Secondary Cell Beam Failure Reporting via Target Serving Cell
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Solution Overview
Problem
Current communication protocols do not provide a method for reporting and recovering beam failures in secondary cells (SCells) of user equipment (UE), whereas they do address this issue for primary cells (PCells).
Innovation Solution
A method and device for reporting a beam failure in a SCell, which involves determining that a SCell has a beam failure, selecting a target serving cell to transmit a report message to the base station, and transmitting the report message in the target serving cell. The target serving cell can be a PCell, a PScell, or another serving cell configured with PUCCH/PUSCH/PRACH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure reporting is implemented for SCell, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses an intermediary cell (either PCell or another SCell with available uplink resources) to transmit beam failure reporting information when the affected SCell lacks uplink resources. This mediator approach allows indirect reporting without requiring direct uplink capability in the failed cell, resolving the contradiction between ensuring reliable reporting and avoiding complex resource allocation mechanisms.
Solution Approach 2:
The patent enables any serving cell with available uplink resources (PUCCH/PUSCH/PRACH) to serve as a reporting channel for beam failure detection in other cells. This multi-functional approach allows the same uplink resources to serve both data transmission and beam failure reporting purposes, improving reliability without adding dedicated reporting infrastructure.
2Reliability
If beam failure reporting is implemented for SCell, then communication quality is maintained, but protocol complexity increases
Solution Approach 1:
The patent implements self-service by allowing the UE to autonomously determine whether uplink resources are available in the affected SCell and automatically select an alternative reporting cell when needed. This self-decision mechanism eliminates the need for complex base station-controlled resource allocation and signaling, maintaining communication quality while keeping protocol complexity manageable.
Solution Approach 2:
The patent establishes a feedback loop where the base station configures SCell measurement and reporting parameters, the UE monitors beam quality and detects failures, and the UE reports back through available uplink channels. This feedback mechanism ensures communication quality is maintained through continuous monitoring and reporting, while the configuration-based approach keeps protocol complexity controlled.
Data Source
AI summary
A method for reporting a beam failure of a secondary cell (SCell) includes: determining, by user equipment (UE), that a first SCell has a beam failure; determining a target serving cell for transmitting a report message to a base station, the report message being configured to notify the base station that the first SCell has the beam failure; and transmitting the report message in the target serving cell.