System and method for re-synchronization of a pss session to...

H - Electricity – 04 – L

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H04L 29/06 (2006.01)

Patent

CA 2703676

An accurate indication of a re-synchronization point/time in streamed media content is provided to allow playout of the streamed media content from or at a desired point/time when a client or receiver switches from multimedia broadcast multicast service (MBMS) to packet switch stream (PSS) service. Various parameters, e.g., synchronization source (SSRC) and real-time protocol (RTP) timestamp, of a last received media RTP packet is signaled to a receiver. Alternatively, the SSRC and sequence number of the last received media RTP packet is signaled to the receiver, or the SSRC, the RTP timestamp, and the sequence number of the last received media RTP packet is signaled to the receiver. Also, a UTC clock time can be calculated based upon the last received real-time control protocol (RTCP) sender report (SR) and the timestamp of the last received media RTP packet in order to effectuate proper synchronization between MBMS and PSS servers.

Une indication précise d'un point/instant de resynchronisation dans un contenu média transmis en continu est fournie pour permettre de lire ledit contenu à partir d'un point/instant voulu lorsqu'un client ou un récepteur passe d'un service de multidiffusion multimédia (MBMS) à un service de flux par commutation de paquets (PSS). Divers paramètres tels que la source de synchronisation (SSRC) et l'estampille du protocole en temps réel (RTP) du dernier paquet RTP média reçu sont signalés à un récepteur. Dans un autre mode de réalisation, la SSRC et le numéro de séquence du dernier paquet RTP média reçu sont signalés au récepteur, ou la SSRC, l'estampille du RTP et le numéro de séquence du dernier paquet RTP média reçu sont signalés au récepteur. De plus, un temps d'horloge UTC peut être calculé sur la base du dernier rapport d'expéditeur (SR) de protocole de commande en temps réel (RTCP) reçu et de l'estampille du dernier paquet RTP média reçu afin de mettre en uvre une synchronisation appropriée entre des serveurs MBMS et PSS.

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