Random access procedure timing designs

A method of wireless communications, comprising:

• determining, by a processor, a configuration to determine, by a user equipment, a random access procedure timeline, from multiple random access procedure timelines that each define a different duration between one or more messages that are communicated in a random access procedure;
• receiving, by the processor from the user equipment, a random access preamble based on the random access procedure timeline;
• and
• determining, by the processor, a response to the random access preamble based on the random access procedure timeline.

An apparatus for wireless communication, comprising:

• a transceiver;
• a memory configured to store instructions;
• and
• one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to execute the instructions to cause the apparatus to:
• transmit, to a user equipment, a configuration to determine a random access procedure timeline from multiple random access procedure timelines that each define a different duration between one or more messages that are communicated in a random access procedure;
• receive, from the user equipment, a first message on a physical random access channel, wherein the first message includes a random access preamble;
• transmit, to the user equipment and based on the random access procedure timeline, a second message on a downlink channel in response to the first message, wherein the second message includes an uplink grant for the user equipment;
• receive, from the user equipment and based on the random access procedure timeline, a request or indicator on an uplink channel based on the uplink grant;
• and
• transmit, to the user equipment, a downlink control channel for an acknowledgement message or a negative acknowledgement message corresponding to the request or indicator.

An apparatus for wireless communication, comprising:

• a transceiver;
• a memory configured to store instructions;
• and
• one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to execute the instructions to cause the apparatus to:
• determine a configuration to determine, by a user equipment, a random access procedure timeline, from multiple random access procedure timelines that each define a different duration between one or more messages that are communicated in a random access procedure;
• receive, from the user equipment, a random access preamble based on the random access procedure timeline;
• and
• determine a response to the random access preamble based on the random access procedure timeline.