ks according to the multiframe blocks order. The parameter is broadcast on the first PBCCH block (B0). If many PCCCH channels (the total number of PCCCH channels is given by the parameter BS_PCC_CHANS broadcast on PBCCH) are present, PDTCH may be transmitted at the PBCCH blocks position in the other PCCCH channels (because PBCCH blocks are only transmitted on one single time slot in the cell). Figure 6-10 Parameters determining the mapping of the An example of the packet channels on the multiframe: packet logical channel BS_PBCCH_BLKS configuration. BS_PAG_BLKS_RES BS_PRACH_BLKS (optional) BSPBCCH BLKS=3 BS_PAG_BLKS_RES=4 TDMA Frame 0123456789 PBCCH PBCCH PBCCH PRACH PRACH PRACH PRACH PRACH Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Radio and MS-PCUSN Interfaces Chapter 6 BS_PAG_BLKS_RES (number of blocks for access grant) Indicates the number of PCCCH blocks following the PBCCH blocks (according to the multiframe blocks order) on which paging is forbidden. These blocks are thus reserved for PAGCH, and eventually PDTCH/PACCH/PTCCH. If one of these blocks is used for PAGCH, then the corresponding UL channels can be used for network access (PRACH), SO uplink state flag (USF) is annotated as being free in the MAC header of the radio block. If one of these blocks is used for PDTCH (DL), then the corresponding UL block can carry PRACH (USF is annotated as being free on the corresponding DL radio block) channels only if the mobile station was not requested to send a PACCH on this PDCH UL (for ACK, for example). BS_PRACH_BLKS (optional) Indicates the number of blocks reserved for network access (PRACH channels are reserved by blocks of four time slots even if an access burst requires only one time slot to be transmitted because all the other packet channels need four time slots to transmit their information on the RLC/MAC radio block), startin