT BTSRXUCHAIN command to split the RXU ring into one or more RXU chains.

ParameterName


Chain No. RCN This parameter uniquely identifies an RXU chain/ring

in a GBTS.

Separate

Position

SEPARATEPO

S


l If you want to split an RXU ring into an RXU chain,

set SEPARATEPOS at the end of the chain.

l If you want to split an RXU ring into two RXU

chains, set SEPARATEPOS on the RXU ring. It is

recommended that the setting be consistent with thatof BP1 and BP2.

----End

NOTE

If breakpoints are added on an RRU/RFU chain or ring, remove these breakpoints and restore the link after

adjusting the RRU/RFU topology.

l Combining one or more RXU chains into an RXU ring

Run the CBN BTSRXUCHAIN command to combine one or more RXU chains.

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ParameterName


Combine Type CHAINTORIN

G

This parameter identifies the combination type.

CHAINTORING indicates combining an RXU chain

as an RXU ring, and COMBINECHAINS indicates

combining two RXU chains as an RXU ring.

First RXU

Chain No.

RCN1 The two parameters identify the numbers of the first and

second RXU chains.

Second RXU

Chain No.

RCN2

Tail Cabinet

No.

TCN The four parameters are mandatory only when the value

of Combine Type is CHAINTORING. Set them to the

onsite cabinet number, subrack number, slot number of

the tail CPRI port, and the tail CPRI port number,respectively.

Tail Subrack

No.

TSRN

Tail Slot No. TSN

Tail Port No. TPN

Adding an RRU/RFU to an RRU/RFU Chain or Ring

An RRU/RFU can be added to any position in an RRU/RFU chain or ring without changing the

original topology.

Step 1 Run the SET BTSBREAKPOINT command to set breakpoints for adding an RRU/RFU to anRRU/RFU chain or ring.

ParameterName


Chain No. RCN This parameter uniquely identifies an RRU/RFU chain

or ring in a GBTS.

Position of

Break Point 1/

Position of

Break Point 2

BP1

BP2


l Only one breakpoint is allowed in one RXU chain,

and the value of this parameter must be smaller than

or equal to the number of boards under the chain.

l Two breakpoints are required for each RXU ring,

and the value of BP1 must be smaller than or equal

to that of BP2. The values of BP1 and BP2 must be

smaller than or equal to the number of boards under

the ring.

Step 2 Run the ADD BTSRXUBRD command to add an RRU/RFU. For the setting of parameters, seethe description of collecting information about an RRU chain or ring in 7.4.2 Data

Preparation.

----End

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NOTE



Removing an RRU/RFU from an RRU/RFU Chain or Ring

Step 1 Run the SET BTSBREAKPOINT command to set breakpoints for removing an RRU/RFUfrom an RRU/RFU chain or ring.

ParameterName


Chain No. RCN This parameter uniquely identifies an RRU/RFU chain

or ring in a GBTS.

Position of

Break Point 1/Position of

Break Point 2

BP1

BP2


l Only one breakpoint is allowed in one RXU chain,and the value of this parameter must be smaller than

or equal to the number of boards under the chain.

l Two breakpoints are required for each RXU ring,

and the value of BP1 must be smaller than or equal

to that of BP2. The values of BP1 and BP2 must be

smaller than or equal to the number of boards under

the ring.

Step 2 Run the RMV BTSRXUBRD command to remove an RRU/RFU.

----End

NOTE



7.5 Performance Optimization

N/A

7.6 Troubleshooting

For the description of RF-related alarms and events in GSM mode, see BSC6910/BSC6900 GSM

Alarm Reference and BSC6910/BSC6900 GSM Event Reference.

