Voice fault diagnosis(gbss15.0 01)

GSM BSSGBSS15.0

Voice Fault Diagnosis FeatureParameter Description

Issue 01

Date 2013-05-06

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2013. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent 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. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase 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 representationsof any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 01 (2013-05-06) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

i

http://www.huawei.com

mailto:[email protected]

Contents

1 About This Document..................................................................................................................11.1 Scope..............................................................................................................................................................................11.2 Intended Audience..........................................................................................................................................................11.3 Change History...............................................................................................................................................................1

2 Feature Support by NE.................................................................................................................3

3 Crosstalk Detection.......................................................................................................................43.1 Overview........................................................................................................................................................................43.2 Technical Description.....................................................................................................................................................43.2.1 Working Principles......................................................................................................................................................53.2.2 Obtaining Crosstalk-related Information.....................................................................................................................53.2.3 Starting and Stopping Crosstalk Detection..................................................................................................................6

4 One-Way Audio Detection..........................................................................................................74.1 Overview........................................................................................................................................................................74.2 Technical Description.....................................................................................................................................................74.2.1 Working Principles......................................................................................................................................................84.2.2 Obtaining One-Way Audio Information......................................................................................................................84.2.3 Enabling One-Way Audio Detection...........................................................................................................................9

5 Related Features...........................................................................................................................11

6 Engineering Guidelines.............................................................................................................126.1 Deploying Voice Fault Diagnosis.................................................................................................................................126.1.1 Deployment Requirements........................................................................................................................................126.1.2 Feature Activation.....................................................................................................................................................126.1.3 Activation Observation..............................................................................................................................................176.1.4 Deactivation...............................................................................................................................................................18

7 Fault Analysis...............................................................................................................................21

8 Parameters.....................................................................................................................................24

9 Counters........................................................................................................................................32

10 Glossary.......................................................................................................................................33

GSM BSSVoice Fault Diagnosis Feature Parameter Description Contents


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11 Reference Documents...............................................................................................................34

GSM BSSVoice Fault Diagnosis Feature Parameter Description Contents


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1 About This Document

1.1 ScopeThis document describes the GBFD-119301 Voice Fault Diagnosis feature, including itsfunctions and technical descriptions.

The Voice Fault Diagnosis feature includes the following features:

l Crosstalk Detectionl One-Way Audio Detection

1.2 Intended AudienceThis document is intended for:

l Personnel who need to understand the Voice Fault Diagnosis featurel Personnel who work with Huawei GSM products

1.3 Change HistoryThis section provides information about the changes in different document versions.

There are two types of changes, which are defined as follows:

l Feature change: refers to a change in the Voice Fault Diagnosis feature of a specific productversion.

l Editorial change: refers to a change in wording or the addition of information that was notdescribed in the earlier version.

Document IssuesThe document issue is as follows:

l 01 (2013-05-06)l Draft A (2013-02-27)

GSM BSSVoice Fault Diagnosis Feature Parameter Description 1 About This Document


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01 (2013-05-06)This is the first commercial release of GBSS15.0.

Compared with Draft A (2013-02-27), Issue 01 (2013-05-06) has no change.

Draft A (2013-02-27)This is a draft.

Compared with Issue 02 (2012-11-07) of GBSS14.0, Draft A (2013-02-27) of GBSS15.0incorporates the changes described in the following table.

Change Type Change Description Parameter Change

Feature change Added descriptions about the BSC6910 andeGBTS.Added the chapter 2 Feature Support byNE.

None

Editorial change Added chapters 5 Related Features and 6Engineering Guidelines.

None

GSM BSSVoice Fault Diagnosis Feature Parameter Description 1 About This Document


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2 Feature Support by NE

Table 2-1 Feature support by NE

Feature BSC6900 BSC6910 GBTS eGBTS

CrosstalkDetection

√ × √ ×

One-WayAudioDetection

√ √ √ √

NOTE

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

GSM BSSVoice Fault Diagnosis Feature Parameter Description 2 Feature Support by NE


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3 Crosstalk Detection

3.1 OverviewUsers are likely to complain if crosstalk frequently occurs on the network. Identifying the sourceof a crosstalk problem is difficult if the information related to the crosstalk is not recorded. Tosolve this problem, the Crosstalk Detection feature has been introduced to log the informationabout the call affected by crosstalk and to provide an alarm mechanism specific to crosstalk.

With the Crosstalk Detection feature, the BSC automatically traces the call and checks whethercrosstalk occurs during the call. If crosstalk occurs, the information about the call, including theserving cell, occupied channel, and serving TRX, is recorded. Such information helpsmaintenance engineers identify a problem without reproducing the problem.

