Atoll-3-1-0-LTE-Light.pdf

8/10/2019 Atoll-3-1-0-LTE-Light.pdf

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ATOLL LTE FEATURES


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Training Programme

1. LTE Planning Overview

2. Modelling a LTE Network

3. LTE Predictions

4. Frequency and PCI Plan Analysis

5. Monte-Carlo Based Simulations

Forsk 2011 Slide 2 of 82Confidential Do not share without prior permission


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LTE Features Supported in Atoll

LTE Workflow in Atoll



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LTE Features supported in Atoll

Supports Evolved UTRA (3GPP Release 8 LTE) Networks

Various Frequency Bands

Scalable Channel Bandwidths

Resource Blocks per Channel and Sampling Frequencies

Support of TDD and FDD Frame Structures

Half-frame/Full-frame Switching Point Periodicities for TDD

Normal and Extended Cyclic Prefixes

Downlink and Uplink Control Channels and Overheads Downlink and uplink reference signals, PSS, SSS, PBCH, PDCCH, PUCCH, etc.

RSRP, RSSI and RSRQ Support in predictions and Simulations



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LTE Features supported in Atoll

Supports Evolved UTRA (3GPP Release 8 LTE) Networks

Physical Cell IDs Implementation

Inter-Cell Interference Coordination Support

Fractional Frequency Reuse Modelling

Support of Fractional Power Control (UL)

Support of Directional CPE Antennas

Signal Level Based Coverage Planning

CINR Based Coverage Planning

Possibility of Fixed Subscriber Database for Fixed Applications



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LTE Workflow in Atoll

Forsk 2011 Confidential Do not share without prior permission

Open an existing project or

create a new one

Prediction StudyReports

Traffic Maps

Network Configuration

- Add network elements

- Change parameters

User-defined

Values

Automatic or Manual Neighbour Allocation

Basic Predictions

(Best Server, Signal Level)

Monte-Carlo

Simulations

Signal Quality and

Throughput Predictions

Cell Load

ConditionsSubscriber Lists

And /or

Frequency PlanAnalysis

Automatic or Manual Frequency Planning

Automatic or Manual Physical Cell ID Planning

ACP


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Training Programme



3. LTE Predictions





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Global Settings

Frequency Band definition

Frame Structure Settings

Radio Parameters

Site

Transmitters

Cells

Equipment Parameters

User-definable reception characteristics

Forsk 2011 Confidential Do not share without prior permission Slide 9 of 82


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Global Settings (1/2)

Frequency Bands

Atoll can model multi-band networks within the same document

TDD (Time Division Duplexing) or FDD (Frequency Division Duplexing)

One frequency band assigned to each cell



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LTE Frame Structure definition

System-level constants (Hard-coded)

Width of a resource block (180 kHz)

Frame duration (10 ms)

Other control channel overheads defined by 3GPP (calculated based on 3GPP specs)

Reference signals, PSS, SSS, PBCH, etc.

Global Settings (2/2)


TDD option only :

Switch from DL to ULevery half frame

(default) or every

frame

Number of SD for

PDCCH (0,1,2 or 3)

carrying DL and UL

Resource allocation

information

Normal (default) or extended

cyclic prefix (No. of SD per slot)

e.g.: at 15 kHz, 7 SD/slot

(normal) or 6 SD/slot (extended)

Average number of

resource blocks for

PUCCH


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Radio Parameters Overview

Site

X (longitude) and Y (latitude)

Transmitters

Activity

Antenna configuration (model, height, azimuth, mechanical & electrical tilts...)

UL & DL Losses / UL Noise Figure

Propagation (Model, Radius and resolution)

Cells

Frequency Band & Channel

PCI

Power definition

Min RSRP

UL & DL Load

Diversity Support

Neighbours


Presented in

General Features


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Transmitter Parameters


Propagation settingsAntenna Configuration and Losses

parameters

Cells parameters

(see next slide)

Antenna

Configuration

DL and UL

total losses,

UL noise

figure


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Equipment Parameters (1/2)

Bearers (Modulation and Coding Schemes) definition

User-definable bearer efficiencies

(useful bits per resource element)

Bearer selection thresholds for link adaptation

Quality indicator graphs

BLER used to model the effect of errors in data reception



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Training Programme



3. LTE Predictions





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3. LTE Predictions

Introduction

Parameters used in Predictions

Prediction Settings

Fast Link Adaptation Modelling

Coverage Prediction Examples

Point Analysis Studies



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Introduction

Principles of the studies based on traffic

Study calculated for

Given load conditions

UL noise rise

DL traffic load

A non-interfering user with

A service

A mobility

A terminal type (in case of a directive antenna , it is oriented towards the serving cell)



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Load Conditions

Load conditions are defined in the cells table

Values taken into consideration in

predictions for each cell



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Service Properties

Parameters used in predictions

Highest bearers in UL and DL

Body loss

Application throughput parameters



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Mobility Properties


Mapping between mobilities and thresholds in bearer and quality indicator determination (as

radio conditions depend on user speed).



