ts some difficulties as the low priority (LP) and high priority (HP) channels might come from different programmes providers and via different networks. Data are read from each of the megaframe information pockets (MIPs) (LP and HP). The modulation parameters such as the guard interval, modulation parameters and time to transmit are read from the HP MIP. Only code rates are read from both the LP and HP channels. DVB-H 4k Mode and In-Depth Interleavers Some features are: interpolated solution between the 2k and 8k modes; directly scaled parameters; dedicated 4k mode symbol interleaver; continual pilots from the same arrangement (8k); easy implementation; only some control logic needed; 8k interleaver can be used with 4k or 2k DVB-T physical level native interleaver and works within one OFDM symbol; when 8k interleaver is used with 4k, interleaving happens over two symbols; when 8k interleaver is used with 2k, interleaving happens over four symbols. A native inner interleaver for the '4k' mode as well as the option to use the 8k inner interleaver on the encoded bit flows produced for the 2k and 4k modes are specified in Figure C.2. Digital Video Broadcasting 8K mode 4K mode 2K mode Native 4K Native 2K inner interleaver inner interleaver 12 X 126 bits 24 X 126 bits Native 8K inner interleaver 48 X 126 bits In-depth 4K In-depth 2K inner interleaver inner interleaver 12 X 126 bits 24 X 126 bits 12 X 126 bits 12 X 126 bits 24 X 126 bits 12 X 126 bits Figure C.2 Native inner interleavers C.6.4 DVB-H Innovative Elements Time Slicing Time slicing (Figure C.3) is adopted in order to achieve battery saving in handsets for mobile reception applications. It is applied on top of DVB-H modulation, using the time division multiplexing (TDM) technique. Therefore, a video stream is sent in bursts on the transmission side and the DVB-H receiver, which has a buffer, is switched on only during the bursts related to the selected content; this allows approximately 90 % battery power savings and the terminal reads data from its buffer, 