Nova Explorer
V5.3
1 Overview
2 Main Features
Table of
contents
 How to use
 Administration
 Best Practice
3 UP Specifics
4 RAN Specifics
5 Exercices
 Exercices EPC
 Exercices CoreCS
 Exercices RAN
© 2017 EXFO Inc. All rights reserved.
2
Nova Explorer
Overview
© 2018 EXFO Inc. All rights reserved.
3
NOVA Explorer
Overview
Web application used to investigate xDRs
On any technology
At any location
For any period of time
Advanced features :
Call tracing (multi-interfaces)
Decoding
PCAP export
Software available for Linux
Exfo Portal mode / Standalone mode
Up to 50 simultaneous users (25 by default)
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NOVA Explorer
Overview
First access to application :
A simple click
Launching a
new search
Quick access to
On-line help
Set of
customized predefined views
5
NOVA Explorer - Overview
Online web help
All features presented here are detailed in Online Help
Also includes: xDR dictionary, use case examples, tips, …
Efficient search engine
A question ? Make using the Online Help a habit !
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NOVA Explorer - Overview
Panel layout
Main interface (after successful search) :
1
3
2
1
Filter panel
2
Activity panel
3
Information
panel
4
Status panel
5
Distribution
panel
6
Launch bar
5
4
6
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NOVA Explorer - Overview
Differences between Classic and New Gen
Nova Explorer New Gen is based on Nova Explorer Classic.
•
The UI and the features remain very similar
Differences
-
Nova Explorer New Gen now only query Elasticsearch database (see TSNG architecture for more
details)
-
The query time has been improved with this new database technology
-
CAA / NovaStore: Cigale (MySQL), Sybase IQ database are no more supported
-
The list of supported interfaces is different (check release note to have the list per version)
-
Call traces on Cigale Gb and UP (eSDR/VDR) is not available
-
Distribution behavior: the distribution behavior has been improved for large dataset (see dedicated
slides)
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NOVA Explorer - Overview
Differences between Classic and New Gen
Legacy Hybrid Architecture (Before)
•Analytics solution was available on Big Data Architecture
•Troubleshooting was delivered through the classic solution
•xDR processing: Mediation
•xDR storage: Sybase
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NOVA Explorer - Overview
Differences between Classic and New Gen
TSNG Architecture
•Sybase is replaced by a more
performant and scalable storage solution
(Elastic Search).
•Deployment of Elastic Search is made
in a Containerized/Cloud Native Ready
environment (Kubernetes)
•Mediation is replaced by real-time
consumers adapted from the
Big Data Analytics Architecture
•RAN raw frames (GDRs, MF, RM)
are now stored on the central site
in the Big Data Cluster (HBase)
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Main Features
© 2018 EXFO Inc. All rights reserved.
11
How to Use
Filter panel
NOVA Explorer - How to Use
Before launching a search…
Global Activity
Create a new view from homepage:
Global Activity
Main entry point. Gives access to general activity view (24/7 activity) :
- Signaling CDR
- Data Services
on all interfaces
- Infrastructure Call Trace
xDR Definition
The definition of all xDRs is available in the KPI dictionary of the solution.
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NOVA Explorer - How to Use
Filter panel
Several criteria to define before launching a search :
– Date & Time
– Regions
– Interfaces
– Identity (optional)
– Expression (optional)
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NOVA Explorer - How to Use
Filter panel – Date & Time
Retrieves CDRs based on :
– ‘Process Date’ field if available(all Nova CDRs)
Use of presets for time selection or custom search if specific time
ranges required
Search is strictly bound by start and end hours.
