A user equipment (UE) may be categorized into one or more capability categories based on its ability to generate hybrid automatic repeat request (HARQ) responses within a predetermined delay or slot. HARQ timing management may consider a UE capability category that is UE dependent. The UE may provide a HARQ response different (i.e., advancing or delaying HARQ timing) than the specified or default HARQ response timing of the UE's category with some limitations and constraints. A constraint is a condition in which one or more operation parameters of the UE do not satisfy or meet a predetermined level or setting.