With the alarm mechanism specific to crosstalk, the BSC periodically records the number oftimes crosstalk occurs. When this number exceeds a predefined threshold, the BSC reports analarm. This helps engineers to identify network quality problems and solve these problems beforeusers have an opportunity to notice. Crosstalk Detection applies only to the following speechcoding schemes: full rate (FR), enhanced full rate (EFR), adaptive multirate full rate (AMR_FR)(excluding 12.2 kbit/s), and adaptive multirate half rate (AMR_HR) (excluding 6.7 kbit/s and7.4 kbit/s).

This feature is implemented by the BSC, in collaboration with the transcoder (TC) and the BTS.Therefore, only the crosstalk caused by BSS internal faults can be detected. Any crosstalk causedby Um-interface or MSC faults cannot be detected by using this feature.

Crosstalk Detection has the following benefits:

l Identifies speech quality problems as soon as possible according to alarm information. Thisimproves network quality.

l Enables the BSC to log the information about the call affected by crosstalk, facilitatingproblem location. This improves maintenance efficiency.

The CROCALTMTHRD parameter specifies whether to enable Crosstalk Detection. To enablethe feature, set the CROCALTMTHRD parameter to a value other than 255. Using CrosstalkDetection does not affect the overall BSC performance.

3.2 Technical Description

GSM BSSVoice Fault Diagnosis Feature Parameter Description 3 Crosstalk Detection


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3.2.1 Working PrinciplesThe working principles of the Crosstalk Detection feature are as follows:

The BSC fills a call ID in the idle bits of the FR, EFR, AMR_FR, or AMR_HR speech frames.The BTS and TC then determine whether the call ID is the same as that saved at the BTS andTC. If the call ID in the code stream is different from that saved at the BTS or TC in the periodspecified by the CROCALTMTHRD parameter, the BTS or TC determines that crosstalk isaffecting the call and sends a crosstalk detection report message to the BSC. Upon receiving themessage, the BSC logs the information about the call, including the occupied Abis resources,occupied Ater resources, serving BTS, serving cell, serving TRX, occupied channel, andoccupied TC resources. Meanwhile, the BSC triggers the alarm mechanism specific to crosstalk.This ensures that maintenance engineers can easily obtain the crosstalk information.

The Crosstalk Detection feature can be enabled only when all interfaces use TDM transmission.

3.2.2 Obtaining Crosstalk-related InformationThe BSC obtains the following crosstalk-related information:

l Information about the desired speech signals and undesired speech signalsl Information about BTS network connectionl Crosstalk-related alarms

Information About the Desired Speech Signals and About the Undesired SpeechSignals

Upon detecting crosstalk, the BTS or TC sends a crosstalk detection report message to the BSC.The BSC receives the message and logs the information about the aforementioned resourcesoccupied by the call.

The BSC records the call IDs of the desired speech signals and the undesired speech signals.Based on the call ID of the undesired speech signals, the BSC obtains information about theundesired call and records the information in the log. The information about the undesired callincludes the serving TRX, occupied channel, crosstalk detection type, crosstalk occurrence time,and call index.

Information About BTS Network ConnectionWhen crosstalk occurs during a call, only the information about the serving TRX and theoccupied channel is recorded in the log at the BTS. Crosstalk or one-way audio, however, mayalso occur if BTS network connection fails to be established. Therefore, the BSC must recordthe information about the BTS network connections for the desired speech signals and undesiredspeech signals. The BSC obtains the information about the BTS network connection throughthe operation and maintenance link (OML) over the Abis interface, and records the informationon the OMU.

Frequent reporting of the BTS network connection information may result in Abis interfacecongestion. The BSC and BTS must use a flow control strategy to prevent this problem. TheGetBtsNetTblTimeThd parameter specifies the interval at which the BTS network connectioninformation is reported. Within this interval, the BSC sends the BTS three different messagesto obtain the information about the following BTS network connections: TMU upper-layernetwork connection, SCP upper-layer network connection, and DSP upper-layer networkconnection.



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The information element (IE) "ucChanno" has been added to the messages between the BSCand BTS to synchronize the crosstalk information recorded in the log and the actual crosstalkinformation. The BSC sends a message with the "ucChanno" IE to the BTS and then receives aresponse from the BTS and saves the value of the "ucChanno" IE contained in the response tothe log. In addition, the BSC saves the BTS network connection information to the OMU boardin binary. The current information about the BTS network connection can be sent to the BSC inthe form of a single frame or a multi-frame. When the information is sent to the BSC through amulti-frame, the BSC buffers the multi-frame, compresses it after receiving the entire message,and saves it to the OMU board in binary.