Table 7-1 RF-related alarms in GSM mode

Alarm ID Alarm Name AlarmType

AlarmSeverity

EventType

ALM-26501 RF Unit Optical Module or Electrical

Port Not Ready

Fault Major Commu

nication

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AlarmSeverity

EventType

ALM-26502 RF Unit Optical Module Type Mismatch Fault Major Commu

nication

ALM-26503 RF Unit Optical Module Transmit/

Receive Fault

Fault Major Commu

nication

ALM-26504 RF Unit CPRI Interface Error Fault Major Commu

nication

EVT-26505 RF Unit CPRI Interface Switchover Event Minor Commu

nication

ALM-26506 RF Unit Optical Interface Performance

Degraded

Fault Major/

Minor

Commu

nication

ALM-26507 RF Unit Optical Module Fault Fault Warning Communication

ALM-26520 RF Unit TX Channel Gain Out of Range Fault Minor Hardwar

e

ALM-26521 RF Unit RX Channel RTWP/RSSI Too

Low

Fault Minor Hardwar

e

ALM-26522 RF Unit RX Channel RTWP/RSSI

Unbalanced

Fault Minor Hardwar

e

ALM-26524 RF Unit PA Overcurrent Fault Major Hardwar

e

ALM-26525 RF Unit Temperature Unacceptable Fault Major/

Minor

Hardwar

e

EVT-26526 RF Unit TX Channel Switched Off Event Major Hardwar

e

ALM-26527 RF Unit Input Power Out of Range Fault Major Hardwar

e

EVT-26528 RF Unit TX Channel Switched On Event Minor Hardwar

e

ALM-26529 RF Unit VSWR Threshold Crossed Fault Major/

Minor

Hardwar

e

ALM-26530 RF Unit ALD Current Out of Range Fault Minor

Warning

Hardwar

e

ALM-26531 RF Unit ALD Switch Configuration

Mismatch

Fault Minor Hardwar

e

ALM-26532 RF Unit Hardware Fault Fault Major/

Minor

Hardwar

e

ALM-26533 RF Unit Software Program Error Fault Major Running

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AlarmSeverity

EventType

ALM-26534 RF Unit Overload Fault Minor Running

EVT-26535 RF Unit Startup Event Minor Hardwar e

ALM-26536 RF Unit Multi-Mode Configuration

Conflict

Fault Minor Running

ALM-26538 RF Unit Clock Problem Fault Major Hardwar

e

ALM-26540 RF Unit AC Input Power Failure Fault Major Power

ALM-26541 ALD Maintenance Link Failure Fault Major Commu

nication

ALM-26542 RF Unit Backup Power Device

Maintenance Link Failure

Fault Major Commu

nication

ALM-26543 RF Unit External Device Maintenance

Link Failure

Fault Major Commu

nication

ALM-26544 RF Unit Power Surge Protector Fault Fault Major Hardwar

e

ALM-26545 RF Unit TX Channel Switched Off

Through Command

Fault Warning Running

ALM-26546 RF Unit External Power SupplyInsufficient

Fault Major Minor

Hardwar e

ALM-26751 RET Antenna Motor Fault Fault Minor Hardwar

e

ALM-26752 ALD Hardware Fault Fault Major/

Minor

Hardwar

e

ALM-26753 RET Antenna Not Calibrated Fault Minor Hardwar

e

ALM-26754 RET Antenna Data Loss Fault Minor Hardwar

e

ALM-26755 TMA Bypass Fault Major Hardwar

e

ALM-26757 RET Antenna Running Data and

Configuration Mismatch

Fault Minor Hardwar

e

ALM-26758 TMA Running Data and Configuration

Mismatch

Fault Minor Hardwar

e

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8 Engineering Guidelines (GSM_eGBTS)

8.1 When to Use RF Unit and Topology Management

RF Unit and Topology Management is a basic feature and must be enabled.

8.2 Required Information

l Obtain the names of RF modules.

l Select a topology for the network based on the network plan and specific topology

characteristics.

8.3 Network Planning

None

8.4 Deployment

8.4.1 Requirements

RF modules are installed and connected to the BBU based on the required topology. For details,see the installation guide for the corresponding type of base station.

8.4.2 Data Preparation

This section describes the data that you need to collect for setting parameters. Required data is

necessary for all scenarios and must be collected. Collect scenario-specific data when necessary

for a specific feature deployment scenario.

There are three types of data sources:

l Network plan (negotiation not required): parameter values planned and set by the operator

l

Network plan (negotiation required): parameter values planned by the operator andnegotiated with the EPC or peer transmission equipment

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l User-defined: parameter values set by users

Required Data

Collect the following information before preparing required data:

l RRU/RFU model

l RRU/RFU topology, which is used to determine the configuration of RRU/RFU links

1. The following table describes the parameters related to RRUCHAIN.

Parameter Name

Parameter ID


RRU

Chain No.

RCN This parameter uniquely identifies an RRU/RFU

chain or ring in an eGBTS.

Network

plan

(negotiati

on notrequired)

Topo Type TT l In the star and chain topology, this parameter

must be set to CHAIN, and therefore the

TCN , TSRN , TSN , and TPN parameters are

invalid. In the star topology, only one RRU/

RFU is configured on a chain.

l In the ring topology, set this parameter to

RING and configure two CPRI ports and

backup mode.

