Short code timing offsets in a cdma system

Details Short code timing offsets in a cdma system Short code timing offsets in a cdma system

H - Electricity

04

B

H04B 7/185 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2413032

A CDMA cellular communications network (400, FIG. 4) includes one or more aircraft (410), which relay pilot channel and control channel signals between base transceiver stations (BTS's 406, 413) and subscriber units (401). Over the control channel, the BTS transmits a handoff candidate list to the subscriber units. The handoff candidate list identifies candidate BTS's to which the subscriber unit, theoretically, could hand off. In addition, the list indicates at which offsets the subscriber units should search for short codes transmitted by the candidate BTS's over the pilot channel. Based on the path length between the BTS, aircraft, and subscriber unit, the candidate BTS's actually generate their short codes at an offset that is equal to or earlier than the offset reported to the subscriber unit by some delta. In addition, the BTS's can impose a variable delay on the generated short code bits to compensate for variations in the path delay as the aircraft flies in its flight pattern.

Cette invention se rapporte à un réseau de communication cellulaire CDMA (400), qui comprend un ou plusieurs avions (410) relayant des signaux de canal de commande et de canal pilote entre des stations émetteurs-récepteurs de base (BTS) (406 et 413) et des unités d'abonnés (401). La station (BTS) transmet aux unités d'abonnés via le canal de commande une liste de candidats à un transfert intercellulaire. Cette liste de candidats à un transfert intercellulaire identifie les stations BTS candidates sur lesquelles l'unité d'abonné pourrait théoriquement se transférer. Cette liste indique en outre avec quels décalages les unités d'abonnés doivent rechercher les codes courts transmis par les stations BTS candidates via le canal pilote. Sur la base de la longueur de trajet entre la station BTS, l'avion et l'unité d'abonné, les stations BTS candidates génèrent elles-mêmes leurs codes courts avec un décalage qui est égal ou antérieur au décalage rapporté par l'unité d'abonné par une valeur delta. Les stations BTS peuvent en outre imposer un retard variable aux bits des codes courts ainsi générés, en vue de compenser les variations de retard de trajet, pendant que l'avion suit sa trajectoire de vol.

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