Beam refinement reference signal enhancement for higher mobility support

A method for wireless communication, comprising:

• receiving, using a first user equipment (UE) beam, a first message from a base station, the first message comprising a pre-grant communication and a plurality of downlink beam refinement reference signals;
• selecting a second UE beam based at least in part on the plurality of downlink beam refinement reference signals;
• transmitting, using the second UE beam, a second message to the base station in response to the first message, the second message comprising a pre-grant acknowledgment and a plurality of uplink beam refinement reference signals;
• and
• receiving a third message from the base station using the second UE beam, wherein a width of the second UE beam is smaller than a width of the first UE beam.

A method for wireless communication, comprising:

• receiving, using a first user equipment (UE) beam, a first message from a base station, the first message comprising a pre-grant communication and a plurality of downlink beam refinement reference signals;
• selecting a second UE beam based at least in part on the plurality of downlink beam refinement reference signals, wherein a width of the second UE beam is smaller than a width of the first UE beam;
• transmitting, using the second UE beam, a second message to the base station in response to the first message, the second message comprising a pre-grant acknowledgment and a plurality of uplink beam refinement reference signals, wherein the plurality of uplink beam refinement reference signals precede the pre-grant acknowledgment in time;
• and
• receiving a third message from the base station using the second UE beam.

An apparatus for wireless communication, in a system comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• transmit, using a first base station beam, a first message to a user equipment (UE), the first message comprising a pre-grant communication and a plurality of downlink beam refinement reference signals;
• receive a second message from the UE in response to the first message, the second message comprising a pre-grant acknowledgment and a plurality of uplink beam refinement reference signals;
• select a second base station beam based at least in part on the plurality of uplink beam refinement reference signals;
• and
• transmit, using the second base station beam, a third message to the UE, wherein a width of the second base station beam is less than a width of the first base station beam.