A method for communication in a wireless telecommunication system, the method comprising: determining , by a network element , that a physical uplink shared channel, PUSCH, transmission scheduled on a subframe of a secondary cell, SCell, requires an acknowledgement/negative acknowledgement, ACK/NACK, on a downlink subframe of a primary cell, PCell, associated with the network element; and provisioning , by the network element, for a carrier aggregation-capable user equipment, UE , in a control region of the downlink subframe of the PCell, at least one resource for a physical hybrid automatic repeat request, HARQ, indicator channel, PHICH, wherein the downlink subframe of the PCell is not configured for a PHICH resource in an uplink/downlink configuration for operations using only the PCell, wherein provisioning the at least one PHICH resource includes: determining, by the network element, a reference uplink/downlink configuration which the SCell PUSCH HARQ ACK/NACK timing follows, the reference uplink/downlink configuration is determined based on uplink/downlink configurations of the PCell and SCell; based on the reference uplink/downlink configuration, identifying, by the network element, the downlink subframe to provision the at least one PHICH resource and a PHICH resource factor for the downlink subframe; and provisioning the at least one PHICH resource based on the identified PHICH resource factor in the control region of the downlink subframe of the PCell. determining , by a network element , that a physical uplink shared channel, PUSCH, transmission scheduled on a subframe of a secondary cell, SCell, requires an acknowledgement/negative acknowledgement, ACK/NACK, on a downlink subframe of a primary cell, PCell, associated with the network element; and provisioning , by the network element, for a carrier aggregation-capable user equipment, UE , in a control region of the downlink subframe of the PCell, at least one resource for a physical hybrid automatic repeat request, HARQ, indicator channel, PHICH, wherein the downlink subframe of the PCell is not configured for a PHICH resource in an uplink/downlink configuration for operations using only the PCell, wherein provisioning the at least one PHICH resource includes: determining, by the network element, a reference uplink/downlink configuration which the SCell PUSCH HARQ ACK/NACK timing follows, the reference uplink/downlink configuration is determined based on uplink/downlink configurations of the PCell and SCell; based on the reference uplink/downlink configuration, identifying, by the network element, the downlink subframe to provision the at least one PHICH resource and a PHICH resource factor for the downlink subframe; and provisioning the at least one PHICH resource based on the identified PHICH resource factor in the control region of the downlink subframe of the PCell. determining, by the network element, a reference uplink/downlink configuration which the SCell PUSCH HARQ ACK/NACK timing follows, the reference uplink/downlink configuration is determined based on uplink/downlink configurations of the PCell and SCell; based on the reference uplink/downlink configuration, identifying, by the network element, the downlink subframe to provision the at least one PHICH resource and a PHICH resource factor for the downlink subframe; and provisioning the at least one PHICH resource based on the identified PHICH resource factor in the control region of the downlink subframe of the PCell. <EOS>