Mobile object information sharing system

H - Electricity – 04 – W

Patent

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Details

H04W 4/02 (2009.01) H04W 64/00 (2009.01) H04B 7/212 (2006.01)

Patent

CA 2582184

[PROBLEMS] To provide a system for sharing data such as positional information by using one common frequency between a plurality of mobile stations to transmit/receive the data. The system is intended to avoid overlap of the transmissions by taking synchronizations with a common timing by the GPS and by performing the transmissions at timings predetermined for individual stations and made different from each other. However, it is impossible to change the transmission frequency, if intended, only for a specific station owing to circumstances. [MEANS FOR SOLVING THE PROBLEMS] A transmission period determining unit (22) is provided for determining the transmission period on the basis of the moving velocity of a mobile station (1). A time synchronization is taken with the time data of the GPS between the individual mobile stations. The synchronous time is followed by a fundamental transmission period composed of a plurality of time slots. Only one time slot is transmitted in one fundamental transmission period so as to elongate the period, but the transmission times are increased to two or three in one fundamental transmission period so as to shorten the period.

L~invention concerne un système de partage de données, telles que des informations de position, entre une pluralité de stations mobiles à l~aide d~une fréquence commune en vue de transmettre et de recevoir les données. Le système est conçu pour éviter le chevauchement des transmissions par synchronisation sur la période temporelle d~un GPS et par réalisation des transmissions à des périodes temporelles prédéterminées différentes pour des stations individuelles. Le système permet toutefois de modifier au besoin la fréquence de transmission pour une station particulière en fonction des circonstances. Selon l~invention, un module de détermination de période de transmission (22) détermine la période de transmission en fonction de la vitesse de déplacement d~une station mobile (1). Les données du GPS sont synchronisées entre les stations mobiles individuelles. La synchronisation est suivie d~une période de transmission élémentaire contenant une pluralité de tranches de temps. Une seule tranche de temps est transmise au cours d~une période de transmission élémentaire de manière à étendre la période alors que les durées de transmission sont doublées ou triplées au cours d~une période de transmission élémentaire de manière à raccourcir la période.

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