Intermodulation Testing(GBSS15.0 02)

GSM BSS GBSS15.0

Intermodulation Testing Feature Parameter Description Issue

02

Date

2013-06-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2017. 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 trademarks and trade names mentioned mentioned in this this document are are the property of of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. 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, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations 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 recommendations in this document do not constitute a warranty of any kind, express or implied.

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Website:

http://www.huawei.com

Email:

[email protected]

Issue 02 (2013-06-30)

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

i

GSM BSS Intermodulation Testing Feature Parameter Description

Contents

Contents 1 About This Document.................................................... Document.......................................................................... ............................................ ........................................ .................. 1 1.1 Scope......................................................................... Scope.............................................................................................................................................................................. ..................................................................................................... 1 1.2 Intended Audience.......................................................................................................................................................... Audience.......................................................................................................................................................... 1 1.3 Change History............................................................................................................................................................... History............................................................................................................................................................... 1

2 Technical Description........ Description.............................. ............................................ ............................................. ............................................. ........................................3 ..................3 2.1 Introduction................................................................................................. Introduction.................................................................................................................................................................... ................................................................... 3 2.2 NEs Supporting Supporting the Feature............................................................................................................................................4

3 Engineering Engineering Guidelines............ Guidelines.................................. ............................................ ............................................ ............................................ ................................. ........... 5 3.1 When to Use U se Intermodulation Testing............................................................................................................................ Testing............................................................................................................................ 5 3.2 Deploying Intermodulation Deploying Intermodulation Testing (GBTS).................................................................................................................. (GBTS).................................................................................................................. 5 3.2.1 Deployment Deployment Requirements.......................................................................................... Requirements.......................................................................................................................................... ................................................ 5 3.2.2 Activation................................................................................. Activati on.................................................................................................................................................................... ................................................................................... 6 3.2.3 Activation Activati on Observation................................................................................................................................................ Observation................................................................................................................................................6 6 3.2.4 Deactivation.................................................................................................................................................................6 Deactiva tion.................................................................................................................................................................6 3.3 Deploying Intermodulation Deploying Intermodulation Testing Testing (eGBTS)................................................................................................................ (eGBTS)................................................................................................................ 7 3.3.1 Deployment Deployment Requirements.......................................................................................... Requirements.......................................................................................................................................... ................................................ 7 3.3.2 Activation................................................................................. Activati on.................................................................................................................................................................... ................................................................................... 7 3.3.3 Activation Activati on Observation................................................................................................................................................ Observation................................................................................................................................................8 8 3.3.4 Deactivation.................................................................................................................................................................8 Deactiva tion.................................................................................................................................................................8

4 Parameters............. Parameters................................... ............................................ ............................................ ............................................ ............................................ .................................. ............9 9 5 Counters................. Counters....................................... ............................................ ............................................. ............................................. ............................................ .............................. ........ 10 6 Glossary......... Glossary................................ ............................................. ............................................ ............................................ ............................................ .......................................11 .................11 7 Reference Documents......... Documents............................... ............................................ ............................................ ............................................ ...................................... ................ 12

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1 About This Document

1

About This Document

1.1 Scope This document describes GBFD-119308 GBFD-119308 Intermodulation Testing feature, including its technical principles and engineering guidelines.

1.2 Intended Audience This document is intended for personnel who: l l

Need to understand the features described described herein Work with Huawei products

1.3 Change History This section provides information about the changes in different document versions. There are two types of changes, which are defined as follows: l

Feature change Changes in features of a specific product version

l

Editorial change Changes in wording or addition of information that was not described in the earlier version

02 (2013-06-30) This issue includes the following changes.

Issue 02 (2013-06-30)

Change Type

Change Description

Parameter Change

Feature change

None

None


1


1 About This Document

Change Type

Change Description

Parameter Change

Editor Editorial ial change change

Optimi Optimize zed d the struct structure ure and descri descripti ptions ons throughout the entire document.

