A method for allocating frequency resources in a wideband system, performed by a user equipment, wherein the wideband system comprises a bandwidth part, BWP, containing a plurality of subbands ( N; SB0, SB1), each subband, SB, being formed by resource blocks, RB, the method comprises the steps of: - obtaining an interlace structure determined by: ∘ a set of always-valid RB, AV-RB, determined in each subband by starting from a starting AV-RB and containing a number of consecutive RB corresponding to a pre-defined number of RB forming an interlace; o a set of potential-valid RB, PV-RB, as all RB other than the AV-RB; - obtaining at least one interlace index (#i) and at least one SB index (SBj); characterized in that the method further comprises the steps of: - determining the frequency resources based on the at least one interlace index, the at least one SB index and the interlace structure, such that: o if the at least one subband index corresponds to a single SB, the allocated frequency resources are overlapping RBs between RBs of the at least one indicated interlace index and the AV-RB s of the single subband; o if the at least one subband index corresponds to two or more SB, the allocated frequency resources are determined by: ▪ for any two contiguous SB ( m, m + 1) among the two or more SB, converting into AV-RB any PV-RB located between the last AV-RB of the first contiguous SB ( m) and the first AV-RB of the second contiguous SB ( m + 1); ▪ determining the allocated frequency resources as overlapping RBs between RBs of the at least one indicated interlace index and the AV-RBs of the two or more SB. - obtaining an interlace structure determined by: ∘ a set of always-valid RB, AV-RB, determined in each subband by starting from a starting AV-RB and containing a number of consecutive RB corresponding to a pre-defined number of RB forming an interlace; o a set of potential-valid RB, PV-RB, as all RB other than the AV-RB; ∘ a set of always-valid RB, AV-RB, determined in each subband by starting from a starting AV-RB and containing a number of consecutive RB corresponding to a pre-defined number of RB forming an interlace; o a set of potential-valid RB, PV-RB, as all RB other than the AV-RB; - obtaining at least one interlace index (#i) and at least one SB index (SBj); - determining the frequency resources based on the at least one interlace index, the at least one SB index and the interlace structure, such that: o if the at least one subband index corresponds to a single SB, the allocated frequency resources are overlapping RBs between RBs of the at least one indicated interlace index and the AV-RB s of the single subband; o if the at least one subband index corresponds to two or more SB, the allocated frequency resources are determined by: ▪ for any two contiguous SB ( m, m + 1) among the two or more SB, converting into AV-RB any PV-RB located between the last AV-RB of the first contiguous SB ( m) and the first AV-RB of the second contiguous SB ( m + 1); ▪ determining the allocated frequency resources as overlapping RBs between RBs of the at least one indicated interlace index and the AV-RBs of the two or more SB. o if the at least one subband index corresponds to a single SB, the allocated frequency resources are overlapping RBs between RBs of the at least one indicated interlace index and the AV-RB s of the single subband; o if the at least one subband index corresponds to two or more SB, the allocated frequency resources are determined by: ▪ for any two contiguous SB ( m, m + 1) among the two or more SB, converting into AV-RB any PV-RB located between the last AV-RB of the first contiguous SB ( m) and the first AV-RB of the second contiguous SB ( m + 1); ▪ determining the allocated frequency resources as overlapping RBs between RBs of the at least one indicated interlace index and the AV-RBs of the two or more SB. ▪ for any two contiguous SB ( m, m + 1) among the two or more SB, converting into AV-RB any PV-RB located between the last AV-RB of the first contiguous SB ( m) and the first AV-RB of the second contiguous SB ( m + 1); ▪ determining the allocated frequency resources as overlapping RBs between RBs of the at least one indicated interlace index and the AV-RBs of the two or more SB.