Network PVR Bandwidth Management for IPTV
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Solution Overview
Problem
IPTV systems face bandwidth limitations in the 'first mile' of broadband access, making it challenging to deliver multiple channels simultaneously due to limited bandwidth, and existing time-shift/chase-play solutions rely on proprietary networks or home-based Private Video Recorders, which burden the connection.
Innovation Solution
A Network Private Video Recorder (N-PVR) system that records content within the network, allowing users to time-shift and chase-play IPTV content using standardized IMS communication, switching from multicast to unicast delivery when needed, thereby reducing bandwidth usage over the first mile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linear content delivery is used to deliver all channels simultaneously, then channel variety is improved, but bandwidth consumption exceeds the limited first mile capacity
Solution Approach 1:
The patent segments channel delivery into two types: live channels delivered via multicast (efficient for simultaneous viewing) and time-shifted channels delivered via unicast (efficient for sequential access). This segmentation allows the system to deliver multiple channels without consuming proportional bandwidth for all channels simultaneously, resolving the contradiction between channel variety and bandwidth consumption.
Solution Approach 2:
The Network PVR records live broadcast content in advance and stores it in the network before the user needs to watch it. When a user requests time-shifted content, the system retrieves the pre-recorded content from the network rather than transmitting it live. This preliminary recording action eliminates the need to maintain high bandwidth for all channels simultaneously while still providing access to multiple channels.
2Ease of operation
If a home-based Private Video Recorder is used for time-shift functionality, then user flexibility is improved, but the first mile connection is burdened with recording traffic
Solution Approach 1:
The patent introduces a Network PVR as an intermediary between the broadcast network and the user's home. The Network PVR performs the recording function in the network infrastructure rather than at the user's premises. This intermediary approach allows users to access time-shifted content without requiring their home connection to handle recording traffic, thus improving user flexibility while avoiding burdening the first mile connection.
3Reliability
If multiple channels are delivered over the first mile, then service quality is improved, but the limited bandwidth is insufficient for high-quality content
Solution Approach 1:
The patent dynamically adjusts the delivery method based on user needs: multicast for live channels when bandwidth is abundant, and unicast for time-shifted channels when bandwidth is constrained. This dynamic adaptation allows the system to maintain service quality by selecting the most efficient delivery mechanism for each channel type, resolving the contradiction between service quality and available bandwidth.
Data Source
AI summary
A system and method for time-shifting and chase-play for an IPTV system. A control channel is established between an originating user's set top box (STB) and an IPTV Application Server (IPTV-AS) utilizing SIP signaling over an IP Multimedia Subsystem. For time-shifting, the STB sends a start time-shifting command to the IPTV-AS over the control channel, and the IPTV-AS sends a start recording command to a Network Private Video Recorder (N-PVR). When the user is ready to resume viewing, the STB sends a start chase-play command to the IPTV-AS to establish a unicast channel. The IPTV-AS sends a playback command to the N-PVR to begin playback of the time-shifted content.