Contention-Free Random Access Failure Reporting in Distributed RAN
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Solution Overview
Problem
Existing wireless networks face challenges in managing contention free random access failures, particularly in secondary cell synchronization and handover processes, which can lead to inefficiencies and disruptions in communication.
Innovation Solution
A distributed radio access network entity configures random access resources and preambles for wireless devices, allowing for contention-free access, and detects the presence of preambles to determine and report failures, facilitating secondary cell synchronization and handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention free random access is used for secondary cell synchronization and handover, then access efficiency is improved, but failure detection and management becomes more difficult
Solution Approach 1:
The patent implements a feedback mechanism where the distributed RAN entity sends a RA failure indication to the central RAN entity when preamble detection fails. This feedback loop enables the system to detect and report contention-free random access failures, allowing for proper failure management while maintaining the efficiency benefits of contention-free access.
2Reliability
If distributed RAN entity detects and reports RA failures, then failure management is improved, but network complexity increases
Solution Approach 1:
The patent segments the RAN into distributed and central entities, with specific failure detection and reporting functions assigned to the distributed entity. This segmentation allows for specialized failure management capabilities while distributing the complexity across multiple entities rather than concentrating it in a single complex system.
Data Source
AI summary
Systems, apparatuses, and methods are described for random access of a wireless device. A distributed unit (e.g., of a radio access network (RAN) entity) may send an indication of a random access (RA) resource of a cell for a wireless device. The distributed unit may send, to a central unit, an RA failure indication associated with the wireless device, for example, if the distributed unit does not detect an RA preamble on the RA resource from a wireless device.