Support of multiple modulation levels for a cellular traffic...

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/00 (2006.01) H04Q 7/38 (2006.01) H04Q 7/22 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2282577

A D-AMPS+ cellular communications air interface (50) is presented wherein a packet data control channel (40, 60) and packet data traffic channel (42, 62) are supported in addition to the conventional digital control channel (20) and digital traffic channel (22, 64). In particular, the packet data control channel, packet data traffic channel and digital traffic channel support multiple modulation level operation (high versus low). Procedures are provided for intracell (76, 80, 82) and intercell (92, 94, 96, 98) modulation transition of mobile station communications carried by a traffic channel. In particular, these procedures facilitate intracell and intercell modulation transition to a traffic channel using the same level of modulation, as well as intracell and intercell (fall-forward and fall-backward) modulation transition to a traffic channel using a different level of modulation.

L'invention concerne une interface aérienne de communications cellulaire AMPS numérique +(50) dans laquelle un canal de commande de paquets de données (40, 60) et un canal de trafic de paquets de données (42, 62) sont pris en charge outre le canal de commande numérique classique (20) et le canal de trafic numérique (22, 64). Le canal de commande de paquets de données, le canal de trafic de paquets de données et le canal de trafic numérique permettent un fonctionnement à niveaux de modulation multiples (haut niveau contre bas niveau). Des procédures sont décrites pour la transition de modulation intracellulaire (76, 80, 82) et intercellulaire (92, 94, 96, 98) de communications mobiles acheminées par un canal de trafic. Ces procédures facilitent, notamment, la transition de modulation intracellulaire ou intercellulaire vers un canal de trafic au moyen du même niveau de modulation, ainsi que la transition de modulation intracellulaire et intercellulaire (vers l'avant et vers l'arrière) vers un canal de trafic au moyen d'un niveau de modulation différent.

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