Systems, methods and devices for overlaid operation of...

H - Electricity – 04 – B

Patent

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H04B 7/185 (2006.01)

Patent

CA 2732621

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.

Selon linvention, un système de communication comprend un réseau basé sur lespace (SBN) comprenant une pluralité de faisceaux étroits utilisant un premier ensemble de fréquences et un réseau terrestre auxiliaire (ATN) comprenant une pluralité de stations de base utilisant un deuxième ensemble de fréquences radio. Dans une zone de couverture dun faisceau étroit donné, dans laquelle le SBN et lATN utilisent en commun au moins une fréquence des premier et deuxième ensembles de fréquences, le SBN utilise une largeur de bande plus étroite que lATN dans les liaisons aller et retour, lATN utilise un étalement en fréquence sur au moins ses communications de liaison retour, le SBN utilise une annulation de faisceau spatial orientée vers au moins un composant de réseau terrestre (ATC) de lATN, le SBN utilise un contrôle de marge de liaison aller, lATN utilise un contrôle de puissance de liaison retour, le SBN utilise un contrôle de puissance de liaison retour et des stations de base de lATN permettent un isolement dans la direction dau moins un satellite du SBN. En utilisant une telle combinaison, lATN et le SBN peuvent supporter totalement ou partiellement lutilisation avec recouvrement des premier et deuxième ensembles de fréquences radio.

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