Random access procedures for non-terrestrial networks

A user equipment (UE), comprising:

• a processor;
• a transceiver;
• memory coupled with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the UE to:
• transmit, via the transceiver to a network entity, a random access request message associated with a random access procedure using a set of transport block sizes and a power control, the random access request message including a random access payload that comprises a buffer status report or uplink data, or both, wherein a first subset of transport block sizes of the set of transport block sizes is associated with a first size for a first portion of the random access payload and a second subset of transport block sizes of the set of transport block sizes is associated with a second size for a second portion of the random access payload;
• monitor, via the processor, a response window based at least in part on transmitting the random access request message;
• and
• receive, via the transceiver from the network entity, a response message during the response window.

An apparatus for wireless communication at a user equipment (UE), comprising:

• means for transmitting, to a network entity, a random access request message associated with a random access procedure using a set of transport block sizes and a power control, the random access request message including a random access payload that comprises a buffer status report or uplink data, or both, wherein a first subset of transport block sizes of the set of transport block sizes is associated with a first size for a first portion of the random access payload and a second subset of transport block sizes of the set of transport block sizes is associated with a second size for a second portion of the random access payload;
• means for monitoring a response window based at least in part on transmitting the random access request message;
• and
• means for receiving, from the network entity, a response message during the response window.

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

• transmit, to a network entity, a random access request message associated with a random access procedure using a set of transport block sizes and a power control, the random access request message including and a random access payload that comprises a buffer status report or uplink data, or both, wherein a first subset of transport block sizes of the set of transport block sizes is associated with a first size for a first portion of the random access payload and a second subset of transport block sizes of the set of transport block sizes is associated with a second size for a second portion of the random access payload;
• monitor a response window based at least in part on transmitting the random access request message;
• and
• receive, from the network entity, a response message during the response window.