red in order to maximize the number of available sequences, the SRS sequences are not of prime length. The SRS sequences are extended Zadoff-Chu sequences based on the longest prime-length Zadoff-Chu sequence with a length N less than or equal to the desired SRS sequence length. The sequence is then cyclically extended in the frequency domain up to the desired SRS sequence length. As the extension is performed in the frequency domain, the extended sequence has a constant spectrum and a perfect cyclic autocorrelation, but the time-domain amplitude is not constant and slightly varies. The extended Zadoff-Chu sequences are used as SRS sequences for sequence lengths of 36 or larger, corresponding to an SRS extending over 6 and 12 resource blocks in the cases of comb-2 and comb-4, respectively. For shorter sequence lengths, special flat-spectrum sequences with good time-domain envelope proper- ties are found through computer search since there would not be sufficient number of Zadoff-Chu sequences available. An SRS resource is configured by the SRS-Resource information element and consists of 1, 2, or 4 antenna ports, where the number of antenna ports is set by the higher layer parameter nrofSRS-Ports, and NSRS symb E {1,2,4} consecutive OFDM symbols provided via parameter nrofSymbols contained in the higher layer parameter resourceMapping. The starting position lo in the time domain given by lo = Nsymb - 1 - offset where the offset parameter 5} counts symbols backwards from the end of the slot and is given by the field startPosition contained in the higher layer parameter resourceMapping. The SRS sequence for an SRS resource is generated as NSRS where the length of the sequence is given by MRSmssc(a(n) sc,b is a Zadoff-Chu sequence, 8 = log2(KTC) in which KTC denotes the transmission comb number given by the higher layer parameter transmissionComb. The cyclic shift Ai for antenna port Pi is given New Radio Access Physical Layer Aspects (Part 2) 603 where Na100oa - is provided by the higher layer parameter transmissio