introduction to seamcat example of mca study

Introduction to SEAMCATExample of MCA study

Stella Lyubchenko European Communications Office

55th CRAF meeting, 3rd - 5th April 2013([email protected])

EUROPEANCOMMUNICATIONSOFFICE

Nansensgade 19DK-1366 CopenhagenDenmark

Telephone: + 45 33 89 63 00Telefax: + 45 33 89 63 30

E-mail: [email protected] Site: http://www.cept.org/eco

mailto:[email protected]

http://www.cept.org/eco

55th CRAF meetingStella Lyubchenko / ECO

OutlineWhy SEAMCAT?

The Graphical User Interface

Flexibility to the User’s need

Systems you can simulate

Calculations in general

Example of MCA study


Part 1: Why SEAMCAT?


• Analytical analysis, usually by worst-case approach:– Minimum Coupling Loss (MCL) method, to establish

rigid rules for minimum “separation”• Statistical analysis of random trials:

– The Monte-Carlo method, to establish probability of interference for a given realistic deployment scenario

– That is where SEAMCAT comes into picture!

Compatibility/sharing study tools


Purpose

• SEAMCAT is designed for:– Generic co-existence studies between different

radiocommunications systems operating in same or adjacent frequency bands

– Not designed for system planning purposes• Can model any type of radio systems in terrestrial interference

scenarios (mobile, broadcasting, Fixed etc..)• Used for analysis of a variety of radio compatibility scenarios:

– quantification of probability of interference between various radio systems (unwanted emissions, blocking/selectivity)

– quantification of throughput and data loss for CDMA and OFDMA system

• Based on Monte-Carlo generation


Strategic tool for CEPT

• For performing compatibility/sharing studies– Used in generating studies for ECC/CEPT Reports

• As a Reference tool– Recognised at ITU (Rep. ITU-R SM.2028-1)

• As an agreed work platform– Project Teams (PTs) can focus on the input

parameters and not on the algorithm– Sharing simulation between proponents ease the

trust in the results• For educating future generation of spectrum

engineer (Administrations, Industry or University)


Usage within and outside CEPT

Source: google analytics on the www.seamcat.org download page (May 2011/2012 period)

http://www.seamcat.org/


Part 2: The Graphical User Interface


• Windows-oriented • Main element – workspace.sws

Main user interface

Simulations input data – scenario:Equipment parameters, placement, propagations settings, etc.

Simulation controls: number of events etc..

Simulation results:dRSS/iRSS vectors, Pinterference, Cellular structure


Graphic interface (1/1)

Easy view of parameters at a glance

Easy comparison of workspaces

Graphical reminders (tooltip)


Graphic interface (1/2)

Shows positions and budget link information of the victim

and interfering systems

Overview of results (dRSS, iRSS)

Intuitive check of simulation scenario


Part 3: Flexibility to the User’s need


Simple and harmonised interface

AddDuplicate Delete

Multiple interferer

generation

On-line Help

Workspaces Interfering links


Welcome + NewsHistory• Welcome + News • History


Libraries and Batch

• Easy to create workspaces with predefined libraries• Edit, import, export

• Easy to run sequentially workspaces• Batch operation• Intuitive use


Multiple vectors displayCalculated vectors or

external vectors Statistics and signal type


• This plug-in may be used to define ANY kind of propagation model

• The plug-in may be inserted at any point where propagation model is defined in the scenario

Propagation model plug-in

• No complexity limit • No limit to the inputs• Description of inputs


Comparing propagation model

Compare two or more propagation models

Results in linear or log format


Part 4: Systems you can simulate


System type

Generic CDMA OFDMA


Generic system


Cellular modelling• Modelling of cellular systems as victim,

interferer, or both:• Quasi-static time within a snapshot• One direction at a time (uplink or downlink)

• CDMA• Voice traffic only • Particular CDMA standard defined (CDMA2000-1X, W-CDMA/UMTS)

• OFDMA• LTE


Part 5: Calculations in brief


Interference CalculationsInterfering Modes Interference Criteria

Unwanted and Blocking Signals


Unwanted Emissions• Victim

fv

Receiver Bandwidth

• Interfering System

fI

Interfering emission mask

fI

Interferer emission mask


Results

N = -110 dBmIRSS Unwanted = - 97.78 dBmI/N = - 97.78 – (-110) = 12.21 dB ( Calculated by SEAMCAT)Interference Criterion was: I/N = 0 ( Input to SEAMCAT)


Part 6: Example of MCA study


Assumptions for study

• The secondary RAS allocation in the band 2655 – 2690 MHz• Protection criterion -177dBm in 10MHz which should not be

exceeded for 2% of time (in SEAMCAT it will be interpreted as a percentage of snapshots for which criterion is not exceeded)

• Telescope height is 50 m.• 1 aircraft within 100 km (within a cylinder: 3000 m – 15000 m)• Deployment density considered: 0.0000255 km2

• For the secondary RAS allocation in the band 2655 – 2690 MHz;• Max allowed power of IT was calculated -81 dBm in 10 MHz

MCA sws


Thank you - Any questions?

introduction to seamcat example of mca study

Documents

jukka rakkolainenero11part

simulation results

probability of interference

input parameters

simulation controls

algorithmsharing simulation

type of radio systems

data loss