al content tailored to handheld TV channels which might be composed of cartoons or music videos. Special attention should be made to the potential of using instant interactivity built into mobile devices. Game content and special entertainment comes to mind in this respect. It is evident, however, that applications and services for DVB-H require further studies. C.5 Mobile Broadcasting Today mobile streaming is a unicasting service not suitable for heavy mass communications to many receivers (broadcasting). Two promising technologies exist: DVB-H (digital video broadcasting, handheld). Specified by ETSI as an extension to DVB-T, DVB-H is based on a single-frequency network, bandwidth from 5 up to 12 Mbps depending on the modulation and protection schemes (code rates) on subcarriers and needs return channel, e.g. GPRS for interaction. MBMS (multimedia broadcast/multicast service). Specified in 3GPP release 6 (January 2005), the MBMS uses the existing EDGE/UMTS infrastructure at 64-384 kbps. Digital Video Broadcasting Table C.1 Technology overview Technology Weakness Not scalable for mass content delivery DVB-T Designed for rooftop reception Need for an efficient power-saving mechanism Inadequate impulse noise protection and mobility Designed for devices with power constraints but too narrow a spectrum assigned for data transmission C.5.1 DVB-H Technology Overview To focus on significant contributions in the development of DVB-H systems and applications a substantial investment in the related research infrastructure has recently been made. The first commercially available DVB-H system in the world was ordered and installed before the end of 2004. The system is composed of a commercial DVB-H/DVB-T transmitter with output power of 50 W and a DVB-H playout system, which produces valid DVB-H streams including those for multiprogramme broadcast. Test receivers will also be available. The DVB-H test system will enable technical trials and investigation of system properties in practical conditions. It will also make it po