Method and system for realizing nonloss transmission of...

H - Electricity – 04 – W

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H04W 12/02 (2009.01) H04W 88/16 (2009.01) H04W 92/02 (2009.01) H04L 12/46 (2006.01)

Patent

CA 2699437

A method for realizing non-loss transmission of media stream after switching between the open call and the secret call, the method includes the steps: after the base station receiving the message of switching from the open call to the secret call tom the communication terminal, inserting a special media frame in the media stream and transmitting it to the media gateway; the media gateway judging whether checking the special media frame according to the form of the load-bearing of he media stream's incoming and outgoing or the form of the media' s codingdecoding, whether detect the special media frame or not, the media gateway transmitting the media stream from the incoming to the outgoing. When the special media frame is detected, deciding to transmit directly or run an PCM adaptation process in 64kbps/56kbps according to the form of the codingdecoding.

L'invention porte sur une méthode de réalisation de transmissions sans pertes de flux de média suite à une commutation entre un appel ouvert et un appel secret. La méthode comporte les étapes suivantes: après que la station de base ait reçue du terminal de communication le message de commutation de l'appel ouvert à l'appel secret, on insert un cadre de média spécial dans le flux de média et on le transmet à une passerelle de média qui juge si elle doit ou non vérifier le cadre de média spécial selon la forme de la charge du flux de média entrant ou sortant ou selon la forme du codage/décodage de média. Selon qu'elle détecte ou non le cadre de média spécial, la passerelle de média transmet ou non le flux de média de l'entrant au sortant, et lorsque le cadre de média spécial est détecté, elle décide de le transmettre directement ou d'exécuter une procédure d'adaptation PCM en 64kbps/56kbps selon la forme du codage/décodage.

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