International Telecommunication Union Radiocommunication Bureau

1
International Telecommunication
UnionRadiocommunication Bureau

• Software for Determination of Coordination
  Requirements for Space Networks in the Planned
  Bands - MSPACEg
• Alexandre Vassiliev(e-mail alexandre.vassiliev_at_i
  tu.int)

2
What Is the Purpose of MSPACEg?

• To determine the coordination requirements for
  space network in the planned bands (Space Plans)
  - Appendices S30, S30A, Resolution 542 (WRC-2000)
  and Appendix S30B to the Radio Regulations.
• To optimise parameters of new networks in the
  Planned bands (reduce number of affected).
• To estimate negative effect of modifications
  submitted by other Administrations.
• To perform C/I, C/N calculations under Articles
  S9 and S11 of the Radio Regulations.
• To do What If Studies (find the most affected
  test points, channels, beams, etc.).
• Etc.

3
MSPACEg was also used

• at WRC-97 for modification of Regions 1 and 3 BSS
  Plans in accordance with Resolution 531 (WRC-95)
• at WRC-2000 for Regions 1 and 3 BSS Re-planning
  in accordance with Resolution 532 (WRC-97).

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MSPACEg Output (sample 1)

• Different Reports with information concerning
  affected assignments / allotments. For example
  Compressed Report see an extract below

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MSPACEg Output (sample 2)
Or Graphical Report with affected test points
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MSPACEg Output (sample 3)
If you select a Single-entry C/I option, create
and run a query against of output database - you
may get information on the worst Single-entry C/I
interfering emission(s)
7
Plans Development(Regional Plans)

• WARC-77 - Broadcasting Satellite Service (BSS)
  Plan for Regions 1 3 in the band 11.7 - 12.5
  GHz (Region 1) and 11.7 - 12.2 GHz (Region 3)
  Appendix S30.
• WARC-88 - established the associated feeder-link
  Plan in the frequency bands 17.3 - 18.1 GHz and
  14.5 - 14.8 GHz Appendix S30A.
• RARC-83 and WARC-88 - established the combined
  feeder/down link Plan for Region 2 in the
  frequency bands 17.3 17.8 GHz and 12.2-12.7
  GHz Appendices S30, S30A.
• WRC-97 - revised Regions 1 and 3 BSS Plans (both
  feeder-link and down-link) to include so-called
  new countries and revised Appendices S30 and
  S30A.

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Plans Development(Regional Plans)

• WRC-2000
• developed new Regions 1 and 3 BSS Down-link Plan
  in the frequency band 11.7 - 12.5 GHz Article
  11 of the Appendix S30 to the Radio Regulations
• developed associated Regions 1 and 3 Feeder-link
  Plans in the frequency bands 17.3 - 18.1 GHz and
  14.5 - 14.8 GHz Article 9 of the Appendix S30A
  to the Radio Regulations
• established List of Additional Uses in the same
  frequency bands (mentioned above) annexed to the
  Master International Frequency Register
  Resolution 542 (WRC-2000)
• modified Appendices S30 and S30A.

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Plans Development (World-wide Plans)

• Only Fixed Satellite Service Plans
• WARC-88 - established 2 FSS Plans for all
  Administrations in all 3 Regions in the following
  frequency bands
• 6 GHz (6.725-7.025 GHz) - feeder-link 4 GHz
  (4.500-4.800 GHz) - down-link (C - band)
• 13 GHz (12.75-13.25 GHz) - feeder-link 10-11 GHz
  (10.70-10.95 GHz and 11.20-11.45 GHz) - down-link
  (Ku - band).
• FSS Plans and their technical aspects are
  described in the Appendix S30B of the Radio
  Regulations

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Plans Covered by MSPACEg

• WRC-2000 BSS Downlink Plan and List of Additional
  Uses for Regions 1 and 3 Appendix S30,
  Resolution 542 (WRC-2000) Appendix S30.
• WRC-2000 Regions 1 and 3 14 GHz Feeder-link Plan
  and List of Additional Uses Appendix S30A,
  Resolution 542 (WRC-2000).
• WRC-2000 Regions 1 and 3 17 GHz Feeder-link Plan
  and List of Additional Uses Appendix S30A,
  Resolution 542 (WRC-2000).

