Listen-before-talk and channel reservation for millimeter wave systems

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:
• transmit, to a user equipment (UE), a pre-grant message indicating that a downlink transmission is available for transmission to the UE on a first radio frequency (RF) spectrum band, wherein the first RF spectrum band comprises a RF spectrum band above 6 GHz;
• receive, from the UE, a response to the pre-grant message on a second RF spectrum band, wherein the second RF spectrum band comprises a RF spectrum band above 6 GHz;
• and
• transmit, based at least in part on receiving the response to the pre-grant message, the downlink transmission to the UE using one or more of a set of transmit beams on the first RF spectrum band.

An apparatus for wireless communication, comprising:

• means for transmitting a pre-grant message to a user equipment (UE) indicating that a downlink transmission is available for transmission to the UE, wherein the downlink transmission is available for transmission on a first radio frequency (RF) spectrum band, wherein the first RF spectrum band comprises a RF spectrum band above 6 GHz;
• means for receiving, from the UE, a response to the pre-grant message on a second RF spectrum band, wherein the second RF spectrum band comprises a RF spectrum band below 6 GHz;
• and
• means for transmitting, based at least in part on receiving the response to the pre-grant message, the downlink transmission to the UE using one or more of a set of transmit beams on the first RF spectrum band.

A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:

• transmit a pre-grant message to a user equipment (UE) indicating that a downlink transmission is available for transmission to the UE, wherein the downlink transmission is available for transmission on a first radio frequency (RF) spectrum band, wherein the first RF spectrum band comprises a RF spectrum band above 6 GHz;
• receive, from the UE, a response to the pre-grant message on a second RF spectrum band, wherein the second RF spectrum band comprises a RF spectrum band below 6 GHz;
• and
• transmit, based at least in part on receiving the response to the pre-grant message, the downlink transmission to the UE using one or more of a set of transmit beams on the first RF spectrum band.