t, where only relevant information consists in the USF). Note that one USF is assigned for each time slot allocated, SO as many USF are present as time slots allocated (they may be equal because they concern different time slots). A TBF STARTING TIME may also be used (optional), and has the same role as for the static allocation case. Temporary Block Flow (TBF) for Dynamic Allocation Continuing with the case of dynamic allocation for UL network access, each mobile station decodes the USF transmitted on all blocks of the allocated TBF_STARTING_TIME(B) Figure 6-17 Dynamic uplink TS2/USF=1 allocation. TS3/USF=0 Packet Resource Assignment TS1/USF=3 TS2/USF=0 TBF_STARTING_TIME(A) What happens on TS 2? 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 TBF_STARTING_TIME USF=0 Figure 6-18 TBF for dynamic allocation. 345670 3456701 34567 345670 3456701 34567 USF=1 345670 3456701 3456701 34567 B13456701B13456701B13456701B13456 MS A (USF=0) B23456701B23456701B23456701B234567 MSB (USF=1) time slot DL, as shown in Figure 6-18. The focus is still on time slot 2, which has been allocated for both mobile station A and mobile station B. When a mobile station decodes its USF on one radio block DL, it is allowed to transmit on the next radio block UL. This way, the PCU enables or disables the access on the successive blocks of the same PDCH, for mobile stations that have been allocated a common PDCH. (This way, the PCU also manages the transmission on polling answer by mobile station UL, by coordinating the Relative Reserved Block Period [RRBP] field, indi- cating for a polled mobile station the block position where the answer is expected on the network side and the USF transmission on the previous DL radio block for this mobile station.) RLC/MAC Block Structure A radio block (also called an RLC/MAC block) consists of one 