Dual mode symmetric/asymmetric communication control system

H - Electricity – 04 – B

Patent

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Details

H04B 7/185 (2006.01) H04B 7/15 (2006.01)

Patent

CA 2269225

A satellite-cellular communication system includes a satellite based transceiver for transceiving two-way communications originated at a user terminal. As a part of call set up, controller determines whether the user terminal should transmit in the uplink in either a wide band mode of operation or in a narrow band mode of operation. The controller then specifies to the user terminal the mode of operation through the transceiver. Whether the user terminal transmits in the uplink in a wide band or in a narrow band mode depends upon factors including the type of device, channel usage and efficiency in the channels to and from the satellite transceiver and the signal quality of the signals received at the transceiver.

L'invention concerne un système de communication cellulaire par satellite, qui comprend un émetteur-récepteur par satellite, lequel est destiné à émettre et recevoir des communications bilatérales provenant d'un terminal utilisateur. Une unité de commande participant à l'établissement des communications détermine si le terminal utilisateur doit émettre en mode large bande ou en mode bande étroite dans le trajet Terre-espace. L'unité de commande précise ensuite le mode de fonctionnement au terminal utilisateur à travers l'émetteur-récepteur. Le terminal utilisateur émet dans le trajet Terre-espace soit en mode large bande soit en mode bande étroite, en fonction de facteurs tels que le type de dispositif, l'utilisation des canaux et l'efficacité des canaux vers et à partir de l'émetteur-récepteur par satellite et la qualité des signaux reçus par l'émetteur-récepteur.

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