Radio link monitoring (RLM) evaluation mechanism for new radio (NR) systems
Methods, systems, and storage media are described for radio link monitoring (RLM) for new radio (NR). Other embodiments may be described and/or claimed.
1. One or more non-transitory, computer-readable media having instructions that, when executed, cause a user equipment (UE) to:
receive, from a network, an indication regarding a plurality of reference signals (RSs), wherein the indication indicates a first type of RSs of the plurality of RSs are to be evaluated, and a second type of RSs of the plurality of RSs are not to be evaluated, wherein the first type is selected as one of a synchronization sequence block (SSB) type or a channel state information-reference signal (CSI-RS) type, and the second type of RSs is different from the first type of RSs;
determine, based on the received indication that the plurality of RSs and a physical downlink control channel (PDCCH) signal are configured with a beamforming configuration for an evaluation period, wherein the beamforming configuration is a same beamforming configuration associated with a hypothetical PDCCH transmission; and
evaluate the first type of RSs for the evaluation period by comparing the first type of RSs with the hypothetical PDCCH transmission based on the beamforming configuration.
2. The one or more non-transitory, computer-readable media of claim 1 , wherein the instructions, when executed further cause the UE to:
determine a quality of a connection between the UE and a base station based on the evaluation of the plurality of RSs; and
determine an out-of-sync state or in-sync state of the PDCCH based on the determined quality of the connection.
3. The one or more non-transitory, computer-readable media of claim 1 , wherein the PDCCH is a cell-specific PDCCH, a UE-specific PDCCH, or a machine-type communications physical downlink control channel (MPDCCH).
4. The one or more non-transitory, computer-readable media of claim 1 , wherein the beamforming configuration is a transmit beamforming configuration associated with a base station of the network, or a receive beamforming configuration associated with the UE.
5. The one or more non-transitory, computer-readable media of claim 1 , wherein the evaluation period is at least one subframe or at least one time slot.
6. The one or more non-transitory, computer-readable media of claim 1 , wherein the plurality of RSs further include a CSI-RS.
7. The one or more non-transitory, computer-readable media of claim 1 , wherein the instructions, when executed, further cause the UE to:
determine, based on the signal from the network, which RSs of the plurality of RSs, and which PDCCH signals of a plurality of PDCCH signals, are configured with the beamforming configuration for the evaluation period.
8. One or more non-transitory, computer-readable media having instructions that, when executed, cause a base station to:
generate an indication regarding a plurality of reference signals (RSs), wherein the plurality of RSs and a physical downlink control channel (PDCCH) signal are configured with a beamforming configuration for an evaluation period, wherein the beamforming configuration is a same beamforming configuration associated with a hypothetical PDCCH transmission, wherein the indication indicates a first type of RSs of the plurality of RSs are to be evaluated, and a second type of RSs of the plurality of RSs are not to be evaluated, wherein the first type is selected as one of a synchronization sequence block (SSB) type or a channel state information-reference signal (CSI-RS) type, and the second type of RSs is different from the first type of RSs; and
transmit or cause to transmit the plurality of RSs over a network to a user equipment (UE) to cause the UE to evaluate the first type of RSs for the evaluation period by comparing the first type of RSs with the hypothetical PDCCH transmission based on the beamforming configuration.
9. The one or more non-transitory, computer-readable media of claim 8 , wherein the PDCCH is a cell-specific PDCCH, a UE-specific PDCCH, or a machine-type communications physical downlink control channel (MPDCCH).
10. The one or more non-transitory, computer-readable media of claim 8 , wherein the beamforming configuration is a transmit beamforming configuration associated with the base station of the network or a receive beamforming configuration associated with the UE.
11. The one or more non-transitory, computer-readable media of claim 8 , wherein the evaluation period is at least one subframe or at least one time slot.
12. The one or more non-transitory, computer-readable media of claim 8 , wherein the plurality of RSs further include a CSI-RS.
13. The one or more non-transitory, computer-readable media of claim 8 , wherein the beamforming configuration information is to include a bitmap to indicate synchronization signal blocks (SSBs) that are to be used for the plurality of RSs.
14. The one or more non-transitory, computer-readable media of claim 1 , wherein the instructions, when executed further cause the UE to evaluate the plurality of RSs for the evaluation period to produce a signal quality metric, and further map the signal quality metric to a block error rate (BLER) associated with the hypothetical PDCCH transmission.
15. The one or more non-transitory, computer-readable media of claim 14 , wherein the BLER of the hypothetical PDCCH transmission is used to determine an out-of-sync (OOS) or in-sync (IS) state of the PDCCH signal.
16. An apparatus comprising:
a memory to store a beamforming configuration and an indication, wherein a plurality of reference signals (RSs) and a physical downlink control channel (PDCCH) signal are configured with the beamforming configuration for an evaluation period, wherein the beamforming configuration is a same beamforming configuration associated with a hypothetical PDCCH transmission used to evaluate the plurality of RSs, wherein the indication indicates a first type of RSs of the plurality of RSs are to be evaluated, and a second type of RSs of the plurality of RSs are not to be evaluated, wherein the first type is selected as one of a synchronization sequence block (SSB) type or a channel state information-reference signal (CSI-RS) type, and the second type of RSs is different from the first type of RSs; and
processing circuitry, coupled with the memory, to:
evaluate the first type of RSs for the evaluation period by comparing the first type of RSs with the hypothetical PDCCH transmission based on the beamforming configuration.
17. The apparatus of claim 16 , wherein the beamforming configuration for the plurality of RSs includes base station transmit (Tx) beamforming configuration information and UE receive (Rx) beamforming configuration information.
18. The apparatus of claim 16 , wherein to evaluate the first type of RSs for the evaluation period, the processing circuitry is to evaluate the plurality of RSs for the evaluation period to produce a signal quality metric, and further map the signal quality metric to a block error rate (BLER) of the hypothetical PDCCH transmission.
19. The apparatus of claim 16 , wherein the plurality of RSs include a CSI-RS.
20. The apparatus of claim 16 , wherein the evaluation period is at least one subframe or at least one time slot.
21. The one or more non-transitory, computer-readable media of claim 1 , wherein the first type of RSs include RSs with a number of highest Reference Signal Received Powers (RSRPs).
22. The one or more non-transitory, computer-readable media of claim 8 , wherein the first type of RSs include RSs with a number of highest Reference Signal Received Powers (RSRPs).
23. The apparatus of claim 16 , wherein the first type of RSs include RSs with a number of highest Reference Signal Received Powers (RSRPs).