ormula: with as the Gold sequence extracted from the following two M-sequences: (x,(n+N)+x2(n+N)))mod2 x,(n+31)=(x,(n+3)+x,(n))mod2 2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+ x2(n))mod2 = At the start of each subframe, the initial value Cinit of the pseudo-random sequence is calculated from the following formula: The RIM-RS signal is periodically transmitted. The periodicity can be semi- static and determined by the gNB entity. The transmission period of the RIM-RS must be a multiple of the duration of the TDD DL/UL pattern and the same for all gNBs. The frame duration is 10 ms; the cell-specific configuration is defined by one or two profiles (pattern) transmitted to the mobile via an RRC message (see section 4.2.1). During this periodicity, several occasions of RIM-RS transmissions are configurable to distinguish the RIM-RS resources by radio network: - the physical RIM-RS signal is transmitted on each DL-UL switch; - the physical RIM-RS signal is transmitted during UL-DL switching on one of the two profiles. For each gNB radio node, several RIM-RS configurations share the same resources in the frequency domain. 120 NG-RAN and 5G-NR 4.5.3. Physical control and data channels 4.5.3.1. The physical PDCCH channel The physical PDCCH channel transmits the downlink control information (DCI) for one or more UE mobiles. DCI messages are used to: - define the allocation of resources, the modulation and coding scheme, for the data contained in the physical downlink channel (PDSCH) and in the physical uplink channel (PUSCH); - control the transmission power of the PUCCH and PUSCH. For each subframe, the PDCCH is transmitted in a grouping of time-frequency resources called CORESET. CORESET is an aggregation of the Control Channel Element (CCE). Each CCE occupies six Resource Element Groups (REG). Each REG corresponds to an RB on an OFDM symbol, a CCE comprises 72 REs, 18 of which carry the DM-RS associated with the PDCCH and 54 RE for the physical PDCCH. Each symbol is encoded by QPSK modulation. The REGs forming an CCE can be inter