Dual mode portable telephone unit

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/32 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2267208

A method and apparatus enabling operation of a dual mode TDNA portable telephone unit (12) are disclosed. The first mode (20) of operation enables synchronous communication up to 75 kilometers. In the second mode (22) of operation, the portable telephone unit (12) operates according to a frame structure (24) enabling synchronization between the portable telephone unit (12) and the base station (10) for ranges greater then 75 kilometers. This increased range is achieved by moving the transmission timeslot (24c) within the frame structure (24) of a TDMA transmission in the second mode (22) to a later timeslot than in the frame structure (24) of the first mode (20).

L'invention concerne une méthode et un appareil assurant le fonctionnement d'une unité de téléphone portable (12) double mode à accès multiple par répartition dans le temps (AMRT). Le premier mode de fonctionnement (20) permet la communication synchrone à des distances allant jusqu'à 75 kilomètres. Dans le second mode de fonctionnement (22), l'unité de téléphone portable (12) fonctionne selon une structure de trame (24) qui permet de synchroniser l'unité de téléphone portable (12) et la station de base (10) à des distances supérieures à 75 km. La portée a été augmentée par déplacement de la tranche de temps de transmission (24c) à l'intérieur de la structure de la trame (24) d'une transmission AMRT dans le second mode (22) vers une tranche de temps qui est en retard par rapport à la structure de la trame (24) du premier mode (20).

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