Random access procedure for latency reduction

A method in a network node, the method comprising:

• broadcasting a location of a time and/or frequency resource of a first Physical Random Access Channel (PRACH);
• broadcasting a location of a time and/or frequency resource of a second PRACH, the second PRACH being different from the first PRACH and the second PRACH using different subcarriers than the first PRACH;
• receiving a first random access attempt from a wireless device via the first PRACH;
• and
• receiving a second random access attempt from the wireless device via the second PRACH;
• wherein the first PRACH and the second PRACH each have an associated preamble, and wherein the second PRACH preamble has a different length than the first PRACH preamble.

A wireless device comprising:

• processing circuitry configured to:
• receive a location of a time and/or frequency resource of a first Physical Random Access Channel (PRACH) from a network node;
• receive a location of a time and/or frequency resource of a second PRACH, the second PRACH being different from the first PRACH and the second PRACH using different subcarriers than the first PRACH;
• transmit a first random access attempt via the first PRACH;
• and
• transmit a second random access attempt via the second PRACH;
• wherein the first PRACH and the second PRACH each have an associated preamble, and wherein the second PRACH preamble has a different length than the first PRACH preamble.

A network node comprising:

• processing circuitry configured to:
• broadcast a location of a time and/or frequency resource of a first Physical Random Access Channel (PRACH);
• broadcast a location of a time and/or frequency resource of a second PRACH, the second PRACH being different from the first PRACH and the second PRACH using different subcarriers than the first PRACH;
• receive a first random access attempt from a wireless device via the first PRACH;
• and
• receive a second random access attempt from the wireless device via the second PRACH;
• wherein the first PRACH and the second PRACH each have an associated preamble, and wherein the second PRACH preamble has a different length than the first PRACH preamble.