Method and apparatus for common packet channel assignment

Details Method and apparatus for common packet channel assignment Method and apparatus for common packet channel assignment

H - Electricity

04

W

H04W 72/02 (2009.01)

Patent

CA 2401393

A method and device for initiating uplink data packet communication from a mobile device to a base station on a common packet channel is initiated when the mobile device reads broadcast status of common packet channels, after which the mobile device sends an access preamble to the base station that is acknowledged by the base station, and then the mobile device sends a collision preamble which the base station answers with a matching collision response. If the base station's response to the collision preamble also includes a channel allocation message, then the base station begins uplink data packet communication on an allocated channel provided that the allocated channel previously had free broadcast status. However, if the base station's response to the collision preamble includes a channel allocation message designating channel(s) not previously having free broadcast status, then the mobile device's access attempt is aborted.

L'invention concerne un procédé et un dispositif permettant d'initialiser une communication de paquets de données montante, d'un dispositif mobile à une station de base sur un canal sémaphore de paquets, celle-ci étant initialisée lorsque le dispositif mobile lit l'état de diffusion des canaux sémaphores de paquets, suite à quoi le dispositif mobile envoie un préambule d'accès à la station de base, accusé de réception par la station de base, puis le dispositif mobile envoie un préambule de collision auquel répond la station de base avec une réponse de collision correspondante. Si la réponse de la station de base au préambule de collision comprend également un message d'attribution de canaux, la station de base initialise alors une communication de paquets de données montante sur un canal attribué à condition que l'état de diffusion du canal attribué ait été préalablement libre. Cependant, si la réponse de la station de base au préambule de collision comprend un message d'attribution de canaux désignant des canaux dont l'état de diffusion n'ait pas été préalablement libre, la tentative d'accès du dispositif mobile est interrompue.

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