Patent ID: 8717989

Claim:
A method for transmitting a control information on a control channel element (CCE), the method comprising: mapping a first downlink control information in a first communication system to at least one of CCEs+, wherein each of the CCEs+ is comprised of resource elements and the CCEs+ are numbered respectively by CCE+ numbers that are assigned thereto; and transmitting the first downlink control information on said at least one of the CCEs+ that are numbered by the CCE+ numbers, wherein the CCE+ numbers are respectively assigned to the CCEs+ such that each of the CCEs+ has a CCE+ number same as a CCE number that is assigned to a CCE, that is used for a second downlink control information in a second communication system and that is comprised of the resource elements, of which said each of the CCEs+ is comprised, and a beginning position of at least one of the CCEs+ is matched with a position obtained by multiplying an L number of CCE(s) by an integer, wherein the L is one of aggregation sizes of CCEs, which is used for the second downlink control information.