Random access procedure for latency reduction
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsTuomas Tirronen, Osman Nuri Can Yilmaz, Helka-Liina Määttanen, Henrik Sahlin
Life of this patent
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Abstract
Certain embodiments disclose a method in a wireless device. The wireless device receives a location of a time and/or frequency resource of a first Physical Random Access Channel (PRACH) from a network node. The wireless device receives a location of a time and/or frequency resource of a second PRACH. Furthermore, the wireless device transmits a first random access attempt via the first PRACH and transmits a second random access attempt via the second PRACH. 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.
Claims24
A method in a wireless device, the method comprising:
- receiving a location of a time and/or frequency resource of a first Physical Random Access Channel (PRACH) from a network node;
- receiving a location of a time and/or frequency resource of a second PRACH;
- transmitting a first random access attempt via the first PRACH;
- and
- transmitting 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;
- and
- wherein downlink control information indicates the preamble to be used by the wireless device when sending random access attempts via the second PRACH.
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;
- 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;
- and
- wherein downlink control information indicates the preamble to be used by the wireless device when sending random access attempts via the second PRACH.
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;
- 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;
- and
- wherein downlink control information indicates the preamble to be used by the wireless device when sending random access attempts via the second PRACH.
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;
- 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;
- and
- wherein downlink control information indicates the preamble to be used by the wireless device when sending random access attempts via the second PRACH.
Dependencies are inferred from the claim text.