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Terminal Properties


Minimum & Maximum terminal power

Gain and losses

Noise figure

Antenna settings (incl. MIMO support)

Number of Antenna ports in UL

and DL in case of MIMO

support


Support

of MIMO

Min & Max

Power +

Noise

Figure +

Losses


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Prediction Settings

Coverage Prediction Plots

Standard predictions

Best server plot

Coverage by signal level

Multiple server coverage

Reference signal, SS, PDSCH, PBCH, PDCCH and PUSCH/PUCCH signal level and quality

predictions

Selection of a mobility, a service, a terminal (possibly directional antenna oriented towards the serving

cell)

Reference signal, SS, PDSCH, PBCH, PDCCH and PUSCH CNR plots

RSRP (Average Reference Signal Level Received Power per Subcarrier) plots



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Fast Link Adaptation Modelling

Atoll determines, on each pixel, the highest bearer that each user can obtain

No soft handover

Connection to the best server in term of reference signal level (C)

Bearer chosen according to the radio conditions (PDSCH and PUSCH CINR levels)

Process : prediction done via look-up tables


Best Server Area determination

(min RSRP)

Radio Conditions estimation

(PDSCH and PUSCH CINR

calculation)

Throughput

&

Quality Indicator (BER and BLER)

predictions

Reference Signal Level (C)

evaluation

Bearer Selection


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Prediction Examples (General Studies)

Coverage by signal level

(Based on reference signal power)

Number of servers(Based on reference signal power)



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Prediction Examples (Dedicated Studies)


Coverage by PUSCH CINR

(Isotropic receiver antenna)

Coverage by PUSCH CINR(Directional receiver antenna)


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Radio Reception Diagnosis at a Given Point : Reception Analysis

Point Analysis Tool: Reception


Choice of UL&DL load conditions :

if (Cells Table) is selectedAnalysis based

on DL load and UL noise rise from cells table

Definition of a user-definable probe"

receiver, indoor or notCell bar graphs (best

server at the top)

Analysis detail on

reference signals,

PDSCH and PUSCH

Reference

Signals,

PDSCH and

PUSCH

availability

(or not)

Selection of the value to be

displayed (RS, SS, PDSCH,

RSRP)


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Radio Interference Diagnosis at a Given Point : Interference Analysis

Point Analysis Tool: Interference


Choice of UL&DL load conditions :

if (Cells Table) is selectedAnalysis based on

DL load and UL noise rise from cells table

Definition of a user-

definable probe"

receiver, indoor or not

Selection of the value to be displayed

(RS, SS, PDSCH, RSRP)

Serving Cell

(C)

Total Level of

Interference

(I + N)

List of Interfering Cells


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Training Programme



3. LTE Predictions





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4. Frequency Plan Analysis

Channel and Physical Cell ID Search Tools

Physical Cell ID Allocation Audit

Physical Cell ID Histograms



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Search Tool Overview

Tool to visualise channel and PSS ID reuse on the map

Possibility to find cells which are assigned a given :

Frequency band + channel

Physical Cell ID

PSS ID

SSS ID

Way to use this tool

Create and calculate a coverage by transmitter with a colour display by transmitter

Open the Find on Map tool available in the Edit menu

(or directly in the toolbar )



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Channel Search Tool

Channel Reuse on the Map


Colours given to transmitters

Red: co-channel transmitters

Yellow: multi-adjacent channel (-1 and +1) transmitters

Green: adjacent channel (-1) transmitters

Blue: adjacent channel (+1) transmitters

Grey thin line: other transmitters

Frequency

band and

Channel

number

Resource

Selection


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Physical Cell ID, PSS ID and SSS ID Reuse on the Map

Physical Cell ID Search Tool

Colours given to transmitters

Red or Grey thin line: if the transmitters carries or not

the specified resource value (Physical Cell ID, PSS ID

or SSS ID)


Resource

Type and

Value

Resource

Selection


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PCI Allocation Audit (1/2)

Verification of the allocation inconsistencies

Respect of a minimum reuse distance

Respect of neighbourhood constraints (two neighbour cells must have different PCI)

Respect of SSS ID allocation strategy



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PCI Allocation Audit (2/2)

Audit results

Inconsistencies are displayed in the default text editor


The minimum distance constraint is fulfilled

Cells BRU010_L1 & BRU116_L2 areNeighbour cells but have been allocated

the same PCI

These 13 sites do not fulfil the SSS ID

allocation strategy:

on each site, allocated PCI do not have thesame SSS ID


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Physical Cell ID Histograms

View of the Physical Cell ID Distribution

Dynamic

pointer



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Training Programme



3. LTE Predictions





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Traffic Modelling (1/2)

Traffic DataTraffic maps and subscriber lists

Various types of traffic maps:

Raster traffic maps

Vector traffic maps

Live traffic maps

Traffic density maps

Live Traffic Data

Vector Traffic Data

Raster Traffic Data

Subscribers


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Monte Carlo Simulations (2/3)

Simulation ResultsFor each cell

UL and DL traffic loads

UL noise rise

UL and DL aggregate cell throughputs

Traffic input and connection statistics

For each mobile Serving transmitter and cell

Azimuth and tilt (towards the serving cell)

Reference signal, SCH/PBCH, PDSCH, and PUSCH signal levels

Reference signal, SCH/PBCH, PDSCH, and PUSCH CINR and interference levels

Best bearers based on PDSCH and PUSCH CINR levels

Cell throughputs, cell capacities, and user throughputs PDSCH and PUSCH CINR levels

Connection status and rejection cause


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Documents

Atoll-3-1-0-LTE-Light.pdf