Random Access Resource Selection for Beam Failure Recovery
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Solution Overview
Problem
Current CBRA procedures in wireless communication networks face challenges in determining the reason for contention-based random access, leading to unnecessary reconfigurations and potential loss of network connectivity due to misinterpretation of beam failure recovery requests.
Innovation Solution
The solution involves prioritizing random access resource selection based on reference signals with power and quality thresholds, ensuring that beams configured for PDCCH reception are preferred over others, and inhibiting beam reconfiguration when the received preamble is on a beam associated with PDCCH, thereby improving network determination of CBRA reasons and reducing unnecessary reconfigurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CBRA is performed without distinguishing the reason, then the procedure can be executed, but unnecessary reconfigurations occur and network connectivity may be lost due to misinterpretation
Solution Approach 1:
The patent segments the CBRA procedure by introducing distinct resource selection methods for different access purposes. UEs select PRACH resources based on the specific reason for access (beam failure recovery vs. other purposes), allowing the network to distinguish between these cases and apply appropriate handling, thereby avoiding unnecessary reconfigurations while maintaining reliable connectivity.
2Reliability
If beam reconfiguration is performed for all CBRA cases, then connectivity is maintained, but unnecessary reconfigurations increase overhead and complexity
Solution Approach 1:
The patent extracts the beam failure recovery indication from the general CBRA procedure by using dedicated PRACH resources specifically allocated for beam failure recovery. This separation allows the network to identify beam failure recovery cases and apply reconfiguration only when necessary, eliminating unnecessary reconfiguration overhead while maintaining connectivity reliability.
3Loss of information
If PRACH resources are not differentiated by purpose, then resource allocation is simple, but the network cannot determine the reason for CBRA
Solution Approach 1:
The patent applies local quality by assigning different properties to different PRACH resources based on their intended purpose. Specific PRACH resources are designated for beam failure recovery while others are for general access. This differentiation provides the network with information about the CBRA reason without requiring complex signaling, as the resource selection itself carries the indication.
Data Source
AI summary
It is provided a method, comprising checking if a contention based random access is to be performed for a reason different from a beam failure recovery; monitoring if a received first reference signal has a received power above a set power threshold and/or a received quality above a set quality threshold; checking if a reception device is configured to receive a downlink control signal on a first beam corresponding to the first reference signal; instructing a transmission device to transmit a preamble of the contention based random access on the first beam if the contention based random access is to be performed for the reason, the received first reference signal has the received power above the set power threshold and/or the received quality above the set quality threshold, and the reception device is configured to receive the downlink control signal on the first beam.