180 as the lower sublayer of the nl 150 the tal 180 is provided to carry transport capabilities via heterogeneous networks while the cal 160 is provided to adapt the transmitted data contents according to the context of mobile devices tal 180 and cal 160 can also be understood as functional units according to the presentation in fig1 three layers of a scalable video codec svc are available at the level of the cal 160 namely a first svc layer 171 a second svc layer 172 and a third svc layer 173 which can be used selectively or additively according to the information in fig1 the svc layers 171 172 173 differ from each in their image resolution their reliability reliable and their mean avg and maximum max transmission rate two transport netlets 191 192 which can be used selectively or additively and a connectivity layer 196 are available at the tal 180 level the transport netlets 191 192 differ from each other by their degree of reliability and possibly also their segmentation value the connectivity layer 196 controls a network access by establishing a connection with both the server side network card 132 and u2014 via the radio interface not shown in detail u2014 the server side wlan connection point 134 the connectivity layer 196.