The first paper, by Avramova et al., studies the performance of scalable video coding for VBR TV channels transport with multiple device resolutions and required video quality. The work characterizes the fluctuations of the bit rate associated with one TV channel. The authors explore the conditions under which different transport schemes will be efficient. They compare a simulcast and a scalable video coding (SVC) transport scheme in several realistic use-cases with different encoding modes.
The second paper, by Montpetit, Klym and Mirlacher, presents a vision of IPTV in the next future combining social and mobile aspects. New innovative approaches offer a number of value-added services for operators, and content producers as well as for emerging social networking operators. For example, social networking sites could become “virtual operators” and offer personalized TV services on top of social connectivity. The article addresses the architecture, the value chain and the technical and business challenges associated with connected mobile and social TV. To put the architecture into a context, the authors also present a use case of the distributed community Digital Video Recorder (DVR) as an implementation of this vision.
The third paper, by Stockhammer, Heiles and Lüken, addresses the high bandwidth demands of IPTV. The authors explore Content Download Services (CDSs) as an alternative for operators’ current distribution models. The main contribution of the paper is in the development of selected use cases with CDS architecture and technology as well as their mapping to operators’ business models.
In the fourth paper, Cruz et al., describe the development, implementation and evaluation of a SIP based IPTV architecture with a new dynamic QoS adaptation method and signaling structure. Prototype implementations are described as well as the results of field tests carried out across different fixed and mobile access networks, for each of the signaling methods presented.
Finally, the fifth paper, by Palau et al. proposes an architecture for Wireless IPTV, making traditional IPTV and related services available in heterogeneous networks. They propose an alternative CDN-based architecture to distribute contents to different access networks, creating a triple screen distribution platform. The paper is focused on the wireless components of the system. They analyze their architecture and its performance, based on video coding, and the efficiency obtained by the judicious placement of the streaming servers.