A method of signaling control information in an uplink subframe in a wireless multi-carrier communication system, comprising: determining, at a user equipment, acknowledgment/negative acknowledgment, ACK/NACK feedback associated with downlink data for a plurality of component carriers; identifying one or more scheduling request, SR resources available to the user equipment upon a determination that a positive SR is present; bundling the ACK/NACK feedback; and transmitting the bundled ACK/NACK feedback for the plurality of component carriers using the one or more selected SR resources, wherein the manner in which the ACK/NACK feedback is provided is based on whether the user equipment is operating in a frequency division duplex, FDD or time division duplex, TDD mode of operation, wherein, if the user equipment is in FDD mode of operation, in which the plurality of component carriers comprise first and second FDD carriers, said bundling the ACK/NACK feedback comprises: determining an ACK/NACK feedback value for each of the first and second component carriers by performing spatial bundling on the ACK/ NACKs for each FDD carrier; and mapping the ACK/NACK feedback for the first component carrier to a first bit value associated with the one or more SR resources and mapping the ACK/NACK feedback for the second component carrier to a second bit value associated with the one or more SR resources; and wherein, if the user equipment is in TDD mode of operation, in which the plurality of component carriers comprise a first and a second TDD carrier, said bundling the ACK/NACK feedback comprises: determining a number of ACK instances on the first and second component carriers; and mapping the number of ACK instances to first and second bit values associated with the one or more SR resources. determining, at a user equipment, acknowledgment/negative acknowledgment, ACK/NACK feedback associated with downlink data for a plurality of component carriers; identifying one or more scheduling request, SR resources available to the user equipment upon a determination that a positive SR is present; bundling the ACK/NACK feedback; and transmitting the bundled ACK/NACK feedback for the plurality of component carriers using the one or more selected SR resources, wherein the manner in which the ACK/NACK feedback is provided is based on whether the user equipment is operating in a frequency division duplex, FDD or time division duplex, TDD mode of operation, wherein, if the user equipment is in FDD mode of operation, in which the plurality of component carriers comprise first and second FDD carriers, said bundling the ACK/NACK feedback comprises: determining an ACK/NACK feedback value for each of the first and second component carriers by performing spatial bundling on the ACK/ NACKs for each FDD carrier; and mapping the ACK/NACK feedback for the first component carrier to a first bit value associated with the one or more SR resources and mapping the ACK/NACK feedback for the second component carrier to a second bit value associated with the one or more SR resources; and wherein, if the user equipment is in TDD mode of operation, in which the plurality of component carriers comprise a first and a second TDD carrier, said bundling the ACK/NACK feedback comprises: determining a number of ACK instances on the first and second component carriers; and mapping the number of ACK instances to first and second bit values associated with the one or more SR resources. determining an ACK/NACK feedback value for each of the first and second component carriers by performing spatial bundling on the ACK/ NACKs for each FDD carrier; and mapping the ACK/NACK feedback for the first component carrier to a first bit value associated with the one or more SR resources and mapping the ACK/NACK feedback for the second component carrier to a second bit value associated with the one or more SR resources; and wherein, if the user equipment is in TDD mode of operation, in which the plurality of component carriers comprise a first and a second TDD carrier, said bundling the ACK/NACK feedback comprises: determining a number of ACK instances on the first and second component carriers; and mapping the number of ACK instances to first and second bit values associated with the one or more SR resources. determining a number of ACK instances on the first and second component carriers; and mapping the number of ACK instances to first and second bit values associated with the one or more SR resources.