Ex1: a CDR with process date = ‘18:00:00.500’ will not be retrieved by the
search in the figure opposite
Ex2: an eSDR with start date = ‘17:30:00’ and end date = ’18:30:00’ will not be
retrieved either
CDR without valid ‘Process Date’ field are not visible through Nova
Explorer
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NOVA Explorer - How to Use
Filter panel – Regions & Identity
Regions
– Only ElasticSearch is present, which has to be configured during product
installation
Subscriber Activity Search
– MSISDN: search on number / calling number / called number depending on
interfaces
– « Search identities »: gives MSISDN from IMSI and vice versa (needs
Manager mapping provided by operator or discovery treatment). This
behavior can be disactivated by unclicking “Extended Search” option.
– Search on several identities (xxxxx;yyyyy;…), OR filter between all identities
– Enables search period extension (7 days)
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NOVA Explorer - How to Use
Filter panel – Interfaces
Interfaces tree :
Global
Activity
– Only one tree for Global Activity view
– Sorted list of Astellia supported interfaces
Plan (xDR type):
– Signaling: display CDR (including the Call traces)
– Data services : display eSDR and VideoDR
– Infrastructure Call Trace: display vendor call trace
Data grid visualization
– 1 interface of a single plan = mono-interface mode
– Combination of interfaces across several plans = global tracing mode
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NOVA Explorer - How to Use
xDR search
xDR search with progressive Display is initiated by clicking on Button
Characteristics:
– Only one database : ElasticSearch
– Non-deterministic (sampled search) = 2 identical successive requests on ElasticSearch return different top1000 results
– Time period = 24h max
– 1000 CDRs retrieved max (default value, can be configured)
– Request stops when max. nb of CDRs is reached per interface
Request stops
when max. nb of
CDRs is reached
per interface
First CDRs retrieved are
displayed in the grid
Periodical grid refresh
with new CDRs retrieved
Final result displayed in
the grid
At each moment the
search can be
stopped with “Abort”
button if CDR
sample is relevant
for user
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Activity panel
NOVA Explorer - How to Use
Activity panel – Overview
Add a filter
Progress
bar
Count total number
of CDRs
Search for a specific
column
Selection of displayed
columns
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NOVA Explorer - How to Use
Activity panel – Grid features
Multiple selection of xDRs
Several features on columns
– “Freeze” = fix a column on the left so that it won’t move on scrolling
– Auto fit,
– sort,
– hide/display on fly…
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NOVA Explorer - How to Use
Activity panel – Grid content
– A specific grid is displayed for each interface
– By default, a subset of columns is displayed, showing most important parameters
– When user launches a multi-interfaces search, another grid is displayed, showing the
common parameters
– User can select the displayed columns among the list of available fields (See complete
list in KPI Dictionary) :
Search for
specific columns
List of hidden
columns
List of
displayed
columns
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NOVA Explorer - How to Use
Information panel
Summarizes criteria used for search/distribution
May give additional information when accessing from 3rd-party applications :
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NOVA Explorer - How to Use
Status panel
Console: gives details for encountered errors
Progress: real-time information regarding treatment (for all requested interfaces)
Details on requested databases :
- Total = number of databases matching the criteria
- Scanned = number of databases that returned results
- Aborted = number of requested databases that did not return results before ‘cancel’ (cf.
search mechanisms)
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NOVA Explorer - How to Use
Geolocation Panel
•
•
•
•
Geolocation feature is used to troubleshoot CDRs through the display of mobile start and
end positions and cell geographic locations on a map.
Prerequisites: At least one CDR is highlighted in the Activity grid
Two types of elements are displayed on the map: cells and mobiles.
Geolocation can be used in two different modes
–
–
Geolocate selected
All grid gelolocation
More info in Specific RAN Part
© 2017 EXFO Inc. All rights reserved.
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NOVA Explorer - How to Use
Distribution
– Distribution on one column: direct access
– Distribution on several columns :
Additional features :
-
.csv or image export
Re-ordering on any column
Top values only display
Number of distinct elements
Statistics (sum, min, max, average)
for numeric fields
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NOVA Explorer - How to Use
Histogram
•
For some numeric columns Histogram distribution
is available
•
User can change the number of Steps
•
And the Min and Max values of the histogram
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NOVA Explorer - How to Use
Multiple Distribution
• Multiple distribution display CDRs
distribution for more then one column
(maximum of 4 columns).
