Reference signals design for time tracking in LTE-A

A method of wireless communication of an evolved Node B (eNB), comprising:

• configuring a user equipment (UE) to receive a transmission;
• transmitting to the UE at least one resource block in the transmission, wherein the at least one resource block comprises a first set of reference signals (RS) and a second set of RS in the transmission, wherein the first set of RS comprises UE-specific demodulation-RS (DM-RS) and the second set of RS comprises channel state information reference signals (CSI-RS);
• and
• transmitting to the UE information indicating whether or not the second set of RS is available to the UE.

A user equipment (UE), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• receive at least one resource block in a transmission, wherein the at least one resource block comprises a first set of reference signals (RS) comprising UE-specific demodulation-RS (DM-RS);
• determine whether a second set of RS comprising channel state information reference signals (CSI-RS), specific to the UE, is available in the transmission, wherein the at least one processor configured to determine is further configured to receive from an evolved Node B (eNB) information indicating whether the second set of RS is available or not;
• and
• process the received at least one resource block based on the first set of RS comprising UE-specific DM-RS and further based on the second set of RS comprising CSI-RS specific to the UE if determined available.

An evolved Node B (eNB), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• configure a user equipment (UE) to receive a transmission;
• transmit to the UE at least one resource block in the transmission, wherein the at least one resource block comprises a first set of reference signals (RS) and a second set of RS in the transmission, wherein the first set of RS comprises UE-specific demodulation-RS (DM-RS) for demodulation and the second set of RS comprises channel state information reference signals (CSI-RS) and
• transmit to the UE information indicating that the second set of RS is available to the UE.