Dynamic PDCP Duplication Control for 5G NR-U Reliability
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Solution Overview
Problem
The existing 5G NR-U communication system faces challenges in supporting data duplication effectively due to Listen-Before-Talk (LBT) failures, which impact transmission reliability and latency, especially in unlicensed spectrum scenarios where channel occupancy and LBT performance are not adequately considered for triggering PDCP duplication.
Innovation Solution
The proposed solution involves using channel sensing statistics and occupancy information to decide whether to initiate data duplication, enabling or disabling it based on these factors, and extending the NR user plane protocol to include channel occupancy and LBT performance metrics for improved reliability and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication is always enabled to improve transmission reliability, then reliability is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent implements dynamic control of data duplication by enabling the PDCP entity to adjust duplication status based on real-time channel conditions. The system transitions from static always-on duplication to dynamic on-demand duplication, where the duplication function is activated only when channel sensing indicates poor conditions (e.g., high LBT failure ratio or excessive channel occupancy), thereby reducing unnecessary resource consumption and device complexity while maintaining reliability when needed
Solution Approach 2:
The patent changes the operational parameters of data duplication by introducing channel sensing metrics (LBT failure ratio, channel occupancy) as triggering conditions. Instead of fixed duplication behavior, the system monitors channel parameters and adjusts duplication status based on threshold comparisons, allowing the system to adapt to varying channel conditions and optimize the balance between reliability and complexity
2Loss of time
If data duplication is enabled to reduce latency, then latency is reduced, but resource consumption and device complexity increase
Solution Approach 1:
The system dynamically activates data duplication only when channel conditions deteriorate (high LBT failure ratio or channel occupancy above threshold), avoiding continuous duplication operation. This on-demand approach reduces latency during critical periods while minimizing resource consumption and device complexity during normal operating conditions
Solution Approach 2:
The system performs channel sensing and evaluation in advance to predict when duplication will be needed. By monitoring LBT failure ratios and channel occupancy before transmission attempts, the system can proactively enable duplication when conditions indicate potential failures, reducing latency without continuously maintaining duplication resources
3Reliability
If channel sensing and duplication control mechanisms are added, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the PDCP entity receives channel sensing information (LBT failure ratio, channel occupancy) and uses this feedback to control duplication status. The system continuously monitors channel conditions and adjusts duplication accordingly, creating a closed-loop control system that improves reliability through informed decision-making while avoiding unnecessary complexity through rule-based control logic
Solution Approach 2:
The PDCP entity autonomously controls data duplication based on received channel sensing information without requiring external intervention. The system self-evaluates channel conditions, self-decides when to activate or deactivate duplication, and self-manages the duplication process, reducing the need for complex external control mechanisms while maintaining high reliability
Data Source
AI summary
A method performed by a communication device. The method includes the communication device receiving assistance information, wherein the assistance information comprises at least one of: i) channel sensing statistics information (e.g., LBT failure ratio) and ii) channel occupancy, CO, information related to channel occupancy of a channel. The method further includes the communication device making a decision based on the received assistance information.