Beam Failure Recovery CORESET Prioritization in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing beam failure recovery in next-generation networks, particularly in high-frequency bands, due to increased channel estimation and blind decode complexities, which can lead to PDCCH blocking probabilities and excessive resource usage.
Innovation Solution
The proposed solution involves configuring User Equipment (UE) with multiple CORESETS, prioritizing channel estimation and blind decode attempts based on maximum allowed numbers, and selectively ignoring certain control channel elements to reduce channel estimation and blind decode loads during beam failure recovery, ensuring efficient resource allocation and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs channel estimation and blind decode attempts in multiple CORESETs during beam failure recovery, then the reliability of beam failure recovery is improved, but the device complexity and processing load increase
Solution Approach 1:
The patent divides the beam failure recovery process into two distinct CORESETs: a first CORESET for normal operations and a second CORESET specifically for beam failure recovery. This segmentation allows the UE to perform channel estimation and blind decode attempts separately in each CORESET, improving recovery reliability while managing device complexity through structured organization of processing tasks.
Solution Approach 2:
The patent implements dynamic switching between CORESETs based on beam failure detection. When beam failure is detected, the UE dynamically transitions to using the second CORESET for monitoring PDCCH candidates, while normally operating with the first CORESET. This dynamic adaptation allows the system to maintain high reliability during failure events while keeping normal operations simple.
2Adaptability or versatility
If the UE monitors PDCCH candidates in both first and second CORESETs simultaneously, then the beam failure recovery capability is enhanced, but the resource usage and processing overhead increase
Solution Approach 1:
The patent assigns different functional qualities to different CORESETs: the first CORESET is optimized for normal operation with standard monitoring parameters, while the second CORESET is specifically configured for beam failure recovery with tailored PDCCH candidate monitoring. This local optimization allows each CORESET to perform its specific function efficiently without unnecessary processing overhead.
Solution Approach 2:
The second CORESET is pre-configured with specific PDCCH candidate parameters and monitoring configurations before beam failure occurs. When beam failure is detected, the UE can immediately utilize the pre-prepared second CORESET configuration, avoiding the need to dynamically create new configurations and reducing processing overhead during the critical recovery phase.
3Reliability
If the UE increases the number of blind decode attempts and channel estimation attempts, then the probability of successful PDCCH reception is improved, but the time consumption and processing delay increase
Solution Approach 1:
The patent segments the blind decode and channel estimation attempts across two separate CORESETs, allowing the UE to distribute processing load over time. The first CORESET handles normal monitoring with standard attempt rates, while the second CORESET is activated for beam failure recovery with configured attempt rates, preventing concentration of all processing demands in a single time window.
Solution Approach 2:
The patent implements periodic monitoring of PDCCH candidates in the second CORESET according to configured patterns and time windows. This periodic approach allows the UE to perform necessary channel estimation and blind decode attempts at scheduled intervals rather than continuously, reducing overall processing time while maintaining reliable detection of recovery indications.
Data Source
AI summary
A method and apparatus are disclosed. The method includes the UE (User Equipment) being configured with a first CORESET (Control Resource Set). The method also includes the UE being configured with a second CORESET. The method further includes the UE transmitting a preamble for beam failure recovery in response to the UE detecting that beam failure occurs. And the method includes the UE monitoring and/or receiving a DCI scrambled by C-RNTI in the second CORESET in the second slot in response to transmitting the preamble for beam failure recovery. Furthermore, the method includes the UE prioritizing to receive and/or demodulate the DCI scrambled by C-RNTI in the second CORESET in the second slot, if the first number plus the third number exceeds the first maximum number or the second number plus the fourth number exceeds the second maximum number in the second slot.