Operating Manual Vol 1 - ES Documentation

Enhanced Functions For Digital Standard 3GPP W-CDMA (FDD)SMIQGeneration principle of channel-coded P-CCPCH with system frame numberWith Enhanced P-CCHCP/BCH State On, channel coding activated (Channel Coding State On) and withP-CCPCH State under Specific Enhanced Channel Settings On, the SMIQ generates a channel-codedP-CCPCH (i.e. a broadcast channel BCH) according to the following principle:Counting SFNUser selectable data (e.g. data list)SFN(11 bit)Sys Info(235 bit)BCH Transport Block 0 (20 ms). . .SFN(11 bit)Sys Info(235 bit)BCH Transport Block 2047 (20 ms)BCH Channel Coding. . .Coded BCH Transport Block 0 Coded BCH Transport Block 2047. . .P-CCPCH Frame 0 P-CCPCH Frame 1 P-CCPCH Frame 4094 P-CCPCH Frame 4095P-CCPCH Slot 0 P-CCPCH Slot 1 P-CCPCH Slot 14. . .Fig. 2-169Generation principle P-CCPCH/BCHThe data blocks of BCH at transport-channel level comprise data determined for 20 ms of the P-CCPCH(i.e. 2 frames) after channel coding. The first field of such a data block is an 11-bit long field for thesystem frame number (SFN). The SFN is automatically incremented by 1 (as stipulated in the standard)from transport block to transport block (equivalent to a step width of 2 frames due to the transport timeinterval length of 20 ms). After 2048 transport blocks (equivalent to 4096 frames) SFN is reset andstarts again at 0 (SFN restart). An output trigger indicating the SFN restart can be generated (see2.14.2.1).The SFN format is defined in [6], sections 10.2.48, 11.2 (page 578) and 11.3 (page 691). It is MSB-firstcoded.The remaining system information (a 235-bit long field per block) is filled from the data source selectedfor the P-CCPCH under Specific Enhanced Channel Settings.A data list can be used to transmit further specific system information in addition to the SFN. If only theSFN is required, ALL 0 is recommended as data source for P-CCPCH.The BCH transport blocks are then channel-coded. A coded transport block comprises the datasequence for two P-CCPCH frames.1125.5555.03 2.242 E-9