Tracking reference signal for new radio

An apparatus for wireless communication, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• identify, by a user equipment (UE) in a connected mode with a base station, a set of resources for a tracking reference signal periodically received from the base station in a first transmission time interval (TTI), the tracking reference signal comprising a plurality of sub-patterns for a set of sub-carriers of a carrier for the UE for a set of symbol periods in the first TTI, the plurality of sub-patterns spanning a first portion of a bandwidth of the carrier;
• receive the tracking reference signal on the identified set of resources from the base station;
• and
• perform frequency and time tracking of the carrier based at least in part on the received tracking reference signal.

An apparatus for wireless communication, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• determine, by a base station, a set of resources for a tracking reference signal in a first transmission time interval (TTI), the set of resources comprising a plurality of sub-patterns for a set of sub-carriers of a carrier for a user equipment (UE) for a set of symbol periods in the first TTI, the plurality of sub-patterns spanning a first portion of a bandwidth of the carrier;
• and
• transmit, periodically by the base station, the tracking reference signal on the determined set of resources to the UE.