Qualcomm Incorporated

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Michael Levitsky

Ran Berliner

Ran Iron

Muhammad Nazmul Islam

Mark S Wallace

Prashanth Haridas Hande

Ruhua He

Junsheng Han

Walid Khairy Mohamed Ahmed

Christian Oliver Thelen

Ambarish Tripathi

Victor A Abramsky

Afshin Shiravi

Yeuda Raz

This disclosure provides systems, methods and apparatuses for protecting against transmit power violations in a radio unit (RU) of a disaggregated base station. For example, when a distributed unit (DU) provides frequency domain samples to the RU, the DU may set a reference input level that causes the RU scale a gain lineup to avoid saturation or sensitivity issues in a signal processing chain while ramping up to a required transmit power. Accordingly, to avoid signal saturation or clipping at the RU, the RU may monitor energy estimation measurements and take remedial action when a transmit power violation occurs. For example, the RU may provide one or more system alarms to the DU or prevent transmission over an air interface in cases where the energy estimation measurements fail to satisfy one or more thresholds.

Transmit power violation protection mechanism in a radio unit of a disaggregated base station

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine to initiate a random access channel (RACH) procedure with a base station (BS). The UE may determine, based at least in part on determining to initiate the RACH procedure, whether a timing alignment timer, associated with a timing alignment of the UE and the BS, is expired. The UE may initiate the RACH procedure using the timing alignment based at least in part on determining that the timing alignment timer is not expired. Numerous other aspects are provided.

RACH procedure with timing alignment

Methods, systems, and devices for wireless communications are described that provide for adjustment of a frequency offset based on switching between uplink/downlink (UL/DL) transmission/reception beam pairs between a UE and a base station. A connection may be established via a first UL/DL transmission/reception beam pair and a frequency tracking loop may be established and maintained to correct for frequency error (e.g., due to Doppler shift) of received transmissions at a receiving device. In cases where a beam switch is performed, and the UE and base station switch from the first UL/DL transmission/reception beam pair to a second UL/DL transmission/reception beam pair, and a frequency offset difference between the first and second UL/DL transmission/reception beam pairs may be applied to the frequency tracking loop. The frequency offset difference may be obtained from a table of frequency offset measurements of multiple UL/DL beam pairs using associated reference signal transmissions.

Frequency offset adjustment for beam switching in wireless communications

Various aspects described herein relate to adjusting transmit power of a radio frequency (RF) transceiver. A total power adjustment for adjusting a transmit power of the RF transceiver can be determined. The transmit power can be adjusted to a first adjusted transmit power based at least in part on a first adjustment size that is less than the total power adjustment and determined based at least in part on the transmit power. Digital pre-distortion (DPD) training of the RF transceiver can be performed to adjust one or more coefficients for calibrating the RF transceiver based on the first adjusted transmit power. The first adjusted transmit power can be adjusted to a second adjusted transmit power based at least in part on a second adjustment size that is less than the total power adjustment and computed based at least in part on the first adjusted transmit power.

Techniques for modifying transceiver power during digital pre-distortion training

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San Diego, CA, United States of America

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