None

01 (2013-05-06) This issue does not include any changes.

Draft A (2013-02-27) Compared with Issue 02 (2012-08-30) of GBSS14.0, Draft A (2013-02-27) of GBSS15.0 includes the following changes.

Change Type

Change Description

Feature change

l

Added descriptions about the eGBTS.

l

Added 2.2 NEs Supporting the Feature .

Edit Editor oria iall cha chang ngee

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Opti Optimi mize zed d 3 Engineering Guidelines.


Parameter Change None

None

2


2 Technical Description

2

Technical Description

2.1 Introduction Passive Intermodulation (PIM) is caused by the nonlinearity of passive components. In large power multi-channel systems, systems, intermodulation products are are generated when when two or more signals with different frequencies mix at a non-linear passive component. Intermodulation products can interfere interfere with uplink signals and especially especially impair the receive receive quality when the intermodulation products fall within the receive frequency band. The GBFD-119308 Intermodulation Testing Testing feature is online antenna PIM testing based on traffic. With With this feature, O&M personnel simply run an MML command to start testing, and the test results are automatically displayed on the Local Maintenance Terminal Terminal (LMT). This simplifies the operation and improves testing efficiency. efficiency. The higher the transmit power, the larger the level of intermodulation products. Based on the existing frequencies and power level configured for a cell, Intermodulation Testing compares the changes in uplink interference before and after dummy bursts are sent. The comparison result indicates whether the cell is experiencing intermodulation interference according to the PIM testing thresholds specified by users. The PIM testing thresholds are as follows: l

DeltaThreshold

Specifies the threshold for received signal strength indicator (RSSI) level difference between maximum output power power and no output power. power. If the RSSI level difference difference exceeds this threshold, there is intermodulation interference. l

DutyThreshold

Specifies the threshold for service proportion. Normal services have output power, and therefore the impact of traffic on the accuracy of test results depends on the threshold for service proportion. According to the Intermodulation Testing Testing principles, the lighter the traffic, the more accurate the test results. If the proportion of services exceeds this threshold, the reported test results are unreliable. When this feature is enabled, services on the live network are not affected. It is recommended that this feature be performed when the traffic is light, for example, in the early morning. This avoids the impact of factors, such as co- and adjacent-channel adjacent-channel interference, and ensures the accuracy of test results. This feature checks whether a cell is experiencing intermodulation interference based on frequency and power level configurations. Issue 02 (2013-06-30)


3


2 Technical Description

l

If frequency configurations are changed, Intermodulation Testing Testing must be performed again.

l

If the intermodulation products do not fall within the current working frequency of a cell, intermodulation interference slightly impacts the services in the cell.

2.2 NEs Supporting the Feature Table 2-1 2 -1 NEs supporting the feature

Feature

BSC6900

BSC6910

GBTS

eGBTS

Intermodulation Testing

√

√

√

√

NOTE √ indicates

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that the NE supports this feature. × indicates that the NE does not support this feature.


4


3 Engineering Guidelines

3

Engineering Guidelines

3.1 When to Use Intermodulation Testing Testing This feature is used to check antenna PIM interference. It is recommended that this feature be performed when the traffic is light, for for example, in the early early morning. This ensures the accuracy of test results.

3.2 Deploying Intermodulation Testing (GBTS) 3.2.1 Deployment Requirements Table 3-1 3 -1 Deployment requirements

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Aspect

Requirement

Related features

None

BSC

None

BTS

The following BTSs do not support the Intermodulation Testing feature. l

BTS3900B

l

BTS3900E

l

3012 series base stations with the DTRU (type A)

l

3012 series base stations with the QTRU

GSM networking

None

MS

None

MSC

None

License

None

Others

None


5



3.2.2 Activation Using MML Commands On the BSC LMT, LMT, run the STR BTSRFTST command with Test Type set to PIMONTRAFFIC(Traffic-based Intermodulation Interference Test) and Difference Threshold and Service Rate Threshold set to appropriate values. To perform Intermodulation Testing Testing for multi-site cells, you also need to set Location Group No. to an appropriate value.

