atoll 3.1.2 gsm gprs edge advanced

5/28/2018 Atoll 3.1.2 Gsm Gprs Edge Advanced

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GSM/GPRS/EDGE Advanced FeaturesAtoll 3.1.2

Forsk 2012 Confidentia lDo not share without prior permission Slide 1


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1. Advanced Modelling of Multi-Band Transmitters

2. Traffic Modelling

3. Network Dimensioning

4. KPIs Estimation

Forsk 2012 Slide 2ConfidentialDo not s hare without prior permission

Training Programme


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Advanced Modelling of Multi-Band TXs

Default Modelling of Dual Band TX

Activation of the Advanced Modelling of Multi-Band TX Feature

Atoll Specific Interface



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Default Modelling of Dual-Bands TX

Possibility to Define Cell Types Having Several Frequency Bands

GSM900/1800 Concentric Cells

Common Antenna and

Propagation (model,

resolution and radius)

Settings for all the Subcells

of the transmitter

BCCH Frequency Band for

all the Subcells of the

transmitter used by the

propagation model

Definition of Domains located in

different Frequency Bands.

Possibility to model thePropagation Offset by a constant

power offset in the Subcells

Allocation of Channels

belonging to the related

Frequency Domains



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Activation of the Advanced Modelling of Multi-Band TX

Feature

Introduction of an ATOLL.INI File in the Atoll Installation Directory

To turn on the Multi-Band modelling feature, add the following lines in the Atoll.ini file:

[Studies]

MultiBandManagement = 1

Evolution in Atoll Interface

New Button in the TRX tab of the Transmitter Property Dialogue

New Table in the Subcell part of the Transmitter folder context menu



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TRX Tab of the Transmitter Property Dialogue

All the Subcells having a Frequency

Domain included in the Frequency Band

of the BCCH have the default transmitter

settings (Antenna and Propagation

model settings)

The Subcells having a Frequency Domain

not part of the BCCH Frequency band

can have specific Propagation settings(Antenna and Propagation model)



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TRX Tab of the Transmitter Property Dialogue

Specific Antenna and Equipment Settings

for the frequency band 1800 MHz

(compared to the default 900 MHz in the

current transmitter)

Specific Propagation Model Settings for

the frequency band 1800 MHz Forsk 2012 Confidentia lDo not share without prior permission Slide 7


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New Table in the Subcell Entry

Default 900 MHz settings defined in the

Transmitter and Propagation Tab of the

Transmitter Property Dialogue

Specific 1800 MHz settings (Antenna,

Equipment and Propagation Settings) Forsk 2012 Confidentia lDo not share without prior permission Slide 8


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4. KPIs Estimation


Training Programme


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GSM/GPRS/EDGE Traffic Modelling

Overview

Multi-Service Traffic Data

Traffic Map Management

Traffic Analysis



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Overview

Modelling the Multi-Service Traffic Data

Creation of Different Kinds of Traffic Maps

Based on marketing data or live traffic

Traffic Analysis

Traffic distribution between transmitters and HCS layers that will be used as input of the dimensioning



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Multi-Service Traffic Data (1)

Management from the GSM/GPRS/EDGE Folder of the Data Tab

Description of Services, Terminals, Mobility types

Description of User Profiles and Environments

Information used in some traffic maps



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Service Properties

Indication of the type of service

Circuit or packet switched service

Different parameters according to the type of service

For Circuit-Switched Services

Maximum permissible

blocking rate stated in

Erlang B or C



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Service Properties

For Packet-Switched Services

Probability to have delayed packet arrivals and

maximum permissible delay

Minimum and maximum numbers of timeslots

allowed to be multiplexed per user for that

particular service

Minimum required throughput with a

percentage of coverage that should at least be

provided with this throughput

Parameters related to the Application

Throughput compared to the gross

throughput (from Coding schemes).



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Mobility Type Properties

Used to distribute traffic

between HCS layers



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Terminal Properties

GSM Terminal

Frequency bands and

technology compatible

with the terminal.

