Cdma physical layer packet mechanisms for distributed bursty...

H - Electricity – 04 – L

Patent

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H04L 12/56 (2006.01) H04L 12/28 (2006.01)

Patent

CA 2319809

Disclosed is a new access channel protocol for use in cellular systems such as CDMA whereby the data transfer efficiency of an access message is increased by removing the requirement that a preamble frame and a message capsule frame have equal times of duration. With such removal, the BTS must inform listening MSs as to the time duration of the frames in each of the preamble and the message portions of the access channel time slot in addition to previously supplied information as to the number of frames in each portion. When unequal frame duration times are allowed, each portion of the access channel may be more nearly optimized to the actual time required to perform the functions of synchronization and message detection.

La présente invention concerne un nouveau protocole de canal d'accès destiné aux systèmes cellulaires tel que l'accès multiple par différence de code (AMDC) dans lequel on améliore l'efficacité de transfert de données d'un message d'accès en éliminant l'obligation d'égalité de durée d'exécution ente des trames préambule et capsule de message. Dans un tel cas, la station de transmission de base (BTS) doit informer des stations mobiles (MS) quant à la durée d'exécution des trames dans chacune des parties de préambule et de message du créneau de temps du canal d'accès, en plus de l'information préalablement fournie quant au nombre de trames dans chaque partie. Dans le cas autorisé de durées d'exécution de cadre inégales, la présente invention permet d'optimiser chaque partie du canal d'accès au temps réel, nécessaire à la réalisation des fonctions de synchronisation et de détection de message.

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