UE beam reselection procedure with CSI reporting and beam switch indication

A method performed by a processor of a user equipment (UE) for UE beam reselection, comprising:

• receiving from a base station a P3 beam management (BM) channel state information reference signal (CSI-RS) transmitted over a serving base station beam including repetitions of a P3 BM CSI-RS resource transmitted on a first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol, and another signal that is multiplexed with the P3 BM CSI-RS resource on the first OFDM symbol;
• evaluating a first UE beam using the first OFDM symbol and a second UE beam using the second OFDM symbol based on the P3 BM CSI-RS;
• determining whether to perform a UE beam switch from the first UE beam to the second UE beam based on the evaluation of the first UE beam using the first OFDM symbol and the second UE beam using the second OFDM symbol;
• sending to the base station a P3 BM report based on the P3 BM CSI-RS, wherein the P3 BM report includes a channel state information feedback (CSF) report corresponding to the first or the second selected UE beam and an indication of whether the UE will perform a UE beam switch from the first UE beam to the second UE beam;
• and
• in response to determining to perform the UE beam switch from the first UE beam to the second UE beam:
• performing the beam switch from the first UE beam to the second UE beam during a UE beam switch slot;
• and
• receiving from the base station information scheduling a PDSCH allocation that includes adjusted PDSCH parameters based on the CSF included in P3 BM report.

A base station, comprising:

• a processor configured with processor executable instructions to perform operations comprising:
• transmitting to a UE a P3 beam management (BM) channel state information reference signal (CSI-RS) over a serving base station beam;
• receiving from the UE a P3 BM report for the serving base station beam in response to the P3 BM CSI-RS;
• determining whether the P3 BM report includes an indication that the UE will perform a UE serving beam switch from a first UE beam to a second UE beam;
• determining a UE beam switch slot during which the UE will perform the beam switch in response to determining that the P3 BM report includes an indication that the UE will perform the UE serving beam switch from the first UE beam to a second UE beam;
• determining adjusted downlink transmission parameters based on channel state feedback (CSF) included in the P3 BM report, wherein the CSF included in the P3 BM report provides information about a channel associated with a beam pair of the serving base station beam and the second UE beam;
• and
• starting at the UE beam switch slot, sending a physical downlink shared data channel (PDSCH) transmission to the UE using the adjusted downlink transmission parameters over the channel associated with the beam pair of the serving base station beam and the second UE beam.

A user equipment (UE), comprising:

• a processor configured with processor executable instructions to perform operations comprising:
• receiving from a base station a P3 beam management (BM) channel state information reference signal (CSI-RS) over a serving base station beam including repetitions of a P3 BM CSI-RS resource transmitted on a first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol, and another signal that is multiplexed with the P3 BM CSI-RS resource on the first OFDM symbol;
• evaluating a first UE beam using the first OFDM symbol and a second UE beam using the second OFDM symbol based on the P3 BM CSI-RS;
• determining whether to perform a UE beam switch from the first UE beam to the second UE beam based on the evaluation of the first UE beam using the first OFDM symbol and the second UE beam using the second OFDM symbol;
• sending to the base station a P3 BM report based on the P3 BM CSI-RS, wherein the P3 BM report includes a channel state information feedback (CSF) report corresponding to the first or the second selected UE beam and an indication of whether the UE will perform a UE beam switch from the first UE beam to the second UE beam;
• and
• in response to determining to perform the UE beam switch from the first UE beam to the second UE beam:
• performing the beam switch from the first UE beam to the second UE beam during a UE beam switch slot;
• and
• receiving from the base station information scheduling a PDSCH allocation that includes adjusted PDSCH parameters based on the CSF included in P3 BM report.