A method performed by a user device, comprising: receiving, at the user device, from a base station, initial acknowledgement resource information comprising information for determining a subset of acknowledgement resources in a cell to be used by said user device prior to said user device receiving dedicated acknowledgement resource information; determining, by said user device, in dependence on said initial acknowledgement resource information, said subset of acknowledgement resources in the cell to be used by said user device prior to said user device receiving said dedicated acknowledgement resource information; receiving, at said user device, a message including a common ACK/NACK resource indicator value; determining, by said user device, an acknowledgement resource associated with said common ACK/NACK resource indicator value received in said message from said subset of acknowledgement resources in the cell; and causing transmission, by said user device, of an acknowledgement on said acknowledgement resource determined to be associated with said common ACK/NACK resource indicator value received in said message, wherein said transmission of said acknowledgement occurs prior to said user device receiving said dedicated acknowledgement resource information, wherein said initial acknowledgement resource information comprises common physical uplink control channel configuration information that is received at said user equipment during initial access when a radio resource control connection has not yet been established, and wherein said common physical uplink control channel configuration information comprises at least one supported physical uplink control channel format. receiving, at the user device, from a base station, initial acknowledgement resource information comprising information for determining a subset of acknowledgement resources in a cell to be used by said user device prior to said user device receiving dedicated acknowledgement resource information; determining, by said user device, in dependence on said initial acknowledgement resource information, said subset of acknowledgement resources in the cell to be used by said user device prior to said user device receiving said dedicated acknowledgement resource information; receiving, at said user device, a message including a common ACK/NACK resource indicator value; determining, by said user device, an acknowledgement resource associated with said common ACK/NACK resource indicator value received in said message from said subset of acknowledgement resources in the cell; and causing transmission, by said user device, of an acknowledgement on said acknowledgement resource determined to be associated with said common ACK/NACK resource indicator value received in said message, wherein said transmission of said acknowledgement occurs prior to said user device receiving said dedicated acknowledgement resource information, wherein said initial acknowledgement resource information comprises common physical uplink control channel configuration information that is received at said user equipment during initial access when a radio resource control connection has not yet been established, and wherein said common physical uplink control channel configuration information comprises at least one supported physical uplink control channel format.