Beam Failure Detection in Dormancy BWP Without CORESETs
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Solution Overview
Problem
In wireless communication systems, particularly in the dormancy bandwidth part (BWP) of 5G networks, beam failure detection (BFD) is challenging due to the absence of configured control resource sets (CORESETs), making it difficult for user equipment (UE) to determine which resources or reference signals to monitor for BFD.
Innovation Solution
The base station (BS) configures the UE with explicit or implicit BFD reference signals (RSs) that are quasi-co-located (QCLed) with a CORESET in a non-dormancy BWP, allowing the UE to perform BFD in the dormancy BWP by monitoring these RSs, even without a configured CORESET in the dormancy BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE operates in dormancy BWP to save power, then power consumption is reduced, but beam failure detection becomes difficult due to absence of configured CORESETs
Solution Approach 1:
The base station pre-configures the UE with BFD reference signals and associated parameters before the UE enters dormancy mode. This preliminary configuration enables the UE to perform beam failure detection in dormancy BWP without requiring active CORESET configuration, thus maintaining reliability while saving power.
Solution Approach 2:
The patent introduces BFD reference signals as an intermediary mechanism that enables beam failure detection functionality in dormancy BWP. These reference signals serve as a mediator between the UE and the beam management system, allowing detection capabilities without full CORESET activation.
2Reliability
If the UE monitors BFD RSs in dormancy BWP, then beam failure detection capability is maintained, but device complexity increases
Solution Approach 1:
The patent applies local quality by configuring BFD monitoring only in specific scenarios (dormancy BWP) rather than universally. The UE monitors BFD reference signals with simplified parameters specifically when in dormancy mode, rather than maintaining full monitoring complexity in all states.
Solution Approach 2:
The base station configures specific parameters for BFD reference signal monitoring in dormancy BWP, including resource indicators, quasi-co-location relationships, and failure detection thresholds. These parameter changes enable tailored monitoring behavior that reduces complexity compared to full CORESET-based monitoring.
3Productivity
If the UE switches back from dormancy BWP to non-dormancy BWP, then communication capability is restored, but activation time is delayed due to lack of beam failure detection
Solution Approach 1:
The UE performs beam failure detection and potential beam recovery procedures while in dormancy mode, before switching back to non-dormancy BWP. This preliminary action ensures that beam synchronization is already established when activation occurs, eliminating activation delay.
Solution Approach 2:
The patent enables continuous beam failure detection operation across dormancy and non-dormancy states. By maintaining BFD monitoring in dormancy BWP, the useful action of beam management continues uninterrupted, ensuring seamless transition and immediate communication capability upon activation.
Data Source
AI summary
Wireless communications systems and methods related to beam failure detection (BFD) in a dormancy bandwidth part (BWP) are provided. A user equipment (UE) determines to operate in a dormancy mode for a cell of a wireless communication network. The UE operates in the dormancy mode for the cell of the wireless communication network, where the operating in the dormancy mode includes performing a beam failure detection (BFD) in a dormancy bandwidth part (BWP) based on a configuration. The configuration may include a control resource set (CORESET) configuration for the dormancy BWP.