Method and apparatus for new radio unlicensed (NR-U) radio link monitoring preliminary class

1. A user equipment (UE), comprising:

radio front end circuitry configured to receive a reference signal from a source device via a radio link, wherein the reference signal is one of a synchronization signal block (SSB) signal or a channel state information reference signal (CSI-RS); and

processor circuitry coupled to the radio front end circuitry, the processor circuitry configured to:

measure a quality of the reference signal;

measure an evaluation time of the reference signal;

determine a first indicator of the radio link based on the quality of the reference signal;

determine a second indicator of the radio link based on the evaluation time of the reference signal, wherein the first indicator is based on a block error rate (BLER) and the second indicator is based on a factor of a listen before talk (LBT) procedure;

determine a status of a connection of the radio link based on the first indicator and the second indicator of the radio link; and

generate a message based the status of the connection, wherein the radio front end circuitry is further configured to transmit the message to the source device.

2. The UE of claim 1 , wherein to determine the first indicator, the processor circuitry is further configured to determine a first out of sync (OOS) indicator and determine a first in sync (IS) indicator.

3. The UE of claim 2 , wherein the first OOS indicator is based on the BLER and the first IS indicator is based on a second BLER.

4. The UE of claim 1 , wherein to determine the second indicator, the processor circuitry is further configured to determine a second out of sync (OOS) indicator and determine a second in sync (IS) indicator.

5. The UE of claim 4 , wherein the second OOS indicator is based on a first evaluation time threshold and the second IS indicator is based on a second evaluation time threshold.

6. The UE of claim 5 , wherein the first evaluation time threshold and the second evaluation time threshold are scaled by the factor of the LBT procedure.

7. A method for operating a user equipment (UE) in a wireless network, the method comprising:

receiving a reference signal from a source device via a radio link, wherein the reference signal is one of a synchronization signal block (SSB) signal or a channel state information reference signal (CSI-RS);

measuring a quality of the reference signal;

measuring an evaluation time of the reference signal;

determining a first indicator of the radio link based on the quality of the reference signal;

determining a second indicator of the radio link based on the evaluation time of the reference signal and using a factor of a listen before talk (LBT) procedure;

determining a status of a connection of the radio link based on the first indicator and the second indicator of the radio link;

generating a message based the status of the connection; and

transmitting the message to the source device.

8. The method of claim 7 , wherein determining the first indicator further comprises determining a first out of sync (OOS) indicator and determining a first in sync (IS) indicator.

9. The method of claim 8 , wherein determining the first OOS indicator is based on a first block error rate (BLER) and determining the first IS indicator is based on a second BLER.

10. The method of claim 7 , wherein determining the second indicator further comprises determining a second out of sync (OOS) indicator and determining a second in sync (IS) indicator.

11. The method of claim 10 , wherein determining the second OOS indicator is based on a first evaluation time threshold and determining the second IS indicator is based on a second evaluation time threshold.

12. The method of claim 11 , wherein the first evaluation time threshold and the second evaluation time threshold are scaled by the factor of the LBT procedure.

13. A non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform operations, the operations comprising:

receiving a synchronization signal block (SSB) signal and a channel state information reference signal (CSI-RS) from a source device via a radio link;

measuring qualities of the SSB signal and the CSI-RS;

measuring evaluation times of the SSB signal and the CSI-RS;

determining a first indicator of the radio link based on the qualities of the SSB signal and the CSI-RS;

determining a second indicator of the radio link based on the evaluation times of the SSB signal and the CSI-RS and using a factor of a listen before talk (LBT) procedure;

determining a status of a connection of the radio link based on the first indicator and the second indicator of the radio link;

generating a message based the status of the connection; and

transmitting the message to the source device.

14. The non-transitory computer-readable media of claim 13 , wherein determining the first indicator further comprises determining a first out of sync (OOS) indicator and determining a first in sync (IS) indicator.

15. The non-transitory computer-readable media of claim 14 , wherein determining the first OOS indicator is based on a first block error rate (BLER) and determining the first IS indicator is based on a second BLER.

16. The non-transitory computer-readable media of claim 13 , wherein determining the second indicator further comprises determining a second out of sync (OOS) indicator and determining a second in sync (IS) indicator.

17. The non-transitory computer-readable media of claim 16 , wherein determining the second OOS indicator is based on a first evaluation time threshold and determining the second IS indicator is based on a second evaluation time threshold.

18. The non-transitory computer-readable media of claim 17 , wherein the first evaluation time threshold and the second evaluation time threshold are scaled by the factor of the LBT procedure.