Configured Grant Uplink Duplication for Adaptive URLLC Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in providing reliable and low-latency data transmission for Ultra-Reliable Low-Latency Communications (URLLC) due to the inefficiencies in managing configured grants and packet duplication in 5G New Radio (NR) networks, particularly in scenarios requiring frequency and spatial diversity.
Innovation Solution
Implementing PDCP duplication schemes that transmit duplicated PDCP Protocol Data Units (PDUs) over independent paths, utilizing configured grants (CGs) for uplink transmission, and dynamically managing CGs based on triggering criteria such as channel status, queuing delay, and performance metrics to enhance reliability and latency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet duplication is used to increase transmission reliability, then the reliability of data transmission is improved, but the resource utilization deteriorates due to duplicate transmissions consuming additional network resources
Solution Approach 1:
The system enables self-service by allowing the UE to autonomously determine and activate configured grants based on triggering criteria (such as buffer status, channel conditions, or scheduling requests) without requiring continuous network control signaling. This self-service mechanism reduces unnecessary duplicate transmissions while maintaining reliability, as packets are only duplicated when truly needed based on real-time network conditions
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the duplication status and grant activation based on varying network conditions. The system monitors parameters such as channel quality indicators, buffer status reports, and scheduling request patterns, then modifies transmission parameters (duplication enablement, grant timing, resource allocation) accordingly to optimize both reliability and resource efficiency
2Loss of time
If configured grants are used for uplink transmission to reduce latency, then the latency performance is improved, but the adaptability to varying network conditions deteriorates due to fixed grant structures
Solution Approach 1:
The system implements dynamics by enabling flexible activation and deactivation of configured grants based on triggering criteria. Instead of using fixed, static grant allocations, the UE can dynamically activate grants when specific conditions are met (such as buffer threshold crossings, channel quality changes, or scheduling opportunities) and deactivate them when no longer needed, thus reducing latency while adapting to varying network conditions
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple grants with different parameters (timing, frequency resources, modulation schemes) in advance. When a triggering criterion is met, the appropriate pre-configured grant is activated without requiring real-time network signaling, enabling low-latency transmission while maintaining adaptability through the pre-planned diversity of grant configurations
3Reliability
If multiple configured grants are activated for different paths to ensure diversity, then the reliability through frequency and spatial diversity is improved, but the device complexity increases due to managing multiple grants and paths
Solution Approach 1:
The system applies segmentation by dividing the transmission task into multiple independent paths, each with its own configured grant. The UE segments the data transmission across different frequency resources and spatial paths (such as different component carriers or antenna ports), managing each segment independently with dedicated grants. This segmentation approach ensures diversity while keeping the complexity manageable through modular, independent grant management for each path
4Reliability
If packet duplication is continuously activated to maintain reliability, then the reliability is improved, but the loss of time due to unnecessary transmissions increases
Solution Approach 1:
The system implements periodic action by activating packet duplication only during specific periods or conditions rather than continuously. The UE monitors triggering criteria (such as buffer status thresholds, channel quality indicators, or scheduling request patterns) and activates duplication periodically when these criteria are met. This periodic activation maintains reliability during critical transmission periods while avoiding unnecessary duplicate transmissions during stable conditions, thus reducing time waste
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An apparatus comprising means for performing: receiving a configuration message from a base station, wherein the configuration message comprises instructions to use at least one first path for uplink transmission of a first group of data packets, and to use at least one configured grant in at least one second path for uplink transmission of duplicate packets of the first group of data packets; and in response to determining that at least one event has occurred, modifying at least one condition of the at least one configured grant for the uplink transmission of the duplicated packets.