Beam selection for higher uplink performance in view of exposure limits

An apparatus for wireless communication, comprising:

• memory;
• and
• one or more processors coupled to the memory, the one or more processors being configured, individually or collectively, to:
• receive, from a wireless device, a plurality of signals via a plurality of beams;
• measure a received signal power for each of the beams, based on the received plurality of signals;
• determine a transmit power limit for each of the beams based at least in part on a radio frequency (RF) exposure limit;
• determine an estimation of a signal quality at the wireless device for each of the beams based at least in part on the received signal powers and the transmit power limits, wherein to determine the estimation of the signal quality, the one or more processors are further configured, individually or collectively, to estimate an uplink signal-to-noise ratio (SNR) at the wireless device for each of the beams based at least in part on the received signal power and the transmit power limit for the respective beam;
• select one of the beams based on the estimations of the signal qualities for the beams, wherein to select the one of the beams, the one or more processors are further configured, individually or collectively, to select the one of the beams based on the estimated uplink SNRs;
• and
• transmit a signal via the selected beam.

A method of wireless communication by a wireless device, comprising:

• receiving, from another wireless device, a plurality of signals via a plurality of beams;
• measuring a received signal power for each of the beams, based on the received plurality of signals;
• determining a transmit power limit for each of the beams based at least in part on a radio frequency (RF) exposure limit, wherein determining the transmit power limit for each of the beams comprises:
• adjusting a maximum transmit power for the RF exposure limit based on an uplink traffic duration over a time interval;
• and
• determining a product of the maximum transmit power and a tunable parameter associated with the uplink traffic duration over the time interval;
• determining an estimation of a signal quality at the other wireless device for each of the beams based at least in part on the received signal powers and the transmit power limits;
• selecting one of the beams based on the estimations of the signal qualities for the beams;
• and
• transmitting a signal via the selected beam.

An apparatus for wireless communication, comprising:

• memory;
• and
• one or more processors coupled to the memory, the one or more processors being configured, individually or collectively, to:
• receive, from a wireless device, a plurality of signals via a plurality of beams;
• measure a received signal power for each of the beams, based on the received plurality of signals;
• determine a transmit power limit for each of the beams based at least in part on a radio frequency (RF) exposure limit, wherein to determine the transmit power limit for each of the beams, the one or more processors are further configured, individually or collectively, to:
• adjust a maximum transmit power for the RF exposure limit based on an uplink traffic duration over a time interval;
• and
• determine a product of the maximum transmit power and a tunable parameter associated with the uplink traffic duration over the time interval;
• determine an estimation of a signal quality at the wireless device for each of the beams based at least in part on the received signal powers and the transmit power limits;
• select one of the beams based on the estimations of the signal qualities for the beams;
• and
• transmit a signal via the selected beam.