Handling of channel access problems

An apparatus for wireless communication, comprising:

• means for determining to send a transmission to a first base station on a first unlicensed frequency channel of an unlicensed frequency spectrum;
• means for determining, for one or more attempts of a listen before talk (LBT) protocol, whether each attempt is a failed attempt or a successful attempt;
• means for determining that the first unlicensed frequency channel is one of:
• unavailable based on the LBT protocol failing due to at least one of a number of failed attempts exceeding a first threshold number of failed attempts or a duration of failed attempts exceeding a first threshold duration, or
• available based on the LBT protocol being successful for the transmission;
• and
• means for sending a report to the first base station indicating whether the first unlicensed frequency channel is unavailable or available through a unicast radio resource control (RRC) message or a medium access control (MAC) control element (CE).

An apparatus for wireless communication, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• determine to send a transmission to a first base station on a first unlicensed frequency channel of an unlicensed frequency spectrum;
• determine, for one or more attempts of a listen before talk (LBT) protocol, whether each attempt is a failed attempt or a successful attempt;
• determine that the first unlicensed frequency channel is one of:
• unavailable based on the LBT protocol failing due to at least one of a number of failed attempts exceeding a first threshold number of failed attempts or a duration of failed attempts exceeding a first threshold duration, or
• available based on at least one attempt of the LBT protocol being successful for the transmission;
• and
• send a report to the first base station indicating whether the first unlicensed frequency channel is unavailable or available through a unicast radio resource control (RRC) message or a medium access control (MAC) control element (CE).

A method of wireless communication of a wireless device at a first base station, comprising:

• determining a failure of a listen before talk (LBT) protocol for a transmission from a user equipment (UE) to the first base station through an unlicensed frequency spectrum, wherein the determining the failure of the LBT protocol for the transmission from the UE comprises:
• receiving a report from the UE indicating the failure of the LBT protocol for the transmission from the UE through the unlicensed frequency spectrum;
• and
• determining the failure of the LBT protocol for the transmission from the UE based on the received report;
• and
• performing, based on the determination of the failure of the LBT protocol for the transmission from the UE, one of changing a secondary cell at the first base station for the UE for communication through the unlicensed frequency spectrum or handing over the UE to a primary cell at a second base station for communication through the unlicensed frequency spectrum.