Patent ID: 8903006
Filing Date: 2014-12-02
Classification: H04B,H04L

Abstract:
1. A method for transmitting channel state information, CSI, for a downlink transmission from a base station at a user equipment, UE, through an uplink in a wireless communication system, the method comprising: receiving a downlink signal through a downlink channel; generating the CSI including at least one of a rank indicator, RI, a precoding matrix indicator, PMI, and a channel quality indicator, CQI, for the downlink channel; and transmitting the CSI through an uplink channel, wherein the CSI includes at least one of a first type CSI that is determined based on rank N determined by the UE and a second type CSI that is determined based on a rank restricted by a reference value M, wherein if the uplink channel is a physical uplink shared channel, PUSCH, the first type CSI or the second type CSI is transmitted based on downlink control information, DCI, including a CSI report request field, and wherein the first type CSI or the second type CSI is transmitted based on whether an index of a downlink subframe in which the DCI is received or an index of an uplink subframe in which the CSI is transmitted is 2k+1 (where k is a natural number).