Wireless Communication Beam Failure Recovery via Signal-Based Random Access
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Solution Overview
Problem
Existing wireless communication systems lack a solution for processing beam failure events effectively, particularly in 5G networks, where beamforming technologies are used but fail to address subsequent actions when link quality deteriorates.
Innovation Solution
A method for wireless communication that involves a terminal device selecting a random access sequence based on signal quality in a secondary signal set when the primary signal set becomes too poor, utilizing different beams and protocol layers to determine and initiate link reconfiguration, including the use of contention-free or contention-based random access resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming technology is used to improve coverage and spectrum efficiency, then signal directionality and coverage are improved, but the system becomes vulnerable to beam failure when link quality deteriorates
Solution Approach 1:
The terminal device pre-measures signal quality of multiple beams before beam failure occurs and prepares alternative beam information in advance. When beam failure is detected, the pre-prepared beam information is immediately used for recovery, avoiding the need for complex real-time beam search and reducing recovery time.
Solution Approach 2:
The system implements continuous feedback mechanisms where the terminal device monitors beam quality metrics (such as RSRP) and reports to the network device. Based on this feedback, the network device can proactively adjust beam configurations or provide alternative beam information, preventing complete link failure.
2Reliability
If the terminal device monitors beam quality continuously to detect beam failure, then link quality is maintained, but signaling overhead and processing complexity increase
Solution Approach 1:
Instead of monitoring all beams continuously, the terminal device focuses measurement resources on the active beam and a limited set of candidate beams. This localized monitoring approach maintains detection accuracy for critical beams while reducing overall signaling overhead and processing requirements.
Solution Approach 2:
The system dynamically adjusts monitoring parameters such as measurement frequency, threshold values, and the number of monitored beams based on current link conditions. When link quality is good, monitoring intensity is reduced; when degradation is detected, monitoring becomes more intensive, optimizing the balance between detection accuracy and overhead.
3Adaptability or versatility
If multiple random access resources are configured for different signal sets, then beam failure recovery capability is improved, but resource management complexity increases
Solution Approach 1:
Random access resources are segmented and associated with specific signal sets or beam groups. Each signal set has its dedicated random access resources configured, allowing the terminal device to quickly identify and use appropriate resources based on which signal set experienced failure, simplifying the selection process despite having multiple resources available.
Solution Approach 2:
Certain random access resources are configured to serve multiple purposes - they can be used for both initial access and beam failure recovery across different signal sets. This multi-functionality reduces the total number of resources needed while maintaining comprehensive recovery capability.
Data Source
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AI summary
The embodiments of the disclosure provide a method for wireless communication and a device, which may select at least one of a random access sequence or a random access resource by use of quality of a signal in a second signal set when a link for a signal in a first signal set is too poor to be available. The method includes that: a terminal reports, in a first protocol layer, a first event to a second protocol layer, here, the first event is used to indicate that quality of a signal in a first signal set is poor enough to meet a first condition; and under the condition that the terminal determines, in the second protocol layer, occurrence of a second event based on an occurrence situation of the first event, the terminal determines, in the second protocol layer, at least one of a random access sequence or a random access resource for transmission based on a signal reporting situation provided by the first protocol layer about a second signal set, here, the random access sequence is a contention-based random access sequence or a contention-free random access sequence and the random access resource is a contention-based random access resource or a contention-free random access resource, and the second event is used to indicate that link quality corresponding to the signal in the first signal set is poor enough to meet a second condition.