Wireless Device LBT Failure Recovery Mechanism
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Solution Overview
Problem
Wireless communication systems face challenges in managing consistent listen-before-talk (LBT) failures, particularly in unlicensed or shared spectrum environments, where predicting interference and ensuring quality-of-service is more unpredictable compared to licensed spectrum.
Innovation Solution
The implementation of advanced wireless device and base station processes that employ unlicensed or shared spectrum, utilizing techniques like listen-before-talk (LBT) and dynamic frequency selection (DFS) to manage channel access, and employing mechanisms for fair sharing of unlicensed spectra with other operators, such as dynamic channel access procedures and adaptive bandwidth management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If listen-before-talk (LBT) procedures are implemented in unlicensed spectrum, then interference management is improved, but channel access reliability deteriorates due to unpredictable interference from other systems
Solution Approach 1:
The patent applies preliminary action by performing listen-before-talk (LBT) procedures before transmitting data in unlicensed spectrum. The wireless device performs clear channel assessment (CCA) and LBT operations in advance to detect interference and determine channel availability, thereby managing interference proactively before transmission occurs. This preliminary detection and assessment action resolves the contradiction by systematically addressing interference management while maintaining reliable channel access through pre-transmission validation.
2Adaptability or versatility
If dynamic channel access procedures are used for fair sharing of unlicensed spectrum, then spectrum sharing fairness is improved, but quality-of-service predictability deteriorates
Solution Approach 1:
The patent applies dynamics by implementing dynamic channel access procedures where transmission parameters, channel selection, and access timing are adjusted in real-time based on detected interference conditions and channel availability. The system dynamically adapts its behavior to achieve fair sharing of unlicensed spectrum among multiple operators while managing quality-of-service through continuous monitoring and adjustment of transmission strategies based on actual channel conditions.
Solution Approach 2:
The patent applies feedback mechanisms by continuously monitoring channel conditions, interference levels, and transmission outcomes in unlicensed spectrum. The wireless device and base station use this feedback information to adjust channel access strategies, transmission power, and resource allocation dynamically. This feedback loop enables fair spectrum sharing while maintaining quality-of-service predictability through data-driven adaptation to changing channel conditions.
3Productivity
If aggressive channel access strategies are employed to increase user data rates, then productivity is improved, but interference to other systems increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission parameters such as power level, modulation scheme, coding rate, and channel selection based on detected channel conditions and interference levels. When channel conditions are favorable, the system increases data rates by using higher order modulation and reducing redundancy. When interference is detected, the system adapts by lowering power, switching to more robust modulation, or selecting alternative channels, thereby maintaining productivity while controlling interference to other unlicensed spectrum users.
Data Source
AI summary
A wireless device may receive first configuration parameters for uplink LBT failure recovery. The wireless device may create a transport block, comprising an LBT failure MAC CE, scheduled for transmission via a first cell at a first timing. The wireless device may trigger consistent LBT failure for the first cell based on the first configuration parameters and before the first timing. In response to the triggering, the wireless device may drop or transmit the transport block based on one or more conditions.