SCell Beam Failure Recovery Using BFRQ and SR Transmission Limits
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Solution Overview
Problem
In high-band communications systems like 5G, beam failure recovery (BFR) is not supported in secondary cells (SCells) due to undefined mechanisms for transmitting beam failure recovery request (BFRQ) messages.
Innovation Solution
A method and terminal implementation to trigger BFRQ information and scheduling requests (SRs) for BFRQ upon beam failure in SCells, with conditions to restrict, allow, or reset counter operations to manage excessive transmissions and support BFR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BFRQ transmission is allowed without restrictions in SCell beam failure scenarios, then beam failure recovery capability is improved, but excessive transmissions occur causing resource wastage
Solution Approach 1:
The patent applies parameter changes by introducing a BFI counter that tracks beam failure instances and uses threshold-based parameter adjustment. When the BFI counter reaches a predetermined threshold, the terminal switches from allowing BFRQ transmission to forbidding it, dynamically changing the transmission parameter based on the measured failure frequency to prevent resource wastage while maintaining recovery capability.
Solution Approach 2:
The patent implements feedback mechanisms through the BFI counter that continuously monitors beam failure occurrences and provides feedback to control BFRQ transmission. The counter increments with each beam failure instance and triggers transmission permission changes based on accumulated failure data, creating a closed-loop feedback system that adapts transmission behavior to actual channel conditions.
2Loss of energy
If BFRQ transmission is restricted to prevent excessive transmissions, then resource efficiency is improved, but beam failure recovery responsiveness deteriorates
Solution Approach 1:
The patent applies partial action by allowing BFRQ transmission only when the BFI counter is below the threshold, rather than continuously. This partial permission approach enables timely recovery when failures are occasional while preventing resource wastage when failures are frequent, achieving a balance between responsiveness and efficiency through conditional transmission authorization.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the BFI counter threshold before beam failure occurs. This predetermined threshold is established in advance to guide transmission decisions, allowing the system to quickly determine whether to permit BFRQ transmission without complex real-time analysis, thus maintaining responsive recovery while conserving resources.
3Reliability
If beam failure recovery is supported in SCell, then communication reliability is improved, but system complexity increases due to undefined BFRQ transmission mechanisms
Solution Approach 1:
The patent applies universality by extending the BFR mechanism from PCell to SCell, making the beam failure recovery capability universal across different cell types. The same BFI counter and threshold-based control mechanism used in PCell is applied to SCell, allowing a single unified system to handle beam failure recovery in both primary and secondary cells without requiring separate complex mechanisms.
Solution Approach 2:
The patent uses parameter changes to simplify the system by introducing the BFI counter threshold parameter that automatically controls BFRQ transmission behavior in SCell. This single parameter change enables the system to adapt transmission permissions based on failure frequency, providing a simple yet effective mechanism that reduces complexity compared to designing entirely new SCell-specific recovery procedures.
Data Source
AI summary
Embodiments of this disclosure provide a beam failure handling method and a terminal. The method includes: triggering transmission of at least one of BFRQ information and a scheduling request SR for BFRQ if a beam failure occurs in an SCell, where the terminal has at least one of the following features related to the SCell: if a first condition is met, triggering transmission of at least one of subsequent BFRQ information and subsequent SRs for BFRQ is forbidden; triggering transmission of at least one SR for BFRQ is allowed; and triggering transmission of BFRQ information is restricted to one time; if a second condition is met, a BFI counter skips or stops counting; and if a third condition is met, a BFI counter is reset.