tensions at the digital edge – planning for a smooth switchover
TRANSCRIPT
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Tensions at the digital edge – planning for a smooth switchover
Digital BroadcastingSwitchover Forum
Johannesburg, South Africa22.12.2012
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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 ofdistributors
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ATDI software solutions
ICS telecomThe most comprehensive software for any kind of radio network planning : broadcasting, microwave, WiMAX, LTE, mobile, PMP, etc. allowing coexistence analysis
HTZ warfareThe infrastructure and tactical electronic
warfare radio network planning tool ,adapted for new military concepts
ICS map server Advanced software system designed to produce
and manage digital cartography
ICS managerThe most complete and efficient spectrum
management platform for national regulators
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ATDI broadcast expertise
• 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
Broadcast planning is at the heart ofATDI’s expertise and experience
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ATDI broadcast references
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Part 2 – Digital switchover process
The switchover strategy is not only a technical topic, but has to be included in a global approach with a clear government politics and a strategic study:
•Definition of the digital network objectives
•Status of the existing network
•Digital network calculation
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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 bedeployed, it is necessary to give some flexibily for some criterion.
Part 2 – Digital switchover process
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Part 3 : Smooth Switchover
Through a relevant use case, we’ll see some of the key challenges in order toavoid:
• 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
The digital network calculations are not sufficient : coexistence studies have to be done.
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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
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Coexistence LTE DVBDigital broadcast switchover under way
Coexistence issues with significant technical and economical impact
Cohabitation of Digital Television (DVB‐T) and Mobile communication (LTE) within the same band
Allocation of part of the released spectrum to LTE
Release of a significant amount of spectrum: The Digital Dividend
Launch of the Digital Terrestrial Television (DTT)Switch from analogue services
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Coexistence LTE DVBDigital 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
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Coexistence LTE DVB: Case study
• 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
Harmonised frequency plan about DVB‐T and LTE from CEPT report 31
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Coexistence LTE DVB: Case studyObjectives:• 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
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Coexistence LTE DVB: Case studyMethodology
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
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Coexistence LTE DVB: Case studyService area calculation
Service area calculation: Best server (yellow arrow) calculation model
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Coexistence LTE DVB: Case studyAntenna discrimination
Using directional antennas to reduce unwanted signal strength from other directions
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Coexistence LTE DVB: Case studyInterference 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
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• To calculate the interference between DVB‐T and LTE, the protection ratio is calculated
• Table shows protection ratio versus frequency separation between the channel edges of the wanted and interfering signals
Channel edge separation
(MHz)
PR
(dB)
1 ‐336 ‐379 ‐4014 ‐3917 ‐3922 ‐45
Coexistence LTE DVB: Case studyInterference calculations
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DVB‐T transmitter blocking by LTE signal
green ‐ wanted DVB‐T signal, red ‐ unwanted LTE signal
Coexistence LTE DVB: Case studyBlocking
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Coexistence LTE DVB: Case studyResults
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
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Interference map (C/I) of the LTE network on a specific DVB‐T
Allotment(interference zones highlighted
in pink)
Coexistence LTE DVB: Case studyResults
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Interference results for MUX 1 by LTE FDD1, FDD2 and FDD3 on DVB‐T channel 60 (by county)
Channel 60FDD1 FDD2 FDD3
Pop # Pop % Pop # Pop % Pop # Pop %1 ‐ Østfold 3,447 1.27 972 0.36 483 0.182 – Akershus 160 0.03 51 0.01 5 06 – Buskerud 3,977 1.54 1,070 0.41 254 0.17 – Vestfold 5,900 2.57 1,481 0.65 843 0.378 – Telemark 1,327 0.79 551 0.33 211 0.139 – Aust‐Agder 105 0.1 39 0.04 4 018 – Nordland 28 0.01 18 0.01 0 019 – Troms 5 0 0 0 0 0
Coexistence LTE DVB: Case studyResults
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Coexistence LTE DVB: Case studyCoordination at the border
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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