IMSI Analysis Arieso

8/18/2019 IMSI Analysis Arieso

1/13

www.arieso.com

IMSI Analysis

Claro Brazil Workshop April 5th, 2013

Dalia Guzman


2/13

www.arieso.com

IMSI – Use Case

A VIP user has experienced a voice drop, and you have been

requested to analyse the event, in order to provide asolution...

What to do?

Copyright Arieso 2013 Commercial in Confidence


3/13

www.arieso.com

IMSI – Details & Filter for analysis

The details below are related to the voice drop. Create a filter for accordinglyfor your analysis:

• When – 02/04/2013 @ around 11.00 AM

• Use Time Period filter for April 2nd, from midnight to midnight. Please beware that in thefilter you have to use month/day/year, e.g. April 2nd is 04/02/2013.

•What – CS Drop

• Where – Since we are filtering by IMSI, there is no need to filter by region, as IMSI

normally would act on a very closed area.• However, a good practice is to choose the Geographic Area filter option“Use Bounding

Box”.

• Who – IMSI 724053908407878

• Use Subscr iber filter for above IMSI



4/13

www.arieso.com

IMSI – Individual Call Segments


We can use this analysis to find all calls that have been done by that user we want to check. It gives us some

information, like “start reason”, “completion”, “cell”, etc.

TASK – Please run th e analysis, and once y ou have the outp ut table, please identi fy relevant inform ation (IMSI,drop cal l , sector it w as connected to, the type of s ervice, and the reason for discon nection).


5/13www.arieso.comCopyright Arieso 2013 Commercial in Confidence

IMSI – Individual Call Legs with RF Conditions

We can use this analysis to find all calls that have been done by that user we want to check. It gives us some

information as previous analysis, and also RSCP, EcIo, UE Tx power for that specific call segment.

TASK – Please run the analysis, and once yo u have the o utput table, please identi fy relevant inform ation

(IMSI, drop cal l , sector it w as conn ected to, the type of s ervice, and the reason for discon nection, RSCP and

Ec/Io of the specif ic c al l segment).


6/13www.arieso.com

IMSI – Subscriber Comparison


We can use this analysis to compare the behaviour / KPIs of different IMSIs (or show the KPIs of just one), in a

period of time.

TASK – Please run th e analysis, and once you have the output table, identi fy the main KPIs for thissubsc riber. Is his Drop Rate too high? What about number of drops, during the fi l tered period, is it a high

number of drops?

This is a good analysis also to study the performance of (a) specific subscriber(s), for greater periods of time. For

example, how w as the general performance of this subscrib er during last month?

You may also know which are the offender cells by running the analysis on next page…


7/13www.arieso.comCopyright Arieso 2013 Commercial in Confidence

Inside the points folder, we can find the drop locations analysis. With this we can plot all locations for a specific IMSI for

the drops. Once we located the drops in the map, using the spider tool we can drilldown each call

TASK – You may use this analysis as well to find out if th ere are other subscr ibers experiencing dro ps in th earea (same map bou ndings o f ~1 km around the drop and apply a new fi l ter with it , removing the subs criber

and extending the Time Period for 20 days, for example). Is this an area with lot’s of drops? Or is this a single

event? What to do in each case?

IMSI – Drop Locations


8/13www.arieso.com

IMSI – Drop Locations / Call Spider


In the first tab of the spider, we can see all

properties of the call: IMSI, IMEI, start time,

service, etc.

TASK – Please run the Drop Lo cations

analysis in the Map, and o nce you have the

output, cl ick on the spider optio n at the top

of the m ap to op en Call Spider.

Once open, identi fy in th e Propert ies tab, the

IMSI, Segment Start Time, Duration , CallStart Cell and Call End Cell, Servic e, ARFCN

and Combined co des.

What was the reason of th e drop?

What other interesting inform ation do you

have in this table?


9/13

www.arieso.com



In the third tab of the spider, we can see the layer 3 analysis. In the first part, we can choose different charts to give us

information of the call, like EcIo, RSCP, troughput, events, etc.

We may be able to choose displaying the whole call or the first or last 15 seconds.


10/13

www.arieso.com

In the third tab of the spider, we can see the layer 3 analysis. In the first part, we can choose different charts to give us

information of the call, like EcIo, RSCP, troughput, events, etc. At the right side we can choose more options to show in

the chart, in this example we are showing not only the cells in active set, but also the other PSC that were measured.



11/13

www.arieso.comCopyright Arieso 2013 Commercial in Confidence


In the third tab of the spider, we can see the layer 3 analysis. In the second part, we find the layer 3 signaling of the call.

Each message could have more information, if we click the view icon.

TASK – With Call Spider open, go to layer 3 messages and identi fy where the drop m essage is. Once you identi fy

i t , cl ick on the first colum n (View) button, and this wil l open the com plete drop message.

What valuable information do you have there? What was the cel l the user was connected to before dropp ing?

What was the Ec/No, RSCP , and type of service before the drop occ urred? What was the reason for the drop ?


12/13

www.arieso.comCopyright Arieso 2013 Commercial in Confidence


Example of an open Layer 3

message, showing more

details on the event


13/13

www.arieso.com

Template suggestion


We have created a Template for IMSI analysi s , containing the above referred analysis.

The template can be found in Data Explorer > Global > Templates (UMTS) > ClaroBR > IMSI Analysis

Once you open the template, you will be prompted to include the three variables below, for analysis scope:

>> Time Period – Enter period of analysis

>> Service Group – Type of service (for example, voice, data, etc) for the drop

>> Subscriber – Enter the IMSI object of analysis

IMSI Analysis Arieso

Documents