Patent ID: 9749029
Date: 2017-08-29
CPC Classifications: H04B,H04W

Claim:
1. A method of measuring a channel state by a user equipment in a network including a plurality of network nodes, the method comprising: receiving, from a network, channel state information-reference signal (CSI-RS) transmission pattern information, wherein the CSI-RS transmission pattern information indicates two orthogonal frequency division multiplexing (OFDM) symbols in a first slot of a subframe and at least two OFDM symbols in a second slot of the subframe are configured for CSI-RS transmission; receiving, from the network, information indicating the two OFDM symbols in the first slot of the subframe on which a muting operation will be performed for the user equipment; receiving channel state information-reference signals (CSI-RSs) of a first type network node in corresponding resource elements (REs) of the two OFDM symbols in the first slot of the subframe, wherein CSI-RSs of a second type network node are configured as zero-power CSI-RSs in the corresponding REs of the two OFDM symbols in the first slot of the subframe, and wherein the CSI-RSs of the second type network node are configured as non-zero power CSI-RSs on at least two OFDM symbols in the second slot of the subframe; receiving the CSI-RSs of the second type network node in at least two OFDM symbols in the second slot of the subframe; measuring a channel state of the first type network node for the corresponding REs of the two OFDM symbols in the first slot of the subframe; and transmitting information related to the measured channel state to the second type network node.