NPN Terminal IMS Access via PLMN Interworking
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Solution Overview
Problem
In private networks (NPNs), services like Internet Protocol Multimedia Service System (IMS) are not supported, leading to increased network deployment costs and complexity due to the need for separate IMS deployment.
Innovation Solution
Enabling terminal devices in NPNs to interwork with Public Land Mobile Networks (PLMNs) using indication information, allowing access to IMS without separate IMS deployment in the NPN, thereby reducing network deployment costs and system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate IMS deployment is implemented in NPN, then IMS service support is achieved, but network deployment cost and system complexity increase
Solution Approach 1:
The NPN access network device is designed to support both NPN-specific services and PLMN IMS services simultaneously. By implementing multi-functionality in the access network device, the system can serve NPN users while providing IMS access through PLMN, eliminating the need for separate IMS deployment in NPN and reducing overall network complexity.
Solution Approach 2:
The PLMN network acts as an intermediary that provides IMS services to NPN terminal devices. Instead of deploying IMS directly in the NPN, the system uses the PLMN as a mediator to deliver IMS services to NPN users, thereby reducing NPN deployment complexity while maintaining service support.
2Adaptability or versatility
If separate IMS deployment is implemented in NPN, then IMS service support is achieved, but network deployment cost increases
Solution Approach 1:
The access network device is designed to provide both NPN access and PLMN IMS access functions. This multi-functional design allows the same infrastructure to serve dual purposes, reducing the need for separate IMS deployment and thereby lowering network deployment costs while maintaining IMS service support.
Solution Approach 2:
The system merges NPN access functionality with PLMN IMS access functionality in a unified network architecture. By combining these functions rather than deploying them separately, the system reduces overall deployment costs while ensuring IMS services are available to NPN terminal devices.
3Reliability
If NPN uses independent network elements, then isolation from PLMN is achieved, but service compatibility is reduced
Solution Approach 1:
The network architecture is segmented into independent NPN core network elements and PLMN IMS network elements, with the access network device serving as the interface. This segmentation maintains isolation between NPN and PLMN core elements while enabling service compatibility through the access device's ability to communicate with both networks.
Solution Approach 2:
The access network device serves as an intermediary that enables service compatibility between isolated NPN and PLMN networks. It maintains the isolation of NPN core elements while providing a bridge to PLMN IMS services, thereby achieving both network isolation and service compatibility.
Data Source
AI summary
A wireless communication method and device are provided. The method includes: receiving, by a terminal device, first indication information indicating that the terminal device and a first Public Land Mobile Network (PLMN) are capable of interworking with each other. With the first indication information, the terminal device and the first PLMN can interwork with each other. That is, with the first indication information, the terminal device can access an IMS in the first PLMN. It is possible to not only enable the terminal device in an NPN to be connected to the IMS, but also avoid separate deployment of the IMS in the NPN, such that the network deployment cost and system complexity can be reduced.