Analysis of MSS allocations suggests they fall into seven groups which appear in the following table:
|
MSS Group |
Description |
ITU Allocations |
|
Group I |
Commercial Geo stationary Orbital (GSO) Satellites |
Four allocations for downlinks and uplinks on a primary basis ranging from 1525-1544 MHz to 1646.5-1660.5 MHz.
14.0-14.5 GHz world-wide primary allocation for LMSS uplinks.
20.1-20.2 GHz and 29.9-30.0 GHz world-wide primary MSS allocations shared with FSS.
117.975-137.0 MHz world-wide secondary allocation |
|
Group II |
Government Networks |
There are three sets of allocations (downlinks and uplinks) used for government (military) uses.
235.0-322.0 MHz and 335.4-399.9 MHz.
7250-7375 MHz and 7900-8025 MHz.
20.2-21.2 GHz and 30.0-31.0 GHz |
|
Group III |
Non-commercial GSO < 1 GHz |
There are seven allocations for LMSS between 100 MHz and 1 GHz. These allocations are in highly congested spectrum. |
|
Group IV |
Non-GSO Major System Bands |
11 bands for either uplinks or downlinks ranging from 1492-1525 MHz to 2655-2690 MHz.
One of the bands previously allocated was reallocated to IMT-2000 (2170-2200 MHz). |
|
Group V |
Millimeter-wave MSS Bands |
Nine bands above 40 GHz which are lightly used. |
|
Group VI |
MSS Distress and Safety Bands |
121.45-121.55 MHz, 242.95-243.05 MHz, 406.0-406.1 MHz,
and |
|
Group VII |
Feeder Links - The following FSS allocations are used worldwide on an exclusive basis for MSS feeder links. |
5091-5150 MHz for non-GSO MSS: becomes a secondary allocation after 2010.
5150-5250 MHz for non-GSO MSS: a primary allocation.
6700-7075 MHz for non-GSO MSS: a primary allocation.
15.43-15.63 GHz for non-GSO MSS: a primary allocation |