| 摘要 |
<p>Time-shifting and chase-play is provided for an IPTV system, utilising a control channel established between the originating user and a selected IPTV Application Server (IPTV-AS). When time shifting of the IPTV content is required, for example due to receipt of a telephone call, a start time-shift command is sent to the IPTV-AS over the control channel. A start recording command is then sent from the IPTV-AS to a Network PVR system to initiate recording of the current multicast content. Subsequently, when the user is ready to resume viewing of the time-shifted content, a start chase-play command is sent to the IPTV-AS over the control channel to establish a unicast channel for playback of the time-shifted content; and a playback command is sent from the IPTV-AS to the Network PVR system to initiate playback of the time-shifted content over the unicast channel. Such a solution utilizes the standardized IMS communication system and its network architecture and a PVR residing in the Network to limit the traffic transmitted over the first mile connection to a home.</p> |