•
Statistics and histogram aren’t generated for
multiple distribution
•This distribution shows the mapping
of Standard Cause and Internal
Release Cause of blocked connections.
•Number of distributed CDR is 2772127.
•Number of combinations of Last cause
and Internal Release cause is 507.
© 2017 EXFO Inc. All rights reserved.
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NOVA Explorer - How to Use
Filter creation
An expression is composed of one or several filters
– Filter syntax = <field> operator <value>
Add a filter:
– From the data grid: composition in the expression bar
– From the data grid: double-click on a cell (<field> = <value>)
– From a distribution: double-click on an element (<field> = <value>)
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NOVA Explorer - How to Use
Expression management
Expression representation: tree of filters combined with AND/OR operator
May be translated as :
Result = result-ok
AND ( (Type = s1-type-attach AND Authentication Nb = 1)
OR (Type = s1-type-service-request AND S1AP Cause = NULL) )
Modify filter :
Enable/disable a filter in expression
Remove filter from expression
Toggle AND/OR filter
Modify filter
Drag’n drop filters within expression
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NOVA Explorer - How to Use
Expression management
Save an expression and share it with other users :
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View Management
NOVA Explorer - How to Use
View management
Save all your working environment in a view
Create a new
view or save an
existing one
All filters are saved:
– Date & time : absolute or relative
– Selected regions and interfaces
– Subscriber search
– Complete expression
All panels layout are saved:
– Panels position and size
– Selected columns and display order
– Columns width, frozen
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NOVA Explorer - How to Use
View management
Save your own views and share them in the homepage:
– Share knowledge & best practices
– Fast access to recurrent searches / use cases
Operations on
selected view:
• Open
• Launch
• Share
• Delete
Fast access to
my views and
the views
shared by
other users
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NOVA Explorer - How to Use
View management
Filters can be performed on:
– My views
– Shared views
– All views
My view selected
Search tool to select quickly specific views:
Search for views
containing
keyword “Issues”
in title or
description
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Call Traces
NOVA Explorer - How to Use
Call Trace (1/2)
Call Trace feature gives access in a single built-in window to :
1
Call flow
3
Detailed decoding
2
Toggle Call Flow / Frames
listing
4
Status panel
5
Call Trace export
2
3
1
4
5
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NOVA Explorer - How to Use
Call Trace (2/2)
2
1
5
3
4
1 Call flow
21 Frames listing
3 Detailed decoding
4 Call Trace export
5
Radio Measurements
(RAN Only)
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NOVA Explorer - How to Use
Call Trace Multi-Interfaces
Extends simple Call Trace :
– Correlations to retrieve additional user activity :
– CDR with same IMSI/MSISDN
– Time Range
– CDR matching Exfo correlation algorithm
– Not available for Data Services interfaces
duration
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NOVA Explorer - How to Use
Call Trace Radio Measurements (RAN Only)
Radio Measurements feature is used to assess radio conditions as experienced by customers
Prerequisites: Radio Measurements will be available from Call Trace window
Categories available appear in a Combo Box
In configuration file, it is possible to configure:
• Available categories
• Categories by default (displayed when the Call Trace window is opened)
• Color and label of the metrics
© 2017 EXFO Inc. All rights reserved.
