possible partitioning of the radio frame as shown below 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 dl dl dl dl dl dl dl dl ul ul ul ul ul ul ul utra specifies the processing that is applied to the transport channel trch data by layer 1 l 1 as shown in fig2 transport blocks blocks of a defined number of bits are submitted by the media access control mac to l 1 for processing a transport block typically corresponds to a mac protocol data unit pdu or corresponding unit layer 1 processes each transport block as shown in fig2 to build up cctrchs firstly cyclic redundancy check crc attachment is performed at 205 then transport block trbk concatenation code block segmentation is performed at 210 next channel coding is performed at 215 then radio frame equalisation is performed at 220 next first interleaving is performed at 225 then radio frame segmentation is performed at 230 and rate matching is performed at 235 a number of rate matched data streams are multiplexed together on a single transport channel at 240 then the resultant multiplexed data stream is processed by bit scrambling at 245 the bit scrambled data stream is segmented into a number of physical channels at 250 then second interleaving is performed on each of the segmented physical channel data streams at 255 finally physical channel.