Full Duplex Beam Failure Detection Using L1-SINR
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in detecting and recovering from beam failures due to self-interference and link degradation in full duplex communication, which affect the quality of downlink and uplink beams.
Innovation Solution
A method and apparatus for a user equipment (UE) to detect beam failures by measuring layer 1 signal to interference and noise ratio (L1-SINR) for active downlink and uplink beam pairs and transmit a beam failure recovery request (BFRQ) to a base station using uplink resources, enabling the UE to switch to a new beam direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is used to improve spectral efficiency, then communication capacity is improved, but self-interference occurs which degrades beam quality
Solution Approach 1:
The patent introduces an intermediary mechanism (beam failure detection and recovery request system) that mediates between the harmful self-interference and the communication quality. When self-interference degrades beam quality below a threshold, the system automatically triggers beam failure recovery procedures to switch to alternative beams, thus protecting communication quality while maintaining full duplex operation.
2Reliability
If beam failure detection is implemented to improve communication reliability, then beam quality is maintained, but system complexity increases
Solution Approach 1:
The beam failure detection system operates autonomously at the user equipment, continuously monitoring beam quality metrics and automatically initiating recovery procedures when failures are detected. This self-service approach maintains communication reliability without requiring constant network intervention, thereby limiting the increase in system complexity to localized automated functions rather than centralized complex control.
3Reliability
If rapid beam failure recovery is implemented to improve communication continuity, then service interruption is reduced, but processing time is increased
Solution Approach 1:
The system performs preliminary actions by pre-configuring multiple beam pairs and establishing quality thresholds before actual communication occurs. When beam failure is detected, the recovery process can quickly switch to pre-identified alternative beams without extensive real-time analysis, thus maintaining communication continuity while minimizing the actual processing time required during failure events.
Data Source
AI summary
When a beam failure is detected, appropriate actions may be taken to recover the connection. A beam failure recovery request may be sent by a user equipment (UE) apparatus to initiate the recovery of the connection. The UE detects a beam failure for at least one active downlink and uplink beam pair for full duplex communication with a secondary cell (SCell). The UE transmits a beam failure recovery request (BFRQ) for the SCell to a base station using an uplink resource of the SCell or a primary cell (PCell) based on a layer 1 signal to interference and noise ratio (L1-SINR) measurement for the at least one active downlink and uplink beam pair of the SCell.