Random access channel transmissions for frame based equipment systems

An apparatus for wireless communications by a first user equipment (UE), comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, from a network device over an unlicensed radio frequency spectrum band, a broadcast message comprising system information, the system information indicating a listen-before-talk (LBT) mode of the network device and a set of random access channel resources associated with a fixed frame period;
• monitor a wireless channel of the unlicensed radio frequency spectrum band during the fixed frame period for control information from the network device based at least in part on the indicated LBT mode;
• determine, based at least in part on the monitoring, that the network device has access to the wireless channel during the fixed frame period;
• and
• perform, based at least in part on the determining, a random access channel transmission during the fixed frame period using the set of random access channel resources associated with the fixed frame period, wherein a validity of the set of random access channel resources is based at least in part on a duration associated with a frame of the fixed frame period.

An apparatus for wireless communications by a first user equipment (UE), comprising:

• means for receiving, from a network device over an unlicensed radio frequency spectrum band, a broadcast message comprising system information, the system information indicating a listen-before-talk (LBT) mode of the network device and a set of random access channel resources associated with a fixed frame period;
• means for monitoring a wireless channel of the unlicensed radio frequency spectrum band during the fixed frame period for control information from the network device based at least in part on the indicated LBT mode;
• means for determining, based at least in part on the monitoring, that the network device has access to the wireless channel during the fixed frame period;
• and
• means for performing, based at least in part on the determining, a random access channel transmission during the fixed frame period using the set of random access channel resources associated with the fixed frame period, wherein a validity of the set of random access channel resources is based at least in part on a duration associated with a frame of the fixed frame period.

A non-transitory computer-readable medium storing code for wireless communications by a first user equipment (UE), the code comprising instructions executable by a processor to:

• receive, from a network device over an unlicensed radio frequency spectrum band, a broadcast message comprising system information, the system information indicating a listen-before-talk (LBT) mode of the network device and a set of random access channel resources associated with a fixed frame period;
• monitor a wireless channel of the unlicensed radio frequency spectrum band during the fixed frame period for control information from the network device based at least in part on the indicated LBT mode;
• determine, based at least in part on the monitoring, that the network device has access to the wireless channel during the fixed frame period;
• and
• perform, based at least in part on the determining, a random access channel transmission during the fixed frame period using the set of random access channel resources associated with the fixed frame period, wherein a validity of the set of random access channel resources is based at least in part on a duration associated with a frame of the fixed frame period.