Sidelink Configured Grant Type 2 Resource Suspension
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing configured grant (CG) type 2 resources, particularly when physical layer problems occur on the link between user equipment (UE) and the base station.
Innovation Solution
A method and apparatus for a user equipment (UE) and a base station to handle CG type 2 resources by identifying consecutive out-of-sync indications, starting a timer, and suspending the use of CG type 2 resources until the timer expires or the UE resumes synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CG type 2 resources are continuously used for sidelink communication, then communication efficiency and productivity are improved, but reliability deteriorates when physical layer problems occur
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors physical layer quality through out-of-sync indications from lower layers. When degradation is detected, the UE suspends use of CG type 2 resources and transitions to monitoring PDCCH for dynamic grants, creating a closed-loop feedback system that adapts resource usage based on channel conditions to balance efficiency and reliability
Solution Approach 2:
The patent introduces dynamic behavior to the resource usage pattern by implementing timer-based suspension. The UE dynamically switches between using CG type 2 resources (when conditions are good) and monitoring PDCCH (when degradation is detected), allowing the system to adapt its operational mode based on real-time physical layer quality assessments
2Reliability
If UE monitors physical layer quality continuously to detect out-of-sync indications, then reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent uses lower layer out-of-sync indications as an intermediary signal that abstracts the complex physical layer quality assessment. Instead of requiring the higher layer to directly analyze complex channel conditions, the system leverages pre-computed indicators from lower layers (MAC or physical layer) that summarize link quality in a manageable format, reducing monitoring complexity while maintaining reliability
3Reliability
If UE suspends CG type 2 resource usage upon detecting physical layer degradation, then reliability is improved, but productivity and communication efficiency decrease
Solution Approach 1:
The patent implements periodic monitoring of physical layer quality through consecutive out-of-sync indication counting. The UE periodically samples link quality and compares it against thresholds, suspending CG type 2 resources only when degradation persists for a sufficient duration (indicated by multiple consecutive failures), thereby avoiding premature suspension while maintaining reliability
4Reliability
If timer-based suspension mechanism is implemented for CG type 2 resources, then reliability is improved, but loss of time occurs during suspension period
Solution Approach 1:
The patent applies beforehand cushioning by implementing a counter threshold mechanism that requires multiple consecutive out-of-sync indications before triggering suspension. This cushioning approach prevents premature suspension due to transient degradation, allowing the system to tolerate temporary time loss while ensuring that suspension only occurs when genuine, sustained link degradation is detected, thereby protecting data integrity
Data Source
AI summary
A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving a physical downlink control channel (PDCCH) associated with a sidelink configured grant type 2, identifying whether a number of consecutive out-of-sync indications are received from lower layer, and starting a timer in case that the number of consecutive out-of-sync indications are received, wherein the UE does not use resources of the sidelink configured grant type 2 while the timer is running.