Abstract
Methods, devices, and systems for physical random access channel (PRACH) access. A WTRU transmits a message to a gNB. The message includes a PRACH preamble from a first set. The method also includes performing a hidden node detection procedure prior to a random access response (RAR) window. The RAR window corresponds to the transmitted message. The method also includes attempting to receive a RAR in response to the transmitted message, during the RAR window. The method also includes retransmitting the message to the gNB, including a PRACH preamble from a second set, if the RAR is not received during the RAR window and a hidden node is detected; and retransmitting the message to the gNB, including a PRACH preamble from the first set, if the RAR is not received during the RAR window and the hidden node is not detected.
Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A wireless transmit/receive unit (WTRU) configured for random access to a channel, the WTRU comprising:
a receiver configured to receive a first set of PRACH preambles and a second set of PRACH preambles; a transmitter configured to transmit a message to a gNB, the message including a PRACH preamble from the first set; a processor configured to perform a hidden node detection procedure prior to a random access response (RAR) window, the RAR window corresponding to the transmitted message; the receiver configured to attempt to receive a RAR in response to the transmitted message, during the RAR window; the receiver configured to, on a condition that the RAR is not received during the RAR window and that a hidden node is detected, retransmit the message to the gNB, wherein the retransmitted message includes a PRACH preamble from the second set; and the receiver configured to, on a condition that the RAR is not received during the RAR window and that the hidden node is not detected, retransmit the message to the gNB, wherein the retransmitted message includes a PRACH preamble from the first set.
2. The WTRU of claim 1, wherein the hidden node detection procedure comprises a listen before talk (LBT) procedure to detect hidden nodes.
3. The WTRU of claim 1, wherein the transmitter is configured to retransmit the retransmitted message with power ramping on the condition that the hidden node is detected, and wherein the transmitter is configured to retransmit the retransmitted message without power ramping on the condition that the hidden node is not detected.
4. The WTRU of claim 1, wherein the transmitter is configured to, on a condition that the hidden node is not detected, retransmit the retransmitted message with power ramping on a condition that the WTRU has switched transmission antenna beam from the transmitted message.
5. The WTRU of claim 1, wherein the transmitter is configured to, on a condition that the hidden node is not detected, retransmit the retransmitted message without power ramping on a condition that the WTRU has not switched antenna beam from the transmitted message.
6. The WTRU of claim 1, wherein the transmitter is configured to, on a condition that the hidden node is detected, retransmit the retransmitted message without power ramping and using a same antenna beam as the transmitted message.
7. The WTRU of claim 1, wherein the processor is configured to perform a listen before talk (LBT) procedure prior to the transmitter transmitting the message to the gNB.
8. The WTRU of claim 7, wherein the transmitter is configured to transmit the message to the gNB based on power ramping on a condition that the LBT procedure has failed a threshold number of times.
9. The WTRU of claim 7, wherein the processor is configured to repeat the LBT procedure on a condition that the LBT procedure has not failed a threshold number of times.
10. The WTRU of claim 7, wherein the transmitter is configured to, on a condition that the LBT procedure has failed a threshold number of times, retransmit the message using additional PRACH resources; and wherein the receiver is configured to, on a condition that the LBT procedure has failed the threshold number of times, attempt to receive the RAR in an extended RAR window.
11. A method for random access to a channel by a wireless transmit/receive unit (WTRU), the method comprising:
receiving a first set of PRACH preambles and a second set of PRACH preambles; transmitting a message to a gNB, the message including a PRACH preamble from the first set; performing a hidden node detection procedure prior to a random access response (RAR) window, the RAR window corresponding to the transmitted message; attempting to receive a RAR in response to the transmitted message, during the RAR window; on a condition that the RAR is not received during the RAR window and that a hidden node is detected, retransmitting the message to the gNB, wherein the retransmitted message includes a PRACH preamble from the second set; and on a condition that the RAR is not received during the RAR window and that the hidden node is not detected, retransmitting the message to the gNB, wherein the retransmitted message includes a PRACH preamble from the first set.
12. The method of claim 11, wherein the hidden node detection procedure comprises a listen before talk (LBT) procedure to detect hidden nodes.
13. The method of claim 11, wherein the retransmitted message is retransmitted with power ramping on the condition that the hidden node is detected, and wherein the retransmitted message is retransmitted without power ramping on the condition that the hidden node is not detected.
14. The method of claim 11, wherein on a condition that the hidden node is not detected the retransmitted message is retransmitted with power ramping on a condition that the WTRU has switched transmission antenna beam from the transmitted message.
15. The method of claim 11, wherein on a condition that the hidden node is not detected, the retransmitted message is retransmitted without power ramping on a condition that the WTRU has not switched antenna beam from the transmitted message.
16. The method of claim 11, wherein on a condition that the hidden node is detected, the retransmitted message is retransmitted without power ramping and using a same antenna beam as the transmitted message.
17. The method of claim 11, further comprising performing a listen before talk (LBT) procedure prior to transmitting the message to the gNB.
18. The method of claim 17, further comprising transmitting the message to the gNB based on power ramping on a condition that the LBT procedure has failed a threshold number of times.
19. The method of claim 17, further comprising repeating the LBT procedure on a condition that the LBT procedure has not failed a threshold number of times.
20. The method of claim 17, further comprising, on a condition that the LBT procedure has failed a threshold number of times, retransmitting the message using additional PRACH resources and attempting to receive the RAR in an extended RAR window.
Associated Portfolios
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Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.