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NOVA Explorer - How to Use
Call Trace Export
Call Trace can be exported from:
– xDR grid (same rules as Call Trace for multi-interface)
– Call Trace Window
Multiple formats are available:
- Text for message content
- CSV for Messages
- PCAP containing all frames
- HTML including all content of
Call Trace window
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NOVA Explorer - How to Use
Call Trace HTML Export
Complete export of Call Trace in HTML format including:
–
–
–
Flowchart
Frame List with search tool for filtering displayed frames
Decoding window with possibility to search for parameters inside the messages
Filtering frames
inside the grid
Searching for
parameters inside
messages
Flowchart
Frame Grid
Useful to exchange information with
infrastructure vendors
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Administration
NOVA Explorer - Access & Rights
User profiles
Several profiles to suit all user types
Rights
Super User
User
Userid
User Privacy
Access to application
X
X
X
X
Advanced usage
X
Delete database
X
Visualize SMS/MMS
X
X
Visualize USSD
X
X
X
Visualize IMEI
X
X
X
Visualize IMSI
X
X
X
Visualize MSISDN/Number
X
X
X
Visualize User Plane data
X
X
Decode UP
X
X
Export CP
X
X
Export UP
X
X
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NOVA Explorer - Access & Rights
User profiles
Access to application
•Quick search
•Subscriber Activity Search
•Filtering (except for Privacy fields)
•Share and Load views and filters
- Distribution
- Call Trace CP (privacy information hidden
Advanced usage
•Use NEx with full permissions, including Full search
Visualize SMS/MMS
• See the content of SMS and MMS (Activity grid / Decoding)
Visualize USSD
•Display the USSD service data (Activity grid / Decoding)
Visualize IMEI
•See the complete IMEI mobile identity (Activity grid / Decoding)
Visualize IMSI (Privacy option)
•See the complete IMSI subscriber identity (Activity grid / Decoding) and estimated geolocation CDR coordinates (Activity grid and Geolocation Map)
Visualize MSISDN
•See the complete MSISDN number (Activity grid / Decoding)
Export PCAP CP
• Export control plane data to a PCAP format
Access to Subscriber Activity
•Carry out a search from a subscriber’s identity
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NOVA Explorer - Access & Rights
User privacy
Restricted access to application :
Sensitive information (IMSI, MSISDN, IMEI, USSD, SMS/MMS, hostnames) are hidden
Data grid :
Detailed decoding :
Barred PCAP/text export
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NOVA Explorer - Access & Rights
Portal mode
Single Sign On on Portal with your user account, then direct access to Nova
Explorer (or any other Exfo application)
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NOVA Explorer - Access & Rights
Standalone mode
Standalone mode = Nova Explorer not registered in Exfo portal
4 pre-defined users: superuser, user, userid, userprivacy (with previously presented profiles)
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NOVA Explorer - Access & Rights
User Security Access
Default : all operations are logged (visible by admin in Manager)
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NOVA Explorer - Access & Rights
User Security Access
Security popup to log specific user activities (on login / search on IMSI) :
(Option disabled by default)
In addition to the reason specified in the text area, categories can be configured:
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Best Practices
NOVA Explorer – Best practices
Major guidelines for getting best performances (1/2)
1. Rather work as often as possible on one hour only (search, distribution)
2. Make a distribution on a subset : prepare the filter expression using « add to expression » then run your
distribution directly (without applying the filter and launching a new search before).
3. Use « add to expression » instead of double-clicking directly in the grid to add a new expression. Only once the
desired expression is complete, start the search.
4. To make a search on IMSI or MSISDN, use « Subscriber Activity Search » on the Filter panel.
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NOVA Explorer – Best practices
Major guidelines for getting best performances (2/2)
5. Select only the needed interfaces or protocols.
6. Customize your displayed columns in order to display the most used columns only.
7. Limit the search/distribution to the concerned region(s) when possible.
8. When performing a Multi Interface Call Trace, select the necessary interfaces only (avoid a systematic check
of all interfaces)
9. Call Trace launch should be limited to the necessary CDRs and period of time, to optimize display duration
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UP Specifics
NOVA Explorer - UP troubleshoot
Display eSDRs
To Display eSDRs in Nova Explorer.
Select Global Activity
Select the BigData region.
Select eSDR in the interface tab.
Interface filtering can be done using the “First interface/Last interface” columns
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NOVA Explorer - UP troubleshoot
Display VideoDRs
To Display VideoDRs in Nova Explorer.
Select Global Activity
Select the BigData region.
Select VideoDR in the interface tab.
