HPLMN Event Notification Control for Roaming Permission Checks
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Solution Overview
Problem
Existing methods for handling exposure to events in roaming scenarios in 5G networks result in high overhead and latency, as they do not effectively enforce service level agreements at the visiting Public Land Mobile Network (VPLMN), leading to inefficient signaling and resource utilization.
Innovation Solution
A method where a first node in the Home Public Land Mobile Network (HPLMN) determines and enforces permission for a third node to receive event notifications based on pre-existing agreements, allowing exposure information to be managed at the HPLMN level, thereby avoiding unnecessary signaling to VPLMNs where permission is not granted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If event exposure notifications are sent to all serving AMFs in VPLMN without checking permission, then the device can receive event notifications while roaming, but signaling overhead and latency increase due to unnecessary transmissions to networks without permission
Solution Approach 1:
The home network performs preliminary permission verification with the visiting network before sending event exposure notifications. The AMF in the home network checks whether the visiting network has permission to receive event notifications for the roaming device, and only sends notifications to networks that have been pre-authorized. This prevents unnecessary signaling transmissions and reduces overhead.
2Reliability
If event exposure notifications are sent to all serving AMFs in VPLMN without checking permission, then the device can receive event notifications while roaming, but latency increases due to unnecessary signaling rounds
Solution Approach 1:
The permission check is performed in advance by the home network AMF before initiating event notification transmissions. By verifying permission status beforehand, the system avoids multiple failed transmission attempts and retransmission protocols that would increase latency, thereby reducing the overall time for successful event notification delivery.
3Loss of energy
If the home network enforces service level agreements for event exposure, then signaling overhead is reduced by avoiding unnecessary transmissions, but the complexity of permission management increases
Solution Approach 1:
The home network AMF acts as an intermediary that centralizes permission management for event exposure. Instead of each visiting network independently managing permissions, the home network AMF verifies permission status with visiting networks and enforces service level agreements centrally. This intermediary approach simplifies the overall system by consolidating control logic in one location.
4Productivity
If permission verification is performed at the home network level, then exposure restrictions are enforced efficiently, but the complexity of the home network functions increases
Solution Approach 1:
The home network AMF serves as an intermediary that handles permission verification logic. By placing this function in the home network AMF rather than distributing it across multiple visiting networks, the system achieves efficient centralized enforcement of exposure restrictions. The intermediary AMF manages the complexity of permission checks, service level agreement verification, and selective notification routing in one location.
Data Source
AI summary
A computer-implemented method, performed by a first node. The method is for handling exposure to an event for a device. The first node operates in a first communications network, a home network to the device and to a second node. The first node determines whether a third node operating via the first communications network has permission to receive notifications of the event while the device is roaming in a second communications network. The determining is based on one or more agreements of the third node with the first communications network to service the device in one or more roaming communications networks. The first node sends second indication to the second node operating in the first communications network. The second indication indicates a result of the determination.