CARRIER AGGREGATION OF TDD AND FDD SUBFRAMES FOR UPLINK HARQ FEEDBACK

摘要

Method (700) in a first communication device (110), for assignment of UL channel resources by determining a first HARQ timing for a FDD carrier (300) and a second HARQ timing, for enabling HARQ feedback on a physical UL shared channel in a communication system (100) based on TDD and FDD carrier aggregation. The method (700) comprises determining (701) said first timing wherein an association determines which UL subframes (230) in the TDD carrier (200) that are defined for transmitting HARQ on an UL control channel for an associated set of DL subframes (310) in the FDD carrier (300), and determining (702) said second timing, wherein an association determines which UL subframes (360) that are defined for transmitting HARQ on an UL shared channel for an associated set of DL subframes (310) in the FDD carrier (300), resulting in a first set of UL subframes for which the physical UL shared channel is enabled to comprise HARQ, and a second set of UL subframes is not comprising HARQ, and assigning (703) UL channel resources for the HARQ feedback on the physical UL shared channel in said first set of UL subframes, according to said second DL HARQ timing, when there is no UL control channel assigned according to said first DL HARQ timing.