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NOVA Explorer - UP troubleshoot
Call Trace UP - Overview
Call traces, call flows and details decoding are not availble for Data Services (eSDR / VDR)
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RAN Specifics
Geolocation
Geolocation feature is used to troubleshoot CDRs through the display of mobile start and end positions and cell
geographic locations on a map.
Prerequisites: At least one CDR is highlighted in the Activity grid
Two types of elements are displayed on the map: cells and mobiles.
Geolocation can be used in two different modes
– Geolocate selected
– All grid gelolocation
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Geolocate selected (1/4)
Geolocate selected mode is single-CDR mode.
Geolocation is launched for CDR that is currently highlighted in the grid:
– If available, focusing on geographic information
– Providing CDRs details (cells; start positions of CDR; end positions of CDR; etc.)
Once launched, each time a new CDR is highlighted in the grid, the map adapts dynamically displayed content as if a new
single-CDR geolocation was launched.
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Geolocated selected (2/4)
Geolocation is able to accurately locate the start and end location of the subscriber and also start
cell and end cell of the selected CDR.
Start Cell
End Cell
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Geolocate selected (3/4)
Subscribers positions depend on estimated geolocation information.
Accurate localization of the subscriber will help to troubleshoot user failures.
Start position
End position
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Geolocate selected (4/4)
In 3G Calls, Multipoint Geo Location is available.
It is possible to see the evolution of subscriber position along the call.
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Multi-CDR mode Geolocation (1/2)
When selecting « Geolocate all grid », the multi-CDR mode geolocation mode is launched.
Geolocation of all CDRs (last Search) listed in the Activity grid:
– Locates and displays all CDRs and cells (geographic distribution)
– Applies a colorization based on user-defined criterion
Once launched, each time a new CDR is highlighted in the grid, a zoom applies on the corresponding map location and a
popup opens about related CDR.
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Multi-CDR mode Geolocation (2/2)
Two types of elements are displayed on the map: the triangles represent cells and the squares
represent mobile positions.
When selecting a cell or a mobile position, a brief summary of selected geolocation metric is diplayed.
One cell triangle representation can refer to multiple carriers. In order to display details, the cell has to be
selected.
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Geolocation map options
Layer panel is used to define base layer and also overlays of the map.
Map base layer can be ;
– Mapnik
– Cycle Map
– Transport Map
Map overlays can be:
– Cells
– Cell clusters: Cells may not be visible while zooming out. A cluster strategy is linked to those cells that
aggregates positions while zooming in or out.
– Mobiles
– Mobile clusters: As squares are very small, they are not visible while zooming out. A cluster strategy is
linked to those squares that aggregates positions while zooming in or out.
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Geolocation map types
Mapnik
Cycle Map
Transport Map
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Geolocation metrics 2G
Different metrics are defined for both cell and mobile position levels:
Number of CDR
Number of dropped CDR
Cell Analysis
Number of blocked CDR
Distinct IMSIs
Tiles Analysis
CDR duration (ms)
Rx Level (dBm)
Rx Quality
Last RHS
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2G coverage plot
RxLev plot
Last RHS plot
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3G Geolocation metrics
Different metrics are defined for both cell and mobile position levels:
Number of CDR
Number of dropped CDR
Cell Analysis
Number of blocked CDR
Downlink Volume (bytes
Uplink Volume (bytes)
Tiles Analysis
Last RSCP(dBm)
Last Ec/No (dB)
Distinct IMSIs
Data bitrate UL (Kbps)
Data bitrate DL (Kbps)
CS RAB duration (ms)
CDR duration (ms)
Last RHS
77
3G coverage plot
RSCP plot
Ec/No plot
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4G Geolocation metrics
Different metrics are defined for both cell and mobile position levels:
Number of CDR
Number of dropped CDR
Cell Analysis
Number of blocked CDR
Downlink Volume (bytes
Uplink Volume (bytes)
Tiles Analysis
Last RSRP (dBm)
Last RSRQ (dB)
Distinct IMSIs
Data bitrate UL (Kbps)
Data bitrate DL (Kbps)
CDR duration (ms)
Last RHS
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4G coverage plot
RSRP plot
RSRQ plot
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Exercices
© 2018 EXFO Inc. All rights reserved.
