A wireless transmit/receive unit, WTRU, for wireless communication using non-orthogonal control channel elements, CCEs, a memory; and a processor configured to: determine a plurality of physical downlink control channel, PDCCH, candidates; determine a mapping between the plurality of PDCCH candidates and a plurality of control channel elements, CCEs, of said CCEs, and a mapping between the plurality of CCEs and a plurality of resource element groups, REGs, wherein there is an overlap of at least two CCEs of the plurality of CCEs, and wherein the overlap of the at least two CCEs comprises a resource element, RE, being assigned to a position that is common to the at least two CCEs; blind-detect a PDCCH transmission associated with the WTRU, wherein the blind detection uses interference cancellation, and wherein the interference cancellation uses the determined mappings to mitigate interference from an active overlapping CCE associated with a PDCCH transmission associated with a different WTRU; decode an active CCE associated with the PDCCH transmission associated with the WTRU for control information of the WTRU; and transmit a signal based on the control information. a memory; and a processor configured to: determine a plurality of physical downlink control channel, PDCCH, candidates; determine a mapping between the plurality of PDCCH candidates and a plurality of control channel elements, CCEs, of said CCEs, and a mapping between the plurality of CCEs and a plurality of resource element groups, REGs, wherein there is an overlap of at least two CCEs of the plurality of CCEs, and wherein the overlap of the at least two CCEs comprises a resource element, RE, being assigned to a position that is common to the at least two CCEs; blind-detect a PDCCH transmission associated with the WTRU, wherein the blind detection uses interference cancellation, and wherein the interference cancellation uses the determined mappings to mitigate interference from an active overlapping CCE associated with a PDCCH transmission associated with a different WTRU; decode an active CCE associated with the PDCCH transmission associated with the WTRU for control information of the WTRU; and transmit a signal based on the control information. determine a plurality of physical downlink control channel, PDCCH, candidates; determine a mapping between the plurality of PDCCH candidates and a plurality of control channel elements, CCEs, of said CCEs, and a mapping between the plurality of CCEs and a plurality of resource element groups, REGs, wherein there is an overlap of at least two CCEs of the plurality of CCEs, and wherein the overlap of the at least two CCEs comprises a resource element, RE, being assigned to a position that is common to the at least two CCEs; blind-detect a PDCCH transmission associated with the WTRU, wherein the blind detection uses interference cancellation, and wherein the interference cancellation uses the determined mappings to mitigate interference from an active overlapping CCE associated with a PDCCH transmission associated with a different WTRU; decode an active CCE associated with the PDCCH transmission associated with the WTRU for control information of the WTRU; and transmit a signal based on the control information.