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HCS WCDMA RAN

Feature Guide

HCS Feature Guide

ZTE Confidential Proprietary © 2010 ZTE Corporation. All rights reserved. I

HCS Feature Guide

Version Date Author Approved By Remarks

V4.0 2010-06-18 Xu Bin Jiang QinSong

© 2010 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be

disclosed or used without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document

is subjected to change without notice.

HCS Feature Guide

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TABLE OF CONTENTS

1 Functional Attribute ............................................................................................1

2 Introduction ........................................................................................................1 2.1 Function Introduction ............................................................................................1 2.1.1 Hierarchical Cell Structures ...................................................................................1

3 Technical Description .........................................................................................2 3.1 HCS Networking Policy.........................................................................................2 3.2 Function Implementation.......................................................................................3 3.2.1 Overview .............................................................................................................3 3.2.2 Handover Policy for UEs in Dedicated State in HCS Networking..............................4 3.2.3 HCS Cell Reselection for UEs in Common Channel State or IDLE State ..................4

4 Parameters and Configuration ............................................................................4 4.1 Parameter List .....................................................................................................4 4.2 Parameter Configuration .......................................................................................4 4.2.1 Share Cover Indication .........................................................................................4 4.2.2 Use of HCS..........................................................................................................5 4.2.3 HCS_PRIO ..........................................................................................................5

5 Counter and Alarm..............................................................................................6

6 Glossary .............................................................................................................6

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FIGURES

Figure 1 HCS ......................................................................................................................1

Figure 2 Methods for Network Capacity Expansion ................................................................3

HCS Feature Guide

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1 Functional Attribute

System version: [RNC V3.09, Node B V4.09, OMMR V3.09, OMMB V4.09]

Attribute: [Optional]

Involved NEs:

UE Node B RNC MSCS MGW SGSN GGSN HLR

√ √ √ - - - - -

Note:

1) "-" indicates that this NE is not involved.

2) "√" indicates that this NE is involved.

Dependency: [None]

Mutual exclusion: [None]

Remarks: [None]

2 Introduction

2.1 Function Introduction

2.1.1 Hierarchical Cell Structures

The Hierarchical Cell Structure (HCS) describes a radio system in which at least two types of cells (such as macro cells and micro cells) are overlaid. Macro cells provide

continuous coverage, whereas micro cells absorb traffic. Low-mobility and high data rate UEs should operate in micro cells, while high-mobility and low data rate UEs should operate in macro cells as much as possible so as to reduce handover and improve the

spectral efficiency and system capacity. The essential aim of HCS is to improve network capacity and QoS.

In HCS, each cell is assigned with an HCS priority level. A macro cell has the lower HCS

level whereas a micro cell has the higher HCS level.

Figure 1 HCS

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Micro Cell

Macro Cell

The HCS feature controls the cell camping policy in areas with overlapped coverage so as to control the user selects network and the traffic in each cell and to achieve load balancing between cells and to attain the camping policy expected by the operator.

The HCS provides hierarchical radio network coverage through micro cells and macro cells. The frequency for each cell can be set in HCS. Besides handover based on coverage, load and services, handover based on moving speed is also implemented in

HCS. In principle, UEs moving at low speed are served by micro cells (with a high HCS level) whereas UEs moving at high speed are served by macro cells (with a low HCS level).

3 Technical Description

3.1 HCS Networking Policy

In general, cells in different layers operate in different frequency and users in different layers are distinguished by the frequency domain in HCS networks.

Theoretically, cells operating at the same frequency or different access networks can

also form an HCS network, but the interference is severe when the HCS network is composed of cells operating at the same frequency. For an HCS network composed of different access networks (such as an HCS network composed of UTMS cells and GSM

cells), different access networks are involved and it is not easy to uniformly control the parameter configuration and the HCS policy. Furthermore, the HCS networking application is restricted because the cells of different access networks have different

capabilities. Therefore, the two scenarios are rare and thus not described in this document.

The major objective at the initial stage of network construction is to guarantee network

coverage. During site selection, the focus should be on hot spots and potential hot s pots so as to save future capacity expansion costs (ensure that equipment rooms and antenna feeder resources can be shared in future capacity expansion projects). The

cells deployed to guarantee network coverage are usually called macro cells.

As the network is gradually constructed, the objective will shift to network capacity improvement. Then new carrier sectors can be deployed in hot spots to meet user

requirements. Since the HCS network operates in a different frequency, it causes very little interference to the existing network and the existing network does not need to be re-planned. This saves the planning cost.

It is recommended that new cells share the same site with the existing cells during HCS network construction. At the initial stage of network construction, macro cells are

HCS Feature Guide

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deployed. As the network traffic grows, multiple schemes can be adopted: 1) a cell operating at a different frequency can be overlaid on a macro cell to improve the network capacity, or 2) a macro cell can be split to multipl e sectors, or 3) the coverage of a

macro cell can be divided into the coverage of several micro cells, or 4) the above three can be combined to ultimately improve network capacity in hot spots.

Figure 2 Methods for Network Capacity Expansion

f2

f1

Cell Split

Cell Fraction

3.2 Function Implementation

3.2.1 Overview

The HCS networking environment mainly involves cell reselection and handover between macro cells and micro cells.

