Beam Failure Recovery in Multi-TRP Systems
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Solution Overview
Problem
Current beam failure recovery mechanisms in multi-TRP transmission systems are inadequate, as they only trigger recovery when all beams from all TRPs fail, leading to decreased performance, especially with non-ideal backhaul conditions, and cannot recognize or recover from beam failures in individual TRPs.
Innovation Solution
The method involves transmitting configuration information indicating sets of failure detection and candidate resources, allowing User Equipment (UE) to detect beam failures and trigger recovery for specific TRPs by selecting and reporting candidate beams, enabling beam failure recovery even if only some TRPs' beams have failed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery is triggered only when all beams from all TRPs fail, then system complexity is reduced, but reliability and robustness deteriorate because individual TRP failures cannot be recovered
Solution Approach 1:
The patent segments the beam failure recovery mechanism by TRP, allowing independent detection and recovery for each TRP. The network device configures separate failure detection resources and candidate beam resources for each TRP, enabling granular recovery actions targeted at specific failed TRPs rather than requiring system-wide failure before recovery can initiate.
Solution Approach 2:
The network device performs preliminary configuration of failure detection resources and candidate beam resources for each TRP before actual beam failure occurs. This pre-configuration enables immediate recovery action when a TRP beam fails, without requiring complex real-time decision-making about which TRP to recover.
2Reliability
If separate failure detection is implemented for each TRP, then reliability improves through individual TRP recovery, but device complexity increases due to multiple configuration sets
Solution Approach 1:
The configuration is segmented into TRP-specific failure detection resource sets and candidate beam resource sets. Each TRP has its own configured resources, allowing independent monitoring and recovery. This segmentation enables the system to track the status of each TRP separately and trigger recovery only for the specific TRP that experiences beam failure.
Solution Approach 2:
The system configures resources for all TRPs in advance (excessive configuration), but only activates and uses the resources corresponding to the specific TRP that experiences beam failure (partial action). This approach maintains simplicity by having pre-configured resources available without requiring complex real-time resource allocation decisions.
3Measurement precision
If beam failure detection uses multiple failure detection resources per TRP, then detection precision improves, but loss of time increases due to monitoring multiple resources
Solution Approach 1:
Failure detection resources are segmented and assigned to individual TRPs. The UE monitors failure detection resources specifically configured for each TRP independently, allowing precise detection of beam failure status per TRP without the time penalty of evaluating all resources across all TRPs. This segmentation enables parallel monitoring of multiple TRPs simultaneously.
Solution Approach 2:
The network device preliminarily configures the set of failure detection resources for each TRP before beam failure occurs. This pre-configuration allows the UE to immediately start monitoring the appropriate resources when a TRP is assigned, reducing detection time compared to having to identify and configure resources after failure is detected.
Data Source
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AI summary
Methods and apparatuses for beam failure recovery. According to an embodiment of the present disclosure, a method can include: transmitting configuration information indicating at least one set of failure detection resources and at least one set of candidate resources, wherein respective one of the at least one set of failure detection resources is associated with respective one of the at least one set of the candidate resources; and receiving a physical random access channel resource, wherein the physical random access channel resource is associated with one candidate resource in one of the at least one set of candidate resources. The method of beam failure recovery in multi-TRP transmission will increase the robustness of beams in a communication network.