Video Delivery in Virtualized Content Distribution Networks and xDSL Optimization
IPTV (Internet Protocol Television) is a new method to delivery television programming, making the TV viewing experience more interactive and personalized. More than simply a new distribution and playback method, IPTV is expected to change the television experience. Similar to how information on the Internet can be downloaded and viewed at any time, IPTV enables television programming to be available whenever each individual consumer desires it. The set of services included in IPTV are commercial grade-multicasting TV, video on demand (VoD), triple play, voice over IP (VoIP), and Web/email access, well beyond traditional cable television services.
On-demand streaming from a remote location through an edge cache server is a challenging problem. When a public Internet scenario is used for the transmission of streaming video, congestion and network latency can occur at any time, significantly impacting the quality of service. The primary technique used to improve the quality of distributed content service is replication. The first goal of this project is to investigate how to optimize content delivery in the cache network. It will be addressed by the Work Package 1(WP1).
DSL (Digital Subscriber Line) is a family of technologies that provide digital data transmission over the local telephone network wires, utilizing the unused bandwidth in the existing copper access network to deliver high-speed data services from the distribution center, or central office, to the end user. Among these DSL technologies are ADSL, ADSL2, ADSL2+ , VDSL and VDSL2. DSL-based services are not just about speed, but about new applications and opportunities. DSL technology is embedded in the scenario for provisioning the highly demanding IPTV services, a challenging task in terms of Quality of Service. Line impairments, such as Impulse Noise and Cross-talk, can degrade service performance to a level that affects subscriber satisfaction considerably, differently from traditional data services which rely on best-effort strategies to cope with such disturbances. The means for ensuring high quality video delivery to the users are needed. DSL technologies provide ways to mitigate noise effects by increasing SNR and data redundancy, at the expense of less bandwidth and higher delay/jitter. Appropriate video codec settings can also contribute with improved QoE (Quality of Experience) by decreasing bandwidth needs to fit line protection settings. An automated tool is needed to continuously monitor and adapt line and video settings for changing noise scenarios. And for such tool to succeed, line and video parameters (and the trade-offs involved) must be considered jointly, making room for a cross-layer optimization strategy. The Work Package 2 (WP 2) will address the coordinated work of xDSL, link and network layers to provide such optimization.
IPTV – WP2
DSL (Digital Subscriber Line) is a family of technologies that provide digital data transmission over the local telephone network wires, utilizing the unused bandwidth in the existing copper access network to deliver high-speed data services from the distribution center, or central office, to the end user. Among these DSL technologies are ADSL, ADSL2, ADSL2+, VDSL and VDSL2. DSL-based services are not just about speed, but about new applications and opportunities. DSL technology is embedded in the scenario for provisioning the highly demanding IPTV services, a challenging task in terms of Quality of Service. Line impairments, such as Impulse Noise and Cross-talk, can degrade service performance to a level that affects subscriber satisfaction considerably, differently from traditional data services which rely on best-effort strategies to cope with such disturbances. The means for ensuring high quality video delivery to the users are needed. DSL technologies provide ways to mitigate noise effects by increasing SNR and data redundancy, at the expense of less bandwidth and higher delay/jitter. To meet the stringent QoS requirements for the transportation of new service-mixes over DSL, a high-grade tunable QoS Optimization Engine is necessary.