Non-3GPP Access Capability Signaling for PDN Connection
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Solution Overview
Problem
Current methods for accessing a core network through non-3GPP systems face challenges in establishing extra PDN connections and ensuring service continuity, particularly due to the inability of User Equipment (UE) to transfer essential information like Access Point Name (APN) and Packet Data Network (PDN) type, leading to inefficient IP address allocation and service disruptions during access system switching.
Innovation Solution
A method where User Equipment (UE) sends capability information, which is used to decide whether to transfer information required for establishing an Evolved Packet Core (EPC) session, with the capability information carried in Extensible Authentication Protocol (EAP) or Dynamic Host Configuration Protocol (DHCP) messages, allowing the non-3GPP access system to determine if the UE can support the transfer of APN and other necessary information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE transfers APN and PDN type information in non-3GPP access, then extra PDN connection establishment and service continuity are enabled, but UE capability compatibility and network complexity increase
Solution Approach 1:
The patent applies preliminary action by having the UE send capability information indicating support for transferring APN and PDN type information before the actual data transfer occurs. This capability indication is sent during the initial access or session establishment phase, allowing the network to prepare appropriate handling procedures in advance. The network element receives this capability information and stores it for subsequent use when processing APN and PDN type transfers, ensuring that the necessary capabilities are established before needed.
Solution Approach 2:
The patent uses an intermediary approach by introducing a standardized capability information message format that mediates between the UE and the network element. This capability information acts as an intermediary layer that carries the UE's capability to transfer APN and PDN type information without requiring direct complex interactions. The network element uses this intermediary capability indication to determine whether to proceed with transferring these critical parameters, simplifying the interaction while enabling enhanced functionality.
2Productivity
If UE transfers APN and PDN type information, then IP address allocation efficiency improves, but information transfer reliability requirements increase
Solution Approach 1:
The patent implements feedback by having the network element send a decision result back to the UE indicating whether the transferred capability information is acceptable. This feedback mechanism allows the network to verify the received capability information and communicate any issues or requirements back to the UE. The UE can then adjust its behavior based on this feedback, ensuring reliable information transfer while maintaining efficient IP address allocation through the initial capability indication.
Data Source
AI summary
A method, device and system for accessing a core network by means of non-3rd Generation Partnership Project (3GPP) access are disclosed, so as to acquire capability information of a User Equipment (UE) and/or capability information of a non-3GPP access system, and decide, according to the acquired capability information, whether the UE transfers information required for establishing an Evolved Packet Core (EPC) session. The disclosure can enhance the capability of the UE to support establishment of an extra Packet Data Network (PDN) connection and service continuity during switching between access systems. Meanwhile, the capability of a peer can be acquired through the UE and a network, so that the network may support normal access by an existing UE and an enhanced UE simultaneously.