Method and apparatus for critical time multimedia data...

H - Electricity – 04 – L

Patent

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Details

H04L 12/28 (2006.01) H04L 12/56 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2464508

The invention involves a refinement to conventional data transmi ssion over packet networks (e.g. IP). Conventionally, multimedia streaming systems use either a reliable protocol (e.g. TCP) or an unreliable protocol (e.g. UDP) for the media transmission. Each method has its own benefits. Using a reliable protocol ensures that all the packets arrive at the receiver, but this does require more bandwidth due to protocol overheads and it introduces more delay. An unreliable protocol is lightweight and faster although the data stream may be subjected to packet loss. In the present invention a combination of both protocols is used, where an unreliable protocol is employed initially followed by a reliable protocol at the end of the media clip. The unreliable protocol is used for the low delay transmission of packets while the reliable protocol at the end is used for the transmission of packets that were initially lost.

La présente invention concerne un mode de réalisation permettant d'améliorer la transmission de données classique sur des réseau de commutation par paquets (par exemple, IP). Généralement, les systèmes de transmission multimédia en continu utilisent, soit un protocole fiable (par exemple, TCP), soit un protocole non-fiable (par exemple, UDP) pour la transmission multimédia. Chaque procédé présente ses propres avantages. L'utilisation d'un protocole fiable permet de garantir que tous les paquets parviennent au récepteur, toutefois, ceci nécessite une largeur de bande plus importante en raison du surdébit du protocole, et augmente le retard. Un protocole non-fiable est léger et rapide, toutefois, la lecture en continu des données peut subir des pertes de paquets. Le mode de réalisation décrit dans cette invention consiste à combiner les deux protocoles, le protocole non-fiable étant utilisé au départ et le protocole fiable étant utiliser à la fin de la session de transfert. Le protocole non-fiable est utilisé pour la transmission à faible retard de paquets, alors que le protocole fiable est utilisé à la fin pour la transmission de paquets initialement perdus.

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