Relay Device Selection for 5G Network Slice Session Setup
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Solution Overview
Problem
In a 5G network architecture integrating wired broadband access, user equipment (UE) may fail to establish sessions in required network slices due to the CPE not supporting the necessary network slices, leading to service disruptions.
Innovation Solution
A method for UE to select a relay device by obtaining and comparing network slice indication information, ensuring the relay device supports the required network slices, thereby establishing a successful session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CPE is used as a relay device for UE access, then the UE can connect to the core network through wired broadband access, but the UE cannot establish sessions in required network slices because the CPE does not support them
Solution Approach 1:
The patent introduces a session management function entity as an intermediary that mediates between the UE and the CPE. This entity determines whether to establish a session for the UE through the CPE by evaluating network slice requirements, thereby resolving the mismatch between CPE capabilities and UE requirements without limiting the CPE's relay functionality
Solution Approach 2:
The patent changes the parameter of session establishment by introducing a determination mechanism that evaluates network slice requirements before allowing session establishment. The session management function entity modifies the session establishment process by adding a check on whether the CPE supports the required network slice, thus adapting the system to handle capability mismatches
2Adaptability or versatility
If multiple relay devices are available for UE selection, then the UE can potentially find a suitable relay device that supports required network slices, but the UE cannot identify which relay device supports the required slices without additional information
Solution Approach 1:
The patent implements a feedback mechanism where relay devices report their supported network slices to the session management function entity. This feedback loop allows the system to accumulate information about relay device capabilities, enabling informed decisions about session establishment without requiring the UE to directly query each relay device
Solution Approach 2:
The session management function entity serves multiple functions: it manages sessions, determines session establishment feasibility, and maintains information about relay device capabilities. This multi-functional entity centralizes the management of relay device selection and network slice compatibility, eliminating the need for complex UE-side evaluation
Data Source
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AI summary
Embodiments of this application relate to the field of communications technologies, and disclose a session establishment method, a relay device selection method, a registration method, and a device, so that UE can establish a session in a network slice by using a relay device. The method may include: receiving, by an access network device, a first message sent by user equipment UE, where the first message includes a first session establishment request message and single-network slice selection assistance information S-NSSAI that is requested by the UE; sending, by the access network device, a first reconfiguration request message to the UE, where the first reconfiguration request message includes a first session establishment response message and data resource bearer DRB configuration information, and the DRB configuration information is information about a DRB corresponding to the S-NSSAI; and sending, by the access network device, a second reconfiguration request message to a relay device, where the second reconfiguration request message includes the DRB configuration information and a UE identity of the UE.