A method to adapt synchronous transmission

H - Electricity – 04 – B

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H04B 7/26 (2006.01) H04B 7/005 (2006.01)

Patent

CA 2197426

A method of adapting synchronous transmission to the rules that apply to asynchronous transmission in a radio medium. In asynchronous transmission, it is decreed that the transmitter/receiver operates in monitoring mode for a given short period of time (tm), in order to establish whether or not transmission shall take place. The synchronous transmission is, for instance, a TDMA transmission for a personal telephone system active over short distances (10 -- 200 m). According to the proposed method, the radio medium is monitored by a synchronous transmitter (PT) over a brief time period (G) between two time slots (T1, T2) and the power (Pm) received is measured and compared with a given prescribed threshold power (Pt) in accordance with asynchronous rules. Permission to transmit can be given on the basis of the results of this comparison.

Procédé d'adaptation d'une transmission synchrone en fonction des règles qui s'appliquent à la transmission asynchrone par l'intermédiaire d'un support radioélectrique. Dans la transmission asynchrone, il est établi que l'émetteur/récepteur fonctionne en mode de surveillance pendant une courte durée (tm) afin de déterminer si la transmission s'effectuera ou non. La transmission synchrone est, par exemple, une transmission AMRT pour un système téléphonique personnel à courte portée (10 à 200 m). Selon le procédé proposé, le support radioélectrique est surveillé par un émetteur synchrone (PT) pendant une courte période (G) comprise entre deux tranches de temps (T1, T2) et la puissance reçue (Pm) est mesurée et comparée, conformément aux règles concernant la transmission asynchrone, avec une puissance de seuil prédéterminée (Pt). Le droit d'émettre peut être accordé en fonction du résultat de cette comparaison.

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