Information used todistribute traffic between

subcells.

Codec Equipment Selection(Circuit Only)

Receiver Noise figure used in

the Interference estimations

(predictions, traffic capture)



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Terminal Properties

GSM/GPRS/EDGE Terminal

Frequency bands and

technology compatible

with the terminal.

Information used todistribute traffic between

Subcells.

Number of timeslots

the terminal can

multiplex in DL.

Codec Equipment Selection

(Circuit Only)

GPRS/EDGE Equipment

Selection (Packet Only)

Max number of coding

schemes allowed in GPRS (CS)

and EDGE (MCS)

Receiver Noise figure used in

the Interference estimations

(predictions, traffic capture) Forsk 2012 Confidentia lDo not share without prior permission Slide 17


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Traffic Map Management

Detailed information about Traffic Map Management is available in

Atoll_3.1.2_Traffic_Maps_Management.pdf

http://localhost/var/www/apps/conversion/tmp/scratch_10/Atoll_3.1.2_Traffic_Maps_Management.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_10/Atoll_3.1.2_Traffic_Maps_Management.pdf


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Traffic Analysis (1)

Purposes

To analyse the traffic from maps at the transmitter level

To use traffic analysis as basis of the dimensioning

Traffic analysis is a mandatory step before dimensioning

Means

Atoll distributes traffic from maps to each transmitter of each HCS layer according compatibility criteria

defined for :

Transmitters : Frequency bands, GPRS/EDGE configuration of GPRS/EDGE station (and Max CS/MCS)

HCS layers : Maximum speed allowed

Services : Type of service

Terminals : Technology and frequency bands supported, GPRS/EDGE equipment (and Max CS/MCS)

Mobility types : Speed

E.g.. A user with a GSM900 band mobile phone will not be allocated to a transmitter that only functions on

the DCS1800 band



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Creation of a Traffic Capture (1/2)

Command New from the Traffic analysis folder context menu

Property dialog

General tab : possibility to add some comments and to filter transmitters

Source traffic tab

Traffic

Selection of maps to be used

Optional multiplicative factor used

to increase the traffic request of the

map



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Creation of a Traffic Capture (2/2)

Property dialog

Condition tabOptions used to determine

each transmitter service area

which Atoll will distribute

traffic to

Possibility to base the packet traffic

demand in timeslots taking into

account :

- the current level of interferences I

- the receiver thermal noise N.

(Use of GPRS/EDGE equipment graphs)

Run calculations Forsk 2012 Confidentia lDo not share without prior permission Slide 21


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Outputs of a Traffic Capture

Two tabs in the Traffic capture property dialog

Results per transmitter tab : traffic distributed to each transmitter

Circuit traffic

demand (Erlangs and

circuit timeslots) on

each Tx service area

Packet traffic demand

(kbps and packet

timeslots) on each Tx

service area

Average

throughput carried

by a packet

timeslot on each Tx

service area



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Outputs of a Traffic Capture

Two tabs in the Traffic capture property dialog

Results per subcell tab : details of the distributed traffic per subcell, service, terminal and mobility

Number of timeslots to be

used to match the traffic

demand

Type of traffic

Circuit and packet traffic

demand



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Applications of Traffic Analysis

A traffic capture may be used as the default traffic distribution

Taken into account in coverage study reports and neighbour allocation

Calculations of dimensioning and Key Performance Indicators are performed from a traffic capture



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4. KPIs Estimation


Training Programme


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Network Dimensioning

Overview

Dimensioning Model Management

Timeslot Configurations

Dimensioning Results



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Overview

Dimensioning Algorithm

Based on a traffic capture

Using a dimensioning model

Dimensioning Model

Basis of the dimensioning and quality analysis process

Available in the GSM/EDGE parameters folder



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Dimensioning Model Management (1)

Dimensioning Model Properties (1/2)

General tab

Dimensioning options for circuit services

Queuing model (Erlang B or C)

Dimensioning options for packet services

Minimum number of dedicated packet timeslots

that can be used by the Tx

Maximum number of TRXs that can be added in

order for the subcell to fulfil the packet traffic

demand

Key Performance Indicators to be fulfilled

Variations of throughput, blocking rate and delay

with the load.

