PRACH slots within a subframe or num- ber of PRACH slots within a 60 kHz slot is equal to 1, then = 1; otherwise, 0,1 The quantities LRA and Nu are the length of the PRACH sequence and the number of sam- ples in a PRACH symbol, and + 16kn wherein n = 0 for Afra E {1.25,5} kHz. For AfRAE{15,30,60,120}kHz, n is the number of times the interval overlaps with either time instance zero or time instance (AfmaxN//2000)T, =0.5 ms in a subframe [6]. The parameters ZeroCorrelationZoneConfig and prach-RootSequenceIndex (defined in [6]) are used to generate the random-access signatures for each cell, which are required to be distinct across neighboring cells. There is a relationship between the preamble format and the cell radius, which means that the selection of ZeroCorrelationZoneConfig parameter is related to the cell radius. The parameters ZeroCorrelationZoneConfig and prach-RootSequenceIndex are derived from SystemInformationBlockTypel. The random- access sequences are generated via selection of a Zadoff-Chu sequence (1 out of 839 or 139) given by prach-RootSequenceIndex and a cyclic shift that is used 64 times to generate the 64 random-access signatures from the Zadoff-Chu sequence selected. The cyclic shift is indirectly provided to the UE via the parameter ZeroCorrelationZoneConfig. The cyclic shift is also related to the cell size. The relationship between the cyclic shift and the cell size is given by (Ncs - 1) (800 us/839) > RTD + TDelay_Spread. If Afra = 1.25 kHz, the PRACH symbol duration is 0.8 ms (0.133 ms in case of 139). The round-trip delay can be written as RTD = 2Rcell/c; therefore Rcell VI c[(Ncs 1)(800 us/839) - T Delay_Spread]/2 As an example, if we assume that ZeroCorrelationZoneConfig is 12 then from [6] and assum- ing Afra = 1.25 kHz, NCS = 119. Furthermore, if TDelay_Spread = 6 us then the cell size will be approximately 15.97 km. Note that the smaller the cyclic shift, the smaller cell size. The delay spread in the preceding expression is derived empirically and the value of the delay spread is t