Multi-user MIMO transmissions in wireless communication systems

摘要

An apparatus and method for providing control information in a Multi User-Multiple Input Multiple Output (MU-MIMO) wireless communication system is provided. The method includes receiving a plurality of Resource Elements (REs) including Downlink Control Information (DCI), determining, using the DCI, a set of REs to which a plurality of Downlink Reference Signals (DRSs) may be mapped, determining remaining REs as REs to which data is mapped, and demodulating the data using a precoding vector of a DRS corresponding to the MS.

主权项

1. A method for determining a power ratio of Resource Elements (REs) transmitted by a Mobile Station (MS), the method comprising:
determining a type of multiplexing used for multiplexing the Dedicated Reference Signals (DRS) REs; if the type of multiplexing is determined to be one of Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM), determining if thea number of DRSs transmitted by thea Base Station (BS) is known; if the number of transmitted DRSs is known, setting thea Physical Downlink Shared Channel (PDSCH) data to DRS power ratio to correspond to the number of transmitted DRSs; and if the number of transmitted DRSs is not known, determining if thea maximum number of DRSs that may be transmitted is known; if the maximum number of DRSs that may be transmitted is known:, setting the PDSCH to DRS power ratio to correspond to athe maximum number of DRSs that may be transmitted; and otherwiseif the number of transmitted DRSs and the maximum number of DRSs are not known, setting the PDSCH to DRS power ratio to 0 dB.