SYSTEMS, METHODS AND DEVICES FOR OVERLAID OPERATIONS OF SATELLITE AND TERRESTRIAL WIRELESS COMMUNICATIONS SYSTEMS
First Claim
1. A communications system comprising:
- a space-based network (SBN) comprising at least one satellite that generates a plurality of spot beams using a first set of frequencies; and
an ancillary terrestrial network (ATN) using a second set of radio frequencies,wherein, in a coverage zone of a given spot beam wherein the SBN and the ATN use at least one frequency from the first and second sets of frequencies in common the SBN uses a narrower bandwidth than the ATN on both forward and return links, the ATN employs frequency spreading on at least its return link communications, the SBN employs spatial beam nulling directed toward at least one ancillary terrestrial component (ATC) of the ATN, the SBN employs forward link margin control, the ATN employs return link power control, the SBN employs return link power control and base stations of the ATN provide isolation in the direction of at least one satellite of the SBN.
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Accused Products
Abstract
A communications system includes a space-based network (SBN) including a plurality of spotbeams using a first set of frequencies and an ancillary terrestrial network (ATN) including a plurality of base stations using a second set of radio frequencies. In a coverage zone of a given spot beam wherein the SBN and the ATN use at least one frequency from the first and second sets of frequencies in common, the SBN uses a narrower bandwidth than the ATN on both forward and return links, the ATN employs frequency spreading on at least its return link communications, the SBN employs spatial beam nulling directed toward at least one ancillary terrestrial component (ATC) of the ATN, the SBN employs forward link margin control, the ATN employs return link power control, the SBN employs return link power control and base stations of the ATN provide isolation in the direction of at least one satellite of the SBN. Using such a combination of measures, the ATN and the SBN may support completely or partially overlapping use of the first and second sets of radio frequencies.
66 Citations
42 Claims
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1. A communications system comprising:
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a space-based network (SBN) comprising at least one satellite that generates a plurality of spot beams using a first set of frequencies; and an ancillary terrestrial network (ATN) using a second set of radio frequencies, wherein, in a coverage zone of a given spot beam wherein the SBN and the ATN use at least one frequency from the first and second sets of frequencies in common the SBN uses a narrower bandwidth than the ATN on both forward and return links, the ATN employs frequency spreading on at least its return link communications, the SBN employs spatial beam nulling directed toward at least one ancillary terrestrial component (ATC) of the ATN, the SBN employs forward link margin control, the ATN employs return link power control, the SBN employs return link power control and base stations of the ATN provide isolation in the direction of at least one satellite of the SBN. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a communications system comprising an SBN comprising a plurality of spotbeams using a first set of frequencies and an ATN using a second set of radio frequencies, the method comprising:
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operating the SBN and the ATN such that, in a given coverage zone of a given spot beam the SBN and the ATN use at least one frequency from the first and second sets of frequencies in common and, in the given coverage zone; the SBN using a narrower bandwidth than the ATN on both forward and return links; the ATN employing frequency spreading on at least its return link communications; the SBN employing spatial beam nulling directed toward at least one ATC of the ATN; the SBN employing forward link margin control; the ATN employing return link power control; the SBN employing return link power control; and base stations of the ATN providing isolation in the direction of at least one satellite of the SBN. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A communication system comprising:
an SBN comprising at least one satellite that generates a plurality of spot beams using a set of frequencies and configured, in a coverage zone of a given spot beam wherein the SBN and an ATN use at least one frequency in common, to use a narrower bandwidth than the ATN on both forward and return links, to employ spatial beam nulling directed toward at least one ancillary terrestrial component (ATC) of the ATN, to employ return link power control and to employ forward link margin control. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. A communications system comprising:
an ATN comprising a plurality of ATCs, each comprising at least one base station, the ATN configured, in a coverage zone of a given spot beam wherein an SBN and the ATN use at least one frequency in common, to use a bandwidth broader than the SBN on both forward and return links, to employ frequency spreading on at least its return link communications, to employ return link power control and to provide isolation of ATN base stations in the direction of at least one satellite of the SBN. - View Dependent Claims (39, 40, 41, 42)
Specification