81
Exercices
EPC
NOVA Explorer
Exercises (1/4)
Exercise 1: (Filters and Distribution)
1) Filter on S1 interface with time between 18h and 20h.
(for any day with CDR)
2) Filter on all Attach procedures.
3) Display Attach CDRs in failure.
4) Filter on Attach failure CDRs issued by « Core Network ».
5) Give the top 3 main causes for Attach failure.
6) Give the top 5 most impacted subscribers.
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NOVA Explorer
Exercises (2/4)
Exercise 2: (Creation of expression AND & OR )
1)
Filter on S1 interface.
2)
Filter on Successful Attach procedures.
3)
Filter on Failed PDN connectivity procedures.
4)
Filter on Failed Tracking Area update procedure with Core Issue.
5)
Expression 1:
Display Successful Attach procedures or failed Tracking update or failed PDN
connectivity procedures.
6)
Expression 2:
Display Successful Attach procedures or failed Tracking update or failed PDN
connectivity procedures issued by only Core and Radio.
84
NOVA Explorer
Exercises (3/4)
Exercise 3: (Multiple Distribution)
1) Filter on S1 Interface
2) Display the percentage for successful and failed activities for Attach requests.
3) Display the percentage for successful and failed activities issued by core,
radio, internal and UE for PDN Connectivity requests.
4) Display the EMM and ESM cause of failures for Attach/Service Requests.
85
NOVA Explorer
Exercises (4/4)
Exercise 4: (UP troubleshoot)
1) Using eSDRs, find the top 3 home operators of inbound roamers (in terms of UP
activity) seen over the last 24 hours
2) Calculate the HTTP GET efficiency using eSDRs.
86
Exercices
correction
NOVA Explorer
Exercise 1: Questions
Exercise 1: (Filters & Distribution)
1) Filter on S1 interface with time between 18h and 20h.
(for any day with CDR)
2) Filter in all Attach procedures.
3) Display the Attach failed CDR.
4) Filter in Attach failed CDR issued by « Core Network ».
5) Give the top 3 main causes for Attach failure.
6) Give the top 5 most impacted subscribers.
88
NOVA Explorer
Exercise 1: Answers (1/6)
Question 1:
In “Date & Time” panel, set “Start
hour” and “End hour” criteria.
In Interfaces panel, choose :
• Signaling for xDR type
• S1 for interface
89
NOVA Explorer
Exercise 1: Answers (2/6)
Question 2:
In grid view, click on any cell in “Type” column.
In the expression bar, select s1-type-attach and add an expression
Check that your expression was correctly added :
In Grid view, you now have only CDR with
type value ‘s1-type-attach’
90
NOVA Explorer
Exercise 1: Answers (3/6)
Question 3:
Continue with results from question 2
In grid view, click on any cell in “Result” column.
In the expression bar, select ‘result-not-ok’ and add an expression
Check that your filter was correctly added to the previous filter :
In Grid view, you now have only CDR with
type value ‘s1-type-attach’ and result value
‘result-not-ok’
91
NOVA Explorer
Exercise 1: Answers (4/6)
Question 4:
Continue with results from question 3
In grid view, click on any cell in “Root Cause” column.
In the expression bar, select ‘s1-root-cause-not-ok-core-network’ and add an expression
Check that your filter was correctly added to the previous filter :
Check the results in grid view
92
NOVA Explorer
Exercise 1: Answers (5/6)
Question 5:
Continue with results from question 3
In grid view, click on any cell in “ESM Cause” column.
Then click on ‘Distribute’
Check the results
93
NOVA Explorer
Exercise 1: Answers (6/6)
Question 6:
Continue with results from question 3
In grid view, click on any cell in “IMSI” column.
