Dual Connectivity Access Barring via SCG Segmentation
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Solution Overview
Problem
Current access barring mechanisms in dual connectivity scenarios, such as those involving a Master Cell Group (MCG) and a Secondary Cell Group (SCG), are inadequate for managing severe or rapidly increasing overload, potentially leading to Quality of Service (QoS) issues and outages for high-priority services like public safety during extreme situations.
Innovation Solution
Implementing a method for a wireless communication device and network node to perform access barring checks using SCG access barring information, allowing the Secondary Node (SN) to control overload by determining access categories and applying barring factors to manage resource usage across the SCG, thereby preventing network overload and ensuring QoS for critical services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access barring mechanisms are applied to manage system load, then system overload is reduced, but high-priority services may be blocked during extreme situations
Solution Approach 1:
The patent divides the access control mechanism into separate components for MCG and SCG, allowing independent access barring configurations. This segmentation enables the network to apply different barring factors and thresholds to different cell groups, ensuring that high-priority services can access through one group even when the other is overloaded.
Solution Approach 2:
The patent implements location-specific access control by applying different access barring parameters to different cell groups (MCG and SCG) based on their local load conditions. Each cell group can have customized barring factors, thresholds, and priority service configurations, allowing localized optimization without affecting the entire system uniformly.
2Adaptability or versatility
If unified access control is applied to both MCG and SCG, then overall system load is managed, but fine-grained control over SCG-specific overload is lost
Solution Approach 1:
The patent segments the access control mechanism into separate configurations for MCG and SCG, allowing the network to apply different barring factors, thresholds, and priority service rules to each cell group independently, enabling fine-grained control over SCG-specific conditions.
Solution Approach 2:
The patent creates a universal access control framework that can handle both MCG and SCG scenarios through a common mechanism. The same access control logic and priority service handling principles apply to both cell groups, providing versatility while maintaining manageable complexity through standardized procedures.
3Reliability
If access barring is applied during normal operation, then system capacity is protected, but QoS for high-priority services deteriorates during extreme overload
Solution Approach 1:
The patent configures access barring parameters in advance, including barring factors, thresholds, and priority service exemptions, so that when overload occurs, the system can immediately apply the pre-configured protective measures without delay, ensuring high-priority services are protected from the outset.
Solution Approach 2:
The patent implements dynamic access control by allowing the network to adjust barring factors and thresholds based on real-time load conditions in each cell group. The system can transition between different barring states and apply different levels of restriction to MCG and SCG independently, adapting to changing conditions while maintaining QoS for priority services.
Data Source
AI summary
A method in a wireless communication device configured in dual connectivity with a master cell group, MCG, controlled by a master node, MN, and a secondary cell group, SCG, controlled by a secondary node, SN, to perform access barring check. The method includes receiving SCG access barring information. The method further includes identifying an access attempt. The method further includes determining an access category for the access attempt. The method further includes performing an access barring check for the access attempt using the access category determined and access barring information.