HARQ TDD FDD CARRIER AGGREGATION OF TDD AND FDD SUBFRAMES FOR UPLINK HARQ FEEDBACK

摘要

Allocating UL channel resources by determining a first HARQ timing and a second HARQ timing for the FDD carrier 300 to enable HARQ feedback on a physical UL shared channel in a communication system 100 based on TDD and FDD carrier aggregation (700) in a first communication device (110). The method 700 includes determining 701 the first DL HARQ timing and determining whether the association is based on a UL control channel for an associated set of DL subframes 310 in the FDD carrier 300, (230) in the TDD carrier (200) defined to transmit HARQ feedback on the UL subframe (230); Determining (702) the second DL HARQ timing; determining which UL sub-frame is to be transmitted to transmit HARQ feedback on a UL Shared Channel for an association set of DL sub-frames (310) in the FDD carrier (300) (360), resulting in a first set of UL sub-frames in which the physical UL shared channel can contain HARQ feedback, and a second set of UL sub-frames that do not include HARQ feedback; And, if there is no UL control channel allocated according to the first DL HARQ timing, allocating UL channel resources for the HARQ feedback on the physical UL shared channel in the first set of UL subframes according to the second DL HARQ timing (Step 703).