Crosstalk-related AlarmsThe BSC measures the number of times crosstalk occurs on the BSC every 60 minutes.

If the number of times crosstalk occurs in 60 minutes is greater than the value of theSPEECHCHANALARMTHRES parameter, the BSC reports a BSS Internal Voice ChannelAbnormal alarm. In the alarm, the "Voice Abnormal Type" is crosstalk and the number of timesthe voice is abnormal is the number of times crosstalk occurs. If the number of times crosstalkoccurs in the next 60 minutes is less than or equal to the value of theSPEECHCHANRESUMEALARMTHRES parameter, the BSC clears the BSS Internal VoiceChannel Abnormal alarm. In this case, the alarm information includes the actual number of timescrosstalk occurs. Note that the BSS Internal Voice Channel Abnormal alarm cannot be reportedrepeatedly.

3.2.3 Starting and Stopping Crosstalk DetectionTo enable the Cross Detection feature, the following operations must be performed on the LMT:

l Run the SET BSCBASIC command with CROCALTMTHRD set to a value other than255.

l Run the SET GCELLBTSSOFTPARA command with CROCALCHKSW set to ON(ON).



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4 One-Way Audio Detection

4.1 OverviewOne-way audio and no audio are the two most common speech problems that customers complainabout. Identifying a one-way audio or no audio problem, however, is difficult if the necessaryinformation is not recorded in a timely manner. The One-Way Audio Detection feature enablesthe BSC to log the one-way audio information and report an alarm, which facilitates problemidentification and location.

With this feature, the BSC and BTS automatically analyze speech information to check for one-way audio. Upon detecting one-way audio, the BSC logs related information, such as cell ID,serving TRX, channel, port/slot/subrack number of the interface board on the BSC, and thesubrack/slot/path number of the DSP processing the call. This helps operation and maintenance(OM) personnel obtain accurate data without simulating the problem.

This feature allows the BSC to periodically check the number of one-way audio records. If thenumber exceeds the preset threshold, the BSC reports an alarm. If the number of one-way audiorecords is less than the preset threshold, the BSC clears the alarm. This alarm mechanism helpsOM personnel identify one-way audio in advance, minimizing customer complaints.

This feature requires that the BSC and BTS cooperate. Therefore, this feature can detect one-way audio caused by BSS internal faults. In addition, this feature enables the BSC to detect one-way audio caused by MSC faults in A over IP mode. However, in A over TDM mode, theBSC6900 has to be assisted by the A interface CIC one-way audio detection function to detectone-way audio caused by MSC faults.

The One-Way Audio Detection feature has the following benefits:

l Quickly locates speech quality problems on the network based on alarm information,improving the network quality.

l Logs one-way audio information, which facilitates problem location.

Enabling one-way audio detection has a minor impact on the overall performance of the BSCand the BTS.

4.2 Technical Description

GSM BSSVoice Fault Diagnosis Feature Parameter Description 4 One-Way Audio Detection


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4.2.1 Working PrinciplesThe implementation of one-way audio detection is mainly controlled by the BSC. The detectionprocesses are different in TDM and IP transmission modes.

l The detection process in Abis over TDM mode is as follows:

The BSC and BTS monitor the uplink and downlink speech frames over the Abis interfaceto perform class-1 one-way audio detection.

If the proportion of errored frames exceeds the value of EXCEPFRAMETHRES(GSMBSC6900,GSM BSC6910) within the period specified byMUTECHECKCLASS1PERIOD(GSM BSC6900,GSM BSC6910), there is class-1 one-way audio. The BSC and the BTS then start class-2 one-way audio detection.

During class-2 one-way audio detection, the BSC and the BTS send fixed test frames toeach other. If the peer end can receive the test frames, it determines that there was not one-way audio. If the peer end cannot receive any test frames, it determines that there was one-way audio and the BSC logs the call information.

l The detection process in Abis over IP or A over IP mode is as follows:

In Abis over IP mode, the BSC and the BTS periodically send each other monitoring framesthat contain the total number of sent packets. The BSC logs the call information in eitherof the following scenarios:

– The BSC or the BTS does not receive any monitoring frame within the period specifiedby MUTECHECKCLASS1PERIOD(GSM BSC6900,GSM BSC6910).