For UEs in dedicated state, the ShareCover parameter is used to configure the relationship between neighboring cell and serving cell so as to determine the handover policy. In general, the value of the ShareCover parameter can be set to 2 (the

neighboring cell covers the serving cell) or 3 (the neighboring cell is contained in the serving cell). When the value of the ShareCover parameter is set to 2 (the neighboring cell covers the serving cell), the coverage area of the serving cell is smaller than and

completely included in the coverage area of the neighboring cell. Then the blind handover mode can be used for handover from the serving cell to the neighboring cell whereas the handover from the neighboring cell to the serving cell should be based on

inter-frequency measurement. When the value of the ShareCover parameter is set to 3 (the neighboring cell is contained in the serving cell), the coverage area of the serving cell is bigger than and completely includes the coverage area of the neighboring cell.

Then the handover from the serving cell to the neighboring cell should be based on inter-frequency measurement whereas the blind handover mode can be used for handover from the neighboring cell to the serving cell.

For UEs in IDLE or common channel state, the UseOfHCS parameter is used to tell a cell whether HCS is used, and the HcsPrio parameter is used to indicate the priority level of an HCS cell. The two parameters are broadcasted in system messages. The UE

HCS Feature Guide

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selects the specific cell selection and reselection policy according to the HCS parameters carried in SIB(System Information Broadcast).

3.2.2 Handover Policy for UEs in Dedicated State in HCS Networking

In the HCS networking environment, ZTE RAN equipment supports handover based on moving speed for UEs in dedicated state. UEs moving at high speed handover to macro cells as much as possible so as to reduce handover, whereas UEs moving at low speed

handover to micro cells so as to improve the system capacity. Handover based on moving speed is an enhancement of the network but not mandatory for the network, and has a lower priority level than load-based handover and handover based on radio quality.

For details on the handover policies and related parameters, refer to ZTE UMTS Handover Control Feature Guide.

3.2.3 HCS Cell Reselection for UEs in Common Channel State or IDLE

State

In the HCS networking environment, ZTE RAN equipment supports cell reselection based on moving speed for UEs in common channel state or IDLE state. UEs moving at

high speed reselect as many macro cells as possible so as to reduce cell updates, whereas UEs moving at low speed reselect micro cells so as to improve the system capacity. For details on the reselection policies and related parameters, refer to ZTE

UMTS Idle Mode and Common Channel Behavior.

4 Parameters and Configuration

4.1 Parameter List Abbreviated Name Parameter Name

ShareCover Share Cover Indication

UseOfHCS Use of HCS

HcsPrio HCS_PRIO

4.2 Parameter Configuration

4.2.1 Share Cover Indication

OMC Path

Interface Path: View -> Configuration Resource Tree -> OMC -> UTRAN

SubnetworkXXX -> RNC Managed ElementXXX -> RNC Config SetXXX (Choose the used config set) -> RNC Radio Resource Management -> Utran Cell -> Utran Cell XXX -> Neighbouring Cell -> Neighbouring Cell XXX -> Share Cover

Indication.

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Parameter Configuration

This parameter describes the neighboring relationship between the serving cell and the neighboring cell, that is, whether the neighboring cell is a neighbor of the

serving cell, overlaps the serving cell, covers the serving cell, or is included in the serving cell.

4.2.2 Use of HCS

OMC Path

Interface Path:

To configure the HCS attribute for the serving cell:

View -> Configuration Resource Tree -> OMC -> UTRAN Subnetwork XXX -> RNC Managed ElementXXX -> RNC Config SetXXX (Choose the used config set) ->RNC Radio Resource Management -> UTRAN Cell -> UTRAN Cell XXX -> Advanced

parameter Manager -> UTRAN Cell -> Use of HCS.

To configure the HCS attribute for the neighboring cell:

View -> Configuration Resource Tree -> OMC -> UTRAN Subnetwork XXX -> RNC

Managed ElementXXX -> RNC Config SetXXX (Choose the used config set) -> RNC Radio Resource Management -> Neighbouring Cell -> Neighbouring Cell XXX -> Use of HCS.

Parameter Configuration

This parameter indicates whether the HCS is used or not.

4.2.3 HCS_PRIO

OMC Path

Interface Path:

To configure the HCS priority level for the serving cell:

View -> Configuration Resource Tree -> OMC -> UTRAN Subnetwork XXX -> RNC Managed ElementXXX -> RNC Config SetXXX (Choose the used config set) -> RNC Radio Resource Management -> UTRAN Cell -> UTRAN Cell XXX ->

Advanced parameter Manager -> UTRAN Cell -> HCS_PRIO.

To configure the HCS priority level for external UTRAN cells (cells not in the current RNC):

View -> Configuration Resource Tree -> OMC -> UTRAN Subnetwork XXX -> RNC Managed ElementXXX -> RNC Config SetXXX (Choose the used config set) -> RNC Radio Resource Management -> External UTRAN Cell -> External UTRAN

Cell XXX -> Advanced parameter Manager -> HCS_PRIO.

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Parameter Configuration

This parameter indicates the HCS priority level for a cell. 7 is the highest priority level, and 0 is the lowest priority level.

5 Counter and Alarm

Under the HCS architecture, the handover is generally inter frequency handover, for the

related counters and alarms refer to ZTE UMTS Handover Control Feature Guide.

6 Glossary

H

HCS Hierarchical Cell Structures

O

OMCR OMC of the RNC