A random access scheme for mobile satellite communications

Details A random access scheme for mobile satellite communications A random access scheme for mobile satellite communications

H - Electricity

04

B

H04B 7/212 (2006.01) H04B 7/185 (2006.01)

Patent

CA 2248015

A method for transmitting random access signals from a mobile unit to a satellite or other control station which requires the transmission of less information than in conventional terrestrial cellular or proposed mobile satellite systems. According to the method, the mobile unit acquires synchronization from the satellite and transmits reduced random access information to the satellite, and the satellite calculates time adjustment information for the mobile units based on the reduced random access information. The random access information is reduced by representing a slot number to each mobile unit, and by transmitting only the odd or even status of the frame number desired by the mobile unit.

L'invention concerne un procédé de transmission de signaux d'accès aléatoire d'une unité mobile à un satellite ou autre station de commande qui exige la transmission de moins d'informations que dans des systèmes cellulaires terrestres classiques ou des systèmes mobiles par satellite proposés. Selon le procédé, l'unité mobile acquiert une synchronisation à partir du satellite et transmet des informations réduites d'accès aléatoire au satellite, et le satellite calcule des informations de resynchronisation pour les unités mobiles en fonction des informations réduites d'accès aléatoire. On réduit les informations d'accès aléatoire en fournissant un numéro de créneau à chaque unité mobile et en transmettant uniquement l'état impair ou pair du numéro de trame désiré par l'unité mobile.

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