Beam Failure Detection Under Full-Duplex Self-Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam failure detection and recovery in full-duplex operations due to self-interference, which affects communication quality and reliability.
Innovation Solution
Implementing beam failure detection (BFD) and beam failure recovery (BFR) mechanisms in full-duplex mode by using BFD reference signals and switching to half-duplex mode when self-interference is detected, along with mechanisms for candidate beam detection and recovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection is performed during full-duplex operation, then uplink coverage is improved, but self-interference from simultaneous downlink transmission degrades detection accuracy
Solution Approach 1:
The patent extracts the harmful self-interference component from the received signal by separately receiving downlink reference signals during full-duplex operation. The UE isolates the interference from the gNB's simultaneous downlink transmission and removes it from the uplink signal, enabling clean beam failure detection without contamination from self-interference
Solution Approach 2:
The patent introduces downlink reference signals as an intermediary element. These reference signals serve as a mediator to characterize and quantify the self-interference channel, allowing the UE to model and compensate for the interference affecting uplink beam failure detection
2Productivity
If beam failure detection is performed during full-duplex operation, then system resource utilization is improved, but detection accuracy degrades due to self-interference
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures downlink reference signals to characterize the self-interference channel, then uses this feedback information to compensate for interference in subsequent uplink beam failure detection. This closed-loop approach maintains detection accuracy while enabling continuous full-duplex operation
Solution Approach 2:
The patent converts the harmful self-interference into a beneficial measurement opportunity. By intentionally receiving downlink reference signals during full-duplex operation, the UE transforms the interference into useful channel state information that enables accurate beam failure detection through interference characterization and compensation
3Loss of information
If downlink reference signals are received during full-duplex operation, then self-interference characterization is improved, but signal processing complexity increases
Solution Approach 1:
The patent performs preliminary characterization of the self-interference channel by receiving and measuring downlink reference signals before they interfere with uplink beam failure detection. This advance preparation allows the UE to pre-compute interference compensation parameters, reducing the processing burden during critical detection moments
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a beam failure detection (BFD) reference signal set in one or more slots in a full-duplex mode and in one or more slots in a half-duplex mode. The UE may detect beam failure due to self-interference based at least in part on a comparison of measurements of the BFD reference signal set in the full-duplex mode and half-duplex mode. The UE may switch from the full-duplex mode to the half-duplex mode for slots configured for the full-duplex mode based at least in part on detecting beam failure due to self-interference. Numerous other aspects are described.