Synchronization signal block based beam failure detection
AssigneeApple Inc.
InventorsGuotong WANG, Hua LI, Manasa RAGHAVAN, Yushu ZHANG, Jie CUI
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Abstract
Systems, apparatuses, methods, and computer-readable media are provided for performing Beam Failure Detection (BFD), and in particular, for performing Synchronization Signal Block (SSB) based BFD and/or Channel State Information Reference Signal (CSI-RS) based BFD. Disclosed embodiments include quasi co-location (QCL) and use case restrictions for SSB for BFD and Physical Downlink Control Channel (PDCCH), transition period handling for BFD, and implicit configuration SSB for BFD. Other embodiments may be described and/or claimed.
Claims25
A user equipment (UE) comprising:
- interface circuitry;
- and
- baseband circuitry coupled with the interface circuitry, the baseband circuitry to:
- determine at least one reference signal (RS) to be used for beam failure detection (BFD) based on a quasi co-location (QCL) of the RS with respect to another signal;
- and
- perform BFD using the determined RS.
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One or more non-transitory computer-readable storage media (CRSM) comprising instructions, wherein execution of the instructions by one or more processors is to cause a user equipment (UE) to:
- determine at least one reference signal (RS) to be used for beam failure detection (BFD) based on a quasi co-location (QCL) of the RS with respect to another signal;
- and
- perform BFD using the determined RS, wherein to perform the BFD, execution of the instructions is to cause the UE to:
- monitor one or more resources in which the RS is to be transmitted;
- estimate a downlink (DL) radio link quality on the monitored one or more resources over an evaluation period;
- declare a beam failure when a number of beam failure instance indications from a physical layer entity reaches a configured threshold before a configured timer expires, wherein the number of beam failure instance indications are based on the estimated DL radio link quality;
- and
- trigger a beam failure recovery procedure in response to declaration of the beam failure.
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A user equipment (UE) comprising:
- means for determining a reference signal (RS) to be used for beam failure detection (BFD) based on a quasi co-location (QCL) relationship between the RS and at least one channel state information RS (CSI-RS) or a demodulation RS (DMRS) of a physical downlink control channel (PDDCH);
- and
- means for performing the BFD using the determined RS.
Dependencies are inferred from the claim text.