HYBRID AUTOMATIC REPEAT REQUEST TIMING FOR REDUCED TRANSMISSION TIME INTERVALS

摘要

Systems, methods and apparatus are described for wireless communication including hybrid automatic repeat request (HARQ) feedback in a system that supports communications using transmission time intervals (TTIs) of different durations. The base station may identify the ability of a user equipment (UE) to provide HARQ feedback for transmissions that use TTIs of shorter duration compared to other TTIs supported in the system. The base station may select the HARQ timing mode based on the capability of the UE, and may indicate the selected HARQ timing mode to the UE. The base station may then transmit one or more data transmissions to the UE using the reduced TTIs. The UE may respond with HARQ feedback based on the HARQ timing mode. The HARQ timing mode may be based on different response times based on the location of the data transmission in the TTI or the location of the data transmission in other TTIs.