Network

plan

(negotiati

on not

required)

BackupMode

BM l If the TT parameter is set to CHAIN, the BM parameter must be set to COLD.

l If the TT parameter is set to RING, the BM

parameter can be set to either COLD (cold-

backup ring topology) or HOT (hot-backup

ring topology). If the hot backup mode is used,

the ring head and ring tail must belong to

different interface boards, and only one RRU/

RFU can be added.

Network plan

(negotiati

on not

required)

Access

Type

AT l This parameter specifies the access type of

RXUs. If the access type is local port, the

baseband signal processing board is

connected to the RRU/RFU through a CPRI

port. If the access type is peer port, the local

baseband signal processing board is

connected to the peer baseband signal

processing board through the sCPRI channel

on the backplane, and the peer baseband

signal processing board is then connected to

the RRU/RFU.

Network

plan

(negotiati

on not

required)

Head

Cabinet

No.

HCN Cabinet number, subrack number, slot number,

and CPRI port number of the board on which the

CPRI port serving as the chain/ring head and ring

User-

defined

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Parameter Name

Parameter ID


Head

Subrack

No.

HSRN tail is located. These parameters are set according

to site configuration.

User-

defined

Head Slot

No.

HSN User-

defined

Head Port

No.

HPN User-

defined

Tail

Cabinet

No.

TCN User-

defined

Tail

Subrack

No.

TSRN User-

defined

Tail Slot

No.

TSN User-

defined

Tail Port

No.

TPN User-

defined

BreakPoin

t Position1

BRKPOS

1

This parameter indicates the sequence number

(counting from the ring or chain head) of an RRU/

RFU behind which a ring or chain breaks.

l Only one breakpoint can be configured for anRRU/RFU chain. Two breakpoints must be

configured for an RRU/RFU ring.

l For an RRU/RFU ring, the value of breakpoint

1 must not be greater than the value of

breakpoint 2. If only one breakpoint can be

configured, the values of BreakPoint

Position1 and BreakPoint Position2 must be

the same, indicating that the two breakpoints

are the same.

Network

plan

(negotiati

on notrequired)

BreakPoin

t Position2

BRKPOS

2

Network

plan

(negotiati

on not

required)

CPRI Line

Rate

CR This parameter is set by the user or negotiated

automatically.

User-

defined

2. The following table describes the parameters related to RRU.

Parameter Name

Parameter ID


Cabinet

No.

CN l This parameter for an RRU must be set to 0.

l This parameter for an RFU can be set to a value

ranging from 0 to 62.

User-

defined

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Parameter Name

Parameter ID


Subrack

No.

SRN l This parameter for an RRU can be set to a


l This parameter can be set to 4 or 5 for an RFU

in a BTS3900L cabinet, and must be set to 4

for an RFU in other types of cabinets.

User-

defined

Slot No. SN l This parameter for an RRU must be set to 0.

l This parameter can be set from 0 to 8 for an

RFU in a BTS3900AL cabinet, and can be set

from 0 to 5 for an RFU in other types of

cabinets.

User-

defined

RRU

TopologyPosition

TP This parameter specifies the position where an

RRU/RFU is installed in the topology. Set this parameter to TRUNK .

Network

plan(negotiat

ion not

required)

RRU

Chain No.

RCN Set this parameter based on site requirements. Network

plan

(negotiat

ion not

required)

RRU

Inserted

Position

PS This parameter specifies the position of an RRU/

RFU on an RRU/RFU chain or ring. The value of

this parameter is set sequentially from 0. The

value of this parameter for an RRU/RFU must

differ from that for any other RRU/RFU

configured on the same RRU/RFU chain.

In the chain topology, an RRU/RFU directly

connected to the BBU is the chain head and is

sequentially numbered from 0.

Network

plan

(negotiat

ion not

required)

RRU type RT Set this parameter based on the type of the RF

module in use. For details, see 3 RRU/RFU

Modules.

Network

plan

(negotiat

ion notrequired)

RRU

Working

Standard

RS This parameter specifies the working mode of an

RRU/RFU. Set this parameter based on site

requirements.

Network

plan

(negotiat

ion not

required)

RRU

Name

RN This parameter is optional. Set this parameter to

a string containing 0 to 40 characters based on site

requirements.

This parameter is valid for an RRU.

Network

plan

(negotiat

ion not

required)

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Parameter Name

Parameter ID


Number of

RX

channels

RXNUM Set this parameter to the number of RX channels

of an RRU/RFU.

Network

plan

(negotiat

ion not

required)

Number of

TX

channels

TXNUM Set this parameter to the number of TX channels

of an RRU/RFU.

Network

plan

(negotiat

ion not

required)

Scenario-specific Data

Scenario 1: Star topology

l The following tabl