average gain, and spatial receive parameters), if the antenna ports are specified as being quasi-co-located. The UE can assume that two antenna ports are quasi-co-located with respect to certain channel properties either by NR specification or explicitly informed by the network via signaling. New Radio Access Physical Layer Aspects (Part 1) 393 Table 3.14: Minimum and maximum number of resource blocks/transmission bandwidths [12]. Subcarrier min(NPRB) max(NPRB) Spacing (kHz) Minimum Bandwidth (MHz) Maximum Bandwidth (MHz) 17.28 34.56 69.12 397.44 Each element in the resource grid for antenna port p and numerology parameter u is called a resource element and is uniquely identified by pair (k, 1) where k is the index in the fre- quency domain (k is defined relative to point A such that k = 0 corresponds to the subcarrier centered around point A) and l refers to the symbol position in the time domain. A resource block is defined as NRB = 12 consecutive subcarriers in the frequency domain. Point A is a common reference point for resource block grids which is derived from the higher layer parameters [12]. As shown in Fig. 3.48, the resource blocks for each subcarrier spacing configuration are num- bered from 0 to NRB(H)NRB 1 in upward direction in the frequency domain. Table 3.14 pro- vides the minimum and maximum values of NRB(H) and their corresponding transmission bandwidths. The relationship between the CRB number NCRB in the frequency domain and resource elements (k,l for each subcarrier spacing configuration is given by NCRB = k/NRB where index k is defined relative to Point A such that k = 0 corresponds to the subcarrier cen- tered around that point A. Physical resource blocks are defined within BWPs and are numbered from 0 to The relationship between the physical resource block NPRB in the ith BWP and the CRB NCRB is given by NCRB NPRB + start -BWP(i) where NBWP(i) start is the CRB where BWP starts relative to CRB 0 as shown in Fig. 3.48. Similar to LTE, virtual resource blocks are defined within a BWP and are