Beam Failure Recovery Mechanism Using Priority Transmission Modes
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in reliably recovering from beam failures in secondary cells during carrier aggregation, which can lead to radio link failures and affect service quality.
Innovation Solution
The implementation of mechanisms such as beam sweeping and repetition to enhance the reliability of beam failure recovery messaging, including the use of media access control (MAC) control elements sent using higher priority transmission modes, to improve the reliability of beam recovery processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery messaging is sent using standard transmission modes, then the complexity of the system is kept simple, but the reliability of beam recovery is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple transmission mechanisms for MAC CEs before beam failure occurs. The gNB and UE have predetermined multiple transmission opportunities and associated mechanisms (such as different physical channels, repetition schemes, or diversity methods) ready to be activated when beam failure is detected, eliminating the need for complex real-time decisions during recovery
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting transmission parameters (such as modulation and coding scheme, transmission power, repetition count, or resource allocation) for MAC CEs based on the detected beam failure condition. This allows the system to adapt transmission characteristics to ensure reliable delivery without permanently increasing system complexity
2Reliability
If standard transmission mechanisms are used for MAC CEs, then the system operation is simple, but the reliability of recovery messaging is insufficient
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously select and execute appropriate transmission mechanisms for MAC CEs based on pre-configured rules and the detected beam failure condition. The UE automatically determines which transmission opportunity and mechanism to use without requiring complex real-time coordination or intervention from the gNB, maintaining operational simplicity while improving reliability
3Reliability
If single transmission opportunity is provided for MAC CEs, then the transmission process is simple, but the reliability of beam failure recovery is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple transmission opportunities for MAC CEs before beam failure occurs. The gNB and UE have predetermined multiple transmission opportunities with associated resources and parameters ready to be activated when beam failure is detected, eliminating the need for complex real-time decisions during recovery
Solution Approach 2:
The patent employs periodic action by providing multiple transmission opportunities for MAC CEs at predetermined intervals or time instances. This allows the system to attempt recovery messaging at multiple scheduled points, increasing the probability of successful delivery while maintaining a structured and manageable transmission approach
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for performing beam failure recovery involving a secondary cell.