LBT Failure Recovery in Wireless Devices
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Solution Overview
Problem
Current wireless communication systems face delays and inefficiencies due to the need for listen-before-talk procedures to determine channel availability, which can lead to incorrect communication configurations and increased power consumption.
Innovation Solution
Implementing failure detection and recovery procedures that allow wireless devices to quickly establish communication by assessing channel occupancy and adapting configurations to reduce delays and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If listen-before-talk procedures are performed to determine channel availability, then interference with other communications is avoided, but transmission delays increase
Solution Approach 1:
The system performs preliminary channel occupancy assessments and failure detection before actual transmission attempts. By pre-evaluating channel conditions and detecting potential failures in advance, the system prepares communication configurations proactively, reducing the need for repeated listen-before-talk procedures and thereby decreasing transmission delays while maintaining interference avoidance
Solution Approach 2:
The system implements feedback mechanisms through failure detection procedures that monitor channel conditions and transmission outcomes. This feedback enables the system to adapt communication configurations dynamically, optimizing the balance between performing necessary channel assessments and minimizing unnecessary delays caused by repeated occupancy checks
2Reliability
If repeated listen-before-talk operations are performed to determine channel occupancy, then channel availability is accurately determined, but power consumption increases
Solution Approach 1:
The system performs preliminary failure detection and channel assessment operations before initiating full transmission sequences. By pre-evaluating channel conditions and detecting potential failures in advance, the system determines channel availability more efficiently, reducing the number of repeated power-consuming listen-before-talk operations needed while maintaining reliable determination accuracy
3Reliability
If failure recovery procedures are initiated based on channel occupancy determinations, then communication reliability is improved, but transmission delays increase
Solution Approach 1:
The system performs preliminary failure detection before initiating transmission, identifying potential channel failures in advance. By detecting failures proactively and preparing alternative communication configurations beforehand, the system can switch to recovery procedures more efficiently when needed, improving communication reliability while minimizing the time penalty associated with initiating recovery procedures
Solution Approach 2:
The system dynamically adjusts communication configurations based on real-time failure detection results. By making communication parameters adaptive and configurable based on detected channel conditions, the system can optimize the balance between initiating necessary failure recovery procedures and minimizing transmission delays, switching between normal and recovery modes as conditions dictate
Data Source
AI summary
A wireless device may perform a listen-before transmit (LBT) procedure for an uplink transmission. An LBT failure recovery procedure may be initiated based on a failure of one or more LBT procedures. The LBT failure recovery procedure may be aborted and/or canceled based on one or more conditions, such as receiving configuration (or reconfiguration) parameters, receiving an indication of a bandwidth part switching, deactivating a cell, and/or receiving a request to set (or reset) a communication layer of the wireless device.