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Plans Covered by MSPACEg

• RARC BC SAT '83 combined feeder/down link Plan
  for Region 2 Appendices S30, S30A.
• WARC ORB-88 FSS Plans in 6/4 GHz band Appendix
  S30B.
• WARC ORB-88 FSS Plans in 13/10-11 GHz band
  Appendix S30B.
• Options for WRC-97 Regions 1 and 3 Plans as well
  as for Resolution 532 (WRC-97) Re-planning are
  still maintained.

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Plans Basic Technical Principles
Consideration of aggregate interfering effect
from all existing and virtual (e.g. included
in the Plan but not operational) interfering
sources (different comparing with networks in
non-planned bands).
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Plans Basic Technical Principles
Consideration of the worst test point.
Calculate aggregate interference for all
test points and consider the test point with the
lowest wanted signal and the highest interference
level.
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Geo-geometrical Factors Taken into Account in
Compatibility Analysis

• The effect of the following factors on wanted and
  interfering signals is taken into account
• space station keeping accuracy (in East/West
  direction only)
• space station antenna rotation accuracy
• space station antenna pointing accuracy.
• Earth station antenna considered to be fixed and
  properly pointed to the wanted satellite.

15
An Illustration of the Space Station Antenna
Rotation Accuracy
A test point which was originally inside of 3 dB
antenna gain contour is outside of that contour
when we take into account the space station
antenna rotation accuracy.
16
Antenna Characteristics Taken into Account in
Compatibility Analysis

• The following antenna (transmitting and
  receiving) characteristics are taken into account
  in the analysis
• antenna patterns (for all Plans)
• antenna polarization type circular (left and
  right) and/or linear (except FSS Plans)
• polarization angle - for linear polarization
  (except FSS Plans) and relative alignment angle
  between 2 linearly polarized signals (Rec. ITU-R
  BO.1212)
• polarization discrimination with and/or without
  depolarization induced by rain (except FSS
  Plans).

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Propagation Loss in Compatibility Analysis

• The following propagation factors are taken into
  account in the analysis
• free-space loss (for all Plans)
• atmospheric attenuation (Region 2 BSS Plan only)
• atmospheric absorption (Region 2 BSS Plan only)
• rain attenuation (Region 2 BSS Plan Regions 13
  Feeder-link Plans/Lists Power Control)
• rain depolarization (Region 2 BSS Plan Regions
  13 Feeder-link Plans/Lists Power Control)

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• Broadcasting Satellite Service (BSS) Plans/Lists.
• Appendices S30, S30A and Resolution 542
  (WRC-2000).

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Difference between Regions 1 3 Approach (EPM)
and Region 2 Approach (OEPM)
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Compatibility Criteria (1)

• A wanted BSS assignment may receive co-channel
  and adjacent channel interference. It was decided
  to employ Equivalent Protection Margin (EPM) or
  Overall EPM (OEPM) as compatibility criterion for
  BSS Plans

Where n3 for Regions 1 and 3 and n5 for
Region 2 i - interference category (1 -
co-channel, 2 - first lower adjacent channel, 3 -
first upper adjacent channel, 4 - second lower
and 5 - second upper adjacent channels)
- protection ratio for a given (i) interference
category
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Compatibility Criteria (2)

• Regions 1 and 3 BSS Down-link Plan/List
  (WRC-2000)
• An assignment of the down-link Plan/List
  (wanted assignment) is considered as being
  affected as a result of addition / modification
  of an assignment(s) if 2 conditions are met
• 1. under assumed free-space propagation
  conditions, the Power Flux Density (PFD) value
  derived from the PFD mask(s) given in paragraph
  a) of Section 1 of Annex 1 to Appendix S30 is
  exceeded at least at one of the test points of
  the wanted assignment AND
• 2. the reference EPM at least at one of the test
  points of that wanted assignment falls more
  than 0.45 dB below 0 dB, or, if already negative,
  more than 0.45 dB below that reference situation
  value.