– The BSC or the BTS receives speech packets and monitoring frames but the packet lossrate calculated based on the number of received packets and the number of sent packetscarried on a monitoring frame exceeds the value of EXCEPFRAMETHRES(GSMBSC6900,GSM BSC6910).

In A over IP mode, the BSC records one-way audio in the voice log in either of the followingscenarios:

– The BSC or the BTS receives less than two speech packets within the period specifiedby MUTECHECKCLASS1PERIOD(GSM BSC6900,GSM BSC6910).

– The packet loss rate calculated based on the number of received packets and the numberof sent packets carried on a Real Time Control Protocol (RTCP) packet exceeds thevalue of EXCEPFRAMETHRES(GSM BSC6900,GSM BSC6910).

One-way audio detection can be performed simultaneously in different transmission modeswithout affecting each other, and all detection results are recorded in the voice log.

4.2.2 Obtaining One-Way Audio InformationThe BSC obtains the following one-way audio information:

l Information about a call affected by one-way audio, recorded in the voice log

l One-way audio alarms

Information About a Call Affected by One-Way Audio

The BSC records call information in the voice log when the BSC or the BTS detects one-wayaudio.



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One-Way Audio Alarms

The BSC measures the number of times one-way audio occurs on the BSC every 60 minutes bydefault.

If the number of one-way audio occurrences reaches the value ofSPEECHCHANALARMTHRES(GSM BSC6900,GSM BSC6910), the BSC reportsALM-21814 BSS Internal Voice Channel Abnormal with Failure Type set to One-wayAudio and Number of One-Way Audio set to the number of one-way audio occurrences. If thenumber of times one-way audio occurs in the next 60 minutes is less than or equal to the valueof SPEECHCHANRESUMEALARMTHRES(GSM BSC6900,GSM BSC6910), the BSCclears ALM-21814 BSS Internal Voice Channel Abnormal if necessary. Note that ALM-21814BSS Internal Voice Channel Abnormal cannot be reported again before it is cleared.

4.2.3 Enabling One-Way Audio DetectionTo enable One-Way Audio Detection, run the following commands on the BSC LMT:

SET BSCBASIC: SpeechAlmPeriod=12, SPEECHCHANALARMTHRES=10,SPEECHCHANRESUMEALARMTHRES=6,MuteTestLogStyle=LEV1_MUTETEST_LOG_REC-0&LEV2_MUTETEST_LOG_REC-1&IP_MUTETEST_LOG_REC-1&CIC_MUTETEST_LOG_REC-0,SpeechErrorForceHOSwitch=OFF;

where

The SPEECHCHANALARMTHRES(GSM BSC6900,GSM BSC6910) parameter must be setbased on actual conditions.

SET GCELLSOFT: IDTYPE=BYID, CELLID=0, TCMUTEDETECTFLAG=ENABLE,MUTECHECKCLASS1PERIOD=5, EXCEPFRAMETHRES=25,MUTECHECKCLASS2SWITCH=ENABLE, DETECTFRAMEPERIOD=2,MUTECHECKPEIROD=4;

Figure 4-1 and Figure 4-2 show the BSC-level and cell-level MML configuration interfaces,respectively. For details about the parameter descriptions, see the MML online help.

Figure 4-1 BSC-level parameters (in the SET BSCBASIC command)



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Figure 4-2 Cell-level parameters (in the SET GCELLSOFT command)



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5 Related Features

Table 5-1 Related features

Feature Prerequisite Feature

Mutually Exclusive Feature AffectedFeature

CrosstalkDetection

None GBFD-117701 BSC Local SwitchGBFD-117702 BTS Local SwitchGBFD-115701 TFOGBFD-115702 TrFOGBFD-118611 Abis IP over E1/T1GBFD-118601 Abis over IPGBFD-150201 A over IP Based on DynamicLoad Balancing

None

One-WayAudioDetection

None GBFD-117701 BSC Local SwitchGBFD-117702 BTS Local Switch

None

GSM BSSVoice Fault Diagnosis Feature Parameter Description 5 Related Features


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6 Engineering Guidelines

6.1 Deploying Voice Fault Diagnosis

6.1.1 Deployment Requirements

Table 6-1 Deployment requirements

Aspect Requirement

Related features See chapter "5 Related Features."

BSC None

BTS The BTS supports this feature.NOTE

The BTS3900B does not support this feature.

GSM networking Crosstalk detection applies only when all interfaces in the GBSS useTDM transmission.

