For use in a wireless communications network, a method of a subscriber station communicating with at least one base station, the method comprising: receiving a downlink, DL, assignment from the at least one base station; determining a physical uplink control channel, PUCCH, resource index n PUCCH, wherein: when physical downlink control channel, PDCCH, comprising a number of control channel elements, CCEs, carries the DL assignment, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n CCE + N; wherein n CCE is the smallest CCE index of the number of CCEs, N = N PUCCH 1 is cell-specifically higher-layer configured; when enhanced physical downlink control channel, ePDCCH, comprising a number of enhanced control channel elements, eCCEs, carries the DL assignment: when the ePDCCH is localized, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y + Δ; and when the ePDCCH is distributed, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y; wherein n eCCE is the smallest eCCE index of the number of eCCEs, N ′ = N PUCCH-UE-ePDCCH 1 is subscriber station-specifically higher-layer configured, Δ is a function of radio network temporary identifier, RNTI, and Y is determined by a 2-bit field in the DL assignment; and transmitting hybrid automatic repeat request-acknowledgement, HARQ-ACK, information for a physical uplink shared channel, PDSCH, scheduled by the DL assignment to the at least one base station on PUCCH resource n PUCCH. receiving a downlink, DL, assignment from the at least one base station; determining a physical uplink control channel, PUCCH, resource index n PUCCH, wherein: when physical downlink control channel, PDCCH, comprising a number of control channel elements, CCEs, carries the DL assignment, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n CCE + N; wherein n CCE is the smallest CCE index of the number of CCEs, N = N PUCCH 1 is cell-specifically higher-layer configured; when enhanced physical downlink control channel, ePDCCH, comprising a number of enhanced control channel elements, eCCEs, carries the DL assignment: when the ePDCCH is localized, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y + Δ; and when the ePDCCH is distributed, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y; wherein n eCCE is the smallest eCCE index of the number of eCCEs, N ′ = N PUCCH-UE-ePDCCH 1 is subscriber station-specifically higher-layer configured, Δ is a function of radio network temporary identifier, RNTI, and Y is determined by a 2-bit field in the DL assignment; and when physical downlink control channel, PDCCH, comprising a number of control channel elements, CCEs, carries the DL assignment, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n CCE + N; wherein n CCE is the smallest CCE index of the number of CCEs, N = N PUCCH 1 is cell-specifically higher-layer configured; when enhanced physical downlink control channel, ePDCCH, comprising a number of enhanced control channel elements, eCCEs, carries the DL assignment: when the ePDCCH is localized, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y + Δ; and when the ePDCCH is distributed, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y; wherein n eCCE is the smallest eCCE index of the number of eCCEs, N ′ = N PUCCH-UE-ePDCCH 1 is subscriber station-specifically higher-layer configured, Δ is a function of radio network temporary identifier, RNTI, and Y is determined by a 2-bit field in the DL assignment; and when the ePDCCH is localized, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y + Δ; and when the ePDCCH is distributed, the subscriber station derives the PUCCH resource index n PUCCH according to the equation: n PUCCH = n eCCE + N ′ + Y; wherein n eCCE is the smallest eCCE index of the number of eCCEs, N ′ = N PUCCH-UE-ePDCCH 1 is subscriber station-specifically higher-layer configured, Δ is a function of radio network temporary identifier, RNTI, and Y is determined by a 2-bit field in the DL assignment; and transmitting hybrid automatic repeat request-acknowledgement, HARQ-ACK, information for a physical uplink shared channel, PDSCH, scheduled by the DL assignment to the at least one base station on PUCCH resource n PUCCH.