Used for the packet traffic dimensioning when

corresponding KPIs are taken into account.

Global value used when no specific value isdefined per transmitter



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Dimensioning Model Management (2)

Dimensioning Model Properties (2/2)

Quality charts tab

Quality charts used for the dimensioning

process of packet traffic

Throughput reduction factor = f(load)Delay = f(load)

Blocking probability = f(load)

Ratio of the number

of packet timeslots

available to the

number of timeslots

per packet connection



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Timeslot Configurations

Distribution of circuit, shared and packet timeslots on each TRX of a subcell

A timeslot configuration is assigned to each subcell

Influences the dimensioning result



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Dimensioning Results (1)

Dimensioning Calculation

Command Dimensioning from the context menu of a traffic analysis

1. Select the dimensioning

model to be used

3. Start dimensioning

calculation

2. Selection of columns to be

displayed in the result table

4. Check the dimensioning

results

5. Commit dimensioning

results to subcells



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Dimensioning Results for each Subcell (1/2)

Main dimensioning results

Number of required TRXs

Number of required packet, shared and circuit timeslots

Traffic load

Average occupancy of TRXs

Network settings

Maximum number of TRXs

Maximum rate of traffic overflow

Half rate traffic ratio

Traffic capture results

Packet and circuit traffic demand

Average demand in packet and circuit timeslots

Average number of packet and circuit timeslots per connection



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Dimensioning Results for each Subcell (2/2)

Additional dimensioning results

For circuit services

Served circuit traffic, effective rate of traffic overflow and effective blocking rate

For packet services

Served packet traffic, effective rate of traffic overflow, minimum throughput reduction factor and KPIs

(throughput reduction factor, delay, blocking rate)

Transmitters are displayed in red when the required number of TRXs exceeds the maximum number of

TRXs per transmitter

Some Dimensioning Results May Be Committed to Subcells



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4. KPIs Estimation


Training Programme


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KPIs Calculation

Overview

Running KPIs

KPIs Results



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Overview

Tool to Analyse KPIs of a Planned Network

Based on a traffic capture

Using a dimensioning model

KPIs

For circuit traffic : effective blocking rate stated in Erlang B or Erlang C

For packet traffic : effective throughput reduction factor, delay and blocking rate

Requirements

An existing frequency plan

A calculated traffic capture

A dimensioning model



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Running KPIs

KPI Calculation

Command KPI calculation from the context menu of a traffic analysis

Same dialog as the one used for dimensioning

1. Select the dimensioning

model to be used. Atoll will use

the quality charts of the

dimensioning model in order to

calculate KPIs in case of packet

traffic.

3. Start KPI calculation

2. Selection of columns to be

displayed in the result table

4. Check the KPIs and

other results

5. Commit results to subcells


l ( )


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KPIs Results (1)

Results for each Subcell (1/2)

Network settings

Number of TRXs

Number of packet, shared and circuit timeslots

Maximum number of TRXs

Maximum rate of traffic overflow

Half rate traffic ratio

Traffic capture results

Packet and circuit traffic demand

Average demand in packet and circuit timeslots

Average number of packet and circuit timeslots per connection


KPI R l (2)


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KPIs Results (2)

Results for each Subcell (1/2)

Results of the network analysis

Traffic load

For circuit services

Served circuit traffic, effective rate of traffic overflow and effective blocking rate

For packet services

Served packet traffic, effective rate of traffic overflow, minimum throughput reduction factor and KPIs

(throughput reduction factor, delay, blocking rate)

Some Results May Be Commited in the Subcells Table

Traffic load

Effective blocking rate



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Thank you


Slid Titl


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Slide Title



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Thank you

atoll 3.1.2 gsm gprs edge advanced

Documents

gsm gprs edge advanced

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multiband modelling

propagation model forsk

propagation settings

atoll installation directoryto

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