Point-dependent resource symbol configuration in a wireless cell

摘要

A high-power point and one or more low-power points transmit signals associated with the same cell-identifier in a heterogeneous cell deployment. Coverage areas corresponding to the low-power points fall at least partly within the coverage area for the high-power point, so that mobile stations within range of a low-power point are also within range of the high-power point. Channel-state-information reference symbols, CSI-RS, are transmitted using different CSI-RS resources on different transmission points within the cell, while configuration of CSI-RS measurement resources is conducted on a UE-specific basis. The choice of measurement resources to be used is determined by the network, based on the properties of the channels from the transmission points to the UE. As the UE moves around within the cell, the network tracks the channel properties and reconfigures the CSI-RS resources measured by the UE, to correspond to the resource of the closest transmission point or points.

主权项

1. A method in a network node for collecting channel-state-information (CSI) feedback in a wireless network that comprises a plurality of geographically separated transmission points sharing a cell identifier, the method comprising:
receiving CSI feedback from a mobile station, based on measurements of first CSI reference symbols (CSI-RS) transmitted on a first CSI-RS resource from a first one of the transmission points; detecting that the mobile station has approached a second one of the transmission points, differing from the first one of the transmission points; reconfiguring the mobile station, in response to said detecting, by transmitting a reconfiguration message to the mobile station, to measure CSI-RS on a second CSI-RS resource transmitted from the second one of the transmission points; and receiving CSI feedback from the mobile station, based on measurements of second CSI-RS transmitted on the second CSI-RS resource from the second one of the transmission points.