Control resource set selection for channel state information reference signal-based radio link monitoring
A device of a New Radio (NR) User Equipment (UE), a method and a machine readable medium to implement the method. The device includes a Radio Frequency (RF) interface, and processing circuitry coupled to the RF interface, the processing circuitry to: decode a signal from a NR evolved node B (gNodeB) including an indication of one or more control resource sets (CORESETs); select a CORESET based on the indication; and determine a downlink radio link quality based on the CORESET.
1. An apparatus including memory, and processing circuitry coupled to the memory, the processing circuitry configured to:
receive configuration of two or more control resource sets (CORESETs), wherein a same configured channel state information reference signal (CSI-RS) or synchronization signal block (SSB) is quasi-co-located (QCLed) with each of the two or more configured CORESETs;
decode a signal from a base station that identifies one of the configured CORESETs to be used for radio link monitoring (RLM);
select the identified one configured CORESET; and
determine a hypothetical physical downlink control channel (PDCCH) block error rate (BLER) based on the configured CSI-RS or SSB and the configured CORESET identified by the signal from the base station; and
trigger an out-of-sync (OOS) indication in response to a determination that the BLER is higher than a OOS threshold.
2. The apparatus of claim 1 , wherein the processing circuitry is further configured to:
determine whether downlink radio link quality estimated over a last T Evaluate_out__SSB period becomes worse than a threshold Q out_SSB within a T Evaluate_out_SSB evaluation period; and
determine whether the downlink radio link quality estimated over a last T Evaluate_in_SSB period becomes better than a threshold Q in_SSB within a T Evaluate_in_SSB evaluation period, wherein T Evaluate_out_SSB and T Evaluate_in_SSB are based on whether a carrier frequency range for the configured SSB corresponds to a FR1 carrier frequency range or a FR2 carrier frequency range.
3. The apparatus of claim 1 wherein the processing circuitry is further configured to:
determine whether downlink radio link quality estimated over a last T Evaluate_out_CSI-RS period becomes worse than a threshold Q out_CSI-RS within a T Evaluate_out_CSI-RS evaluation period; and
determine whether the downlink radio link quality estimated over a last T Evaluate_in_CSI-RS period becomes better than a threshold Q in_CSI-RS within a T Evaluate_in_CSI-RS evaluation period, wherein T Evaluate_out_CSI-RS and T Evaluate_in_CSI-RS are based on whether a carrier frequency range for the configured CSI-RS corresponds to a FR1 carrier frequency range or a FR2 carrier frequency range.
4. The apparatus of claim 1 , wherein an evaluation period for estimation of downlink radio link quality is based on whether a carrier frequency range for the configured CSI-RS or SSB corresponds to a FR1 carrier frequency range or a FR2 carrier frequency range.
5. The apparatus of claim 4 , wherein the evaluation period is further based on whether a reception configuration includes a discontinuous reception mode (DRX mode).
6. A method to be performed at a User Equipment (UE), the method including:
receive configuration of two or more control resource sets (CORESETs), wherein a same configured channel state information reference signal (CSI-RS) or synchronization signal block (SSB) is quasi-co-located (QCLed) with each of the two or more configured CORESETs;
decoding a signal from a base station that identifies one of the configured CORESETs to be used for radio link monitoring (RLM);
selecting the identified one configured CORESET; and
determining a hypothetical physical downlink control channel (PDCCH) block error rate (BLER) based on the configured CSI-RS or SSB and the configured CORESET identified by the signal from the base station; and
triggering an out-of-sync (OOS) indication in response to a determination that the BLER is higher than a OOS threshold.
7. The method of claim 6 , wherein the method further includes determining downlink radio link quality for the configured CSI-RS or SSB by estimating the downlink radio link quality and comparing it to thresholds Q out and Q in , wherein Q out corresponds to an out-of-sync block error rate (BLER out ) and-Q in corresponds to an in-sync block error rate (BLERm).
8. The method of claim 7 , wherein an evaluation period for estimation of downlink radio link quality is based on whether a carrier frequency range for the configured CSI-RS or SSB corresponds to a FR1 carrier frequency range or a FR2 carrier frequency range, and on whether a reception configuration includes a discontinuous reception mode (DRX mode).
9. The method of claim 8 , wherein the evaluation period is further based on at least one a sub-frame configuration cycle TCSI-RS, or a discontinuous reception cycle TDRX.