FIELD: physics, communications.
SUBSTANCE: invention relates to wireless communication. The base station is configured to communicate with a user terminal in a mobile communication system using a multiple input/multiple output (MIMO) scheme via precoding. The base station includes a receiving module which receives a precoding matrix index (PMI), which indicates a given precoding matrix, a determination module which determines the value of a flag indicator which indicates whether to use the precoding matrix given in the PMI for communication over a downlink, a control signal generating module which generates a downlink control signal which includes a flag indicator, and a transmitting module which transmits a signal, including a downlink control signal, over a downlink.
EFFECT: efficient utilisation of resources while simultaneously reducing the volume of downlink overhead.
18 cl, 11 dwg