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Compatibility Criteria (3)
Regions 1 and 3 Feeder-link Plans/Lists
(WRC-2000) An assignment of a feeder-link
Plan/List (wanted assignment) is considered as
being affected as a result of addition of new
assignment(s) or modification of an existing
one(s) if the reference EPM at least at one of
the test points of that wanted assignment falls
more than 0.45 dB below 0 dB, or, if already
negative, more than 0.45 dB below that reference
situation value.
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Compatibility Criteria (4)

• Region 2 BSS Plan
• A modification to Region 2 Plan considered to be
  compatible with other assignments in the Plan or
  earlier submitted additions/modification to the
  Plan
• if the calculated OEPM values of the assignments
  in the Plan and earlier submitted modifications
  for all channels/test points are greater than
  -.25 dB, OR
• if OEPM is already negative, its degradation in
  negative area resulting from this modification is
  less than 0.25 dB comparing with the OEPM value
  for the same channel/test point calculated before
  that modification was included in analysis.

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Non-standard Channeling in BSS Plans/Lists

• There are many submissions having so-called
  non-standard emissions (digital and analogue)
  with non-standard bandwidth and/or non-standard
  assigned frequency, e.q.

real (if any) overlap is taken into account in
calculations
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Grouping in the BSS Plans/Lists

• Mainly utilized for
• simulation of several emissions not transmitted
  simultaneously
• modification of the orbital position.
• Only one (the worst) interfering signal is
  selected during EPM/OEPM calculation but all
  members of the group are protected.

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• Fixed Satellite Service (FSS) Plans Appendix
  S30B.

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Compatibility Criteria for FSS Plans

• Two main criteria are used for FSS Plans
• aggregate C/I value should be gt 26 dB to consider
  modification/addition to be compatible with the
  Plan
• single-entry C/I value which should be gt 30 dB
  (value may be increased in when macrosegmentation
  concept is applied) to consider
  modification/addition to be compatible with the
  Plan. The single-entry C/I calculated for each
  pair of the wanted and an interfering assignments
  (interference from one interfering source).
• Appendix S8 method/criteria are also used for
  compatibility analysis with the existing
  networks, etc.

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Specificity of the FSS Plans

• Technical aspects
• includes allotments/assignments with both feeder
  and down links and allotments/assignments having
  only feeder and down-link
• have different protection criteria (Appendix S8)
  for determination of compatibility between the
  existing systems
• employ so-called Macrosegmentation concept (
  Annex 3B) upper 60 of each allotment band is
  used for high-density carriers and the lower 40
  for low-density carries (leads to a messy
  situation when it is not respected)
• different single-entry C/I criterion (Annex 4) in
  case when an allotment is not in consistency with
  Annex 3B (Macrosegmentation)
• predetermined arc concept (PDA) pre-design stage
  ?10? design stage ?5?, operational state 0 ?

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Specificity of the FSS Plans

• Regulatory aspects
• Sub-regional systems and suspended national
  assignment (Section II of Article 6)
• A group of administrations may bring into use a
  sub-regional system on one or more orbital
  positions, preferably from the national
  allotments.
• All or part of national assignments of this
  sub-regional system are suspended (unless they do
  not affect other allotments in the Plan) but
  still enjoy the same protection.
• The interference between the sub-regional system
  and its members suspended national assignments
  are not taken into account in the compatibility
  analysis
• The interference caused by either sub-regional
  system or the suspended assignments are taken
  into account in the compatibility analysis with
  allotments of other administrations.

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• C/I, C/N and I/N Analysis in non-planned bandsin
  accordance with Articles S9, S11 of the Radio
  Regulations NOT CONSIDERED IN THIS PRESENTATION

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Structure of MSPACEg Software
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Graphical User Interface (input/output options)
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MSPACEg Output Files

• Depending on option chosen, MSPACEg produces two
  or three output files
• The findings file, containing the list of
  affected beams channels test points
• The reference situation file
• for BSS and FSS Plans contains newly-calculated
  reference situations
• for the Article S9/S11 C/I analyses, the results
  of the engineering analyses, such as C/N, C/I,
  I/N
• The details file with detailed intermediate
  results for a single beam. Generated when a
  detailed analysis is requested.
• All MSPACEg output files are ASCII text files.

