A method of handling resource assignment for a network in a wireless communication system, the method comprising: configuring a plurality of component carriers in a first configuration transmitted to a mobile device for simultaneous data transmission and reception; configuring physical downlink control channel, PDCCH, signaling corresponding to a first component carrier of the plurality of component carriers on a second component carrier of the plurality of component carriers in a second configuration transmitted to the mobile device; and when configuring PDCCH signaling corresponding to a first component carrier of the plurality of component carriers on a second component carrier of the plurality of component carriers, sending the mobile device the PDCCH signaling corresponding to the first component carrier of the plurality of component carriers on the second component carrier of the plurality of component carriers; wherein sending the mobile device the PDCCH signaling corresponding to the first component carrier on the second component carrier of the plurality of component carriers comprises transmitting to the mobile device a first downlink assignment that allocates downlink resources of the first component carrier on a PDCCH of the second component carrier, and the method further comprises transmitting a second downlink assignment that allocates downlink resources of the second component carrier on the PDCCH of the second component carrier; or wherein sending the mobile device the PDCCH signaling corresponding to the first component carrier on the second component carrier of the plurality of component carriers comprises transmitting to the mobile device a first uplink grant that allocates uplink resources of the first component carrier on the PDCCH of the second component carrier, and the method further comprises transmitting a second uplink grant that allocates uplink resources of the second component carrier on the PDCCH of the second component carrier. configuring a plurality of component carriers in a first configuration transmitted to a mobile device for simultaneous data transmission and reception; configuring physical downlink control channel, PDCCH, signaling corresponding to a first component carrier of the plurality of component carriers on a second component carrier of the plurality of component carriers in a second configuration transmitted to the mobile device; and when configuring PDCCH signaling corresponding to a first component carrier of the plurality of component carriers on a second component carrier of the plurality of component carriers, sending the mobile device the PDCCH signaling corresponding to the first component carrier of the plurality of component carriers on the second component carrier of the plurality of component carriers; wherein sending the mobile device the PDCCH signaling corresponding to the first component carrier on the second component carrier of the plurality of component carriers comprises transmitting to the mobile device a first downlink assignment that allocates downlink resources of the first component carrier on a PDCCH of the second component carrier, and the method further comprises transmitting a second downlink assignment that allocates downlink resources of the second component carrier on the PDCCH of the second component carrier; or wherein sending the mobile device the PDCCH signaling corresponding to the first component carrier on the second component carrier of the plurality of component carriers comprises transmitting to the mobile device a first uplink grant that allocates uplink resources of the first component carrier on the PDCCH of the second component carrier, and the method further comprises transmitting a second uplink grant that allocates uplink resources of the second component carrier on the PDCCH of the second component carrier.