Coordination For Satellite Networks

Presentation / Coordination For Satellite Networks

Date Submitted: 02 October 2001

Written by RPC Telecommunications. Website:

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Covers topics including Satellite Coordination Background, Satellite - Terrestrial and Satellite - Satellite Coordination and the role of the ITU in coordination.

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 Printable Version
-Section 1
Satellite Coordination Background
-Section 2
What Is Coordination?
-Section 3
Key Issues
-Section 4
Frequency Allocations
-Section 5
Satellite - Terrestrial Coordination
-Section 6
Satellite - Satellite Coordination
-Section 7
Frequency Allocations
Frequencies are allocated by the ITU at "World Radiocommunication Conferences". Allocations are made on a regional basis and are made for different services. First space allocations were made in WARC-63 and have been updated regularly since.
ITU Radio Regulations
The Radio Regulations define the "law" relating to the use of spectrum. International frequency allocations are defined in article S5 and all administrations must adhere to these allocations. The only exception is use on a non-interference basis.

Article S5: Regions

Allocation For Different Services
Fixed Satellite Service
"A radiocommunication service between earth stations at given positions, when one or more satellites are used; the given position may be a specified fixed point or any fixed point within specified areas; in some cases this service includes satellite-to-satellite links, which may also be operated in the inter-satellite service; the fixed-satellite service may also include feeder links for other space radiocommunication services"

Broadcasting Satellite Service
"A radiocommunication service in which signals transmitted or retransmitted by space stations are intended for direct reception by the general public"

Mobile Satellite Service
"A radiocommunication service: between mobile earth stations and one or more space stations, or between space stations used by this service; or between mobile earth stations by means of one or more space stations. This service may also include feeder links necessary for its operation"

Space Operations Service
"A radiocommunication service concerned exclusively with the operation of spacecraft, in particular space tracking, space telemetry and space telecommand"

Article S5: Detail (example)

Main FSS Allocations
Downlink Uplink
3.4 - 4.2 and 4.5 - 4.8 5.725 - 7.075

7.25 - 7.75

7.9 - 8.4
10.7 - 11.7 23.5 - 13.25 (region 1)
*11.7 - 12.2 12.7 - 13.25 (region 2)
13.75 - 14.0
*14.0 - 14.8
12.5 - 12.75 (regions 1 & 3) 12.75 - 13.25
17.3 - 18.4
17.7 - 21.2 27.5 - 31.0
37.5 - 40.5 40.5 - 42.5 (regions 2 & 3)
42.5 - 43.5
47.2 - 50.2
50.4 - 51.4
Almost all these bands are shared with other services. Inter-service sharing issues are thus very significant and much time is spent ensuring that the different services are compatible - detailed studies are made before a band is allocated at at WRC. Small-dish satellite systems are especially limited by sharing with terrestrial services. In Europe and North America the bands marked * in the table above are generally kept free of terrestrial systems to assist small-dish satellite operations.

Next: Section 5 - Satellite - Terrestrial Coordination


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