he PDSCH if the PDSCH was transmitted with the midamble assigned to the UE by UTRAN. 4.4.8 The Page Indicator Channel (PICH) The Page Indicator Channel ¹³ (PICH) carries the Page Indicators (PI), which indicate a paging message for one or more UEs associated with it, and is always transmitted at the same reference power level as the P-CCPCH. The PICH substitutes one or more paging sub-channels mapped on a S-CCPCH. Figure 4.45 illustrates normal bursts that carry PIs of length LpI = 2, LpI = 4 or LpI = 8 symbols, and Table 4.35 illustrates the number of page indicators NPI per time slot given by the number Lpr symbols for the page indicators and the burst type. Table 4.35 Number NPI of PI per Time Slot for the Different Burst Types and PI Lengths LpI Lpr = 2 Lpr = 4 Lpr = 8 Burst type 1 Burst type 2 The same burst type is used for the PICH in every cell. As illustrated in Figure 4.45 when LpI = 4 or LpI = 8, we leave behind one symbol in each data part adjacent to the midamble and fill it by dummy bits transmitted with the same power as the PI [6]. 2560T Midamble (256 Chips) PI 34 2 unused PI 34 symbols Figure 4.45 Example of PI transmission in PICH bursts (LpI = 4). 13 Physical channel. The UMTS Network and Radio Access Technology 4.4.9 Beacon Function in Physical Channels Depending on its allocation case, the SCH determines the location of the physical chan- nels with beacon function for the purpose of measurements. In Case 1, all physical channels with channelization code COKEIN and in TS#k, k = 0,...,14 allocation provide the beacon function. In Case 2 all physical channels with channelization code COKE and TS#k and TS#k + 8, k = 0, ...,6, allocation also provide the beacon function. Thereby, the P-CCPCH always provides the beacon function. The physical channels providing the beacon function transmit with reference power and without beam-forming, use type 1 burst employing midamble m(1) and m² exclusively, while midambles m(9) and m (10) remain unused in this time slot when the cell allows 16 midambles. The re