A method for a User Equipment, UE, to select multiple first Constant Amplitude Zero Auto-Correlation, CAZAC, based sequences and multiple second CAZAC based sequences in a communication system wherein a Base Station, BS, communicates with UEs transmitting data signals or control signals and multiple Reference Signals, RSs, in a Physical Uplink Shared CHannel, PUSCH, over a Transmission Time Interval, TTI, with the multiple RSs represented by the respective multiple first sequences, or transmitting multiple control signals and multiple RSs in a Physical Uplink Control CHannel, PUCCH, over the TTI, with the multiple control signals or the multiple RSs represented by the respective multiple second sequences, the method comprising the steps of: receiving, by the UE, a first sequence hopping parameter indicating whether or not group sequence hopping for CAZAC based sequences is enabled and a second sequence hopping parameter indicating whether or not sequence hopping is enabled, wherein the first sequence hopping parameter is transmitted by cell-specific signaling to all UEs in a cell and the second sequence hopping parameter is transmitted by UE-specific signaling to the UE; determining, by the UE, all of the multiple first sequences to be a first sequence and all of the multiple second sequences to be a second sequence if the first sequence hopping parameter indicates that group sequence hopping is not enabled, wherein the first sequence is a demodulation reference signal, DMRS, of the PUSCH and the second sequence is a DMRS of the PUCCH; determining, by the UE, all of the multiple first sequences to be a first sequence and the multiple second sequences from a set of second sequences if the first sequence hopping parameter indicates that group sequence hopping is enabled and the second "sequence hopping" parameter indicates that sequence hopping is not enabled, wherein the first sequence is a DMRS of the PUSCH and the second sequences are DMRSs of the PUCCH; and determining, by the UE, the multiple first sequences from a set of first sequences and the multiple second sequences from a set of second sequences if the first sequence hopping parameter indicates that group sequence hopping is enabled and the second sequence hopping parameter indicates that sequence hopping is enabled, wherein the first sequences are DMRSs of the PUSCH and the second sequences are DMRSs of the PUCCH. receiving, by the UE, a first sequence hopping parameter indicating whether or not group sequence hopping for CAZAC based sequences is enabled and a second sequence hopping parameter indicating whether or not sequence hopping is enabled, wherein the first sequence hopping parameter is transmitted by cell-specific signaling to all UEs in a cell and the second sequence hopping parameter is transmitted by UE-specific signaling to the UE; determining, by the UE, all of the multiple first sequences to be a first sequence and all of the multiple second sequences to be a second sequence if the first sequence hopping parameter indicates that group sequence hopping is not enabled, wherein the first sequence is a demodulation reference signal, DMRS, of the PUSCH and the second sequence is a DMRS of the PUCCH; determining, by the UE, all of the multiple first sequences to be a first sequence and the multiple second sequences from a set of second sequences if the first sequence hopping parameter indicates that group sequence hopping is enabled and the second "sequence hopping" parameter indicates that sequence hopping is not enabled, wherein the first sequence is a DMRS of the PUSCH and the second sequences are DMRSs of the PUCCH; and determining, by the UE, the multiple first sequences from a set of first sequences and the multiple second sequences from a set of second sequences if the first sequence hopping parameter indicates that group sequence hopping is enabled and the second sequence hopping parameter indicates that sequence hopping is enabled, wherein the first sequences are DMRSs of the PUSCH and the second sequences are DMRSs of the PUCCH.