Beam Failure Recovery Across Multiple TRPs
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, existing methods for beam failure detection and recovery are inadequate when dealing with multiple transmission/reception points (TRPs), as they rely on single procedures and resources, which can lead to inefficiencies in beam failure recovery and uplink grant requests.
Innovation Solution
A user equipment (UE) detects beam failures across multiple TRPs and applies a beam failure recovery (BFR) procedure using separate Physical Uplink Control Channel (PUCCH) resources, parameterized by a single set of variables, allowing for flexible selection of resources for scheduling requests based on received configurations, including periodicity and offset values, to ensure effective beam failure reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single BFR procedure and PUCCH resource are used for multiple TRPs, then device complexity is reduced, but beam failure recovery reliability deteriorates due to inability to distinguish between different TRP failures
Solution Approach 1:
The patent segments the BFR procedure into TRP-specific instances by introducing TRP identifier association with each PUCCH resource. Instead of a single unified procedure, each TRP has its own BFR procedure parameters (sr-ProhibitTimer, dsr-TransMax, SchedulingRequestId) that are independently managed, allowing the UE to distinguish and handle failures of different TRPs separately while maintaining manageable complexity through standardized parameter sets.
2Reliability
If separate BFR procedures are implemented for each TRP, then beam failure recovery reliability is improved, but device complexity increases due to multiple procedures and parameters
Solution Approach 1:
The patent implements universality by defining a common set of BFR parameters (sr-ProhibitTimer, dsr-TransMax, SchedulingRequestId, PUCCH resource configuration) that serves all TRPs. Each TRP's BFR procedure uses the same parameter definitions and follows the same procedural logic, allowing multiple TRP-specific procedures to be managed through a universal template rather than requiring entirely separate complex procedures for each TRP.
3Measurement precision
If multiple PUCCH resources with different configurations are used for different TRPs, then beam failure detection precision is improved, but ease of operation deteriorates due to complex resource selection requirements
Solution Approach 1:
The patent applies preliminary action by pre-configuring each PUCCH resource with its associated TRP identifier and BFR procedure parameters before beam failure detection occurs. The UE stores these pre-established mappings between PUCCH resources and TRPs, so when a beam failure is detected, the UE can immediately identify which TRP is affected and select the appropriate pre-configured PUCCH resource without needing to perform complex real-time analysis or selection algorithms.
Data Source
AI summary
A user equipment (UE) detects beam failure associated with a transmission/reception point (TRP) of a plurality of TRPs transmitting to the UE. Each TRP is associated with separate Physical Uplink Control Channel (PUCCH) resources for beam failure recovery (BFR). The UE applies, in response to detecting, a BFR procedure across PUCCH resources of the TRPs. In some aspects, the procedure is described by a single set of parameters/variable (s) across the PUCCH resources. Further, each of a plurality of TRPs transmits to a UE on a beam. A first of the TRPs receives, from the UE, a scheduling request (SR) in BFR PUCCH resources. The SR indicates that an uplink grant is requested by the UE to transmit beam failure information for at least one failed beam of the TRPs. The SR is a result of a single BFR procedure applied by the UE across the PUCCH resources of the TRPs.