Mobile communication without call interruption during...

H - Electricity – 04 – B

Patent

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Details

H04B 7/005 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2195375

In a mobile communication system having a base station and a mobile station, indoor and outdoor antennas are provided in different locations of a building structure that substantially prevents penetration of electromagnetic radiation. A communication unit is connected between the indoor and outdoor antennas. The communication unit is arranged to detect a signal received at the first antenna from the mobile station while the mobile station is communicating with the base station, determines that the mobile station is entering the structure when the detected signal exceeds a predetermined reference level and establishes a radio link between the outdoor antenna and the base station and a circuit between the first and second antennas and commands the mobile station to establish a radio link to the indoor antenna. The radio link established between the mobile station and the indoor antenna uses forward and reverse channels that avoid interference with other mobile stations.

ans un système de communication mobile comportant une station de base et une station mobile, des antennes intérieures et des antennes extérieures sont installées à différents endroits de la structure d'un immeuble où les radiations électromagnétiques ne peuvent pénétrer dans l'immeuble. A chaque endroit, une unité de communication est montée entre les antennes intérieure et extérieure. Elle détecte les signaux reçus de la station mobile à la première antenne pendant que la station mobile communique avec la station de base; elle détermine que la station mobile pénètre dans l'immeuble quand le niveau du signal détecté dépasse un niveau prédéterminé, établit une liaison radio entre l'antenne extérieure et la station de base, ainsi qu'un circuit entre la première et la seconde antennes, et demande à la station mobile d'établir une liaison radio avec l'antenne intérieure. La liaison radio entre la station mobile et l'antenne intérieure utilise des canaux unidirectionnels dans les deux sens qui évitent le brouillage avec les autres stations mobiles.

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