Transmitting uplink control information in a two-step random access procedure

An apparatus for wireless communications, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• identify a configuration for multiplexing uplink control information on an uplink random access message of a two-step random access procedure;
• generate the uplink random access message, the uplink random access message comprising a random access preamble and an uplink shared channel resource unit;
• identify a trigger for inclusion of the uplink control information with the uplink random access message;
• multiplex the uplink control information and a reference signal with the uplink shared channel resource unit;
• map the uplink control information to resource elements in the uplink shared channel resource unit based at least in part on a priority of the uplink control information and a location of resource elements to which the reference signal is mapped, wherein at least some different types of uplink control information are mapped to different resource elements;
• and
• transmit the uplink random access message comprising the uplink control information to a base station.

An apparatus for wireless communications, comprising:

• means for identifying a configuration for multiplexing uplink control information on an uplink random access message of a two-step random access procedure;
• means for generating the uplink random access message, the uplink random access message comprising a random access preamble and an associated uplink shared channel resource unit;
• means for identifying a trigger for inclusion of the uplink control information with the uplink random access message;
• means for multiplexing the uplink control information and a reference signal in the uplink shared channel resource unit based on the configuration;
• means for mapping the uplink control information to resource elements in the uplink shared channel resource unit based at least in part on a type of the uplink control information and a location of resource elements to which the reference signal is mapped, wherein at least some different types of uplink control information are mapped to different resource elements;
• and
• means for transmitting the uplink random access message comprising the uplink control information to a base station.

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

• identifying a configuration for multiplexing uplink control information on an uplink random access message of a two-step random access procedure;
• generate the uplink random access message, the uplink random access message comprising a random access preamble and an associated uplink shared channel resource unit;
• identify a trigger for inclusion of the uplink control information with the uplink random access message;
• multiplex the uplink control information and a reference signal in the uplink shared channel resource unit based on the configuration;
• map the uplink control information to resource elements in the uplink shared channel resource unit based at least in part on a type of the uplink control information and a location of resource elements to which the reference signal is mapped, wherein at least some different types of uplink control information are mapped to different resource elements;
• and
• transmit the uplink random access message comprising the uplink control information to a base station.