Shuichi Aoki

Effective usage of MMT in broadcasting systems

The environment surrounding content delivery has significantly changed since the early 1990s when todays broadcasting systems were developed; content, client terminals, and delivery networks have diversified. To respond effectively to this increasing diversity, new media transport technologies are required to maximize the benefits of heterogeneous networks such as broadcast and broadband networks. This paper presents a functional comparison of MPEG Media Transport (MMT), being developed in MPEG, with MPEG-2 TS and RTP of conventional broadcasting systems. This comparison shows that MMT is the most effective media transport method for next-generation broadcasting systems. We also consider how to implement MMT in broadcasting systems. This study shows that a TLV multiplexing scheme in broadcasting systems is the most efficient way to carry IP packets containing MMT packets.

Efficient multiplexing scheme for IP packets over the advanced satellite broadcasting system

Implementing an IP-friendly transport mechanism in broadcasting systems would enable more convenient multimedia broadcasting applications. The overhead of current multiplexing methods for IP packets that are based on MPEG-2 systems is large, and they are not well suited for efficient transmission of IP packets. We developed an efficient scheme for transporting IP packets over broadcasting channels. The scheme includes compression of IP header information, transmission control signals for listing IP multicast group addresses, and a simple encapsulation. This paper describes the multiplexing scheme and its theoretical overhead. We conducted an experiment on a prototype transmission system that shows our scheme is efficiency.

Development of MMT-based broadcasting system for hybrid delivery

An UHDTV broadcasting system employing MPEG Media Transport (MMT) as its media transport protocol has been proposed for hybrid delivery of content. On the basis of this proposal, an MMT-based UHDTV broadcasting system has already been standardized and is being developed in Japan. This paper describes the structure of that system. The system supports hybrid delivery and has mechanisms to carry Universal Time Coordinated (UTC) information to eliminate clock drift between the sender and receiver. We evaluated the delay variation of UTC information through the use of a broadcast modulator/demodulator we developed and proved that it is small enough. We also conducted an experiment through an actual broadband network to confirm the functionality of hybrid delivery. The experimental results show that audio/video signals could be presented in synchronization with each other even though they are delivered separately over broadcast channels and broadband networks.

Effective content delivery method for file-based broadcast system over satellite broadcasting channels

We propose a new efficient file-transport mechanism, which is required for constructing a hybrid content delivery system incorporating broadcasting and telecommunication. Such a system combines different types of delivery channels to make effective content delivery possible. In the system, files of coded audio/video and metadata are transferred as IP packets over broadcasting channels as well as telecommunication networks. A file is segmented into data units, and file attribute information is generated for transferring. IP packets carrying these units and this information are directly multiplexed over broadcasting channels with their header compressed. We conducted experiments to verify our file-transport mechanism with a broadcasting modulator and demodulator. The results of the experiments show that files can be delivered with quite small overhead over broadcasting channels. Consequently, effective content delivery is achieved by adding the file-transport mechanism over broadcasting channels to already launched on-demand services on telecommunication networks.

Efficient scheme for transporting IP packets over the advanced satellite broadcasting system

Implementing an IP-friendly transport mechanism into broadcasting systems is anticipated to enable more convenient multimedia broadcasting applications. We developed an efficient scheme that multiplexes IP packets over broadcasting channels. This paper describes the scheme for our intended application using broadcasting channels and communication networks and shows its efficiency.