e same amount. Taken together, the adoption of these techniques ensures technical viability of a handheld television. C.3 System Issues of DVB-H and Broadband Wireless A handheld television based on the DVB-H standard can be realised in several types of systems. In the simplest mode DVB-H will be running as part of the standard DVB-T digital television terrestrial system. This solution can be readily implemented using existing transmitter infrastructure but the problem lies in the limited transmission signal strength, which may be insufficient for large area coverage and in areas with obstacles. Another issue is limited bandwidth available within the existing television programming. It is thus inevitable that the DVB-H deployment will require a separate transmitter infrastructure to be established. Such infrastructure can be overlaid with existing cellular network, enabling planning for achieving universal coverage. Integration with cellular networks provides benefits for possible service coordination, e.g. the provision of interaction channels. Mobile Broadcasting A larger task, which will come gradually in the future, is the integration of broadband wireless networks. Apart from DVB-H there are also other broadband wireless networks entering the deployment stage. A third generation UMTS system can be used for TV type services using multicast. Wireless LAN networks have significant bandwidth available for such services. It has been announced that mobile devices supporting UMTS and WLAN are soon to be available. Hence it is possible to imagine future devices supporting all three broadband wireless systems: UMTS, WLAN and DVB-H. Then the issues of coverage and access can be seen in a more general framework of network coordination, including mobile broadband handover. Here, the transmission data organisation of DVB-H can be still used in the different transport networks with mobility enhanced by handover between them. Several types of system integration are possible. DVB-H can be integrated within the existing digi