A machine type communication, MTC, terminal device configured to report channel state information corresponding to a communication link between the MTC terminal device and a base station operable in a wireless communications system, receiving signals at the MTC terminal device, the signals having been transmitted from the base station via a wireless access interface, the wireless access interface providing a plurality of communications resource elements within a system bandwidth, wherein the receiving includes receiving the signals from within a virtual carrier, the virtual carrier providing a subset of the plurality of communications resource elements within a narrowband bandwidth, which forms part of and is within the system bandwidth, the terminal device comprising: a measurement unit operable to measure one or more channel state parameter corresponding to the channel state in one or more of the communications resource elements; elements of the virtual carrier; a processing unit operable to generate aggregate channel state information from at least one measured channel state parameter corresponding to the channel state of the communications resource elements of the virtual carrier, and to generate sub-band channel state information from at least one measured channel state parameter corresponding to the channel state of the communications resource elements within respective sub-band parts of the virtual carrier, each of the respective sub-band parts of the virtual carrier comprising a selection the communications resource elements of the virtual carrier, and means for signalling a change of size of the sub-band part and protocol circuitry adapted to prepare uplink signals conforming to a layer 1, L1, protocol, wherein the change of sub-band size corresponding to a change in radio propagation conditions is indicated in L1 signalling. the signals having been transmitted from the base station via a wireless access interface, the wireless access interface providing a plurality of communications resource elements within a system bandwidth, wherein the receiving includes receiving the signals from within a virtual carrier, the virtual carrier providing a subset of the plurality of communications resource elements within a narrowband bandwidth, which forms part of and is within the system bandwidth, the terminal device comprising: a measurement unit operable to measure one or more channel state parameter corresponding to the channel state in one or more of the communications resource elements; elements of the virtual carrier; a processing unit operable to generate aggregate channel state information from at least one measured channel state parameter corresponding to the channel state of the communications resource elements of the virtual carrier, and to generate sub-band channel state information from at least one measured channel state parameter corresponding to the channel state of the communications resource elements within respective sub-band parts of the virtual carrier, each of the respective sub-band parts of the virtual carrier comprising a selection the communications resource elements of the virtual carrier, and means for signalling a change of size of the sub-band part and protocol circuitry adapted to prepare uplink signals conforming to a layer 1, L1, protocol, wherein the change of sub-band size corresponding to a change in radio propagation conditions is indicated in L1 signalling. a measurement unit operable to measure one or more channel state parameter corresponding to the channel state in one or more of the communications resource elements; elements of the virtual carrier; a processing unit operable to generate aggregate channel state information from at least one measured channel state parameter corresponding to the channel state of the communications resource elements of the virtual carrier, and to generate sub-band channel state information from at least one measured channel state parameter corresponding to the channel state of the communications resource elements within respective sub-band parts of the virtual carrier, each of the respective sub-band parts of the virtual carrier comprising a selection the communications resource elements of the virtual carrier, and means for signalling a change of size of the sub-band part and protocol circuitry adapted to prepare uplink signals conforming to a layer 1, L1, protocol, wherein the change of sub-band size corresponding to a change in radio propagation conditions is indicated in L1 signalling.