3. ATDI in a few words
Provides software and services in radio communication
• Radio network planning & optimization (civil & military)
• Spectrum management
• Digital cartography
Team of engineers with high level of expertise
A significant number of clients : around 1,000 references
More than 20 years of experience in the industry
Headquartered in Paris, ATDI has several offices around the world and a network of
distributors
4. ATDI software solutions
ICS telecom HTZ warfare
The most comprehensive software for any kind of radio The infrastructure and tactical electronic
network planning : broadcasting, microwave, WiMAX, warfare radio network planning tool ,adapted
LTE, mobile, PMP, etc. allowing coexistence analysis for new military concepts
ICS manager ICS map server
The most complete and efficient spectrum Advanced software system designed to produce
management platform for national regulators and manage digital cartography
5. ATDI broadcast expertise
Broadcast planning is at the heart of
ATDI’s expertise and experience
• ATDI’s first radioplanning tool was developed in 1988 for the
broadcast industry
• ATDI has been a major actor of every change in the broadcast
industry
• Participated to the Ge06 conference alongside our customers
• Our tools and services are widely used for the implementation
of digital broadcast plans and in the digital broadcast switchover
process
• Broadcast references in more than 50 countries
• Technical support and consultancy for each particular case
8. Part 2 – Digital switchover process
Digital network calculation‐ hypothesis
• Is the technology chosen (DVB‐T, DVB‐T2, ISDB‐T,..)?
• Number of channels/multiplex chosen?
• Which percentage of population has to be covered?
• Which rules used to plan a new station and
switch off the old one?
• Maximal number of new stations / budget allowed?
• Position of the reception antenna (outdoor 10m, indoor)?
• Propagation model chosen by ATDI validated.
• Network SFN or MFN?
Considering that each choice has a big impact on the number of new stations to be
deployed, it is necessary to give some flexibily for some criterion.
9. Part 3 : Smooth Switchover
The digital network calculations are not sufficient :
coexistence studies have to be done.
Through a relevant use case, we’ll see some of the key challenges in order to
avoid:
• Interferences
• Unsecured network
• Reduced quality of service
• Unsatisfied customers
These radio planning techniques are addressed to:
• Broadcasters co‐existing with other networks
• Regulation authorities overseeing the technology transitions
• Mobile Operators
10. Part 3 : Smooth switchover
Example :
The coexistence LTE DVB‐T
Numerous other challenges are associated to the switchover and are also
addressed by ATDI’s solutions
11. Coexistence LTE DVB
Digital broadcast switchover under way
Launch of the Digital Terrestrial Television (DTT)
Switch from analogue services
Release of a significant amount of spectrum:
The Digital Dividend
Allocation of part of the released spectrum to LTE
Cohabitation of Digital Television (DVB‐T) and Mobile
communication (LTE) within the same band
Coexistence issues
with significant technical and economical impact
12. Coexistence LTE DVB
Digital broadcast switchover under way
Multi‐technologies technical coexistence studies have to be performed
by the broadcasters and the operators in order to:
• Quantify the impact of each technology over the other
• Analyze the affected population and services
• Estimate the cost of such deployment
13. Coexistence LTE DVB: Case study
Harmonised frequency plan about DVB‐T and LTE from CEPT report 31
• Challenge was that the lowest block of spectrum due to be auctioned was
immediately adjacent to the allocation for digital broadcasting
• Small guard band between the two services
14. Coexistence LTE DVB: Case study
Objectives:
• Inform stakeholders of any technical constraints prior to auction of the dividend
spectrum
Selected key assumptions:
• Interference from LTE network into DVB‐T network to be analysed
• Channels FDD1 and FDD2 were considered as sources of interference and studied for
every interference case
• The three highest DVB‐T channels were studied for adjacent channel interference
• All DVB‐T receiver channels were considered to suffer interference
• The DVB‐T service for fixed rooftop antennas was modelled at 10m above ground
level using directional antennas
• All of the receiving antennas were directed towards the best server
15. Coexistence LTE DVB: Case study
Methodology
Consider LTE signal interference only into the upper
three DVB‐T channels (58, 59 and 60)
In case of blocking of the DVB‐T receiver by an LTE
signal, all UHF DVB‐T channels are considered
Accurate Digital Terrain Model (DTM)
Recent clutter model
Population data
16. Coexistence LTE DVB: Case study
Service area calculation
Service area calculation:
Best server (yellow arrow) calculation model
17. Coexistence LTE DVB: Case study
Antenna discrimination
Using directional antennas
to reduce unwanted signal strength from other directions
18. Coexistence LTE DVB: Case study
Interference calculations
• The assessment focused on
interference in each of the
broadcast channels (58, 59 and
60) caused by the LTE channels
(FDD1 to FDD2)
• The maximum frequency
offset is between DVB‐T
channel 58 and LTE FDD2,
which is 22 MHz
19. Coexistence LTE DVB: Case study
Interference calculations
• To calculate the interference Channel edge PR
between DVB‐T and LTE, the separation (dB)
protection ratio is calculated (MHz)
1 ‐33
• Table shows protection ratio 6 ‐37
versus frequency separation 9 ‐40
between the channel edges of 14 ‐39
the wanted and interfering 17 ‐39
22 ‐45
signals
20. Coexistence LTE DVB: Case study
Blocking
DVB‐T transmitter
blocking by LTE signal
green ‐ wanted DVB‐T signal,
red ‐ unwanted LTE signal
21. Coexistence LTE DVB: Case study
Results
Can be presented in various ways:
By region, counties, cities, nation wide
Impact by MUX, channel from FDD1/2/3, etc.
Many maps or views are made available
By population
Coordination at borders (in/out bound) as ICS telecom
also handles coordination aspects
22. Coexistence LTE DVB: Case study
Results
Interference map (C/I) of the
LTE network on a specific DVB‐T
Allotment
(interference zones highlighted
in pink)
23. Coexistence LTE DVB: Case study
Results
Interference results for
MUX 1 by LTE FDD1, FDD2 and FDD3 on DVB‐T channel 60 (by county)
Channel 60
FDD1 FDD2 FDD3
Pop # Pop % Pop # Pop % Pop # Pop %
1 ‐ Østfold 3,447 1.27 972 0.36 483 0.18
2 – Akershus 160 0.03 51 0.01 5 0
6 – Buskerud 3,977 1.54 1,070 0.41 254 0.1
7 – Vestfold 5,900 2.57 1,481 0.65 843 0.37
8 – Telemark 1,327 0.79 551 0.33 211 0.13
9 – Aust‐Agder 105 0.1 39 0.04 4 0
18 – Nordland 28 0.01 18 0.01 0 0
19 – Troms 5 0 0 0 0 0
25. Advanced radio‐planning solutions
In order to optimize existing and emerging networks in terms of:
• Performance (coverage, QoS)
• Interference
• Co‐existence (today and tomorrow)
• Cost of ownership
Comprehensive and advanced radio‐planning solutions need:
• To support all radio technologies
• To manage interference and coexistence considerations within and
between competing technologies in the frequency spectrum
