HANDLING OF STREAM RESTRICTION IN A CELLULAR COMMUNICATIONS SYSTEM SUPPORTING FOUR BRANCH MIMO

摘要

Methods, user equipment (120) and controlling node (130)for handling of stream restriction of the user equipment (120) in a cellular communications system (100) supporting four branch MIMO are disclosed. The user equipment 120 supports (201) one or more MIMO modes associated with four branch MIMO and one or more of a single stream restriction, a dual stream restriction and no restriction. The controlling node (130) controls a base station (110). The user equipment (120)signals (202) at least one of said supported MIMO modes to the controlling node (130)that determines (203) one of said at least one MIMO modes to be used by the user equipment (120). The controlling node (130) sends(204),to the user equipment (120),a mode instruction instructing the user equipment 120 to use the determined MIMO mode.