Default Uplink Beam Failure Reporting in 5G NR
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR technology, there is a challenge in identifying and responding to beam failures of default uplink beams, as these beams lack configured spatial relations, making it difficult for base stations to determine the failed beam.
Innovation Solution
The solution involves enabling User Equipment (UE) to indicate a default beam in a beam failure report to the base station, using reserved uplink beam indication IDs, specific bit patterns, or the absence of an uplink beam ID, allowing the base station to interpret the report and identify the default uplink beam as failed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station uses conventional beam failure detection methods, then the detection process is simple, but the base station cannot identify the failed beam when it is a default uplink beam
Solution Approach 1:
The patent introduces an intermediary mechanism (beam failure report with reserved uplink beam indication ID) that mediates between the UE and base station to convey information about default uplink beam failures. This report structure serves as a mediator that enables the base station to identify failed default beams without requiring complex detection procedures, thus resolving the contradiction between identification accuracy and mechanism complexity.
2Loss of information
If the UE reports beam failure without indicating the beam type, then the report structure is simple, but the base station cannot determine whether the failed beam is a default uplink beam
Solution Approach 1:
The patent applies parameter changes by introducing a reserved uplink beam indication ID as a specific parameter in the beam failure report. This parameter change enables the report to convey beam type information (specifically that the failed beam is a default uplink beam) without fundamentally changing the report structure. The reserved ID acts as an information carrier that adds necessary identification capability while maintaining report simplicity.
3Reliability
If the base station implements comprehensive beam failure detection for all beam types, then beam failure identification is accurate, but the processing complexity increases
Solution Approach 1:
The patent segments the beam failure detection process into distinct handling mechanisms for different beam types. By segmenting the detection and reporting process, the base station can reliably identify default uplink beam failures through the specialized beam failure report with reserved indication ID, while maintaining simpler processing for other beam types. This segmentation enables comprehensive detection reliability without uniformly increasing processing complexity across all beam types.
Data Source
AI summary
A user equipment (UE) determines a beam failure of a default uplink beam for the UE. The UE transmits an uplink beam failure report in response to determining the beam failure of the default uplink beam, the uplink beam failure report indicating that a reported beam is the default uplink beam for the UE. A base station receives an uplink beam failure report from the UE and determines that a reported beam is a default uplink beam for the UE.