Beam Failure Recovery via Multi-TRP Scheduling Requests
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively managing beam failures across multiple transmission-reception points (TRPs) in wireless networks, particularly in transmitting scheduling requests (SRs) during beam failure recovery (BFR) processes, which can lead to service disruptions and reduced network efficiency.
Innovation Solution
The implementation of an apparatus and method that allows user equipment (UE) to detect beam failures at multiple TRPs and transmit SRs via different SR physical uplink control channel (PUCCH) resources with spatial relations configured for beam failure recovery, enabling efficient recovery mechanisms even when uplink grants are not available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits SR via a single PUCCH resource when beam failure is detected at one TRP, then the BFR process can be initiated, but if beam failure occurs at additional TRPs, the system cannot efficiently request uplink resources for further recovery
Solution Approach 1:
The patent segments the SR transmission capability by configuring multiple PUCCH resources (first SR PUCCH resource and second SR PUCCH resource) corresponding to different TRPs. Each PUCCH resource can be independently used to transmit SR for BFR when beam failure occurs at the associated TRP, enabling parallel recovery paths for multiple TRP failures.
Solution Approach 2:
The patent adds a spatial dimension to SR transmission by associating different PUCCH resources with different spatial relations (different TRPs). This allows the UE to transmit SR on different spatial paths simultaneously or sequentially, providing dimensionality in the recovery process that enables handling of multi-TRP beam failures.
2Adaptability or versatility
If the system configures multiple SR PUCCH resources for different TRPs, then multi-TRP beam failure recovery is enabled, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent makes the SR PUCCH resources universal by configuring them to serve dual purposes: the first SR PUCCH resource handles BFR for first TRP failures, and the same or different resources can handle BFR for second TRP failures. This multi-functionality reduces the need for entirely separate resource sets while maintaining multi-TRP recovery capability.
Solution Approach 2:
The patent performs preliminary configuration of multiple SR PUCCH resources and their associated spatial relations before beam failures occur. This advance preparation ensures that when multi-TRP beam failures happen, the UE can immediately use the pre-configured resources without complex real-time decisions, reducing operational complexity during actual failure scenarios.
3Productivity
If the UE waits for uplink grants before transmitting BFR information, then resource allocation is optimized, but service disruptions increase during beam failure recovery
Solution Approach 1:
The patent performs preliminary configuration of SR PUCCH resources and spatial relations before beam failures occur. This advance preparation eliminates the need for real-time resource allocation decisions during failure scenarios, allowing immediate SR transmission upon detecting beam failure at any TRP, thus reducing service disruption while maintaining efficient resource use.
Solution Approach 2:
The patent introduces SR PUCCH resources as an intermediary mechanism that enables direct transmission of BFR information without requiring immediate uplink grants. This intermediary channel allows the UE to quickly notify the network of beam failures and initiate recovery, bridging the gap between immediate recovery needs and scheduled resource allocation.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may detect a beam failure at a first transmission-reception point (TRP) associated with a serving cell. The UE may transmit, to a base station via a second TRP, a scheduling request (SR) for a beam failure recovery (BFR) via a first SR physical uplink control channel (PUCCH) resource. The UE may detect a beam failure at a second TRP associated with the serving cell or another serving cell. The UE may transmit, to the base station, the SR via a second SR PUCCH resource with a spatial relation configured for the SR. Numerous other aspects are described.