Patent ID: 9357424
Filing Date: 2016-05-31
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for collecting channel-state-information (CSI) feedback in a wireless network that comprises a plurality of geographically separated transmission points, the method comprising: identifying a first set of CSI reference symbol (CSI-RS) resources corresponding to the union of CSI-RS resources used by a plurality of transmission points that share a cell identifier; configuring a mobile station to measure first CSI-RS on a first subset of the first set of CSI-RS resources, the first subset corresponding to CSI-RS resources used by a first subset of the transmission points, including at least a first one of the plurality of transmission points; configuring the remaining portion of the first set of CSI-RS resources as zero-power CSI-RS resources for the mobile station, so that none of the first set of CSI-RS resources are used for downlink data; simultaneously transmitting CSI-RS on a first CSI-RS resource from the first one of the transmission points and from a third one of the transmission points, wherein the third one of the transmission points is selected so that the effective channel to the mobile station formed by the first and third ones of the transmission points is dominated by the first one of the transmission points; and receiving first CSI feedback from the mobile station, based on measurements of the first CSI-RS.