Rejected NSSAI Redirection for 5G Network Slice Resource Optimization
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Solution Overview
Problem
Current network slicing technologies face challenges in efficiently selecting and managing resources within sliced networks, particularly in 5G wireless communications, where network slice selection and resource allocation are not effectively optimized, leading to suboptimal performance and user experience.
Innovation Solution
The implementation of a system that includes a wireless terminal and access node capable of receiving and transmitting messages containing Rejected Network Slice Selection Assistance Information (NSSAI) and associated carrier frequency lists, allowing for redirection and cell selection procedures based on stored redirection information, thereby optimizing resource utilization and slice selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network slice selection is performed without redirection information, then the network can maintain simple architecture, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring redirection information in the network before slice selection occurs. The AMF stores redirection information mapping rejected network slices to alternative carrier frequencies, so that when a slice rejection occurs, the UE can immediately redirect to an appropriate frequency without complex real-time analysis, thus improving resource allocation efficiency while maintaining relatively simple network architecture.
2Measurement precision
If carrier frequency lists are provided for each rejected network slice, then cell selection accuracy is improved, but information processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the redirection information into discrete carrier frequency lists that are specifically associated with each rejected network slice identity. This segmentation allows the UE to efficiently match a rejected slice to its corresponding frequency list without processing all possible frequencies, improving cell selection accuracy while keeping information processing manageable through organized, slice-specific frequency mappings.
3Productivity
If redirection information is stored and used for cell selection, then network resource utilization is optimized, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the redirection information mapping between rejected network slices and carrier frequencies before actual slice selection and rejection events occur. This allows the system to optimize network resource utilization through efficient redirection while minimizing signaling overhead, as the redirection decisions can be made locally by the UE based on pre-configured information rather than requiring extensive real-time signaling exchanges.
Data Source
AI summary
A wireless terminal is served by a public land mobile network (PLMN) in which one or more network slices are provided. The wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry configured to receive a first message and a second message. The first message comprises a Rejected Network Slice Selection Assistance Information (NSSAI), the Rejected NSSAI further comprising identities of one or more rejected network slices. The second message, based on the first message, comprises redirection information. The redirection information comprises one or more carrier frequency lists, the one or more of the carrier frequency lists specifying at least one carrier frequency, the one or more of the carrier frequency lists being associated with the one or more of the identities of the rejected network slices included in the Rejected NSSAI. The processor circuitry is configured to store the redirection information, and to initiate, upon requesting a service with at least one of the network slices in the Rejected NSSAI, a cell selection procedure based on the stored redirection information.