s are quasi-co-located with the SS/ PBCH block with respect to delay spread, Doppler spread, Doppler shift, average delay, and spatial RX parameters. This is a reasonable assumption as the device has been able to receive and decode the PBCH in order to access the system. The block of bits b(0), b(1), b(NPDCCH - 1), where NPDCCH denotes the number of bits transmitted on PDCCH, is scrambled prior to modulation, resulting in a block of scram- bled bits b(0), b(1), b(NPDCCH - 1) where b(i) = [b(i) + c(i) |mod 2, in which c(i) is a length-31 Gold sequence generated by the pseudo-random sequence generator defined in [6] and initialized with Cinit = (nRNTI216 nID) mod 231. For a UE-specific search space, NIDE{0,1,. 65535} is set by the RRC parameter pdcch-DMRS-ScramblingID; other- wise, N I D = Ncell and NRNTI is determined by the C-RNTI for a PDCCH in a UE-specific search space, when the RRC parameter pdcch-DMRS-ScramblingID is configured; otherwise NRNTI 0. The block of scrambled bits b(0), b(1), b(NPDCCH QPSK modulated, resulting in a block of complex-valued modulation symbols New Radio Access Physical Layer Aspects (Part 2) 451 CORESET CORESET DM-RS for PDCCH 2 DM-RS for all PDCCHs in the CORESET DM-RS for PDCCH 1 Wideband reference DM-RS per PDCCH signal Figure 4.19 Illustration of the regular and wideband reference signals for PDCCH [68]. d(0), d(1), ., d(Nsymb - 1). The block of complex-valued symbols d(0), d(1), d(Nsymb - 1) is scaled by a factor of BPDCCH and is mapped to resource elements (k,1), which are designated to PDCCH to be monitored by the UE and are not used for the associated PDCCH DM-RS, in increasing order of first k (frequency index) and l (time index) [6]. Fig. 4.20 illustrates the CORESET structures in overlapped and non- overlapped BWPs. 452 Chapter 4 NRB = = max(nRB) = max(nRB) CORESET 1 CORESET 1 CORESET CORESET 2 Overlap Overlap CORESET CORESET NRB =0 NRB=0 Figure 4.20 Illustration of the CORESET structures in overlapped and non-overlapped BWPs [71]. The PDCCH DM-RS sequence 'PDCCH(1,m) on O