Aiot - methods for device originated autonomous (do-a) transmission in aiot

A method performed by a wireless transmit receive unit (WTRU), the method comprising:

• transmitting a first preamble sequence of a set of preamble sequences;
• receiving at least one second preamble sequence of the set of preamble sequences;
• determining that multiple second preamble sequences are received;
• and
• transmitting a second message to a second device of a plurality of devices associated with the multiple second preamble sequences indicating that the second device is to perform a contention-based random access procedure.

A wireless transmit receive unit (WTRU) comprising circuitry, including a transmitter, a receiver, a processor, and a memory, configured to:

• transmit a first preamble sequence of a set of preamble sequences;
• receive at least one second preamble sequence of the set of preamble sequences;
• determine whether a single second preamble sequence or multiple second preamble sequences are received;
• on a condition that the single second preamble sequence is received from a first device, transmit a first message to the first device indicating that the first device is to perform a contention-free random access procedure;
• and
• on a condition that the multiple second preamble sequences are received, transmit a second message to a second device of a plurality of devices associated with the multiple second preamble sequences indicating that the second device is to perform a contention-based random access procedure.