MS None

MSC None

License None

Others None

6.1.2 Feature Activation

Using the LMTl Activating One-Way Audio Detection

GSM BSSVoice Fault Diagnosis Feature Parameter Description 6 Engineering Guidelines


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NOTE

The following configurations are only used for verification. For commercially used networks, configureparameters based on the network plan. After this feature is verified, restore the configurations beforeverification.

On the BSC LMT, perform the following steps:

Step 1 Run the SET BSCBASIC command with its parameters set as follows:l Set One-Way Mute Alarm Reporting Period to 12.l Set Speech Channel Alarm Threshold to 10.l Set Speech Channel Alarm Clearance Threshold to 6.l Set One-Way Audio Log Type to LEV2_MUTETEST_LOG_REC(Record Level2 One-

Way-Audio Test Log) and IP_MUTETEST_LOG_REC(Record IP One-Way-AudioTest Log).

l Set Force HO Upon Speech Problem to an appropriate value.

Step 2 Run the SET GCELLSOFTl Set Mute Detect Class1 Switch to ENABLE(ENABLE).l Set Period of Mute Detect Class1 to 5.l Set Exceptional Frame Threshold of Mute Detect Class1 to 25.l Set Mute Detect Class2 Switch to ENABLE(ENABLE). Set Period of Mute Detect Class2

TRAU Frame to 2.l Set Period of Mute Detect Class2 to 4.

command with its parameters set as follows:

NOTE

l If the proportion of bad frames to all speech frames exceeds the threshold specified by Exceptional FrameThreshold of Mute Detect Class1 within the period specified by Period of Mute Detect Class1, class-2one-way audio detection starts.

l During class-2 one-way audio detection:

If no test speech frames are received within the period specified by Period of Mute Detect Class2, the BSCdetermines that there was one-way audio and logs a one-way audio problem.

If test speech frames are received within the period specified by Period of Mute Detect Class2, the BSCdetermines that there was no one-way audio.

l Within the period specified by One-Way Mute Alarm Reporting Period:

If the number of one-way audio occurrences exceeds the threshold specified by Speech Channel AlarmThreshold, the BSC reports ALM-21814 BSS Internal Voice Channel Abnormal.

If the number of one-way audio occurrences is less than the threshold specified by Speech Channel AlarmClearance Threshold, the BSC clears ALM-21814 BSS Internal Voice Channel Abnormal.

l If Force HO Upon Speech Problem is set to ON(On) and an MS is experiencing class-2 one-way audio,the BSC forcibly hands over the MS to isolate the speech faults.

----End

l Activating Crosstalk Detection

On the BSC6900 LMT, perform the following steps:

Step 1 Run the SET BSCBASIC command with its parameters set as follows:l Set One-Way Mute Alarm Reporting Period to 12.l Set Speech Channel Alarm Threshold to 10.



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l Set Speech Channel Alarm Clearance Threshold to 6.l Set Cross Call Detect Time Threshold to a value other than 255.l Set Force HO Upon Speech Problem to an appropriate value.

Step 2 Run the SET GCELLBTSSOFTPARA command with BTS Crosstalk Detection set to ON(On).

NOTE

l BTS Crosstalk Detection specifies whether to enable crosstalk detection on the BTS side.

l Cross Call Detect Time Threshold specifies the crosstalk duration, which the user can customize.

l If the actual crosstalk duration exceeds the value of Cross Call Detect Time Threshold, the BSCdetermines that crosstalk is affecting the call and logs this crosstalk.

l Within the period specified by One-Way Mute Alarm Reporting Period:

- If the number of crosstalk occurrences exceeds the threshold specified by Speech Channel AlarmThreshold, the BSC reports ALM-21814 BSS Internal Voice Channel Abnormal.

- If the number of crosstalk occurrences is less than the threshold specified by Speech Channel AlarmClearance Threshold, the BSC clears ALM-21814 BSS Internal Voice Channel Abnormal.

l If Force HO Upon Speech Problem is set to ON(On) and an MS is experiencing a crosstalk, the BSChands over the MS to isolate the speech faults.

