7 Practice Iub V4.2 May2008 RB

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Practice : Activity Analysis & Practice : Activity Analysis & Cigale View - Cigale IubCigale View - Cigale Iub

ORANGE SPAIN 11/03/2009ORANGE SPAIN 11/03/2009

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Astellia confidential

• Practice»Activity Analysis and Cigale View

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Iub Activity AnalysisIub Activity Analysis

• Exercise 1 : Start event. Call flow in detailled activity and flow chart» In the activity report table, display the Start Event column

distribution. Make sure to understand all types of procedures» Select a CDR and use the automatic link to the detailed activity

and the flow chart to understand the relation between the call flow, the start event, the last event, last cause and final state. Check synchronisation of DA and flow chart windows

» Filter-in Outgoing/Terminating Conversational connections by using OR filter (+) on Start Event column

» Filter on « partial capt. column » to keep only “full” connexions. Make sure you understand this action.

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• Exercise 2 : Filtering on specific fields of the connection» In activity report table, apply the adapted filter to keep only

conversational call which had a duration of at least 40 s and are flagged as “full”

» Then, apply the adapted filter to keep only calls finishing with a cause different from “Normal”. Then display the distribution of the last cause column. Make sure you understand the causes.

» Open a new activity report table and filter-in the incoming calls received by the german roamers (IMSI 262*). Display the last cause column distribution.

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• Exercise 3 : active set follow-up» In the activity report table, apply the adapted filter to keep only

the calls with a high mobility (more than 15 visited cells)

» Select a CDR and display the detailled activity; display the « Network Element » column to visualise all visited active sets

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• Exercise 4 : Filtering on « radio bearer » fields -1» In the activity report table, find out, among the dropped

connections, « fully captured », the one with the most important mean UL BLER, with a minimum of 5 Mbits of data transferred in UL

» Find out how the call finished. Display the UL radio throughput for data in the graph. Assess the overall radio quality.

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• Exercise 5 : Filtering on « radio bearer » fields - 2

» In the activity report table, find out, among the connections with a minimum of 6 Mbits of data transferred in DL, « fully captured », the one with the most important RLC DL retransmission rate.

» Display the graph of radio and RLC volume transmitted in DL and in UL

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• Exercise 6 : 3G2G Handovers - 1» In activity report table, find a connection which terminates with a

HOFromUTRANCmd » Analyze in the detailed activity the various steps before this

message was sent: measurement reports, compressed mode, …

» Using the decoding option, look at the information contained in the measurement control about the various thresholds set for the inter-system handovers

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• Exercise 7 : 3G2G Handovers - 2» Sort the connections by decreasing order of the number of

compressed mode» Filter-in the connections which do not terminate with a handover

to 2G (no HOFromUTRANCmd in the last event column)» Analyze in the detailed activity the successive compressed

mode switching and explain the reason for the failure in handover.

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• Exercise 8 : RRC mode switching » Look-up for a connection with PS service which transmitted a

minimum volume of 10 Mbit in UL

» Look for and count how many times the UE switches from CELL_DCH to CELL_FACH by filtering in detailed activity on column Event RRC and using the extension _CELL_FACH

» Look for the various steps of a switch CELL_DCH CELL_FACH and CELL_FACH CELL_DCH in using the 2 following methods:

- Starting from the previous filtering, select a line, “lock” the filter on the connection and click on the “big red arrow” button.

- Or remove the previous filtering and look for the first switch thanks to the “find next value” function.

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• Exercise 9 : RB reconfiguration

» Look for a connection with PS service which transmitted a minimal uplink radio volume of 10 Mbits and with RB downgrades: display the detailed activity

» Launch the radio measurement graph window and display the UL DATA Radio Throughput. Select an event indicating a RB downgrade and pay attention to the correlation with the throughput graph

» Find these events in the detailed activity thanks to the synchronization graph/detailed activity.

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• Exercise 10 : connection setup time

» In table « timers > counters », filter on time counter “Stage1Succ” that measures the RRC connection setup time

» Sort the connections by decreasing order of this timer.» Examine the detailed activity of the 5 connection with the longest

setup time to understand the reason.

