AMF Policy Control for Slice-Aware Cell Reselection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing network slice selection methods in wireless communication systems face inaccuracies in generating radio access technology/frequency selection priority indices due to the timeliness and regionality of network slice availability, leading to inefficient and inaccurate cell reselection by user equipment (UE).
Innovation Solution
A communication method and apparatus that utilizes a policy control function (PCF) network element to generate and send access and mobility management policies based on slice restriction information, including S-NSSAI, slice area of service, and validity time, ensuring accurate and efficient cell selection and reselection by UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a RFSP index is generated based on allowed NSSAI and target NSSAI to prevent UE from continuous cell reselection attempts, then cell reselection stability is improved, but when S-NSSAI is restricted with timeliness and regionality, the generated RFSP index becomes inaccurate and fails to redirect UE to appropriate cells
Solution Approach 1:
The patent applies preliminary action by having the network side determine and configure RFSP indexes in advance based on slice restriction information (S-NSSAI, area of service, validity time) before UE performs cell reselection. The AMF determines the RFSP index based on the S-NSSAI and sends it to the RAN, which then uses this pre-configured index to guide UE cell reselection, ensuring accuracy despite the dynamic nature of network slices.
Solution Approach 2:
The patent implements dynamics by making the RFSP index determination adaptive to changing network slice conditions. The AMF monitors slice restriction information including area of service and validity time, and dynamically adjusts the RFSP index assignment accordingly. This allows the system to respond to temporal and spatial variations in network slice availability, maintaining both stability and accuracy.
2Productivity
If network slices are deployed with specific time intervals and regional limitations, then network resource allocation efficiency is improved, but the accuracy of slice-based cell selection and reselection deteriorates due to the dynamic nature of slice availability
Solution Approach 1:
The patent applies feedback by implementing a mechanism where the AMF continuously monitors slice restriction information including area of service and validity time, and uses this feedback to dynamically adjust RFSP index assignments. This closed-loop approach ensures that cell selection and reselection remain accurate despite the dynamic temporal and spatial nature of network slice deployment.
Solution Approach 2:
The patent uses preliminary action by having the network side pre-determine and configure appropriate RFSP indexes based on slice restriction information before UE performs cell reselection. This proactive configuration ensures that even as slices are deployed with specific time intervals and regional limitations, the RFSP indexes remain accurate and guide UE correctly.
3Reliability
If the initial AMF selects a target AMF that supports the required network slice, then network service availability is improved, but the complexity of the registration procedure increases due to additional querying and selection steps
Solution Approach 1:
The patent applies merging by combining the slice support verification and target AMF selection processes. The initial AMF queries the NSSF for both slice support information and target AMF selection in a coordinated manner, reducing the number of separate signaling exchanges and simplifying the overall registration procedure while ensuring service availability.
Data Source
AI summary
This application discloses a communication method and a communication apparatus One example method includes: sending, by a policy control function network element, a trigger to an access and mobility management function network element; obtaining, by the policy control function network element, first information from the access and mobility management function network element; generating, by the policy control function network element, an access and mobility management policy based on the first information; and sending, by the policy control function network element, the access and mobility management policy to an access and mobility management function network element.