Beam Failure Recovery Aborting via Time Alignment Timer Expiry
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing beamforming and resource allocation across multiple carriers, leading to suboptimal performance and increased complexity.
Innovation Solution
The implementation of advanced beam management techniques and multi-connectivity strategies in 5G networks, allowing for dynamic allocation of resources and adaptive beamforming across multiple carriers and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery procedures are implemented in multicarrier communication systems, then beam alignment and communication reliability are improved, but system complexity and resource management overhead increase
Solution Approach 1:
The system pre-configures multiple candidate beams and recovery procedures before beam failure occurs. The UE is provided with a set of candidate beams and corresponding time alignment timers in advance, enabling rapid recovery without complex real-time decision-making when failure occurs.
Solution Approach 2:
The UE autonomously monitors beam quality, detects failures, and executes recovery procedures using pre-configured parameters. The device self-manages the beam failure recovery process by independently evaluating candidate beams and selecting appropriate recovery actions without continuous network control.
2Reliability
If multiple candidate beams are configured for beam failure recovery, then recovery options and reliability are improved, but resource allocation complexity and overhead increase
Solution Approach 1:
The candidate beams are organized into distinct groups or sets, each associated with specific time alignment timers. This segmentation allows the system to manage multiple beams systematically by dividing them into manageable groups rather than handling all beams uniformly.
Solution Approach 2:
Different time alignment timer values are assigned to different candidate beam groups. By varying the timer parameters across different beam groups, the system enables differentiated resource management and priority handling without increasing overall structural complexity.
3Productivity
If time alignment timers are used to manage beam failure recovery, then resource efficiency and spectral efficiency are improved, but timing synchronization complexity increases
Solution Approach 1:
Time alignment timers are used to periodically reset or refresh the uplink timing for different candidate beams. This periodic timing mechanism ensures that timing synchronization is maintained automatically through regular intervals, reducing the need for complex continuous synchronization protocols.
Data Source
AI summary
A wireless device initiates a beam failure recovery procedure based on a beam failure of at least one beam of a cell. A radio link failure is determined based on a failure of the beam failure recovery procedure. A radio link failure report is transmitted. The radio link failure report comprises: a first field indicating that the failure of the beam failure recovery procedure is a cause of the radio link failure; and a second field indicating a random access resource for the beam failure recovery procedure.