E RAN Troubleshooting Guide(V100R010C10 01)(PDF)-EN PDF

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Summary

Manual Huawei E RAN Troubleshooting Guide (V100R010C10 01)...

Description

eRAN8.1

Troubleshooting Guide Issue

01

Date

2015-12-31

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2015. 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]

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About This Document

About This Document Purpose This document describes how to diagnose and handle eRAN faults. Maintenance engineers can troubleshoot the following faults by referring to this document: l

Faults reflected in user complaints

l

Faults found during routine maintenance

l

Sudden faults

l

Faults indicated by alarms

Product Versions The following table lists the product versions related to this document. Product Name

Solution Version

Product Version

BTS3900

l SRAN10.1

V100R010C10

BTS3900A

l eRAN8.1

BTS3900L BTS3900AL BTS3202E DBS3900

l SRAN10.1

DBS3900 LampSite

l eRAN8.1 l eRAN TDD 8.1

Intended Audience This document is intended for: l

System engineers

l

Site maintenance engineers

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Organization 1 Changes in eRAN Troubleshooting Guide This chapter describes the changes in eRAN Troubleshooting Guide. 2 Troubleshooting Process This chapter describes the general troubleshooting process and methods. 3 Common Maintenance Functions This chapter describes common maintenance functions that are used to analyze and handle faults. It also explains or provides references on how to use the functions. 4 Troubleshooting Access Faults This chapter describes how to diagnose and handle access faults. 5 Troubleshooting Intra-RAT Handover Faults This chapter describes how to diagnose and handle intra-RAT handover faults. RAT is short for radio access technology. 6 Troubleshooting Service Drops This chapter describes the method and procedure for troubleshooting service drops in the Long Term Evolution (LTE) system. It also provides the definitions of service drops and related key performance indicator (KPI) formulas. 7 Troubleshooting Inter-RAT Handover Faults This section defines inter-RAT handover faults, describes handover principles, and provides the fault handling method and procedure. 8 Troubleshooting Rate Faults This chapter provides definitions of faults related to traffic rates and describes how to troubleshoot low uplink/downlink UDP/TCP rates and rate fluctuations. UDP is short for User Datagram Protocol, and TCP is short for Transmission Control Protocol. 9 Troubleshooting Cell Unavailability Faults This chapter defines cell unavailability faults and provides a troubleshooting method. 10 Troubleshooting IP Transmission Faults This section defines IP transmission faults and describes how to troubleshoot IP transmission faults. 11 Troubleshooting Application Layer Faults This chapter describes the definitions of application layer faults and the troubleshooting method. 12 Troubleshooting Transmission Synchronization Faults This chapter describes how to troubleshoot transmission synchronization faults. The faults of this type include the clock reference problem, IP clock link fault, system clock unlocked fault, base station synchronization frame number error, or time synchronization failure. Issue 01 (2015-12-31)

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13 Troubleshooting Transmission Security Faults This chapter describes how to troubleshoot transmission security faults. 14 Troubleshooting RF Unit Faults This chapter describes the method and procedure for troubleshooting radio frequency (RF) unit faults in the Long Term Evolution (LTE) system. 15 Troubleshooting License Faults This chapter describes how to diagnose and handle license faults. 16 Wireless Fault Management Generally, when a radio performance fault or network-level performance fault occurs, OM engineers cannot quickly delimit the fault range and recover the service by resetting, powering off, or replacing corresponding boards. To address this issue, the FMA provides a radio performance fault analysis function, helping OM engineers quickly find the method of recovering services. Using this function, the troubleshooting efficiency is improved. 17 Collecting the Information Required for Fault Location When faults cannot be rectified by referring to this document, collect fault information for Huawei technical support to quickly troubleshoot the faults. This section describes how to collect fault information.

Conventions Symbol Conventions The symbols that may be found in this document are defined as follows. Symbol

Description Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. Indicates a potentially hazardous situation which, if not avoided, could result in equipment damage, data loss, performance deterioration, or unanticipated results. NOTICE is used to address practices not related to personal injury. Calls attention to important information, best practices and tips. NOTE is used to address information not related to personal injury, equipment damage, and environment deterioration.

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General Conventions The general conventions that may be found in this document are defined as follows. Convention

Description

Times New Roman

Normal paragraphs are in Times New Roman.

Boldface

Names of files, directories, folders, and users are in boldface. For example, log in as user root.

Italic

Book titles are in italics.

Courier New

Examples of information displayed on the screen are in Courier New.

Command Conventions The command conventions that may be found in this document are defined as follows. Convention

Description

Boldface

The keywords of a command line are in boldface.

Italic

Command arguments are in italics.

[]

Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... }

Optional items are grouped in braces and separated by vertical bars. One item is selected.

[ x | y | ... ]

Optional items are grouped in brackets and separated by vertical bars. One item is selected or no item is selected.

{ x | y | ... }*

Optional items are grouped in braces and separated by vertical bars. A minimum of one item or a maximum of all items can be selected.

[ x | y | ... ]*

Optional items are grouped in brackets and separated by vertical bars. Several items or no item can be selected.

GUI Conventions The GUI conventions that may be found in this document are defined as follows.

