A timing entity of a user equipment of a communication network including a base station (102, 202) and the user equipment (104, 204), wherein the base station and user equipment are capable of communicating with each other over at least two carriers (130, 132), the at least two carriers (130, 132) including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier (112, 130) and the second carrier (114, 132) having different temporal configuration of its uplink and downlink resources and wherein the first carrier first carrier is for data transmissions and the second carrier is for control signalling transmissions, the timing entity comprising: a control entity adapted for determining timing data defining a timing of a control signalling transmission, the control signalling transmission being related to a data transmission performed on the first carrier; the control signalling transmission using a resource of a first type on the second carrier, wherein the resource of the first type is either an uplink resource or a downlink resource; and the timing data specifying for the control signalling transmission a time slot in which there is available a resource of the first type on the second carrier for the control signalling transmission, characterized in that, the control entity is adapted to determine the timing data based on configuration indicating data, wherein the timing data defines timing of the control signalling transmission on the second carrier and wherein the configuration indicating data is indicative of the temporal configuration of the uplink and downlink resources of the first carrier and is also indicative of the temporal configuration of the uplink and downlink resources on the second carrier; and wherein the user equipment further comprises a controller having: a first control unit adapted to receive the timing data from the control entity and to adjust, depending on these timing data, a timing of a control signalling transmission; and a second control unit adapted to receive the configuration indicating data, whereby the user equipment is arranged to use the temporal configuration of the uplink and downlink resources of the first and second carriers, to determine by itself the timing of the control signalling transmission. a control entity adapted for determining timing data defining a timing of a control signalling transmission, the control signalling transmission being related to a data transmission performed on the first carrier; the control signalling transmission using a resource of a first type on the second carrier, wherein the resource of the first type is either an uplink resource or a downlink resource; and the timing data specifying for the control signalling transmission a time slot in which there is available a resource of the first type on the second carrier for the control signalling transmission, characterized in that, the control entity is adapted to determine the timing data based on configuration indicating data, wherein the timing data defines timing of the control signalling transmission on the second carrier and wherein the configuration indicating data is indicative of the temporal configuration of the uplink and downlink resources of the first carrier and is also indicative of the temporal configuration of the uplink and downlink resources on the second carrier; and wherein the user equipment further comprises a controller having: a first control unit adapted to receive the timing data from the control entity and to adjust, depending on these timing data, a timing of a control signalling transmission; and a second control unit adapted to receive the configuration indicating data, whereby the user equipment is arranged to use the temporal configuration of the uplink and downlink resources of the first and second carriers, to determine by itself the timing of the control signalling transmission. a first control unit adapted to receive the timing data from the control entity and to adjust, depending on these timing data, a timing of a control signalling transmission; and a second control unit adapted to receive the configuration indicating data, whereby the user equipment is arranged to use the temporal configuration of the uplink and downlink resources of the first and second carriers, to determine by itself the timing of the control signalling transmission.