“…However, classical DVB technologies such as DVB-Terrestrial (DVB-T), DVB-Satellite (DVB-S), or High Definition TV (HDTV) (DVB, 2005;Benson and Fink, 1991), do not allow for efficient delivery of services to users on the move and in general are not capable of providing advanced interactive services to such users due to the power consumption characteristics of the terminals and the difficulty of integrating a return channel (Centonza et al, 2006;Cosmas et al, 2004). Indeed, the only successful type of interactive service deployment achieved in the past via DVB technologies was performed on in-car terminals with very high power consumption and therefore limited portability (Heidkamp et al, 2004;Tönjes et al, 2002). Moreover, the fact that classical DVB services are designed to be delivered on dedicated networks using MPEG2 transport stream format (DVB, 2005) constitutes an obstacle to the "all-IP" merging of existing and future technologies in a real convergent framework.…”