Beam Failure Recovery Using Multi-TRP Partial Link Restoration
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Solution Overview
Problem
In high-frequency communication, signal energy decreases sharply with distance, leading to short transmission distances and beam failures due to obstacles, and existing beam failure recovery methods are inadequate for multi-TRP scenarios.
Innovation Solution
A method for beam failure recovery that enables both TRP-level and cell-level recovery, using N sets of beam failure detection and candidate resources, allowing for partial and timely recovery, and includes mechanisms for reporting beam quality and relationships to improve system performance and continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If analog beam technology is used to concentrate signal energy, then transmission distance is improved, but beam failure occurs easily due to narrow coverage area and obstacles
Solution Approach 1:
The patent segments the beam failure recovery process into multiple independent recovery indication information messages, each corresponding to different TRPs. This allows the terminal to report beam failure status for each TRP separately, enabling granular recovery actions that maintain reliability while preserving the long transmission distance advantage of analog beams.
Solution Approach 2:
The patent introduces a new parameter dimension by configuring multiple sets of beam failure detection resources (N sets) with different parameters such as reference signal resources, frequency locations, and time resources. This enables the system to detect and recover from beam failures across multiple parameters, improving reliability without sacrificing transmission distance.
2Reliability
If cell-level beam failure recovery is implemented, then recovery coverage is comprehensive, but service delays increase due to waiting for complete cell recovery
Solution Approach 1:
The patent segments cell-level beam failure recovery into multiple TRP-level recovery processes. Each TRP can be recovered independently and reported separately through dedicated recovery indication information. This allows the network to restore service progressively as each TRP recovers, reducing overall service delay while maintaining comprehensive recovery coverage.
Solution Approach 2:
The patent enables partial recovery by allowing the terminal to report recovery status for individual TRPs rather than requiring complete cell-level recovery. The network can accept and act on partial recovery information, enabling service restoration before all TRPs are fully recovered, thus reducing service delays.
3Measurement precision
If N sets of beam failure detection resources are configured per TRP, then TRP-level recovery precision is improved, but device complexity increases
Solution Approach 1:
The patent designs the N sets of beam failure detection resources with a universal structure that can be applied across multiple TRPs. Each set follows the same configuration pattern (reference signal resources, frequency, time resources), allowing the system to maintain high detection precision while reducing configuration complexity through reuse of the same resource structure.
Solution Approach 2:
The patent applies local quality by configuring beam failure detection resources with specific local characteristics for each TRP (different reference signal resources, frequency locations, time resources) while maintaining a unified overall structure. This enables precise local detection for each TRP without requiring completely separate complex configurations.
Data Source
AI summary
This application provides a beam failure recovery method, an apparatus, and a system. In this solution, a terminal device receives first configuration information from a network device, and performs cell-level beam failure recovery or transmission reception point level (TRP-level) beam failure recovery based on the first configuration information. The first configuration information is used to configure a plurality of sets of beam failure detection resources and a plurality of sets of candidate beam resources. Based on this solution, the terminal device may perform partial beam failure recovery based on the plurality of sets of beam failure detection resources and the plurality of sets of candidate beam resources, so that the terminal device can detect a TRP-level beam failure and recover the TRP-level beam failure in time. This effectively improves smooth system evolution.