Earth station coordination

1
COORDINATION OF EARTH STATIONS WITH RESPECT
TO TERRESTRIAL STATIONS AS WELL AS OTHER EARTH
STATIONS
Philippe Aubineau S.Venkatasubramanian
SSC/SSD RADIOCOMMUNICATION BUREAU
2
COORDINATION OF EARTH STATIONS WITH RESPECT TO
TERRESTRIAL STATIONS AS WELL AS EARTH STATIONS

• When ?
• Frequency bands allocated with equal rights to
  space and terrestrial services or earth stations
  operating in the opposite direction of
  transmission

Article 5
All Regions ___________________ 6700 - 7075
MHz FIXED FIXED-SATELLITE (Earth-to-space)
(space-to-Earth) MOBILE
Region 1 ___________________ 5850 - 5925
MHz FIXED FIXED-SATELLITE (Earth-to-space)
MOBILE

• The coordination area includes the territory of
  another country

3
PART I
PROVISIONS RELATED TO COORDINATION OF EARTH
STATIONS

• Article 5
• Article 9
• Article 11

(Volume 1 of the RR)

• Appendix 4
• Appendix 5
• Appendix 7(WRC-2000)

(Volume 2 of the RR)

4
PROVISIONS FOR EFFECTING COORDINATION OF EARTH
STATIONS
Article 9 of the Radio Regulations

• 9.6
• Administrations shall effect coordination
  before notifying to the BR or brings into use
  any frequency assignment
• 9.11A/9.15
• 9.17
• 9.17A
• 9.21

5
PROVISIONS 9.11A / 9.15
Coordination of a Specific or Typical Earth
Station of non-GSO in respect of Terrestrial
Stations
Footnote 5.389A The use of this frequency band
by mobile satellite service is subject to
coordination under 9.11A.
6
PROVISION 9.17
9.17 Coordination of any Specific earth station
or Typical Mobile Earth Station in respect of
Terrestrial Stations, in frequency bands above
100 MHz with the exception of the coordination
under 9.15
Region 1 ___________________ 5850 - 5925
MHz FIXED FIXED-SATELLITE (Earth-to-space)
MOBILE
B
A
EARTH STATION
Coordination area
7
PROVISION 9.17A
All Regions ___________________ 6700 - 7075
MHz FIXED FIXED-SATELLITE (Earth-to-space)
(space-to-Earth) MOBILE
9.17A Coordination of any specific earth station
in respect of other Earth Stations operating in
the opposite direction of transmission in
frequency bands allocated with equal rights to
space service in both directions of transmission
B
Rx EARTH STATION

EARTH STATION
A
Tx. EARTH STATION
8
PART II
COORDINATION AREA TECHNICAL CONCEPT
WITHIN THE COORDINATION AREA
Terrestrial Stations or Earth Stations operating
in opposite directions of transmission are likely
to receive interference from the earth station or
to cause interference to the earth station, above
the permissible level.

B

Receiving earth station
EARTH STATION
A
Coordination area
9
COORDINATION AREA TECHNICAL CONCEPT
OUTSIDE THE COORDINATION AREA
The level of permissible interference will not
be exceeded Most unfavourable case
assumptions as regards interference
B
A
10
COORDINATION AREA ADMINISTRATIVE CONCEPT
WITHIN THE COORDINATED AREA The earth station has
the right to operate with its coordinated
characteristics and at the level of agreed
interference
B
A
EARTH STATION
11
PART III
Calculation Method for Determination of
Coordination Area
Appendix 5 Reference of Article 9 (9.15)
Case Specific Earth Station or a Typical Earth
station associated with non-GSO in respect of
terrestrial stations in any frequency bands for
which a footnote refers to 9.11A Calculation
Method Appendix 7(WRC-2000)
12
Calculation Method for Determination of
Coordination Area
Appendix 5 Reference of Article 9 9.17
Case Specific earth station or mobile earth
station associated with GSO, non-GSO (with the
exception of cases covered under 9.15) with
respect to terrestrial stations in any frequency
bands except the plan bands Calculation Method
Appendix 7(WRC-2000)
13
Calculation Method for Determination of
Coordination Area
Appendix 5 Reference of Article 9 (9.17A)
Case Specific transmitting earth station
associated with non-GSO or GSO in respect of
other earth stations operating in the opposite
direction of transmission in frequency bands
allocated with equal rights to space
radiocommunication services in both directions of
transmission with the exception of bands subject
to plans Calculation Method Appendix
7(WRC-2000)
14
Calculation Method for Determination of
Coordination Area
Appendix 5 Reference of Article 9 (9.17A)
Case Receiving Earth Station There is no
methodology for calculating the receive earth
station coordination contour with respect to a
transmitting earth station. However, the
requirement of coordination can be identified by
verifying whether or not the receiving Earth
Station is falling within the coordination area
of any transmitting earth stations Calculation
Method Appendix 7(WRC-2000)
15
Coordination data
Annex 2A to Appendix 4

• GEOGRAPHICAL DATA Location, Altitude
• SATELLITE Location, Identification
• (Geo, Non-Geo)
• ANTENNA Max. gain, Radiation pattern
• OTHER CHARACTERISTICS
• Power, Maximum Power Density, Frequencies,
• Noise temperature, Analog / Digital
• HORIZON ELEVATION ANGLE DIAGRAM

16
HORIZON ELEVATION ANGLE
.
Horizon Elevation Angle
Earth station
Building
17
(No Transcript)
18
Appendix 7(WRC-2000) Methods for the
Determination of the Coordination Area