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• Exercise 11 : active set update procedure time

» In table « timers > counters », filter on time counter “ASU_Add_Rem_To_ASUC_duration” which measures the time between the active set update (Add and Remove) and the active set update complete

» Sort the connections by decreasing order of this timer.» Examine the detailed activity of the connection with the longest

duration to understand the reason.

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• Exercise 12 : Analyse High SHO zones» In activity report table, sort the CDR by decreasing order of the

Nb SHO column and look at the Nb visited Cell column.» Analyze the cases with the smallest numbers of visited cells*» Look at the active set evolution» In the detailed activity, filter on ASUdateCmp and make a

distribution on Complementary column to check if a cell is not more often than others concerned by ping-pong.

» Look at the Ec/No levels of AS cells.» Compare them with the SHO parameters (can be retrieved from

the Meas Control setup)

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• Exercise 13 : HSDPA Serving cell

» In activity report table, sort the CDR by decreasing order of the Number of Serving cell change column and look at the Nb visited Cell column.

» Analyze the cases with the smallest numbers of visited cells*» Look at the impact of these changes on throughput evolution

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• Exercise 14 : NBAP Failure Indication

» The previous exercise may have point out some problem of NBAP RL failure indication. You can try to find out with the SIR target or SIR the mechanism leading to this failure (SIR is low, but maybe not obvious on all UTRAN)

» In order to find cell with problem, in a detailled activity, filter in all NBAP_RLFailIndic, make a distribution on Complementary, found the more concerned cells (potentially an intervention on this cell is required)

» Come back from this filtering to the CDR and analyze which type of CDR is more impacted

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• Exercise 15 : HSUPA Indicator» Select HSUPA CDR (full capture)» Sort First Trans success indicator in decreasing order» Display on a graph, this indicator and the number of Average HARQ

retransmission» Try to find some correlation with other UL indicators (RSCP, ECNO,

SIR target, UL Sig in DA…)» If you know the procedure used by your UTRAN, find out the criteria

used to act on HSUPA procedure, and what is done : HARQ is a faster system for retransmission that allows high throughput with less radio bandwidth usage (useless to guarantee 100% first trans success)

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• Exercise 16 : Make a presetMake a preset selecting : » The connections for which the column Part. Capt says “full”.» The AMR calls with a minimum of 100 Kbit of DATA radio volume

transmitted in UL.» The drops with causes different from « normal » and events

different from HOFromUTRANCmd

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View Iub – connection efficiencyView Iub – connection efficiency

• Exercise 17 : RRC connection setup

» In Cigale View, determine the cell with the highest inefficiency rate (all types) with a minimum of 100 attempts.

» In Activity Analysis, find the concerned connections and determine the Ec/No values at the time of the RRC connection request

» Determine how many different TMSI are impacted.

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• Exercise 18 : Drops in Cell_DCH

» Find the cell with the highest drop rate with a minimum of 100 attempts.

» Determine the main drop “category”

» Determine the active set configurations (active set option) containing this cell.

» With Activity Analysis find the concerned connections and determine if the drops are more related to the bad radio environment or to system problems.

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• Exercise 19 : Compressed mode and inter-system handovers

» In the “compressed mode …”, highlight the cells with a minimum of 30 switches to compressed mode

» Find the cell for which the rate between the number of HOFromUTRANcmd and the number of compressed mode switches is the smallest (2G_HOto_CM_rate)

» Determine in which active set the cell is located in main cases of compressed mode switches

» Find and analyse some cases in Activity Analysis

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View Iub – Radio measurementView Iub – Radio measurement

• Exercise 20 : UL BLER per cell

» In the Radio measurements graph, select the cell with a minimum of 1000 UL BLER reports and the highest average UL BLER

» Visualize the UL BLER for the various active set where this cell have been

» In Activity Analysis activity reports, find the RB established on this cell and analyse the radio environment of the call with the highest UL BLER

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View Iub – TimersView Iub – Timers

• Exercise 21 : RRC connection setup time (counter Stage1Succ)

» Determine the minimum and maximum times associated to this counter among the cells on which at least 50 connections were setup.

