Hybrid dedicated reference signal method and system

A base station comprising:

• a multiple-input multiple-output (MIMO) antenna;
• a processor for generating multiple resource blocks (RBs), wherein:
• each RB of the multiple RBs comprises multiple resource elements (REs);
• the REs comprise at least one dedicated reference signal (DRS) specific to a single wireless transmit/receive unit (WTRU) and at least one control-type data symbol;
• the at least one control-type data symbol comprises a DRS mode indicator signaling any of multiple DRS modes;
• in a first DRS mode of the multiple DRS modes, a first configuration of REs is used for the at least one DRS and the at least one DRS comprises a respective at least one single beamformed or precoded pilot;
• and
• in a second DRS mode of the multiple DRS modes, a second configuration of the REs is used for the at least one DRS and the at least one DRS comprises a respective at least one composite beamformed or precoded pilot;
• and
• a transmitter for transmitting the generated RBs via the MIMO antenna.

A base station comprising:

• a processor, transmitter and a multiple-input multiple output (MIMO) antenna, wherein:
• the transmitter is configured to transmit multiple resource blocks (RBs) via the MIMO antenna;
• each RB of the multiple RBs comprises multiple resource elements (REs);
• the REs comprise at least one dedicated reference signal (DRS) specific to a single wireless transmit/receive unit (WTRU) and at least one control-type data symbol;
• the at least one control-type data symbol comprises a DRS mode indicator signaling any of a plurality of DRS modes;
• in a first DRS mode of the multiple DRS modes, a first configuration of REs is used for the at least one DRS and the at least one DRS comprises a respective at least one single beamformed or precoded pilot;
• and
• in a second DRS mode of the multiple DRS modes, a second configuration of the REs is used for the at least one DRS and the at least one DRS comprises a respective at least one composite beamformed or precoded pilot.