Then click on ‘Distribute’
Check the results
94
NOVA Explorer
Exercise 2: Questions
Exercise 2: (Creation of expression AND & OR )
1)
Filter on S1 interface.
2)
Filter on Sucessful Attach procedures
3)
Filter on Failed PDN connectivity procedures
4)
Filter on Failed Traking Area update procedures with Core Issue
5)
Expression 1:
Display the Successfull Attach procedure or failed Tracking update or failed PDN
connectivity procedures.
6)
Expression 2:
Display the Successful Attach or failed Tracking update or failed PDN connectivity
procedures issued by only Core and Radio.
95
NOVA Explorer
Exercise 2: Answers (1/3)
Question 1 :
96
NOVA Explorer
Exercise 2: Answers (2/3)
Question 2
Successful Attach Procedure
Question 3
Failed PDN Connectivity
Question 4
Failed Tracking Area update with Core Network issues
97
NOVA Explorer
Exercise 2: Answers (3/3)
Expression 1:
Expression 2:
98
NOVA Explorer
Exercise 3: Questions
Exercise 3: (Multi Distribution)
1) Filter on S1 Interface
2) Display the percentage for successful and failed activities for Attach requests.
3) Display the percentage for successful and failed activities issued by core,
radio, internal and UE for PDN Connectivity requests.
4) Display the EMM and ESM cause of failures for Attach/Service Requests
99
NOVA Explorer
Exercise 3: Answers (1/3)
Question 2 :
Compose a filter on Type column (‘s1-type-attach’)
Then click on any cell in ‘Result’ column
Launch a simple distribution
Check the results
100
NOVA Explorer
Exercise 3: Answers (2/3)
Question 3 :
Compose a filter on Type column (‘s1-type-pdn-connectivity’) and Result column (‘result-not-ok’)
Then click on any cell in ‘Root Cause’ column
Launch a simple distribution
Check the results
101
NOVA Explorer
Exercise 3: Answers (3/3)
Question 4 :
Compose an expression with OR filter on Type column (‘s1-type-attach’ OR ‘s1-type-service-request’).
Click on any cell in ‘EMM Cause’
column, then launch a distribution
on several columns, and add ‘ESM
Cause’ field.
Check the results
102
NOVA Explorer
Exercise 4: Questions
Exercise 4: (UP troubleshoot)
1.
Using eSDR, find the top 3 home operators of inbound roamers (in terms of UP activity) seen
over the last 24 hours
2.
Calculate the HTTP GET efficiency in eSDR ?
103
NOVA Explorer
Exercise 4: Answers
Question 1 :
Using eSDR, calculate the number of subscribers seen over 24 hours
Open Nex and display the eSDR (Region = BigData, Interface = ‘empty’, check ‘eSDR’). Filter on Roaming
Type = Inbound, and make a double distribution on MCC and MNC to retrieve the top 3 operators.
Calculate the HTTP GET efficiency in eSDR ?
To calculate the HTTP efficiency, we will use the HTTP result code of the HTTP sessions:
a) Filter on HTTP service.
b) make a distribution over the « #resp GET cause 2xx » for all technologies (GERAN,
UTRAN, EUTRAN, MOBILITY, OTHER) and calculate the sum.
c) make a distribution over the « #req received » for all technologies and calculate the
sum.
d) Calculate the ratio of « #resp GET cause 2xx » / « #req received »
104
Exercises
Core-CS
105
Nova Explorer
Exercise 1
•
Display Core CS CDRs
•
Focus on MAP protocol
•
Which are the main procedures for this protocol ?
•
Display only CDRs with failures
•
Focus on the main cause of the failures and display a call flow
106
Nova Explorer
Exercise 2
•
Focus on BICC protocol
•
Display only CDR in communication
•
Which the couple of node have the highest number of drop
•
Decode one CDR and find the reject cause
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Nova Explorer
Exercise 3
•
Display SIP protocol CDRs for the last hour
•
Apply a filter to exclude SIP OPTIONS procedures.
