A method for a radio network node, for assignment of uplink control channel resources for providing HARQ feedback for data transmitted on a downlink data channel associated with a downlink control channel, comprising at least a set of downlink control channel resources, the set of downlink control channel resources being configurable over a subset of available time frequency resources, the method comprising: dividing a set of indices of the downlink control channel resources into at least two subsets {Φ 0,Φ 1,Φ 2,Φ 3} of indices to the respective downlink control channel resources, defining for each such subset {Φ 0,Φ 1,Φ 2,Φ 3} of indices of the downlink control channel resources, an associated subset {Ω 0,Ω 1,Ω 2,Ω 3} of indices to unique uplink control channel resources, associating each element in the subset {Ω 0,Ω 1,Ω 2,Ω 3} of indices of the uplink control channel resources with a subframe and an element in the subset {Φ 0,Φ 1,Φ 2,Φ 3} of indices of the downlink control channel resources for assignment of uplink control channel resources for providing HARQ feedback for data transmitted on the downlink data channel associated with the downlink control channel; wherein the downlink control channel comprises a resource indicator, wherein at least one value of said resource indicator is used for indicating the association of each element in each set {Ω 0,Ω 1,Ω 2,Ω 3} of unique uplink channel resources with a subframe and one element in the set of downlink control channel resources; characterized in that the method comprising using resource indicator values which are dependent on the subframe index number j or on the subframe index number j and the number of downlink subframes, M, associated with the given uplink subframe; and wherein at least one resource indicator value r(j) is r j = − Σ j − 1 N k for at least one j, wherein j is the subframe index number of the downlink control channel comprising the resource indicator, N k is the number of uplink control channel resources in subframe k. dividing a set of indices of the downlink control channel resources into at least two subsets {Φ 0,Φ 1,Φ 2,Φ 3} of indices to the respective downlink control channel resources, defining for each such subset {Φ 0,Φ 1,Φ 2,Φ 3} of indices of the downlink control channel resources, an associated subset {Ω 0,Ω 1,Ω 2,Ω 3} of indices to unique uplink control channel resources, associating each element in the subset {Ω 0,Ω 1,Ω 2,Ω 3} of indices of the uplink control channel resources with a subframe and an element in the subset {Φ 0,Φ 1,Φ 2,Φ 3} of indices of the downlink control channel resources for assignment of uplink control channel resources for providing HARQ feedback for data transmitted on the downlink data channel associated with the downlink control channel; wherein the downlink control channel comprises a resource indicator, wherein at least one value of said resource indicator is used for indicating the association of each element in each set {Ω 0,Ω 1,Ω 2,Ω 3} of unique uplink channel resources with a subframe and one element in the set of downlink control channel resources; characterized in that the method comprising using resource indicator values which are dependent on the subframe index number j or on the subframe index number j and the number of downlink subframes, M, associated with the given uplink subframe; and wherein at least one resource indicator value r(j) is r j = − Σ j − 1 N k for at least one j, wherein j is the subframe index number of the downlink control channel comprising the resource indicator, N k is the number of uplink control channel resources in subframe k.