Techniques for transmission of sounding reference signal in shared radio frequency spectrum band

A method for wireless communication at a base station, comprising:

• configuring wireless communications at a user equipment (UE) using two or more uplink component carriers (CCs) in a wireless communications network, wherein a first uplink CC of the two or more uplink CCs uses a shared radio frequency (RF) spectrum band that is available for unlicensed use;
• configuring each of the two or more uplink CCs to be in a same timing advance group (TAG);
• and
• configuring a sounding reference signal (SRS) to be transmitted in a first symbol, based at least in part on a minimum guaranteed power level that is to be used when transmitting using the first uplink CC, using the first uplink CC of the two or more uplink CCs concurrently with one or more of a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission to be transmitted during the first symbol using a second uplink CC of the two or more uplink CCs.

An apparatus for wireless communication, 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:
• establish wireless communications using two or more uplink component carriers (CCs) in a wireless communications network, wherein a first uplink CC of the two or more uplink CCs uses a shared radio frequency (RF) spectrum band that is available for unlicensed use;
• identify that each of the two or more uplink CCs are configured to be in a same timing advance group (TAG);
• identify a sounding reference signal (SRS) to be transmitted in a first symbol using the first uplink CC of the two or more uplink CCs;
• determine that one or more of a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission is to be transmitted in the first symbol using a second uplink CC of the two or more uplink CCs;
• determine that the transmission during the first symbol using the two or more uplink CCs is power limited;
• transmit the SRS in the first symbol, using a minimum guaranteed power level configured for transmission of the first uplink CC, using the first uplink CC, and transmit one or more of the PUSCH or PUCCH using the second uplink CC.

An apparatus for wireless communication, 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:
• configure wireless communications at a user equipment (UE) using two or more uplink component carriers (CCs) in a wireless communications network, wherein a first uplink CC of the two or more uplink CCs uses a shared radio frequency (RF) spectrum band that is available for unlicensed use;
• configure each of the two or more uplink CCs to be in a same timing advance group (TAG);
• and
• configure a sounding reference signal (SRS) to be transmitted in a first symbol, based at least in part on a minimum guaranteed power level configured for transmission of the first uplink CC, using the first uplink CC of the two or more uplink CCs concurrently with one or more of a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission to be transmitted during the first symbol using a second uplink CC of the two or more uplink CCs.