MML Command Examples //Activating cell-level Intermodulation Testing STR BTSRFTST: TSTTYPE=PIMONTRAFFIC, TSTTYPE=PIMONTRAFFIC, IDTYPE=BYID, BTSID=1, CELLID=1; //Activating BTS-level Intermodulation Testing STR BTSRFTST: BTSRFTST: TSTTYPE=PIMONTRAFFIC, TSTTYPE=PIMONTRAFFIC, IDTYPE=BYID, BTSID=1;

Using the CME This feature cannot be activated by using the CME.

3.2.3 Activation Observation On the BSC LMT, LMT, run the STR BTSRFTST command to start Intermodulation Testing. The testing takes about 60 seconds, and the BTS reports the testing progress every 10 seconds. When the test stops, the LMT displays the test results. NOTE

Similar to cell-level Intermodulation Testing, BTS-level Intermodulation Testing can also be stopped at any time using the STP BTSRFTST command.

3.2.4 Deactivation Using MML Commands On the BSC LMT, LMT, run the STP BTSRFTST command to deactivate Intermodulation Testing.

MML Command Examples //Deactivating cell-level Intermodulation Testing STP BTSRFTST: TSTTYPE=PIMONTRAFFIC, TSTTYPE=PIMONTRAFFIC, IDTYPE=BYID, BTSID=1, CELLID=1; //Deactivating BTS-level Intermodulation Testing STP BTSRFTST: TSTTYPE=PIMONTRAFFIC, IDTYPE=BYID, BTSID=1; Issue 02 (2013-06-30)


6



Using the CME This feature cannot be deactivated by using the CME.

3.3 Deploying Intermodulation Testing (eGBTS) 3.3.1 Deployment Requirements Table 3-2 3 -2 Deployment requirements

Aspect

Requirement

Related features

None

BSC

None

BTS

None

GSM networking

None

MS

None

MSC

None

License

None

Others

None

3.3.2 Activation Using MML Commands On the BTS LMT, run the STR RFTEST command with Test Type set to PIMONTRAFFIC_ONLINE(PIMONTRAFFIC_ONLINE) and Delta Threshold and DutyThreshold set to appropriate values.

MML Command Examples //Activating slot-level Intermodulation Testing STR RFTEST: TSTTYPE=PIMONTRAFFIC_ONLINE, TSTTYPE=PIMONTRAFFIC_ONLINE, CN=1, SRN=4, SN=1, DELTATHRESHOLD=10, DUTYTHRESHOLD=20; //Activating BTS-level Intermodulation Testing STR RFTEST: TSTTYPE=PIMONTRAFFIC_ONLINE, DELTATHRESHOLD=10, DUTYTHRESHOLD=20;

Using the CME This feature cannot be activated by using the CME. Issue 02 (2013-06-30)


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3.3.3 Activation Observation On the BTS LMT, run the STR RFTEST command to start Intermodulation Testing. The testing takes about 159 seconds, and the BTS reports the testing progress every 20 seconds. When the test stops, the LMT displays the test results. NOTE

Similar to slot-level Intermodulation Testing, BTS-level Intermodulation Testing can also be stopped at any time using the STR RFTEST command.

3.3.4 Deactivation Using MML Commands On the BTS LMT, run the STR RFTEST command to deactivate Intermodulation Testing.

MML Command Examples STP RFTEST: SESSIONID=65536;

Using the CME This feature cannot be deactivated by using the CME.

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4 Parameters

4

Parameters

There are no specific parameters associated with t his feature.

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9


5 Counters

5

Counters

There are no specific counters associated with this feature.

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6 Glossary

6

Glossary

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

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11


7 Reference Documents

7

Reference Documents

There are no specific reference documents associated with this feature.

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Intermodulation Testing(GBSS15.0 02)

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