34
Fragment of Findings Report (FSS)
MSPACEG Version 1.960 (MS Windows)
30.09.2000 180440 ITU Appendix 30B
Analysis at 13/10-11 GHz
RS19K.INP, USASAT-13I and USASAT-26 networks are
recorded... FINDING FOR BEAM USA26G00
NOT IN COMPLIANCE WITH ANNEX 3B FREQUENCY
BELOW WHICH PEAK/AVERAGE POWER IS LESS THAN 5 dB
IS 12.75000 THIS IS LOWER THAN 40 OF THE
BAND AND THEREFORE OTHER BEAMS WILL BE
CONSIDERED TO BE AFFECTED IF THE SINGLE ENTRY C/I
IS LESS THAN 34.50 dB INSTEAD OF 30.0
dB . . Appendix 30B Analysis Note 1
Degradations of less than 0.05 dB are ignored.
Note 2 Degradations greater than or equal to
0.25 dB are flagged with an asterisk.
Wanted TP TP New Ref
Interfering Type Beam
Long Lat C/I C/I Degradation
Beam S.E. ALS00000 172.00 54.00 29.57
29.64 0.07 URSEEDRL S.E.
USA13I00 -89.10 13.40 25.99 34.50
8.51 USA26G00 S.E. USA13I00 -87.58
13.00 26.30 34.50 8.20 USA26G00
AGG. USA13I00 -83.67 10.83 21.32 21.38
0.06 . .
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A Fragment of a Detailed Report
Desired Uplink Frequency 14640.38 MHz
(Channel 7) Sat. Max. Gain 37.24
dBi Transmitter Power 25.00 dBW
(NON-STANDARD) Pt Spnt Phi FS
Atm Rain GSAT GSAT GES GES Num
Err Phi Not Loss Loss Loss Copol
X-pol Copol X-pol 1 0.1 1.426 2.824
207.116 0.000 0.000 34.182 2.240 57.000
22.000 2 0.1 1.235 2.803 207.199 0.000
0.000 34.912 2.240 57.000 22.000 X-pol
Equiv Cup Min Discr Gain (K)
Cup 999.900 91.912 -91.287
-91.934 999.900 91.912 -91.287
-91.934 . . Uplink Interference Power to
AFS02100, Channel 7 Pol QRM QRM QRM QRM
Topoc FS Atm Rain GSAT GSAT GES
GES Beta Ind Chan Pwr Pt Angle Loss
Loss Loss Copol X-pol Copol X-pol X-Pol
12 7 25.00 1 55.8233 207.954 0.000 0.000
8.078 0.000 -10.000 -10.000 X-Pol 12 7
25.00 2 56.0780 207.899 0.000 0.000 7.002 0.000
-10.000 -10.000 X-pol Equiv Int Adjust
QRM Discr Gain CAT Factor Up 999.900
0.967 1 0.000 -181.988 999.900 0.209 1
0.000 -182.690 .. ..And
many other details
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Output Database (for BSS Plans/Lists)
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MSPACEg Compressed Report

• Three formats (on the screen or printed
  below)
• report for Region 2 Plan
• report for Regions 1 and 3 Down-link Plan/List
• report for Regions 1 and 3 Feeder-link
  Plans/Lists.

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POWCONg

• The POWCONg software enables the user to
  calculate the permissible increase in the
  e.i.r.p. to overcome rain attenuation. POWCONg
  covers the following Plans
• WRC-2000 14 GHz Feeder-link Plan/List for Regions
  1 and 3 Appendix S30A, Resolution 542
• WRC-2000 17 GHz Feeder-link Plan/List for Regions
  1 and 3 Appendix S30A , Resolution 542.
• New version of POWCONg is currently under
  development.

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The Future SPS System Development

• Development of an interface to provide access
  from MSPACEg, POWCONg software to the integrated
  SNS/SPS data base (flexibility and connectivity
  with other applications).
• Replacement of the existing report files by the
  database for all Plans/Lists with output data and
  reporting tools (flexibility and less disk
  space).

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References

• Appendices S30, S30A, S30B and Articles S9, S11
  of the Radio Regulations
• Final Acts RARC-83, WARC-88, WRC-2000
• MSPACEg Software Package (includes documentation)
  Version 1.96, September 2000. MSPACEg system is
  distributed on SRS-on-CD
• ITU-R Recommendations (SG 4, 6 and their Working
  Parties including former JWP 10-11S)
• ITU Web side http//www.itu.int

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MSPACEg Software Demonstration Questions???