• MODE (1)
• Propagation of signals in troposphere via near
• great-circle paths
• 4 Basic radio-climatic zones A1, A2, B, C

• MODE (2)
• Propagation of signals by scattering due to
• hydrometeors
• 15 basic rain-climatic zones A to N, P and Q

19
Coordination contours shall be those which lead
to the greatest coordination distance Minimum
Coordination distance 100 km
20
Auxiliary Contour Appendix S7(WRC-2000)
B
Coordination contour
(55 dBW)
A
21
Coordination area of Receiving Earth Station
with respect to Terrestrial Stations
D
AUT
F
HNG
SUI
ROU
F
SVN
HRV
BIH
YUG
BUL
I
I
E
MKD
ALB
ALB
TUR
GRC
GRC
MLT
TUN
TUN
ALG
LYB  
EGY
Auxiliary Contours 10 dB and 20 dB
EGY
ALG
LBY
22
Coordination area of Transmitting Earth Station
with respect to other receiving Earth Stations
I
MLT
TUN
EGY
ALG
LBY
23
Coordination Area of Mobile Earth Stations
For a mobile earth station, the periphery of the
service area is extended by the coordination
distance. The coordination distance may be a
predetermined coordination distance or it may be
calculated (No additional protection can be
assumed to be available from the earth station
horizon elevation angle for all azimuths)
.
.
.
.
.
.
.
.
.
.
Earth Station Service Area
.
.
.
.
.
.
.
24
Coordination Area 9.11A/9.15
Ground-based Mobile Earth Station in respect of
Terrestrial Mobile(aircraft) in Band 1 - 3 GHz
Coordination Area
500 Km
500 Km
500 Km
Service Area Mobile Earth Station
500 Km
25
PART IV
COORDINATION REQUEST
COORDINATION DISTANCE CALCULATION
Coordination contours
Countries identified
APP 5
Coordination Request of Adm A (AP4/III forms And
Coordination Contours)
To Countries identified (Administrations B,
C, D, )
26
Response to Request of Coordination by
Administration B

• Acknowledge receipt of the coordination request
• Collect data on existing and planned TS ES(ODT)
  to be brought into use in the next 3 years or to
  be operated prior to the date of bringing into
  use of earth station, falling within its
  coordination area.

B
A
27
Response to Request of Coordination by
Administration B

• Conduct Technical Examination
• Detailed technical examination is not required
  if the TS ES(ODT)
• Are not inside the coordination area or
• Has no frequency overlap or
• With lesser potential are not inside the
  Auxiliary contours
• Interference is within the acceptable level

28
Response to Request of Coordination by
Administration B
Conduct Detailed Technical Examination
Detailed technical examination is required if TS
ES(ODT) inside the coordination contour or
auxiliary contours could cause or receive
unacceptable interference. Exchange of
information like terrain profile, modulation
scheme, precise e.i.r.p and sensitivity may help
administrations to reach coordination agreement
29
Response to Request of Coordination by
Administration B
Coordination agreement is reached (9.52B)
Administration B may agree to the coordination
by requesting the inclusion of its TS ES(ODT)
not yet recorded in the MIFR but are to be
brought into use in the next three years and
sends complete characteristics (AP4 Annex 1A/1B
or 2A/2B) of these stations to Administration A
and the Bureau.
30
Response to Request of Coordination by
Administration B

• Coordination agreement is not reached (9.52)
• Administration B does not agree to the
  coordination request. It shall
• within four months of the date of dispatch of the
  coordination data, inform Administration A of its
  disagreement
• provide information concerning its own
  assignments upon which that disagreement is
  based and
• make such suggestions as it is able to offer with
  a view to satisfactory resolution of the matter.
• A copy of that information shall be sent to the
  Bureau.
• Only that information relating to existing
  radiocommunication stations or to those to be
  brought into use within the next three months for
  terrestrial stations, or three years for earth
  stations, shall be treated as notifications under
  Nos. 11.2 or 11.9.

31
PART V
Computer Program for Determination of
Coordination Area
R1448 for methods specified in Appendix 7
(WRC-2000) (ITU Digitized World Map(IDWM) is
required)(See also Recommendation ITU-R SM.1448)
32
INPUT FILE
USE CREATE INPUT of Program R1448
REC 847 INPUT DATA

IdNo0000001 ADMMLT
CTYMLT PHASED ESTNMAGHTAB
ESCOORDS014E264035N5556 RNCLZNK SAT
INTELSAT GEOSYNCY
GMIN-10. AUXPLOT 1-10. 2-20. 30. 40.
50. 60. AUXPRINTY SQSIDE100 (mm)
PLOTSCALE 150. (km/cm) RECEIVEY
TRANSMITY
RADPATRN 1 MINRCVFRMHZ3700.
MAXRCVFRMHZ4200. SUPCNR ESNOISE 100
RECVANTG59.3 SERVTYPE
0 RECVPC0.00170 MINTRNFRMHZ5925.
MAXTRNFRMHZ6425. SUPCNT POWRDENS-33.
TRANANTG63. TRANPC0.00500
BDIRPC0.00000 SATLONG-1.
MINELA5. INCLINATION0.
SATEAST------- SATWEST-------  
AUXM2 10. 20. 30. 40. 50.
60. NUMELEVPAIR10 AZIMS( 1) 0.
HORELVS( 1) 0.
33
RUNNING CALCULATIONS
34
Results of Calculations and Plots
Four input files are provided Use them to create
the coordination Contours The Handout given to
you contains the Results of Calculations and
Coordination Area Plots Corresponding to all
the four input files