» Determine the 3 cells with the highest setup time

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View Iub – NeighborsView Iub – Neighbors

• Exercise 22 : active set life duration

» Determine the 2 cells active sets with the shortest lifetime and a minimum of 100 occurrences.

» In Activity Analysis, the concerned connections could be found again with the method described in Exercise 12, or more precisely, by filtering in the detailed activity.

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View : 3G NeighborsView : 3G Neighbors

• Exercise 23 : Looking for undeclared 3G cells

» Prerequesite: 3G neighbor file must be set as input of cigale Iub

» Find in the 3G Neighbor cells per couple statistics, undeclared candidates with a non negligible occurrences weigth (>2%)

» In Activity Analysis, look for calls taking place on these cells

» Thanks to the OnMapDisplay, localise these cells and try to find out if they effectively should be declared as neighbours.

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• Exercise 24 : Looking for street corner effect

» Find in the 3G Neighbor cells per couple statistics, couples where the l’Average Ec/No < 0 with a significant number of cases.

» In Activity Analysis, look for calls taking place on these cells

» Thanks to the OnMapDisplay, localise these cells and try to find out where the street corner effect can take place

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• Exercise 25 : Looking for undeclared 2G cells

» Prerequesite: 2G neighbor file must be set as input of cigale Iub

» Find in the 2G Neighbor cells per 3G/2G couple statistics, undeclared candidates with a non negligible occurrences weigth (>2%)

» In Activity Analysis, look for calls taking place on these cells (3G cell in network elements or 2G cell as target)

» Thanks to the OnMapDisplay, localise these cells and try to find out if they effectively should be declared as neighbours.

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View Iub – Cells MetricsView Iub – Cells Metrics

• Exercise 26 : Looking for problematic cells

» In CSE1 RRC Connection setup inefficiency, sort the cells by decreasing order of failures.

» Taking cells with the highest failure rates, look in ECN4-RRC connection setup success rate versus Ec/No the shape of the curve and compare it with the global shape for the RNC.

» Analyze other statistics in Cell Metrics, in particular, statistics ECN1 and ECN2.

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View Iub – Cells Metrics and quantilesView Iub – Cells Metrics and quantiles

• Exercise 27 : Analysing cells with a bad RRC Connection Setup success rate and good Ec/No

» In statistics Q3, look for cells with a high RRC connection setup failure rate for relatively good Ec/No (for one Ec/no, we read x% of failure take place for smaller Ec/No. It is then better to have 100% for Ec/No < -5)

» Go to the stats ECN4 to display the complete repartition (and check if the number of CRini is great)

» For the worst cells, check in CSE1 the types of connections and the failure causes.

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View Iub – HSPA StatisticsView Iub – HSPA Statistics

• Exercise 28 : Find Out cell carrying more HSDPA CDR

» In View HSP6, display in decreasing order for all cells the number of CDR

» For the cells try to see in RM1 and HSDPA Radio throughput the average radio throughput for HSDPA on these cells

» Redo Step 1 in HSDP7 for HSUPA

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View Iub – ReportingView Iub – Reporting

• Exercise 29 : Creating a report :

a chapter with 3 levels including:» A level “RRC connection setup detailled indicator” at the RNC

level» A level “RRC connection setup inefficiency” at RNC level for

the cells with a minimum of 200 initiated connections.» A level “RRC connection setup inefficiency” at the cell level

which applies to the 10 first cells of the previous presentation.

In all these chapters should be used the contextual criteria, selecting the call type “all connections”

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View Iub – MyViewView Iub – MyView

• Exercise 30 : creating a MyView base.

Create a MyView base with a file including:- A presentation of the connection efficiency domain- A presentation of the RNS efficiency domain - A presentation of the Radio measurements domain

Include the adapted filters to highlight the problematic cells

7 Practice Iub V4.2 May2008 RB

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