----End

MML Examples//Activating One-Way Audio Detection

SET BSCBASIC: SpeechAlmPeriod=12, SPEECHCHANALARMTHRES=10,SPEECHCHANRESUMEALARMTHRES=6,MuteTestLogStyle=LEV1_MUTETEST_LOG_REC-0&LEV2_MUTETEST_LOG_REC-1&IP_MUTETEST_LOG_REC-1&CIC_MUTETEST_LOG_REC-0,SpeechErrorForceHOSwitch=OFF;

SET GCELLSOFT: IDTYPE=BYID, CELLID=0, TCMUTEDETECTFLAG=ENABLE,MUTECHECKCLASS1PERIOD=5, EXCEPFRAMETHRES=25,MUTECHECKCLASS2SWITCH=ENABLE, DETECTFRAMEPERIOD=2,MUTECHECKPEIROD=4;

//Activating Crosstalk Detection

SET BSCBASIC: CROCALTMTHRD=64, SpeechAlmPeriod=12,SPEECHCHANALARMTHRES=10, SPEECHCHANRESUMEALARMTHRES=6,SpeechErrorForceHOSwitch=OFF;

SET GCELLBTSSOFTPARA: IDTYPE=BYID, CELLID=0, CROCALCHKSW=ON;

Using the CMENOTE

When configuring the Voice Fault Diagnosis feature on the CME, you must perform a single configurationfirst, and then perform batch modifications if required. You must perform a single configuration for aparameter before batch modifications of the parameter. You are advised to perform batch modificationsbefore logging out of the parameter setting interface.

l Activating One-Way Audio Detection

Step 1 Configure a single object on the CME. (CME single configuration)



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Set parameters on the CME configuration interface according to the operation sequencedescribed in Table 6-2. For the method of performing the CME single configuration, see CMESingle Configuration Operation Guide.

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the icon on theCME configuration interface to start the batch modification wizard. For the method ofperforming batch modifications through the CME batch modification center, press F1 on thewizard interface to obtain online help.

----End

Table 6-2 Configuring parameters on the CME

SN ManagedObject(MO)

NE ParameterName

ParameterID

SupportsCME BatchModification Center

1 BSCBASIC BSC6900/BSC6910

One-WayMute AlarmReportingPeriod

SpeechAlmPeriod

Yes

SpeechChannelAlarmThreshold

SPEECHCHANALARMTHRES

SpeechChannelAlarmClearanceThreshold

SPEECHCHANRESUMEALARMTHRES

One-WayAudio LogType

MuteTestLogStyle

Force HOUpon SpeechProblem

SpeechErrorForceHOSwitch

2 GCELLSOFT

BSC6900/BSC6910

Mute DetectClass1Switch

TCMUTEDETECTFLAG

Yes

Period ofMute DetectClass1

MUTECHECKCLASS1PERIOD



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SN ManagedObject(MO)

NE ParameterName

ParameterID


ExceptionalFrameThreshold ofMute DetectClass1

EXCEPFRAMETHRES


MUTECHECKCLASS2SWITCH

Period ofMute DetectClass2TRAUFrame

DETECTFRAMEPERIOD

Period ofMute DetectClass2

MUTECHECKPEIROD

l Activating Crosstalk Detection





----End



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SN MO NE ParameterName

Parameter ID Supports CMEBatchModificationCenter

1 BSCBASIC BSC6900 One-WayMuteAlarmReportingPeriod

SpeechAlmPeriod Yes

SpeechChannel AlarmThreshold

SPEECHCHANA-LARMTHRES

SpeechChannel AlarmClearanceThreshold

SPEECHCHANRESU-MEALARMTHRES

CrossCallDetectTimeThreshold

CROCALTMTHRD

ForceHOUponSpeechProblem

SpeechErrorForceHOS-witch

2 GCELLBTSSOFTPARA

BSC6900 BTSCrosstalkDetection

CROCALCHKSW No

6.1.3 Activation Observation



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Observe active alarms when crosstalk or one-way audio occurs on the live network.

Expected result: ALM-21814 BSS Internal Voice Channel Abnormal is reported and FailureType is Crosstalk or One-Way Audio.

NOTE

The BSC reports ALM-21814 BSS Internal Voice Channel Abnormal only if the number of crosstalk orone-way audio occurrences exceeds the threshold specified by Speech Channel Alarm Threshold.

6.1.4 Deactivation

Using the LMTl Deactivating One-Way Audio Detection

Step 1 On the BSC LMT, run the SET GCELLSOFT command with Mute Detect Class1 Switch setto DISABLE(DISABLE) and Mute Detect Class2 Switch set to DISABLE(DISABLE).

Step 2 Run the SET BSCBASIC command to deselect LEV1_MUTETEST_LOG_REC(RecordLevel1 One-Way-Audio Test Log) from One-Way Audio Log Type.

----End

l Deactivating Crosstalk Detection

Step 1 On the BSC6900 LMT, run the SET BSCBASIC command with Cross Call Detect TimeThreshold set to 255.

Step 2 Run the SET GCELLBTSSOFTPARA command with BTS Crosstalk Detection set to OFF(Off).

