Beam Failure Recovery PRACH Mapping for Ambiguous Beam Selection
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Solution Overview
Problem
Existing wireless communication systems face ambiguity in beam management and inefficiencies in beam use due to the lack of clear association between PRACH resources and SS blocks, particularly when both SSB and CSI-RS have quality equal to or greater than a threshold.
Innovation Solution
A method is provided to associate two PRACH resources with an SS block (SSB) and configure priorities when both SSB and channel state information (CSI)-reference signal (RS) have quality equal to or greater than a threshold, enhancing beam management and utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one PRACH resource is associated with an SSB, then the association is simple, but beam management ambiguity occurs when multiple beams have equal quality
Solution Approach 1:
The patent segments the single PRACH resource association into multiple PRACH resources (first and second PRACH resources) that can be separately associated with the same SSB. This segmentation allows the system to distinguish between different beam scenarios (single beam vs. multiple equal-quality beams) by selecting different PRACH resources, thereby resolving the ambiguity in beam management while maintaining a relatively simple association structure through configurable priorities.
2Reliability
If priority configuration is added to resolve beam ambiguity, then beam management clarity improves, but system complexity increases
Solution Approach 1:
The patent applies local quality by assigning different priorities to different PRACH resources associated with the same SSB. Specifically, when multiple beams have equal quality, the first PRACH resource is configured with a first priority and the second PRACH resource with a second priority. This local differentiation in priority configuration enables precise beam selection without requiring complex global reconfiguration, thus improving beam selection accuracy while limiting the increase in system complexity to localized priority settings.
Data Source
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AI summary
Disclosed is a method of performing a beam failure recovery in a wireless communication system. The beam failure recovery method performed by a user equipment includes detecting a beam failure, identifying a new beam for the beam failure recovery, and transmitting a beam failure recovery request to a base station using a PRACH resource. The PRACH resource includes a first PRACH resource and a second PRACH resource. The first PRACH resource and the second PRACH resource are associated with a SS block (SSB). If the SSB is identified as the new beam, the beam failure recovery request is transmitted using the first PRACH resource. If a channel state information (CSI)-reference signal (RS) resource is identified as the new beam, the beam failure recovery request is transmitted using the second PRACH resource.