proposal for methodology to estimate spectrum requirements for ams(r)s satellite systems
DESCRIPTION
Proposal for methodology to estimate spectrum requirements for AMS(R)S satellite systems under AI 1.7 (WRC-11) Presentation at the ACP/WGF 19 th meeting 15-19 Sep 2008 Tony Azzarelli (European Space Agency). WP4C Work: Methodology. 1. ACP/WGF. Satellite Technology inputs. - PowerPoint PPT PresentationTRANSCRIPT
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Proposal for methodologyto estimate spectrum requirements
for AMS(R)S satellite systemsunder AI 1.7 (WRC-11)
Presentation at theACP/WGF 19th meeting 15-19 Sep 2008
Tony Azzarelli(European Space Agency)
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WP4C Work: Methodology
Aviation requirements
inputs
Satellite Technology inputs
Total Bandwidth Requirement
Methodology to derive Spectrum
Requirements for WRC-11 AI 1.7
RIT(t), MIT
2. ITU-R WP4C1. ACP/WGF
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Aviation Communication Needs
1.a) Simulation Approach
RIT(t;s)
MIT = max { RIT(t;s) }
e.g. COCR
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Aviation Communication Needs
•time
Amount of data
in one flight
flight path / phases
•cruise
•departure
•arrival
•at airport
•begin •end
airport •departure cruise arrival airport
•at airport
Flight Phases
Communications
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Aviation Communication Needs
Chart thanks to CNES
SIMULATION
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Aviation Communication Needs
RIT(t; S) =
(i = 1 .. n) Ri(t; S)
= R n(t; S)
R (Mbps)n(t;S) number of transmitting a/c Maximum RIT (MIT)
R1(t;s)
R2(t;s)
Ri(t;s)
RN(t;s)
Aggregate Throughput
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WGF output / WP4C input
Aviation Area (S)
RIT(t; S)
Airspace Unit (S)
RIT(t; S)
Spot beam area ()
RIT(t; ) =RIT(t, S)
Use of
SPOT BEAMS
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WGF output / WP4C input
1.b) PIAC Approach
• PIAC
• r = average(t) { R(t) }
e.g. COCR
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WGF output / WP4C input
Output
Aviation Communication Needs
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WGF output / WP4C input
1. Output of the Simulation Approach
•RIT(t; s) = i=1 .. n Ri(t;s) = R · n(t;s) where: n(t;s) = number of transmit a/c at t
•MITSIM(s) = max(t) { RIT(t;s) } = R max{ n(t;s) } = R n(s)
MIT(s)= R n(s)
t0
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WGF output / WP4C input
2. Output of the PIAC Approach
MITPIAC(s) = PIAC(s) * r(s)
where: PIAC(s) = N(s) maximum instantaneous a/c count in the region
And: r(s) = average{ R }, average data rate per flight.
The two approaches are the same because MITSIM = MITPIAC, i.e.:
MITSIM = R n(s) = i=1..n R(to; s)
= PIAC (1/PIAC) i=1..n R
= PIAC (1/PIAC) i=1..PIAC R pi(to;s)= PIAC average(i) { Ri } = PIAC mean(t) { R(t) } (ergodic)= MITPIAC
One would use one approach or the other depending on the tools availableto calculate the aviation throughput and also depending if the satellite has or not spot beams.
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WGF output / WP4C input
These outputs will be provided to WP4C for
Calculating Bandwidth for
AMS(R)S Services under WI 1.7
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WP4C Work: Methodology
2. ITU-R WP4C MethodologySatellite
characteristicsAviation
comms needs
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WP4C Work: Methodology
Detailed Methodology
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WP4C Work: Methodology
Step 1: beam structure
MIT(i)
MIT(S)
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WP4C Work: Methodology
Step 2:
Bandwidth Calculation
per beam or cluster of beams
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WP4C Work: Methodology
Step 2
= 1 + 1 + 2
Framing overhead at different protocol layers
Signalling overhead1.
encoding modulation raw spectrum
Rj-1
signal domain
Rj
Filtering
BBw
data domain
data2.
= b · ·
3. = 1 2
=/B
due to satellite access method (e.g. CDMA)
F S
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WP4C Work: Methodology
Step 3
BR(1)
Aviation region
= 3/11
BRSS= (3/11) BR()
> 3/11
Non-Uniform Throughput
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WP4C Work: Methodology
BRSS = BR()
= MIT()
= MIT()
RIT
MIT ()
T() = MIT
RS() = T
BR() = RS
BRSS = BR
required bandwidth
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Comments are welcome!
Thank you for your attention!