----End

MML Examples//Deactivating One-Way Audio Detection

SET GCELLSOFT: IDTYPE=BYID, CELLID=0, TCMUTEDETECTFLAG=DISABLE,MUTECHECKCLASS2SWITCH=DISABLE;

SET BSCBASIC: MuteTestLogStyle=LEV1_MUTETEST_LOG_REC-0;

//Deactivating Crosstalk Detection

SET BSCBASIC: CROCALTMTHRD=255;

SET GCELLBTSSOFTPARA: CROCALCHKSW=OFF;

Using the CMENOTE

When configuring the Voice Fault Diagnosis feature on the CME, you must perform a single configurationfirst, and then perform batch modifications if required. You must perform a single configuration for aparameter before batch modifications of the parameter. You are advised to perform batch modificationsbefore logging out of the parameter setting interface.

l Deactivating One-Way Audio Detection




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----End



ParameterID


1 GCELLSOFT

BSC6900/BSC6910


TCMUTEDETECTFLAG

Yes


MUTECHECKCLASS2SWITCH

2 BSCBASIC BSC6900/BSC6910

One-WayAudio LogType

MuteTestLogStyle

Yes

l Deactivating Crosstalk Detection





----End



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Table 6-5 Configuring parameter on the CME


ParameterID


1 BSCBASIC BSC6900 Cross CallDetect TimeThreshold

CROCALTMTHRD

Yes

2 GCELLBTSSOFTPARA

BSC6900 BTSCrosstalkDetection

CROCALCHKSW

No



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7 Fault Analysis

Two methods are available for locating one-way audio:

Method 1: Using the Voice Log Analysis functionLog in to the LMT and open the Voice Log Analysis tab page shown in Figure 7-1.

Take BSC6900 as an example. On the Voice Log Analysis tab page, select Mute_Lever2 orMute_IP in the Log Type based on the BSC transmission mode and specify Time Last. Then,click Analyze to start voice log analysis. After the analysis, the fault information is displayed.

Figure 7-1 Voice Log Analysis tab page (BSC6900 LMT)

Method 2: Manually analyzing the voice logEach time a BSC or BTS detects one-way audio, the BSC adds a record in the voice log, whichis saved in the \\mbsc\bam\common\fam\famlogfmt directory. The voice log has a preambleof [CDIG] and can be opened in an EXCEL file by performing the following steps:

1. Open the voice log using EXCEL. In this step, set Files of type to All Files.2. In the displayed Text Import Wizard – Step 1 of 3 window, select Delimited from the

Original data type area, and click Next, as shown in Figure 7-2.

GSM BSSVoice Fault Diagnosis Feature Parameter Description 7 Fault Analysis


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Figure 7-2 Opening the voice log (1)

3. In the displayed Text Import Wizard – Step 2 of 3 window, select Comma from theDelimiters area, as shown in Figure 7-3. In this manner, log information is separated basedon the field type.

Figure 7-3 Opening the voice log (2)



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4. Filter the records in the voice log by using the SubType field. SelectSubType:TDM_L2 for TDM transmission and SubType:IP_MUTE for IP transmission.

5. All resource information is recorded in the voice log each time one-way audio is detected.Therefore, if a node is faulty, it will be recorded in many logs.

6. Determine the faulty node (such as a faulty board or link) that is recorded most frequentlyin the voice log. Ask the customer to replace the faulty board or link.



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8 Parameters

Table 8-1 Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

CROCALTMTHRD

BSC6900 SETBSCBASIC

GBFD-119301 Voice FaultDiagnosis

Meaning:Ifduring a call thecall flag in thecode stream isdifferent fromthe one saved ina transcoder(TC) or a BTScontinuously fora period greaterthan thethreshold, theTC or the BTSconsiders that acrosstalk occursand sends amessage to theBSC. Uponreceiving such amessage, theBSC host boardrecords in a logthe informationabout the currentcall, includingthe informationabout the Abisinterface, Aterinterface, BTS,cell, TRX,channel, andTC.

