Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint
First Claim
1. A satellite communications frequency sharing system comprising:
- a first satellite communications system that provides satellite communications over a first satellite frequency band in a first footprint via a first satellite; and
a second satellite communications system that provides satellite communications with radioterminals over the first satellite frequency band in a second footprint that is a sub-area of the first footprint, via a second satellite, wherein a receive antenna gain of the second satellite is higher than a receive antenna gain of the first satellite;
wherein an aggregate effective isotropic radiated power of the radioterminals and a receive antenna gain of the first satellite are sufficiently low so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 3.5%.
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Accused Products
Abstract
Two satellite communications systems can use the same frequency or frequencies in geographically overlapping footprints, without creating undue interference in a given system that is caused by the same frequency signal(s) that is/are used by the other system. In particular, an aggregate Effective Isotropic Radiated Power (EIRP) of the radioterminals and/or ancillary terrestrial components of a second satellite communications system in the common footprint is sufficiently low, and/or the receive antenna gain of a first satellite communications system is sufficiently low compared to the receive antenna gain of the second satellite communications system, so as to increase an aggregate receiver noise that is seen by the first satellite system receivers by an amount that does not substantially change a Quality of Service (QoS) of the first satellite communications system.
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Citations
61 Claims
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1. A satellite communications frequency sharing system comprising:
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a first satellite communications system that provides satellite communications over a first satellite frequency band in a first footprint via a first satellite; and a second satellite communications system that provides satellite communications with radioterminals over the first satellite frequency band in a second footprint that is a sub-area of the first footprint, via a second satellite, wherein a receive antenna gain of the second satellite is higher than a receive antenna gain of the first satellite; wherein an aggregate effective isotropic radiated power of the radioterminals and a receive antenna gain of the first satellite are sufficiently low so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 3.5%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A satellite communications frequency sharing system comprising:
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a first satellite communications system that provides satellite communications over a first satellite frequency band in a first footprint via a first satellite; and a second satellite communications system that provides satellite communications with radioterminals over the first satellite frequency band in a second footprint that is a sub-area of the first footprint, via a second satellite, wherein a receive antenna gain of the second satellite is higher than a receive antenna gain of the first satellite; wherein the second satellite communications system also provides terrestrial communications between the radioterminals and at least one ancillary terrestrial component over the first satellite frequency band in the second footprint; and wherein an aggregate effective isotropic radiated power of the radioterminals and/or the at least one ancillary terrestrial component is sufficiently low so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 6.75%. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A satellite communications frequency sharing system comprising:
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a first satellite communications system that provides satellite communications over a first satellite frequency band in a first footprint via a first satellite; and a second satellite communications system that provides satellite communications with radioterminals over the first satellite frequency band in a second footprint that is a sub-area of the first footprint, via a second satellite, wherein a receive antenna gain of the second satellite is higher than a receive antenna gain of the first satellite; and wherein a receive antenna gain of the second satellite is at least about 20 dB higher than a receive antenna gain of the first satellite. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A satellite communications frequency sharing system comprising:
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a plurality of first radioterminals that communicate with a first satellite communications system over a first satellite frequency band in a footprint at a first aggregate effective isotropic radiated power; and a plurality of second radioterminals that communicate with a second satellite communications system over the first satellite frequency band in the footprint at a second aggregate effective isotropic radiated power that is less than the first aggregate effective isotropic radiated power; wherein the second aggregate effective isotropic radiated power is sufficiently less than the first aggregate effective isotropic radiated power so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 3.5%. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A satellite communications frequency sharing system comprising:
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a plurality of first radioterminals that communicate with a first satellite communications system over a first satellite frequency band in a footprint at a first aggregate effective isotropic radiated power; and a plurality of second radioterminals that communicate with a second satellite communications system over the first satellite frequency band in the footprint at a second aggregate effective isotropic radiated power that is less than the first aggregate effective isotropic radiated power; wherein at least some of the second radioterminals also communicate terrestrially with at least one ancillary terrestrial component over the first satellite frequency band in the footprint; and wherein the second aggregate effective isotropic radiated power and/or an aggregate effective isotropic radiated power of the at least one ancillary terrestrial component and/or an aggregate effective isotropic radiated power of the at least some of the second radioterminals that also communicate terrestrially with the at least one ancillary terrestrial component is sufficiently less than the first aggregate effective isotropic radiated power so as to increase an aggregate noise that is seen by the first satellite radioterminal communications system by less than about 6.75%. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A satellite communications frequency sharing method for a first satellite communications system that provides satellite communications over a first satellite frequency band in a first footprint via a first satellite, the method comprising:
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communicating between radioterminals and a second satellite communications system over the first satellite frequency band in a second footprint that is a sub-area of the first footprint via a second satellite, wherein a receive antenna gain of the second satellite is higher than a receive antenna gain of the first satellite; wherein an aggregate effective isotropic radiated power of the radioterminals and a receive antenna gain of the first satellite are sufficiently low so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 3.5%. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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43. A satellite communications frequency sharing method for a first satellite communications system that provides satellite communications over a first satellite frequency band in a first footprint via a first satellite, the method comprising:
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communicating between radioterminals and a second satellite communications system over the first satellite frequency band in a second footprint that is a sub-area of the first footprint via a second satellite, wherein a receive antenna gain of the second satellite is higher than a receive antenna gain of the first satellite; and communicating terrestrially between at least some of the radioterminals and at least one ancillary terrestrial component over the first satellite frequency band in the second footprint; wherein an aggregate effective isotropic radiated power of the radioterminals and/or the at least one ancillary terrestrial component is sufficiently low so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 6.75%. - View Dependent Claims (44, 45, 46, 47, 48)
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49. A satellite communications frequency sharing method for a first satellite communications system that provides satellite communications over a first satellite frequency band in a first footprint via a first satellite, the method comprising:
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communicating between radioterminals and a second satellite communications system over the first satellite frequency band in a second footprint that is a sub-area of the first footprint via a second satellite, wherein a receive antenna gain of the second satellite is higher than a receive antenna gian of the first satellite; wherein a receive antenna gain of the second satellite is at least about 20 dB higher than a receive antenna gain of the first satellite. - View Dependent Claims (50, 51, 52, 53)
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54. A satellite communications frequency sharing method for a plurality of first radioterminals that communicate with a first satellite communications system over a first satellite frequency band in a footprint at a first aggregate effective isotropic radiated power, the method comprising:
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communicating between a plurality of second radioterminals and a second satellite communications system over the first satellite frequency band in the footprint at a second aggregate effective isotropic radiated power that is less than the first aggregate effective isotropic radiated power; wherein the second aggregate effective isotropic radiated power is sufficiently less than the first aggregate effective isotropic radiated power so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 3.5%. - View Dependent Claims (55, 56, 57)
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58. A satellite communications frequency sharing method for a plurality of first radioterminals that communicate with a first satellite communications system over a first satellite frequency band in a footprint at a first aggregate effective isotropic radiated power, the method comprising:
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communicating between a plurality of second radioterminals and a second satellite communications system over the first satellite frequency band in the footprint at a second aggregate effective isotropic radiated power that is less than the first aggregate effective isotropic radiated power; and communicating terrestrially between at least some of the second radioterminals and at least one ancillary terrestrial component over the first satellite frequency band in the footprint; wherein the second aggregate effective isotropic radiated power and/or an aggregate effective isotropic radiated power of the at least one ancillary terrestrial component is sufficiently less than the first aggregate effective isotropic radiated power so as to increase an aggregate noise that is seen by the first satellite communications system by less than about 6.75%. - View Dependent Claims (59, 60, 61)
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Specification