Transmission of notifications for broadcast and multicast...

H - Electricity – 04 – W

Patent

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Details

H04W 68/00 (2009.01) H04H 60/91 (2008.01) H04L 27/02 (2006.01) H04L 29/02 (2006.01)

Patent

CA 2556036

To transmit notification indicators for broadcast and multicast services, a base station maps the services to random sequences based on their identifiers. The base station generates the random sequence for each service based on a hash function or a PN generator and the service identifier. Each random sequence is associated with a specific location for sending a notification indicator in each frame. The locations for the notification indicators for each random sequence are randomized with respect to the locations for the notification indicators for each remaining random sequence. This randomness characteristic reduces the likelihood of false alarm. For each service, the base station sets the notification indicators to the same notification value in each modification period. The base station transmits the notification indicators for each service at the random locations determined by the random sequence for the service.

La présente invention a trait à la transmission de services de diffusion et de multidiffusion, dans laquelle une station de base établit une correspondances des services à des séquences aléatoires en fonction de leurs identifiants. La station de base génère la séquence aléatoire pour chaque service selon une fonction d'adressage dispersé ou un générateur de pseudo-aléas et l'identifiant de service. Chaque séquence aléatoire est associée à un site spécifique pour l'envoi d'un indicateur de notification dans chaque trame. Les sites pour les indicateurs de notification pour chaque séquence aléatoire sont randomisés par rapport aux sites pour les indicateurs de notification pour chaque séquence aléatoire restante. Cette caractéristique aléatoire réduit la probabilité de fausse alerte. Pour chaque service, la station de base établit les indicateurs de notification à la même valeur de notification dans chaque période de modification. La station de base transmet les indicateurs de notification à des sites aléatoires déterminés par la séquence aléatoire pour le service.

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