Session Management Node QoS Policy Adjustment for Roaming
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Solution Overview
Problem
In current 5G network roaming scenarios, the visiting network lacks the ability to adjust Quality of Service (QoS) parameters based on a roaming agreement during PDU session establishment, leading to potential rejection of PDU sessions and suboptimal network performance.
Innovation Solution
Implementing a method where the session management node in the visiting network sends a QoS policy to the home network during PDU session establishment, allowing the home network to apply the roaming agreement's QoS parameters to the terminal device, and if necessary, modify subscribed QoS parameters to ensure compliance with the visiting network's policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the visiting network does not have the ability to adjust QoS parameters based on roaming agreement, then the PDU session establishment procedure is simple, but the QoS compliance with roaming agreement cannot be ensured and PDU sessions may be rejected
Solution Approach 1:
The patent introduces a QoS policy adjustment mechanism where the visiting network's session management node acts as an intermediary to negotiate and adjust QoS parameters with the home network based on roaming agreements. This mediator mechanism enables QoS compliance without requiring complete system redesign, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent implements dynamic QoS parameter adjustment during PDU session establishment, allowing the system to adapt QoS parameters in real-time based on roaming agreements rather than using static pre-configured values. This dynamic approach ensures QoS compliance while maintaining operational flexibility.
2Productivity
If the visiting network cannot adjust QoS parameters during PDU session establishment, then the network operation is simple, but the network performance and KPIs are suboptimal
Solution Approach 1:
The patent applies preliminary action by having the visiting network's session management node send the QoS policy to the home network during the PDU session establishment phase, before the actual data transmission begins. This allows QoS parameters to be pre-configured and optimized, improving network performance without adding complexity during runtime operation.
Solution Approach 2:
The patent implements a feedback mechanism where the home network receives the QoS policy from the visiting network, processes it against roaming agreements, and returns adjusted QoS parameters. This feedback loop enables continuous optimization of network performance while maintaining manageable system complexity.
3Reliability
If the home network does not receive QoS policy from visiting network, then the home network operation is simple, but the subscribed QoS parameters cannot be modified to ensure roaming agreement compliance
Solution Approach 1:
The patent makes the home network's session management node multi-functional by enabling it to not only retrieve subscribed QoS parameters from the UDM but also to receive and process QoS policies from the visiting network. This universal approach allows the home network to handle multiple QoS-related functions through a single mechanism, ensuring roaming compliance without proportionally increasing complexity.
Data Source
AI summary
Methods and apparatuses are disclosed for facilitating roaming of terminal device. According to an embodiment, a session management node operable in a home network receives, from another session management node operable in a visiting network, a quality of service (QoS) policy per a roaming agreement between the visiting network and the home network during establishment of a protocol data unit (PDU) session for a terminal device. The session management node retrieves, from a subscriber management node, subscribed QoS parameters of the terminal device. The session management node obtains a result that is generated based on the QoS policy per the roaming agreement and the subscribed QoS parameters of the terminal device.