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

摘要

Methods, user equipment and controlling node for handling of stream restriction of the user equipment in a cellular communications system supporting four branch Multiple Input Multiple Output (MIMO) are disclosed. The user equipment supports 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 controls a base station. The user equipment signals at least one of said supported MIMO modes to the controlling node that determines one of said at least one MIMO modes to be used by the user equipment. The controlling node sends, to the user equipment, a mode instruction instructing the user equipment to use the determined MIMO mode.

主权项

1. A method in a user equipment for handling of stream restriction in a cellular communications system supporting four branch Multiple Input Multiple Output (MIMO), the cellular communications system comprising a base station serving a cell of the cellular communications system, and a controlling node controlling the base station, wherein the method comprises:
supporting one or more MIMO modes, which one or more MIMO modes are associated with four branch MIMO and one or more of a single stream restriction, a dual stream restriction and no restriction, signaling of at least one of said supported MIMO modes to the controlling node via the base station, and receiving, from the controlling node via the base station, in response to said signaling, a mode instruction instructing the user equipment to use one of said at least one MIMO modes signaled to the controlling node.