NAS Protocol Access Management for 5G Congestion Control
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Solution Overview
Problem
In the 5G communication environment, there is a need for an efficient access management scheme using the NAS protocol to handle congestion and ensure smooth communication, particularly for services like MMTEL voice, MMTEL video, and SMS over IMS, especially in scenarios with multiple terminals accessing the network simultaneously, such as emergency situations or crowded events.
Innovation Solution
A method where a terminal generates an IMS signal and maps access category information to an access attempt type using the NAS layer, allowing the AS layer to determine access permissions, thereby controlling access and managing congestion by transmitting access category information to allow or block access based on predefined barring factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If access management is performed without separating mobility management and session management entities, then device complexity is reduced, but access control precision and service reliability deteriorate under congested conditions
Solution Approach 1:
The patent segments the access management function into two distinct entities: the AMF (Access and Mobility Management Function) for mobility management and the SMF (Session Management Function) for session management. This segmentation allows each entity to specialize in specific tasks, improving access control reliability under congested conditions while maintaining manageable device complexity through functional separation.
2Device complexity
If access category information is not mapped to access attempt type, then device complexity is reduced, but access control precision and congestion management capability deteriorate
Solution Approach 1:
The patent implements preliminary action by mapping access category information to access attempt type in advance within the NAS protocol. This pre-establishment of mapping relationships enables the AS layer to quickly determine access permissions without complex real-time calculations, achieving precise access control while maintaining simple device implementation.
3Device complexity
If access permissions are not determined by AS layer based on access category, then device complexity is reduced, but service quality under congested conditions deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism where the NAS layer acts as a mediator between the application layer and the AS layer. The NAS layer receives access category information, maps it to access attempt type, and transmits it to the AS layer for permission determination. This intermediary structure enables reliable service quality management under congestion while keeping the AS layer's decision logic simple and efficient.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. According to one embodiment of the disclosure, terminal access is controlled or terminal access is permitted by using NAS protocol in a 5G communication, and thus a congested situation can be controlled.