5GS to EPS Terminal Redirection via Mobility Management
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Solution Overview
Problem
Current cellular IoT systems lack a standardized method for redirecting terminals between different network systems, such as 5GS and EPS, which hampers load balancing and efficient resource management.
Innovation Solution
A redirection method and system architecture that involves mobility management network elements determining the supported and preferred CIOT features of terminals to redirect them between 5GS and EPS, using redirection indication messages to trigger handover procedures across different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a CIOT terminal accesses a 5GC or EPC, then the terminal can utilize modern mobile communication networks, but the system lacks a standardized redirection mechanism between 5GS and EPS, causing inefficiency in load balancing and resource management
Solution Approach 1:
The patent introduces a standardized redirection mechanism that acts as an intermediary between the 5GC/EPC and the terminal. The mobility management network element sends redirection indication information to the terminal, which then autonomously performs the redirection to the appropriate system (5GS or EPS) based on its capabilities and current network conditions, eliminating the need for complex manual intervention or ad-hoc redirection procedures
Solution Approach 2:
The patent utilizes parameter changes in the terminal's operation mode to achieve redirection. By changing the system selection parameter (5GS or EPS) based on the redirection indication information, the terminal can efficiently switch between networks. The mechanism also considers terminal capability parameters (CIOT feature support) to determine the appropriate target system, optimizing the redirection process
2Adaptability or versatility
If the system implements load balancing between 5GS and EPS, then resource utilization improves, but without a standardized redirection method, the load balancing cannot be effectively executed
Solution Approach 1:
The patent enables the terminal to autonomously perform redirection based on redirection indication information received from the mobility management network element. The terminal self-determines which system to access (5GS or EPS) based on its CIOT feature capabilities and the network's load balancing requirements, eliminating the need for complex network-controlled redirection procedures and simplifying the overall operation
Solution Approach 2:
The mobility management network element performs preliminary assessment of the terminal's CIOT feature capabilities before initiating redirection. By evaluating the terminal's supported features in advance and sending appropriate redirection indication information, the system prepares the redirection path beforehand, ensuring smooth load balancing execution without operational complexity during the actual redirection event
Data Source
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AI summary
This application provides a redirection method, a communications system, and a communications apparatus, to implement redirection of a terminal between different systems, and further implement redirection between a 5GS and an EPS. The method includes the following: A mobility management network element in a first system determines, based on a CIOT feature supported by a terminal in a second system and a CIOT feature preferred by the terminal in the second system, to redirect the terminal to the second system. Then, the mobility management network element in the first system sends redirection indication information to an access network network element in the first system, where the redirection indication information is used to indicate the access network network element in the first system to redirect the terminal from the first system to the second system. Subsequently, the mobility management network element in the first system receives a handover required message from the access network network element in the first system, selects a mobility management network element in the second system based on the handover required message, and sends a first message to the mobility management network element in the second system, where the first message is used to request to hand over the terminal to the second system.