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Call Admisison COntrol Huawei WCDMA RAN 12. explan about admission in Huawei 3G Network

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  • Huawei Proprietary and Confidential

    Copyright Huawei Technologies Co., Ltd

    WCDMA RAN

    Call Admission Control Feature Parameter Description

    Copyright Huawei Technologies Co., Ltd. 2011. 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 the property 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 commercial contract made between Huawei and the customer. All or partial products, services and features described in this document may not be within the purchased scope or the usage scope. Unless otherwise agreed by 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.

  • WCDMA RAN

    Call Admission Control Contents

    Issue 01 (2011-04-30) Huawei Proprietary and Confidential

    Copyright Huawei Technologies Co., Ltd

    i

    Contents

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

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

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

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

    2 Overview of Call Admission Control ................................................................................... 2-1

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

    3.1 Overview ....................................................................................................................................... 3-1

    3.1.1 Admission Resource and Basic Procedure .......................................................................... 3-1

    3.1.2 HSDPA Admission Control .................................................................................................... 3-2

    3.1.3 HSUPA Admission Control .................................................................................................... 3-2

    3.2 CAC Based on Code Resources ................................................................................................... 3-3

    3.3 CAC Based on Power Resources ................................................................................................. 3-3

    3.3.1 Overview ............................................................................................................................... 3-3

    3.3.2 Admission Decision for RRC Connection Setup Requests .................................................. 3-4

    3.3.3 Power-Based Admission Algorithm 1 for RAB Setup ........................................................... 3-5

    3.3.4 Power-Based Admission Algorithm 2 for RAB Setup ........................................................... 3-8

    3.3.5 Power-Based Admission Algorithm 3 for RAB Setup ........................................................... 3-9

    3.4 CAC Based on NodeB Credit Resource ....................................................................................... 3-9

    3.4.1 NodeB Credit ...................................................................................................................... 3-10

    3.4.2 Procedure for Admission Decision Based on NodeB Credit .............................................. 3-10

    3.5 CAC Based on Iub Resources .................................................................................................... 3-10

    3.6 CAC Based on the Number of HSPA Users ................................................................................ 3-10

    3.6.1 CAC for HSDPA Users ....................................................................................................... 3-10

    3.6.2 CAC for HSUPA Users ....................................................................................................... 3-11

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

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

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

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

  • WCDMA RAN

    Call Admission Control 1 Introduction

    Issue 01 (2011-04-30) Huawei Proprietary and Confidential

    Copyright Huawei Technologies Co., Ltd

    1-1

    1 Introduction

    1.1 Scope

    This document describes the call admission control feature, WRFD-020101 Admission Control. It describes how services are granted access and provides the parameters associated with this feature.

    1.2 Intended Audience

    This document is intended for:

    Personnel who are familiar with WCDMA basics

    Personnel who need to understand Call Admission Control (CAC)

    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 CAC 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 (2011-04-30)

    Draft B (2011-03-30)

    Draft A (2010-12-30)

    01 (2011-04-30)

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

    Compared with issue Draft B (2011-03-30) of RAN13.0, this issue has no change.

    Draft B (2011-03-30)

    This is the second draft of the document for RAN13.0.

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

    Draft A (2010-12-30)

    This is the first draft of the document for RAN13.0.

    Compared with issue 04 (2010-12-20) of RAN12.0, this issue optimizes the description.

  • WCDMA RAN

    Call Admission Control 2 Overview of Call Admission Control

    Issue 01 (2011-04-30) Huawei Proprietary and Confidential

    Copyright Huawei Technologies Co., Ltd

    2-1

    2 Overview of Call Admission Control

    Call Admission Control (CAC) is used to determine whether the system resources in a cell are sufficient to accept a resource request. If the system resources are sufficient, the resource request is accepted; otherwise, the resource request is rejected.

    A radio link sends a resource request to the CAC functional module when additional resources are required, in cases such as RRC connection setup, new service setup, change of existing services, soft handover, and cell change. Upon receiving a resource request, the CAC functional module determines whether the request can be accepted by measuring the cell load and the requested resources. For details about measuring the cell load, see the Load Control Feature Parameter Description.

    The admission decision performed using CAC is based on the following resources: code resources, power resources, NodeB credits, and Iub resources. In the case of an HSPA resource request, the admission decision is also based on the number of HSPA users. The admission succeeds only when the resources on which CAC is based are available.

    With CAC, an overloaded cell can accept resource requests for an RRC connection setup only in the case of emergency calls, detachments, or registrations. This is because the priority of such requests is very high. This helps maintain system stability when cells are overloaded. In addition, admitting or rejecting users over FACH or enhanced FACH channels (HS-DSCH) in an overloaded cell can be determined by setting the FACH_UU_ADCTRL subparameter of the NBMCacAlgoSwitch parameter.

  • WCDMA RAN

    Call Admission Control 3 Technical Description

    Issue 01 (2011-04-30) Huawei Proprietary and Confidential

    Copyright Huawei Technologies Co., Ltd

    3-1

    3 Technical Description

    3.1 Overview

    3.1.1 Admission Resource and Basic Procedure

    A radio link sends a resource request to the CAC functional module when additional resources are required. On receipt of the resource request, the CAC functional module performs the admission decision based on the following resources:

    Available cell code resources

    Available cell power resources

    NodeB credits, which are used to me