Radio communications systems and methods for jittered beacon...

H - Electricity – 04 – M

Patent

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Details

H04M 1/00 (2006.01) H04Q 7/32 (2006.01) H04Q 7/36 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2264746

Radio beacon transmission between a private radio communications base station and a mobile terminal within the transmission range of the private radio communications base station designed to prevent interference with overlapping uncoordinated private radio communications networks is provided by jittered beacon transmission. The private base station transmits radio beacon bursts at jittered time intervals, which vary pseudo-randomly to prevent repeated radio beacon collisions between uncoordinated private radio communications networks with overlapping transmission ranges. The beacon time jittering is performed pseudo-randomly in a pattern which is associated with a base station identification value. The mobile terminal derives the base station associated identification value and status information from a received radio beacon and determines if the base station is available for communications with the mobile terminal. The mobile terminal further synchronizes with the jittered base station beacon transmissions based on the pre-determined jitter generation function associated with the base station identification value derived from the received radio beacon. The mobile terminal is thereby able to readily maintain synchronization with one or more private radio communications network base stations without losing synchronization due to repeated radio beacon burst collisions between the base stations.

L'invention concerne la transmission par radiobalises entre une station de base de communication radio privée et un terminal mobile, dans la plage de transmission de la station de base de communication radio privée. Cette transmission, conçue pour éviter toute interférence avec les réseaux de communication radio privés non coordonnés se chevauchant, est assurée par la transmission de signaux de balises instables. La station de base privée transmet des rafales de radiobalises à des intervalles de temps instables, qui varient, de manière pseudo-aléatoire, pour éviter les collisions répétées de radiobalises entre les réseaux de communication radio privés non coordonnés dont les plages de transmission se chevauchent. L'instabilité du temps de la balise est assurée de manière pseudo-aléatoire selon un schéma qui est associé à une valeur d'identification de la station de base. Le terminal mobile dérive les informations relatives à la valeur d'identification associée de la station de base et à son état à partir d'un signal de radiobalise reçu et détermine si la station de base est disponible pour des communications avec le terminal mobile. Ce dernier est synchronisé, en outre, sur les transmission de la balise de la station de base instable en fonction de la génération d'instabilité prédéterminée associée à la valeur d'identification de la station de base dérivée à partir du signal de radiobalise reçu. Le terminal mobile peut ensuite maintenir rapidement la synchronisation avec une ou plusieurs stations de base de réseau de communication radio privé sans perdre la synchronisation en raison de collisions de rafales de radiobalises répétées entre les stations de base.

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