Wireless Device LBT Failure Recovery During Mobility Procedures
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Solution Overview
Problem
Radio link failure detection is complicated in unlicensed frequency spectrum due to listen-before-talk (LBT) failures during device-triggered mobility procedures in wireless communication networks, leading to inconsistent uplink transmissions.
Innovation Solution
Configuring wireless devices with counters and timers to monitor and recover from consistent uplink LBT failures during mobility procedures, and indicating specific cells or cell parts to attempt recovery, along with reporting failure causes to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LBT procedure is implemented in unlicensed frequency spectrum, then spectrum access coordination is improved, but radio link failure detection becomes complicated
Solution Approach 1:
The patent segments the failure detection process by introducing separate counters (e.g., T310, N310) and timers specifically for LBT-related failures, distinguishing them from other radio link failures. This allows the system to track LBT failures independently without confusion from other failure types, resolving the detection complexity caused by the LBT procedure's integration into the radio link.
Solution Approach 2:
The patent introduces intermediate monitoring layers that observe LBT procedure outcomes and translate them into standardized failure indicators. These intermediaries (such as physical layer indicators to higher layers) act as mediators between the LBT mechanism and the radio link failure detection logic, simplifying the overall detection process by isolating the complexity into manageable translation steps.
2Measurement precision
If wireless device monitors for LBT failure during mobility procedure, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements universal counters and timers that serve multiple functions: they detect LBT failures during mobility procedures, monitor radio link quality, and trigger appropriate recovery actions. By making these monitoring elements multi-functional, the patent improves detection accuracy without proportionally increasing device complexity, as the same structures handle multiple detection tasks.
Solution Approach 2:
The patent configures the wireless device with pre-defined counters and timers before mobility procedures begin. These monitoring structures are prepared in advance with specific thresholds and timeouts, enabling accurate LBT failure detection without requiring complex real-time decision logic during the actual mobility execution, thus reducing operational device complexity.
3Reliability
If counters and timers are configured for LBT failure monitoring, then recovery capability is improved, but configuration complexity increases
Solution Approach 1:
The patent employs configurable parameters (counter thresholds, timer durations) that can be adjusted based on network conditions and mobility procedure types. By allowing dynamic parameter changes rather than fixed complex structures, the system improves recovery capability for different scenarios while keeping the configuration manageable through standardized parameter sets that can be tuned without redesigning the entire monitoring framework.
Data Source
AI summary
A wireless device is configured for use in a wireless communication network. The wireless device obtains a configuration that governs how the wireless device is to monitor for and/or attempt to recover from consistent uplink listen-before-talk (LBT) failure that occurs during a mobility procedure triggered by the wireless device. According to the obtained configuration, the wireless device monitors for and/or attempts to recover from consistent uplink LBT failure occurring during the mobility procedure.