•
Use the distribution function to display the repartition of SIP procedures.
•
Focus on REGISTER procedure and check how they finish (Last Event column).
•
Display the call MI of a procedure with last event =200 OK.
•
Export the call trace (pcap and image)
•
With the decoding of the 200 OK message, check the associated URIs and the value of Expire
•
Is there some Re-Registrations?
•
Display the main cause of REGISTER procedure failures
•
Check the activity panel.
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Nova Explorer
Exercise 4
•
Which IMS services/applications are implemented?
•
Focus on Voice IP Call Service.
•
Save the view and share it with all users.
•
How can we distinguish VoLTE service and Voice over ADSL? (PANI)
•
Which handset types are mainly used for VoLTE?
•
Display the calls with session duration >0. What comment can be done (Bye procedure, calls which
reached the comm).
•
Display the call trace MI (include S1 interface) of one of them
•
Diplay the Video IP Call CDRs.
•
Check the SDP parameters of the invite message.
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Nova Explorer
Exercise 6
•
Display the SIP CDRs for the last hour.
•
Focus on the CDRs with IMSI not null and select one of these IMSI.
•
Use the « Subscriber Activity search” function to display for the last hour all the CDRs for this
subscriber.
•
Tick all the CDRs and launch the call trace.
•
Export them to pcap.
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Exercises
RAN
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NOVA Explorer
Exercises
Exercise 1: (Filters and Distribution)
1) Filter on Infrastructure CT 3G interface with time between 18h and 20h.
(for any day with CDR)
2) Filter on all voice calls.
3) Display dropped voice calls.
4) Give the top 3 main standard causes for dropped voice calls.
5) Give the top 5 most impacted subscribers.
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NOVA Explorer
Exercises
Exercise 2: (Creation of expression AND & OR )
1)
Filter on Infrastructure CT 3G interface with time between 18h and 20h.
2)
Filter on Successful voice calls.
3)
Filter on Failed LA/RA updates.
4)
Filter on blocked data sessions.
5)
Expression 1:
Display Successful voice calls procedures or failed LA/RA updates or blocked data
sessions.
6)
Expression 2:
Display Successful voice calls procedures or failed LA/RA updates or blocked data
sessions due to failure in the Radio interface procedure and due to congestion.
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NOVA Explorer
Exercises
Exercise 3: (Multiple Distribution)
1) Filter on Infrastructure CT 3G interface with time between 18h and 20h.
2) Display the percentage for successful and failed data sessions connectivity.
3) Among failed data sessions display percentage of blocked and dropped
connections.
4) Display the standard and internal causes of data sessions drops.
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NOVA Explorer
Exercises
Exercise 4: (Geolocation)
1) Filter on Infrastructure CT 3G interface with time between 18h and 20h (use
full search).
2) Filter on all data sessions.
3) Display dropped data sessions.
4) Filter on worst RNC and then on worst cell within this RNC.
5) Display CDR geographical distribution.
6) Display Coverage plot for cell in question.
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NOVA Explorer
Exercises
Exercise 5: (Geolocation)
1) Filter on Infrastructure CT 3G interface with time between 18h and 20h.
2) Filter on all HSPA+ data sessions.
3) Display blocked sessions.
4) Filter on top worst RNC and then on worst 5 cells within this RNC.
5) Display CDR geographical distribution.
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NOVA Explorer
Exercises
Exercise 6: (Call Trace and Radio Measurements)
1) Filter on Infrastructure CT 3G interface with last 24h
2) Filter on Type = Dropped and End RSCP (dBm) != NULL
3) Display Call Trace
4) Display Categories: Coverage, Quality, User Distance and 3G Frequency
5) In Activity window, search Frames which contain ‘measurement’
6) Click on a message and check that a vertical line appears in the Radio
Measurement Charts in the related timestamp
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Thank you!