Control signaling of beam failure detection
Systems, apparatuses, and methods for control signaling of beam failure detection are disclosed. A beam pair link may be comprised of multiple bandwidth parts (BWPs) or component carriers (CCs). In one embodiment, a beam failure detection reference signal (BFD RS) may be configured, with subsequent BFD RS instances defining a BFD RS periodicity. A BFD periodicity for monitoring the BFD RS may be configured to be less than, or equal or greater than the BFD RS periodicity. A beam failure may be declared if a minimum number of BFD RS instances, either within the BFD periodicity, or nearest the BFD periodicity if no instances fall within the BFD periodicity, fall below a predetermined threshold. The BFD periodicity and BFD RS may be configured for all BWPs/CCs, a subset of BWPs/CCs, or each individual BWP/CC.
1. A user equipment (UE), comprising:
processing circuitry; and
control circuitry coupled to the processing circuitry, wherein the control circuitry is to detect, with at least one of a plurality of downlink reference signals (RSs), a beam failure instance of a beam in at least one of a plurality of active bandwidth parts (BWPs) or component carriers (CCs) comprising the beam, at least one of the plurality of active BWPs or CCs associated with the at least one of the plurality of downlink RSs and a beam failure detection (BFD) counter, and the processing circuitry is to cause the beam failure instance to be declared,
wherein a first RS instance of the at least one of the plurality of downlink RSs and a second RS instance of the at least one of the plurality of downlink RSs define an RS periodicity, and
wherein the control circuitry is to detect the beam failure instance based upon a quality of an instance of the at least one of the plurality of downlink RSs that falls within a BFD period that is equal to or greater than the RS periodicity and the BFD period is determined based at least in part on two or more RS periodicities corresponding to a subset of the plurality of downlink RSs across the plurality of active BWPs or CCs.
2. The UE of claim 1 , wherein the control circuitry is to increment the BFD counter associated with a BWP or CC each time a quality of an RS instance of the at least one of the plurality of downlink RSs associated with the BWP or CC falls below a predetermined threshold.
3. The UE of claim 1 , wherein the control circuitry is to detect the beam failure instance when a quality of each of a predetermined number of instances of the downlink RS within the BFD period falls below a predetermined threshold.
4. The UE of claim 3 , wherein the BFD counter associated with the at least one of the plurality of active BWPs or CCs is incremented each time an instance of the at least one of the plurality of downlink RSs falls below the predetermined threshold, and the control circuitry is to detect the beam failure instance when the BFD counter meets or exceeds the predetermined number of instances.
5. The UE of claim 3 , wherein the predetermined number of instances is fixed, is to be configured by signaling from a layer above a MAC layer or a PHY layer, or is determined by the UE.
6. The UE of claim 1 , wherein the control circuitry is to initiate a beam failure recovery process on the at least one of the plurality of active BWPs or CCs upon beam failure instance detection.
7. The UE of claim 1 , wherein the control circuitry is to maintain an independent beam failure detection process and beam failure recovery process for each of the plurality of active BWPs or CCs.
8. The UE of claim 1 , wherein the processing circuitry is to declare the beam failure instance when the beam failure instance is detected in all or a subset of the plurality of active BWPs or CCs comprising the beam.
9. The UE of claim 1 , wherein the control circuitry is to reset the BFD counter when either no beam failure instance is detected within the BFD period, or the UE declares a radio link failure.
10. The UE of claim 9 , wherein the control circuitry is to maintain the BFD counter and beam failure recovery (BFR) timer for each BWP or CC.
11. The UE of claim 1 , wherein the processing circuitry is configured to:
report the declared beam failure instance; and
initiate a beam failure recovery process upon reporting of the beam failure instance.
12. One or more non-transitory computer-readable media (CRM) comprising instructions that, when executed by one or more processors of a User Equipment (UE), cause the UE to:
detect, with at least one of a plurality of downlink reference signals (RSs), a beam failure instance of a beam in at least one of a plurality of active bandwidth parts (BWPs) or component carriers (CCs) comprising the beam, at least one of the plurality of active BWPs or CCs associated with the at least one of the plurality of downlink RSs and a beam failure detection (BFD) counter; and
report the beam failure instance;
wherein a first RS instance of the at least one of the plurality of downlink RSs and a second RS instance of the at least one of the plurality of downlink RSs define an RS periodicity; and
detect the beam failure instance based upon a quality of an instance of the at least one of the plurality of downlink RSs that falls within a BFD period that is equal to or greater than the RS periodicity and the BFD period is determined based at least in part on two or more RS periodicities corresponding to a subset of the plurality of downlink RSs across the plurality of active BWPs or CCs.
13. The CRM of claim 12 , wherein the instructions are to further cause the one or more processors to initiate a beam failure recovery process upon reporting of the beam failure instance.
14. The CRM of claim 12 , wherein the instructions are to further cause the one or more processors to detect, when no BFD RS is within the BFD period, the beam failure instance when a quality of a BFD RS most recent to the BFD period falls below a predetermined threshold.
15. The CRM of claim 12 , wherein the BFD counter associated with a BWP or CC is incremented each time a quality of an RS instance of the at least one downlink RS associated with the BWP or CC falls below a predetermined threshold.
16. A User Equipment (UE), comprising:
processing circuitry; and
control circuitry coupled to the processing circuitry, wherein the control circuitry is to:
detect individual beam failure instances based on multiple downlink reference signal (RS) resources with one or more active bandwidth parts (BWPs) or component carriers (CCs);
report the individual beam failure instances,
wherein a first RS instance of the multiple downlink RS resources and a second instance of the multiple downlink RS resources define an RS periodicity; and
detect at least one individual beam failure instance based on a quality of an instance of at least one downlink RS that falls within a beam failure detection (BFD) period that is equal to or greater than the RS periodicity and the BFD period is determined based at least in part on two or more RS periodicities corresponding to a subset of the multiple downlink RS resources across the one or more active BWPs or CCs.
17. The UE of claim 16 , wherein the control circuitry is to initiate—a beam failure recovery process upon detection of an individual beam failure instance.
18. The UE of claim 17 , wherein the control circuitry—is to generate a plurality of beam failure detection reference signals for each of the one or more active BWPs or CCs.