 follows nb = AnRRC/MSRS,b mod Nb for all NSRS symb OFDM symbols of the SRS resource. The value of the parameter NRRC is given by the higher layer parameter freqDomainPosition and the values of MSRS,b and Nb for b = BSRS are given in [6]. If bhop < BSRS, the frequency hopping is enabled and the frequency position indices nb are defined as nb = 4nRRC/MSRS,b mod Nb if b < bhop; otherwise, nb = {Fb(nsRs) + Nb where Nb and Fb(nsRs) are defined in [6]. The quantity NSRS counts the 604 Chapter 4 number of SRS transmissions. For the case of an SRS resource configured as aperiodic by the higher layer parameter resourceType, NSRS I//R within the slot where NSRS symb symbol SRS resource is transmitted. The quantity a repetition factor configured via higher layer signaling. For the case of an SRS resource configured as periodic or semi-persistent by the higher layer parameter resourceType, the value of the SRS counter is given by slots satisfy Notamen frame TSRS =0, where TSRS is SRS periodicity defined in the number of slots and Toffset is the slot offset [6]. Note that when supporting more than one SRS antenna port, different antenna ports share the same set of resource elements and the same baseline SRS sequence; nevertheless, different phase rotations are applied to separate them. Applying a phase rotation in the frequency domain is equivalent to cyclic shift in the time domain. As we mentioned earlier, the SRS can be configured as periodic, semi-persistent, or aperi- odic transmission A periodic SRS is transmitted with a certain configured periodicity and a certain configured slot offset within that period. A semi-persistent SRS has a configured periodicity and slot offset in the same way as a periodic SRS; however, the SRS transmis- sion is performed according to the configured periodicity and slot offset that is activated or deactivated via MAC control element signaling. An aperiodic SRS is only transmitted when explicitly triggered by means of a DCI. It should be noted that SRS activation/deactivation or triggering 