5G PDU Session Management via NG Interface Interworking
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Solution Overview
Problem
In 5G networks, managing Packet Data Unit (PDU) sessions between 5G base stations and core networks is challenging due to the need for high-frequency, high-speed, and low-delay requirements, especially with the increased frequency band leading to smaller coverage areas and complex handover procedures, and the requirement for efficient interworking between different equipment manufacturers.
Innovation Solution
A method for managing PDU sessions through interworking between 5G core networks and base stations using an NG interface, involving determining QoS flow requirements, transmitting resource modification or release messages, and processing results via NGAP messages to ensure stable network connectivity and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 5G base station uses high frequency band (mmWave), then transmission speed is improved, but coverage area becomes smaller
Solution Approach 1:
The patent introduces a multi-level PDU session management structure where the base station is divided into functional units (session management unit, resource allocation unit, QoS control unit) that work together to manage sessions. This segmentation allows the system to handle the limited coverage area by efficiently managing multiple smaller coverage zones through coordinated session control, while maintaining high transmission speeds through dedicated resource allocation for each segment.
2Speed
If base station coverage is reduced due to high frequency, then transmission speed is improved, but handover frequency increases
Solution Approach 1:
The patent implements preliminary PDU session establishment and resource reservation between base stations before handover is needed. The session management unit pre-configures QoS parameters and resource allocations, so when handover occurs, the terminal can quickly switch without extensive re-negotiation. This preliminary action reduces the effective handover frequency impact by preparing resources in advance, maintaining high transmission speeds while managing the increased handover events.
3Reliability
If PDU session management is implemented between 5G base station and core network, then network connectivity is improved, but system complexity increases
Solution Approach 1:
The patent introduces a session management unit as an intermediary layer between the base station's radio resource management and the core network's PDU session control. This intermediary handles the complexity of PDU session establishment, modification, and release by translating between radio resource parameters and core network session parameters. It manages QoS flow bindings and resource allocations, shielding the rest of the system from complexity while maintaining reliable network connectivity through standardized interface procedures.
4Reliability
If QoS flow control is implemented in 5G, then service quality is improved, but processing complexity increases
Solution Approach 1:
The patent implements QoS flow control by dynamically changing parameters such as QoS flow identifiers, priority levels, and resource allocation parameters based on service requirements. The QoS control unit monitors traffic patterns and adjusts QoS parameters in real-time, transforming complex quality requirements into manageable parameter adjustments. This approach maintains high service quality through parameter optimization while reducing processing complexity by avoiding complete reconfiguration of QoS flows, instead making targeted parameter changes.
Data Source
AI summary
Provided is a method for managing a packet data unit (PDU) session between a base station and a core network in a next generation/5G radio access network (hereinafter, also referred to as NR (New Radio)). The method may include determining whether a requirement of a quality of service (QoS) flow for a terminal is satisfied, transmitting, to a core network entity, a PDU session resource notification message indicating that the requirement is not satisfied when the requirement is not satisfied, receiving one of a PDU session resource modification message and a PDU session resource release message from the core network entity, and transmitting a processing result on one of the PDU session resource modification message and the PDU session resource release message to the core network entity.