Beam Failure Recovery Using Recommended Beam Reporting
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Solution Overview
Problem
Existing beam failure recovery methods have a low success rate due to channel fluctuations and misalignment between user equipment (UE) and network beams, leading to wireless link failures and increased latency.
Innovation Solution
A method and device for beam failure recovery that involves determining signal quality of designated beams, performing beam measurements to identify recommended beams with suitable signal quality, and reporting their identifications to the network to enable beam switching, using encoding, modulation, and signal sequence transmission to improve recovery success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing beam failure recovery methods are used, then the recovery process can be initiated, but the success rate is low due to channel fluctuations and beam misalignment
Solution Approach 1:
The terminal performs beam measurements on multiple candidate beams in advance and prepares a list of recommended beams with their identifiers before beam failure occurs. When beam failure is detected, the terminal can immediately report the pre-prepared recommended beam list to the network, eliminating the need for time-consuming measurement and selection processes during recovery, thus reducing recovery latency while improving success rate through pre-identified suitable beams
Solution Approach 2:
The terminal continuously monitors beam quality metrics (such as RSRP) and provides feedback to the network about the quality of candidate beams. This feedback mechanism allows the network to make informed decisions about beam switching based on real-time channel conditions, improving the reliability of beam failure recovery by selecting beams that are actually suitable for the current channel state rather than relying on predetermined beam configurations
2Measurement precision
If beam measurements are performed to identify recommended beams, then the recovery accuracy improves, but the calculation complexity and processing time increase
Solution Approach 1:
The terminal extracts only the essential information needed for beam identification and reporting, such as beam identifiers (CRI, TCI states) and key quality metrics (RSRP thresholds). By extracting only the necessary elements rather than processing complete beam measurement data, the system achieves accurate beam quality assessment while reducing computational complexity and processing time
Solution Approach 2:
The system changes the parameter representation from detailed measurement data to simplified beam identifiers and threshold-based quality indicators. By transforming complex measurement parameters into discrete beam IDs and comparing against predefined RSRP thresholds, the system maintains measurement precision for beam selection while significantly reducing the computational burden of processing continuous measurement values
3Adaptability or versatility
If multiple recommended beams are reported to the network, then the network has more flexibility for beam selection, but the information transmission overhead increases
Solution Approach 1:
The terminal reports a limited number of top recommended beams (e.g., top 1-3 beams) rather than all measured candidate beams. This partial reporting approach provides the network with sufficient flexibility to select from multiple quality options while avoiding the excessive information overhead of reporting all possible candidate beams, achieving an optimal balance between network adaptability and transmission efficiency
Data Source
AI summary
A method and a device for beam failure recovery are provided. The method includes determining signal quality of a designated beam being out of a required range of control channel transmission, where the designated beam is designated by a network for control channel transmission; performing a beam measurement to determine a plurality of recommended beams, where signal quality of the plurality of recommended beams is within a preset range; and reporting beam identifications of the plurality of recommended beams to the network, so that the network can change the designated beam based on the plurality of recommended beams. The method and device can increase a success rate of beam failure recovery.