Network Structure(SRAN6.0 01)

Network Structure SRAN6.0

Feature Parameter Description

Issue

01

Date

2011-03-30

HUAWEI TECHNOLOGIES CO., LTD.

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WCDMA RAN Network Structure

Contents

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

Issue 01 (2011-03-30)

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

ii


1 Introduction

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.

Issue 01 (2011-03-30)


1-1


2 Overview

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 st ructure 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.

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2-1


3 Technical Description

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 th e 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 b y locking the upper-level network. Ea ch 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.

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3-1


3 Technical Description

Figure 3-3 Tree topology

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4 Parameters

4 Parameters There are no specific parameters associated with this feature.

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4-1


5 Counters

5 Counters There are no specific counters associated with this feature.

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5-1


6 Glossary

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

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6-1


7 Reference Documents

7 Reference Documents There are no specific reference documents a ssociated with this feature.

Issue 01 (2011-03-30)


7-1

Network Structure(SRAN6.0 01)

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