Network Slice Coexistence Rules for Roaming Scenarios
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Solution Overview
Problem
Existing technologies face challenges in supporting location-based or time-based coexistence rules for network slices, particularly in roaming scenarios, and struggle with mapping information between allowed and requested S-NSSAI in home NSSF.
Innovation Solution
The implementation of enhanced signaling mechanisms to transmit and receive coexistence rules among visited and home NSSF, along with mechanisms to determine roaming scenarios and provide mapping information between allowed and requested S-NSSAI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If location-based coexistence rules are implemented for network slices, then network slice management accuracy is improved, but signaling complexity between NSSF nodes increases
Solution Approach 1:
The patent segments the network slice management by separating the home NSSF and visited NSSF functions, allowing location-based coexistence rules to be evaluated and applied at the visited NSSF based on UE location information. This segmentation enables precise local decision-making while maintaining centralized coordination through the home NSSF, thus improving management accuracy without overwhelming signaling complexity.
Solution Approach 2:
The patent introduces the visited NSSF as an intermediary between the UE and home NSSF for location-based slice management. The visited NSSF receives location information, evaluates coexistence rules locally, and only communicates essential decisions with the home NSSF, reducing direct signaling complexity while maintaining accurate location-based management through this intermediary layer.
2Reliability
If enhanced signaling mechanisms are implemented to transmit coexistence rules, then network performance in roaming scenarios is improved, but message exchange overhead increases
Solution Approach 1:
The patent applies preliminary action by having the home NSSF provide coexistence rules to the visited NSSF in advance, before actual network slice selection occurs. This pre-provisioning of rules enables the visited NSSF to make immediate, reliable decisions in roaming scenarios without requiring extensive real-time message exchanges, thus improving network performance while reducing message overhead during critical operations.
Solution Approach 2:
The patent implements local quality by enabling the visited NSSF to independently evaluate and apply coexistence rules based on local UE location information. This localized decision-making capability ensures reliable network performance in roaming scenarios without requiring constant communication with the home NSSF, thereby reducing message exchange overhead while maintaining high reliability.
3Measurement precision
If mapping information between allowed and requested S-NSSAI is provided, then slice selection accuracy is improved, but information processing complexity increases
Solution Approach 1:
The patent extracts and provides only the essential mapping information between allowed and requested S-NSSAI that is necessary for accurate slice selection. By selectively providing only the relevant mapping relationships needed for coexistence rule evaluation, the system achieves improved slice selection accuracy without overwhelming the information processing complexity with unnecessary data.
Data Source
AI summary
One or more location based network slice coexistence rules for one or more locations of a wireless device are received from a network node. A reqest message for a first network slice for the wireless device is received from the wireless device being at a first location. A determination is made to accept the first network slice based on the first location and the one or more location based network slice coexistence rules. A first response message indicating acceptance of the first network slice is sent.