GSM BSSVoice Fault Diagnosis Feature Parameter Description 8 Parameters


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GUI ValueRange:1~255Unit:sActual ValueRange:1~255Default Value:255

GetBtsNetTblTimeThd

BSC6900 SETBSCBASIC

GBFD-111203 O&M of BSC Meaning:Timeunit forextracting theBTS netconnection. TheBSC is allowedto extract theBTS netconnection onlytwice per unittime. Value 0indicates thatthere is norestriction on thetime ofextracting theBTS netconnection.Value 255indicates thatextracting theBTS netconnection isnot allowed.GUI ValueRange:0~255Unit:minActual ValueRange:0~255Default Value:10



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BSC6900 SETBSCBASIC

GBFD-111203 O&M of BSC Meaning:Threshold of reportingthe speechchannel alarm.When thenumber of timesone-way audiooccurs per "One-Way MuteAlarmReportingPeriod" exceedsthe value of thisparameter, aspeech channelalarm isreported.GUI ValueRange:0~65535Unit:NoneActual ValueRange:0~65535Default Value:50

SPEECHCHANRESUMEA-LARMTHRES

BSC6900 SETBSCBASIC

GBFD-111203 O&M of BSC Meaning:Threshold of clearingthe speechchannel alarm.When thenumber of timesone-way audiooccurs is smallerthan the value ofthis parameter,the speechchannel alarm iscleared.GUI ValueRange:0~65535Unit:NoneActual ValueRange:0~65535Default Value:30



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CROCALCHKSW

BSC6900 SETGCELLBTSSOFTPARA

GBFD-119301 Voice FaultDiagnosis

Meaning:Whether to enable theBTS crosstalkdetectionfunction.GUI ValueRange:OFF(OFF), ON(ON)Unit:NoneActual ValueRange:OFF, ONDefaultValue:OFF(OFF)

EXCEPFRAMETHRES

BSC6900 SETGCELLSOFT

GBFD-111203 O&M of BSC Meaning:Threshold for the rate ofthe number ofbad frames to thetotal number ofvoice frames. Ifthe bad framerate exceeds thisthreshold withinthe "Period ofMute DetectionClass1", mutespeech may bedetected. Thesetting of "MuteDetection Class2 Switch"determineswhether toperform theclass-2 mutedetection.GUI ValueRange:0~100Unit:%Actual ValueRange:0~100Default Value:25



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EXCEPFRAMETHRES


GBFD-111203 O&M of BSC Meaning:Threshold for the rate ofthe number ofbad frames to thetotal number ofvoice frames. Ifthe bad framerate exceeds thisthreshold withinthe "Period ofMute DetectionClass1", mutespeech may bedetected. Thesetting of "MuteDetection Class2 Switch"determineswhether toperform theclass-2 mutedetection.GUI ValueRange:0~100Unit:%Actual ValueRange:0~100Default Value:25



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GBFD-111203 O&M of BSC Meaning:Periodof performingclass-1 mutedetection. if thebad frame ratereaches "BadFrameThreshold ofMute DetectionClass 1" withinthe periodspecified by thisparameter, mutespeech may bedetected. Thesetting of "MuteDetection Class2 Switch"determineswhether toperform theclass-2 mutedetection.GUI ValueRange:0~255Unit:sActual ValueRange:0~255Default Value:5



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GBFD-111203 O&M of BSC Meaning:Periodof performingclass-1 mutedetection. if thebad frame ratereaches "BadFrameThreshold ofMute DetectionClass 1" withinthe periodspecified by thisparameter, mutespeech may bedetected. Thesetting of "MuteDetection Class2 Switch"determineswhether toperform theclass-2 mutedetection.GUI ValueRange:0~255Unit:sActual ValueRange:0~255Default Value:5



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BSC6910 SETBSCBASIC

GBFD-111203 O&M of BSC Meaning:Threshold of reportingthe speechchannel alarm.When thenumber of timesone-way audiooccurs per "One-Way MuteAlarmReportingPeriod" exceedsthe value of thisparameter, aspeech channelalarm isreported.GUI ValueRange:0~65535Unit:NoneActual ValueRange:0~65535Default Value:50

SPEECHCHANRESUMEA-LARMTHRES

BSC6910 SETBSCBASIC

GBFD-111203 O&M of BSC Meaning:Threshold of clearingthe speechchannel alarm.When thenumber of timesone-way audiooccurs is smallerthan the value ofthis parameter,the speechchannel alarm iscleared.GUI ValueRange:0~65535Unit:NoneActual ValueRange:0~65535Default Value:30



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9 Counters

There are no specific counters associated with this feature.

GSM BSSVoice Fault Diagnosis Feature Parameter Description 9 Counters


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10 Glossary

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

GSM BSSVoice Fault Diagnosis Feature Parameter Description 10 Glossary


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11 Reference Documents

There are no specific reference documents associated with this feature.

GSM BSSVoice Fault Diagnosis Feature Parameter Description 11 Reference Documents


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Date post:	19-Jul-2015
Category:	Technology
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Voice fault diagnosis(gbss15.0 01)

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