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Convention

Description

Boldface

Buttons, menus, parameters, tabs, window, and dialog titles are in boldface. For example, click OK.

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Convention

Description

>

Multi-level menus are in boldface and separated by the ">" signs. For example, choose File > Create > Folder.

Keyboard Operations The keyboard operations that may be found in this document are defined as follows. Format

Description

Key

Press the key. For example, press Enter and press Tab.

Key 1+Key 2

Press the keys concurrently. For example, pressing Ctrl +Alt+A means the three keys should be pressed concurrently.

Key 1, Key 2

Press the keys in turn. For example, pressing Alt, A means the two keys should be pressed in turn.

Mouse Operations The mouse operations that may be found in this document are defined as follows.

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Action

Description

Click

Select and release the primary mouse button without moving the pointer.

Double-click

Press the primary mouse button twice continuously and quickly without moving the pointer.

Drag

Press and hold the primary mouse button and move the pointer to a certain position.

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Contents

Contents About This Document.....................................................................................................................ii 1 Changes in eRAN Troubleshooting Guide.............................................................................. 1 2 Troubleshooting Process.............................................................................................................. 2 2.1 Troubleshooting Procedure.............................................................................................................................................3 2.2 Troubleshooting Steps.................................................................................................................................................... 4 2.2.1 Backing Up Data......................................................................................................................................................... 4 2.2.2 Collecting Fault Information....................................................................................................................................... 4 2.2.3 Determining the Fault Type......................................................................................................................................... 6 2.2.4 Locating the Root Cause..............................................................................................................................................8 2.2.5 Troubleshooting the Fault............................................................................................................................................ 8 2.2.6 Checking Whether the Fault Has Been Cleared.......................................................................................................... 8 2.2.7 Contacting Technical Support......................................................................................................................................9

3 Common Maintenance Functions............................................................................................ 11 3.1 User Tracing................................................................................................................................................................. 12 3.2 Interface Tracing...........................................................................................................................................................12 3.3 Comparison/Interchange...............................................................................................................................................12 3.4 Switchover/Reset.......................................................................................................................................................... 12 3.5 MBTS Emergency OM Channel.................................................................................................................................. 13 3.5.1 Overview................................................................................................................................................................... 13 3.5.2 Application Scenarios................................................................................................................................................14 3.5.3 Emergency OM Channel Establishment....................................................................................................................16 3.5.4 Function Description................................................................................................................................................. 21 3.5.5 Troubleshooting......................................................................................................................................................... 25 3.5.6 Example of Using the Proxy MML Function............................................................................................................25 3.5.7 Other Operations........................................................................................................................................................30

4 Troubleshooting Access Faults................................................................................................. 31 4.1 Definitions of Access Faults.........................................................................................................................................32 4.2 Background Information...............................................................................................................................................32 4.3 Troubleshooting Method...............................................................................................................................................34 4.4 Troubleshooting Access Faults Due to Incorrect Parameter Configurations............................................................... 37 4.5 Troubleshooting Access Faults Due to Radio Environment Abnormalities.................................................................43

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5 Troubleshooting Intra-RAT Handover Faults....................................................................... 48 5.1 Definitions of Intra-RAT Handover Faults................................................................................................................... 49 5.2 Background Information...............................................................................................................................................49 5.3 Troubleshooting Method...............................................................................................................................................50 5.4 Troubleshooting Intra-RAT Handover Faults Due to Hardware Faults........................................................................52 5.5 Troubleshooting Intra-RAT Handover Faults Due to Incorrect Data Configurations.................................................. 55 5.6 Troubleshooting Intra-RAT Handover Faults Due to Target Cell Congestion............................................................. 57 5.7 Troubleshooting Intra-RAT Handover Faults Due to Poor Uu Quality........................................................................59

6 Troubleshooting Service Drops................................................................................................63 6.1 Definitions of Service Drops........................................................................................................................................ 65 6.2 Background Information...............................................................................................................................................65 6.3 Troubleshooting Method...............................................................................................................................................68 6.4 Troubleshooting Service Drops Due to Radio Faults................................................................................................... 70 6.5 Troubleshooting Service Drops Due to Transmission Faults....................................................................................... 71 6.6 Troubleshooting Service Drops Due to Congestion..................................................................................................... 72 6.7 Troubleshooting Service Drops Due to Handover Failures..........................................................................................73 6.8 Troubleshooting Service Drops Due to MME Faults................................................................................................... 75

7 Troubleshooting Inter-RAT Handover Faults....................................................................... 77 7.1 Definitions of Inter-RAT Handover Faults................................................................................................................... 79 7.2 Background Information...............................................................................................................................................79 7.3 Troubleshooting Method...............................................................................................................................................79 7.4 Troubleshooting Inter-RAT Handover Faults Due to Hardware Faults........................................................................83 7.5 Troubleshooting Inter-RAT Handover Faults Due to Poor UE Capabilities................................................................ 86 7.6 Troubleshooting Inter-RAT Handover Faults Due to Incorrect Parameter Configurations..........................................89 7.7 Troubleshooting Inter-RAT Handover Faults Due to Target Cell Congestion............................................................. 92 7.8 Troubleshooting Inter-RAT Handover Faults Due to Incorrect EPC Configurations...................................................93 7.9 Troubl...