Compact downlink control information for a two-step random access channel procedure

An apparatus for wireless communications at a 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:
• transmit, to a base station, a first message of a four-step random access procedure, wherein an attribute of the first message indicates a request for a second type of control signaling that comprises fewer bits than a first type of control signaling;
• receive a second message of the four-step random access procedure comprising the second type of control signaling based at least in part on the first message;
• and
• communicate with the base station on resources scheduled by the second message on a downlink shared channel.

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

• receiving, from a user equipment (UE), a first message of a two-step random access procedure, wherein an attribute or a content of the first message indicates a request for a second type of control signaling that comprises fewer bits than a first type of control signaling;
• transmitting a second message of the two-step random access procedure comprising the second type of control signaling based at least in part on the first message, wherein the second type of control signaling schedules the UE with resources for a downlink shared channel;
• and
• communicating with the UE on the resources that are scheduled by the second message on the downlink shared channel.

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

• receiving, from a user equipment (UE), a first message of a four-step random access procedure, wherein an attribute of the first message indicates a request for a second type of control signaling that comprises fewer bits than a first type of control signaling;
• transmitting a second message of the four-step random access procedure comprising the second type of control signaling based at least in part on the first message, wherein the second type of control signaling schedules the UE with resources for a downlink shared channel;
• and
• communicating with the UE on the resources that are scheduled by the second message on the downlink shared channel.