Network Slice Validity Signaling for PDU Session Management
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Solution Overview
Problem
In 5G mobile communication systems, terminal devices face inefficiencies when trying to establish PDU sessions with temporarily deployed network slices, as they lack information on the validity conditions of these slices, leading to repeated signaling attempts and increased consumption.
Innovation Solution
The network device synchronizes validity information about temporarily deployed network slices with terminal devices, indicating their availability for PDU session establishment or modification requests, allowing the devices to determine whether to initiate sessions based on location and time criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device repeatedly attempts to establish a PDU session with a temporarily deployed network slice, then the terminal device can potentially access the network slice, but the signaling consumption increases
Solution Approach 1:
The network device provides validity information about the temporarily deployed network slice to the terminal device in advance, including validity conditions such as time period or location requirements. This preliminary information allows the terminal device to determine beforehand whether to attempt PDU session establishment, avoiding unnecessary repeated signaling attempts and reducing signaling consumption while maintaining reliable access when conditions are met.
2Ease of operation
If the terminal device does not have validity information of the network slice, then the terminal device can simplify the decision process, but the terminal device cannot determine whether to initiate sessions based on location and time criteria
Solution Approach 1:
The network device provides validity information feedback to the terminal device, including validity conditions such as time periods and location requirements. This feedback enables the terminal device to make informed decisions about whether to initiate PDU session establishment based on current conditions, optimizing both the simplicity and timing of session initiation decisions.
3Loss of energy
If the network device provides validity information to the terminal device, then the signaling consumption is reduced, but the network device complexity increases
Solution Approach 1:
The network device utilizes existing message structures and interfaces to convey validity information, integrating this function into existing network procedures rather than creating separate complex mechanisms. This approach reduces signaling consumption by leveraging existing protocols while avoiding significant increases in network device complexity.
Data Source
AI summary
A communication method, a terminal device, and a network device are provided. The method is applicable to a terminal device and includes the following. The terminal device receives validity information of a network slice from a network device, where the validity information indicates whether the network slice is available for a PDU session establishment request or a PDU session modification request.