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1. WO2020163453 - SYSTÈMES ET PROCÉDÉS DE RETRANSMISSION DE REPRISE APRÈS DÉFAILLANCE DE FAISCEAU D'ACCÈS ALÉATOIRE SANS CONTENTION (CFRA-BFR) ET DE DÉTECTION DE DÉFAILLANCE DE FAISCEAU INTER CC

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[ EN ]

WHAT IS CLAIMED IS:

1. A user equipment (UE), comprising:

radio front end circuitry; and

processor circuitry, coupled to the radio front end circuitry, and configured to: receive, using the radio front end circuitry, one or more reference signals; in response to determining that a beam failure occurred for the one or more reference signals, determine a contention-free (CF) physical random access channel (PRACH) resource for a beam failure recovery (BFR) request; and

transmit, using the radio front circuitry, the BFR request using the determined CF PRACH resource.

2. The UE of claim 1, wherein to determine that the beam failure occurred, the processor circuitry is configured to determine one or more beam failure instances for the one or more reference signals occurred.

3. The UE of claim 2, wherein to determine the one or more beam failure instances, the processor circuitry is configured to determine that a block error rate (BLER) associated with at least one beam failure instance is above a threshold.

4. The UE of claim 1, wherein the PRACH to carry the BFR request is based on a newly identified beam (NIB).

5. The UE of claim 4, wherein to transmit the BFR request, the processor circuitry is

configured to transmit the NIB using the radio front end circuitry.

6. The UE of claim 5, wherein the processor circuitry is further configured to retransmit the NIB using the radio front end circuitry in response to not receiving a BFR response.

7. The UE of claim 5, wherein the processor circuitry is further configured to generate a second NIB, different from the NIB, and to transmit the second NIB using the radio front end circuitry in response to not receiving a BFR response.

8. The UE of claim 1, wherein the processor circuitry is further configured to receive, using the radio front end circuitry, a BFR response from a network node.

9. A method, comprising:

receiving, by a user equipment (UE) from a network node, one or more reference signals;

in response to determining that a beam failure occurred for the one or more reference signals, determining a contention-free (CF) physical random access channel (PRACH) resource for a beam failure recovery (BFR) request; and

transmitting the BFR request to the network node using the determined CF PRACH resource.

10. The method of claim 9, wherein the determining that the beam failure occurred comprises determining that one or more beam failure instances for the one or more reference signals occurred.

11. The method of claim 10, wherein the determining the one or more beam failure instances comprises determining that a block error rate (BLER) associated with at least one of beam failure instance is above a threshold.

12. The method of claim 9, wherein the PRACH to carry the BFR request is based on a newly identified beam (NIB).

13. The method of claim 12, wherein the transmitting the BFR request comprises transmitting the NIB.

14. The method of claim 13, further comprising:

retransmitting the NIB in response to not receiving a BFR response.

15. The method of claim 13, further comprising:

generating a second NIB, different from the NIB, in response to not receiving a BFR response; and

transmitting the second NIB to the network device.

16. The method of claim 9, further comprising:

receiving a BFR response from the network node.

17. A user equipment (UE), comprising:

a memory configured to store program instructions; and

a processor, upon executing the program instructions, configured to:

receive, from a network node, one or more reference signals;

in response to determining that a beam failure occurred for the one or more reference signals, determine a contention-free (CF) physical random access channel (PRACH) resource for a beam failure recovery (BFR) request; and

transmit the BFR request to the network node using the determined CF PRACH resource.

18. The UE of claim 17, wherein:

the CF-PRACH resource to carry the BFR request is based on a newly identified beam (NIB),

to transmit the BFR request the processor is configured to transmit the NIB, and the processor is further configured to retransmit the NIB in response to not receiving a BFR response.

19. The UE of claim 17, wherein the CF-PRACH resource to carry the BFR request is based on a newly identified beam (NIB), wherein the processor is further configured to:

transmit the NIB to transmit the BFR request; and

generate a second NIB, different from the NIB, in response to not receiving a BFR response; and

transmit the second NIB to the network device.

20. The UE of claim 17, wherein to determine that the beam failure occurred, the processor is configured to determine that a plurality of beam failure instances for the one or more reference signals occurred.