Downlink multiple input multiple output enhancements for single-cell with remote radio heads

摘要

A base station selects a subset of at least one geographically separated antennas for each of the plurality of user equipments. The base station forms at least layer of data stream including modulated symbols, precodes the data stream via multiplication with the NT-by-N precoding matrix where N is the number of said layers and NT is the number of transmit antenna elements and transmits the precoded layers of data stream to the user equipment via the selected geographically separated antennas. The base station signals the subset of the plurality of geographically separated antennas via higher layer Radio Resource Control or via a down link grant mechanism. The base station optionally does not signal the subset of the plurality of geographically separated antennas to the corresponding mobile user equipment.

主权项

1. A method of wireless communication between a base station having a plurality of geographically separated antennas and a plurality of user equipments, comprising the steps of:
selecting at the base station a subset of at least one of the geographically separated antennas for each of the plurality of user equipments, said selecting occurring semi-statically for user equipment having a Doppler shift indicating a rate of motion is less than a predetermined amount and dynamically for user equipment having a Doppler shift indicating the rate of motion is greater than said predetermined amount; forming at least one layer of data stream for each of the plurality of user equipments, each of the data streams including modulated symbols; precoding the at least one layer of data stream for each of the plurality of user equipments via multiplication with an NT-by-N precoding matrix where N is the number of said layers and NT is the number of transmit antenna elements; and transmitting the precoded layers of data streams to each of the plurality of user equipments via the selected subsets of geographically separated antennas.