Non-3GPP Network Access Registration for N5CW Devices
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Solution Overview
Problem
Non-5G-capable devices (N5CW) cannot be successfully registered with a network when accessing through a non-3GPP access network due to lack of support for NAS signaling, particularly when the selected network is not their home network.
Innovation Solution
A communication method involving a non-3GPP access network device that receives identification information from a terminal, determines an access and mobility management function device based on this information, and sends registration requests to ensure successful network registration, utilizing subscription permanent identifiers (SUPI) or subscription concealed identifiers (SUCI) to authenticate the terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If N5CW devices access network through non-3GPP access network device, then device can connect to network, but device cannot be successfully registered when network is not home network
Solution Approach 1:
The patent introduces an access network device as an intermediary between the N5CW terminal and the core network. This intermediary translates and forwards registration information, enabling the terminal to register successfully even when accessing through non-home networks. The access network device mediates the communication by converting terminal capabilities into formats compatible with core network requirements.
Solution Approach 2:
The registration process is segmented into distinct functional components: terminal identification, home network identification, target network identification, and AMF determination. By dividing the registration information into these separate identifiable elements, the system can process each component independently, allowing successful registration even when the target network differs from the home network.
2Measurement precision
If terminal sends complete identification information, then registration accuracy improves, but information processing complexity increases
Solution Approach 1:
The identification information is segmented into three distinct types: first identification information (terminal identity), second identification information (home network identity), and third identification information (target network identity). This segmentation allows the access network device to process each element separately and systematically, reducing overall processing complexity while maintaining high identification accuracy.
Solution Approach 2:
The patent transforms the registration process by changing the parameters sent by the terminal from traditional NAS signaling parameters to a simplified set of identification information elements. This parameter transformation reduces the complexity of information processing while maintaining the precision needed for accurate network registration and AMF determination.
Data Source
AI summary
This application relates to the communication field, and in particular, to a network access method and apparatus. The solutions may be applied to a communication system including a terminal that does not support non-access stratum signaling, for example, the terminal is an N5CW device, or may be applied to a communication system including a non-3GPP access network device, for example, the access network device is a TWAN device. In the method, an access network device may obtain an identifier of a home network of a terminal and an identifier of a target network. The identifier of the target network may be for determining an AMF, and the identifier of the home network may be for determining an AUSF, to ensure that the terminal can be successfully registered with a network when accessing the network through a non-3GPP access network device, so as to improve network access reliability.