Coexistence of multiple uplink control channel formats for wireless communication with power spectral density limitation

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

• at least one processor;
• and
• a memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor, causes the apparatus to:
• determine whether a transmission power of a random access request exceeds a reference threshold;
• select a first random access resource allocation when the transmission power does not exceed the reference threshold;
• select a second random access resource allocation when the transmission power exceeds the reference threshold;
• transmit the random access request in the first random access resource allocation or the second random access resource allocation;
• transmit an uplink control message using a first uplink resource allocation based on the first random access resource allocation being selected;
• and
• transmit the uplink control message using a second uplink resource allocation based on the second random access resource allocation being selected.

A method of wireless communication at a base station (BS), the method comprising:

• receiving, from a user equipment (UE) over a random access channel, a random access request;
• determining whether the random access request is received on one or more resources within a first random access resource allocation or a second random access resource allocation;
• monitoring for an uplink control message within a resource block of a first uplink resource allocation when the random access request is received on the one or more resources within the first random access resource allocation;
• and
• monitoring for the uplink control message across a plurality of contiguous resource blocks of a second uplink resource allocation when the random access request is received on the one or more resources within the second random access resource allocation.

An apparatus for wireless communication at a base station, the apparatus comprising:

• at least one processor;
• and
• a memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor, causes the apparatus to:
• receive, from a user equipment (UE) over a random access channel, a random access request;
• determine whether the random access request is received on one or more resources within a first random access resource allocation or a second random access resource allocation;
• monitor for an uplink control message within a resource block of a first uplink resource allocation when the random access request is received on the one or more resources within the first random access resource allocation;
• and
• monitor for the uplink control message across a plurality of contiguous resource blocks of a second uplink resource allocation when the random access request is received on the one or more resources within the second random access resource allocation.