Spot beam location method and apparatus

Details Spot beam location method and apparatus Spot beam location method and apparatus

H - Electricity

04

B

H04B 7/185 (2006.01) H04B 7/204 (2006.01)

Patent

CA 2227700

A mobile terminal (6) communicates via a satellite (8), which projects a number of overlapping spot beams (10), with a fixed earth station (2). To determine which spot beam (10) is to be used for communication, the mobile terminal signals in a common signalling channel which is simultaneously received by all, or a subgroup of, the spot beams (10). The satellite (8) retransmits to the fixed earth station (2) in separate channels the signal as received by each of the spot beams (10) which are able to receive the common signalling channel. The relative strengths of the signal as received in the different spot beams (10) are compared at the fixed earth station and a communications channel is assigned to the mobile terminal in one of the spot beams (10), selected according to the comparison of signal strengths.

Un terminal (6) mobile communique, via un satellite (8) projetant un certain nombre de faisceaux (10) étroits se chevauchant, avec une station (2) fixe terrestre. Afin de déterminer quel faisceau étroit (10) utiliser pour une communication, le terminal mobile émet un signal dans une voie de signalisation commune qui est reçue simultanément par tous les faisceaux (10) ou par un sous-groupe de ceux-ci. Le satellite (8) réémet vers la station (2) fixe terrestre, dans des voies séparées, le signal tel que reçu par chacun des faisceaux (10), lesquels peuvent recevoir la voie de signalisation commune. Les amplitudes relatives du signal, telles que reçues dans les différents faisceaux (10), sont comparées au niveau de la station fixe terrestre, et une voie de télécommunication est assignée au terminal mobile dans un des faisceaux étroits (10), lequel est choisi en fonction de la comparaison des amplitudes du signal.

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