Mitigating BFD-RS Non-Transmission via LBT Failure Handling
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Solution Overview
Problem
Wireless communication systems face challenges in detecting beam failure due to listen-before-talk (LBT) failures, leading to non-transmission of periodic beam failure detection reference signals (BFD-RS), which can result in unnecessary beam failure recovery procedures and interference with other transmitters.
Innovation Solution
The system configures periodic BFD-RS with multiple transmission opportunities and associates them with aperiodic BFD-RS, allowing the base station to transmit during successful LBT opportunities and exempting certain transmissions from LBT requirements, while the user equipment (UE) adjusts beam quality measurements to avoid false beam failure declarations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the base station performs listen-before-talk (LBT) procedure before transmitting periodic BFD-RS, then interference with other transmitters is reduced, but beam failure detection may be missed due to non-transmission
Solution Approach 1:
The base station performs LBT procedure in advance before each periodic BFD-RS transmission opportunity. This preliminary channel access check ensures that the BFD-RS is only transmitted when the channel is clear, preventing interference with other transmitters while maintaining reliable beam failure detection through configured fallback mechanisms
Solution Approach 2:
The system configures multiple transmission opportunities for periodic BFD-RS within each periodicity. This creates a buffer or cushion where if LBT fails for one opportunity, subsequent opportunities within the same period can still transmit BFD-RS, ensuring detection reliability is maintained despite individual LBT failures
2Reliability
If the base station transmits periodic BFD-RS without LBT exemption, then beam failure detection is reliable, but unnecessary beam failure recovery procedures are triggered due to LBT failures
Solution Approach 1:
The base station performs LBT procedure in advance before each periodic BFD-RS transmission opportunity. This preliminary channel access check ensures that the BFD-RS is only transmitted when the channel is clear, preventing interference with other transmitters while maintaining reliable beam failure detection through configured fallback mechanisms
Solution Approach 2:
The system dynamically adapts the BFD-RS transmission strategy by configuring multiple transmission opportunities per periodicity and allowing selective LBT exemptions. This dynamic approach enables the system to adjust to channel conditions, transmitting BFD-RS when possible while avoiding unnecessary failures when LBT fails, thus reducing false beam failure declarations
3Reliability
If multiple transmission opportunities are configured for periodic BFD-RS, then the probability of successful transmission increases, but system complexity increases
Solution Approach 1:
The periodic BFD-RS transmission is segmented into multiple independent transmission opportunities within each periodicity. Each opportunity can be independently evaluated for LBT success, allowing the system to achieve higher overall transmission success probability while maintaining manageable complexity through modular configuration
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine configuration information associated with a periodic beam failure detection reference signal (BFD-RS) for a wireless channel that has a listen-before-talk requirement. The UE may monitor the wireless channel for the periodic BFD-RS or an aperiodic BFD-RS linked to the periodic BFD-RS based at least in part on one or more parameters in the configuration information that relate to mitigating non-transmission of the periodic BFD-RS in a scheduled occasion. Numerous other aspects are described.