network structure(sran6.0 01)

Network Structure SRAN6.0

Feature Parameter Description

Issue 01

Date 2011-03-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2012. 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 the 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]

http://www.huawei.com/

mailto:[email protected]

WCDMA RAN

Network Structure Contents

Issue 01 (2011-03-30) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

ii

Contents

1 Introduction ................................................................................................................................ 1-1

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

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

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

2 Overview ..................................................................................................................................... 2-1

3 Technical Description .............................................................................................................. 3-1

3.1 Star Topology ................................................................................................................................. 3-1

3.2 Chain Topology .............................................................................................................................. 3-1

3.3 Tree Topology ................................................................................................................................ 3-1

4 Parameters ................................................................................................................................. 4-1

5 Counters ...................................................................................................................................... 5-1

6 Glossary ...................................................................................................................................... 6-1

7 Reference Documents ............................................................................................................. 7-1

WCDMA RAN

Network Structure 1 Introduction



1-1

1 Introduction

1.1 Scope

This document describes the principles of star topology, tree topology, and chain topology.

This section describes the following features:

MRFD-210204 Star Topology

MRFD-210205 Chain Topology

MRFD-210206 Tree Topology

1.2 Intended Audience

This document is intended for:

Personnel who are familiar with WCDMA basics

Personnel who need to understand the network structure feature

Personnel who work with Huawei products

1.3 Change History

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

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

Feature change: refers to the change in the Network Structure feature.

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

Document Issues

The document issues are as follows:

01 (2011-03-30)

Draft A (2010-12-30)

01 (2011-03-30)

This is the document for the first commercial release of RAN13.0.

Compared with issue Draft A (2010-12-30) of RAN13.0, this issue optimizes the description.

Draft A (2010-12-30)

This is the draft release of RAN13.0.

Compared with issue 01 (2010-10-15) of RAN12.0, this issue optimizes the description.

WCDMA RAN

Network Structure 2 Overview



2-1

2 Overview

The network structure is classified into star topology, tree topology, and chain topology according to the ways of connecting the MBSCs and MBTSs.

The star topology is a traditional structure characterized by simple networking, high link reliability, and low maintenance cost. In a star topology, each MBTS is directly connected to the MBSC through a transmission link.

The chain topology is a traditional structure, with which the timeslot switching function of the MBTS enables the timeslots of an MBTS to be shared by the lower-level MBTSs for transmission. Thus, the transmission cost for timeslot switching devices is reduced. In this topology, the MBTSs can be connected in chains.

The tree topology is a traditional structure applicable to the microwave transmission network. With this feature, the timeslot switching function of the MBTS enables the timeslots of an MBTS to be shared by the lower-level MBTSs for transmission. Thus, the transmission cost for timeslot switching device is reduced. In this topology, the MBTSs can be connected in trees.

WCDMA RAN

Network Structure 3 Technical Description



3-1

3 Technical Description

3.1 Star Topology

The star topology is applied to urban areas, especially densely populated areas. In a star topology, each MBTS is directly connected to the MBSC through a transmission link, as shown in Figure 3-1. The MBTSs are mutually independent. Thus, the network architecture is simple. Generally, this topology is suitable for sites of large configuration.

Figure 3-1 Star topology

3.2 Chain Topology

The chain topology is used along highways or railways and in sparsely populated areas. It can significantly save the transmission resources. In some cases, multiple E1 links can be used for transmission in a chain topology. The number of levels of MBTSs in a chain topology should not exceed five. Figure 3-2 shows a chain topology.

Figure 3-2 Chain topology

3.3 Tree Topology

The tree topology is used in large and sparsely populated areas. The tree topology has a lower demand for the transmission cables than the star topology. Compared with the star topology, the transmission reliability is lower and the construction and maintenance are more complicated because signals pass through many nodes. In addition, the fault in a MBTS may affect the normal operation of its lower-level MBTSs. Capacity expansion is difficult because it may involve great effort in modifying the network architecture. The tree topology applies to areas in which the subscriber distribution is complicated.

In the tree topology, the MBTS obtains the clock signals by locking the upper-level network. Each phase-lock may affect the quality of clock signals. Therefore, the number of levels of MBTSs should not exceed five.

Figure 3-3 shows a tree topology.

WCDMA RAN

Network Structure 3 Technical Description



3-2

Figure 3-3 Tree topology

WCDMA RAN

Network Structure 4 Parameters



4-1

4 Parameters

There are no specific parameters associated with this feature.

WCDMA RAN

Network Structure 5 Counters



5-1

5 Counters

There are no specific counters associated with this feature.

WCDMA RAN

Network Structure 6 Glossary



6-1

6 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

Glossary.htm

WCDMA RAN

Network Structure 7 Reference Documents



7-1

7 Reference Documents

There are no specific reference documents associated with this feature.