Beam Failure Detection for Full-Duplex Self-Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively detecting beam failure due to self-interference in full-duplex operations, which can lead to reduced communication efficiency and reliability.
Innovation Solution
A user equipment (UE) is equipped to receive beam failure detection (BFD) reference signals in both full-duplex and half-duplex modes, allowing it to detect beam failure due to self-interference by comparing measurements across modes and switch to half-duplex mode when necessary, and transmit an indication of the cause of failure to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is used for simultaneous uplink and downlink communication, then communication efficiency and spectral utilization are improved, but self-interference causes beam failure detection difficulties and reduces reliability
Solution Approach 1:
The patent segments the beam failure detection process into two distinct modes: full-duplex BFD (for detecting beam failure caused by self-interference) and half-duplex BFD (for detecting beam failure caused by other factors). This segmentation allows the system to differentiate between self-interference-induced beam failure and other types of beam failure, enabling more reliable detection and appropriate recovery actions in full-duplex operation
Solution Approach 2:
The patent introduces an intermediary mechanism that compares measurements from both full-duplex and half-duplex BFD reference signals. By using the half-duplex BFD measurements as a reference baseline, the system can identify when beam failure is specifically caused by self-interference in full-duplex mode, thereby improving detection reliability without sacrificing communication efficiency
2Duration of action of stationary object
If beam failure detection is performed in full-duplex mode, then communication continuity is maintained, but self-interference leads to inaccurate failure detection and reduced measurement precision
Solution Approach 1:
The patent uses half-duplex BFD reference signal measurements as an intermediary reference to improve the precision of beam failure detection in full-duplex mode. By comparing full-duplex measurements against the half-duplex baseline, the system can filter out the self-interference component and achieve more accurate detection of actual beam failure conditions
Solution Approach 2:
The patent changes the operational parameter of the BFD reference signal from a single mode to dual modes (full-duplex and half-duplex). This parameter change enables the system to capture different interference conditions and use the differential information to improve measurement precision in identifying true beam failure events versus self-interference artifacts
Data Source
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.