Secondary Cell Beam Failure Reporting via MAC CE Signaling
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Solution Overview
Problem
Current communication standards in 5G NR systems only define beam failure reporting and recovery processes for primary cells, failing to address beam failures in secondary serving cells, which can occur due to terminal movement or base station antenna direction changes.
Innovation Solution
A method and device for a terminal to determine and report beam failures in secondary serving cells by transmitting medium access control (MAC) control elements to a base station, including target beam indication information for restoring the beam failure, selecting candidate beams with signal quality above a preset threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If beam failure reporting is only defined for primary cells, then the system complexity is reduced, but the communication reliability deteriorates when beam failures occur in secondary serving cells
Solution Approach 1:
The patent extends the beam failure reporting mechanism from primary cells to secondary serving cells, making the system universally applicable to all cell types. The terminal device now can report beam failures for any secondary serving cell using the same MAC CE signaling mechanism, thus improving reliability without significantly increasing system complexity.
2Productivity
If the terminal transmits MAC CE signaling with target beam indication information, then the beam failure recovery efficiency is improved, but the signaling overhead increases
Solution Approach 1:
The patent combines the beam failure indication and the target beam identification into a single MAC CE signaling transmission. The terminal device reports both the occurrence of beam failure and the identified target beam for recovery in one unified signaling message, reducing the number of separate signaling exchanges and improving recovery efficiency while controlling overhead.
Data Source
AI summary
A method, a device and a storage medium for reporting a beam failure. The method includes: determining, by a terminal, that a target secondary serving cell among n accessed secondary serving cells has a beam failure, where n is a positive integer; and transmitting, by the terminal, a first medium access control (MAC) control element (CE) signaling to a base station, the first MAC CE signaling including beam failure indication information for indicating that the target secondary serving cell has the beam failure.