INTEGRATED CIRCUIT

摘要

A CCE+ number allocation method reduces the ACK/NACK (Acknowledgment/Negative Acknowledgment) collision probability in a mixed system containing an LTE (Long Term Evolution) system and an LTE+ (Long Term Evolution Advanced) system. A CCE (Control Channel Element)+ number is defined by selecting a number from CCE numbers of the CCE to contain PDCCH (Physical Downlink Control Channel) allocated in a resource element region constituting CCE+ where PDCCH+ is arranged. This can prevent overlapped selection of the CCE number and the CCE+ number even when the PDCCH and the PDCCH+ are simultaneously transmitted, thus making it possible to reduce the collision probability of ACK/NACK correlated to the CCE number and the CCE+ number.

主权项

1. An integrated circuit to control a process, the process comprising:
mapping a first downlink control information in a first communication system to at least one of control channel elements+ (CCEs+), each of the CCEs+ being comprised of resource elements, and the CCEs+ being numbered respectively by the 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, the L being one of aggregation sizes of CCEs, which is used for the second downlink control information.