AMF Node Access Network Validation for SM Signal Transmission
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in transmitting session management signals to user equipment (UE) connected to multiple access networks, particularly due to issues with access network validation and user plane activation, leading to potential unintended signal transmission to incorrect networks.
Innovation Solution
The proposed method involves an Access and Mobility Management Function (AMF) node that receives requests from a Session Management Function (SMF) to transmit session management signals, determining the appropriate access network based on provided information and ensuring the UE is connected to that network before transmission, and notifying the SMF if the UE is in a connection management IDLE state or if transmission is not possible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AMF transmits SM signals to all connected access networks, then the signal delivery coverage is maximized, but the risk of transmitting to unintended networks increases
Solution Approach 1:
The patent applies preliminary action by validating the access network connection before transmitting the SM signal. The AMF checks whether the UE is connected to the indicated access network prior to signal transmission, preventing transmission to unintended networks while maintaining reliable delivery to the correct network.
2Reliability
If the AMF validates the access network connection before transmission, then the signal transmission accuracy is improved, but the transmission delay increases
Solution Approach 1:
The access network validation is performed as a preliminary check before SM signal transmission. This ensures that the UE is connected to the indicated access network before the signal is sent, improving transmission accuracy while minimizing delay by performing the validation only when needed.
3Adaptability or versatility
If the system supports multiple access networks, then the network versatility is improved, but the difficulty of detecting and measuring the correct access network increases
Solution Approach 1:
The patent uses feedback by including information about the indicated access network in the SM signal transmission request from the SMF to the AMF. The AMF uses this feedback information to identify and validate the correct access network, making it easier to detect and measure the appropriate network among multiple options.
Data Source
AI summary
To achieve the aforementioned objective, one disclosure of the present specification may provide a method for transmitting an SM signal to a terminal capable of connecting to a plurality of access networks. The method may comprise the steps of: an AMF node receiving a request for transmission of the SM signal from an SMF node, the request comprising information about an access network to transmit the SM signal; the AMF node determining an access network to transmit the SM signal to the terminal on the basis of information about the access network; and if the terminal is connected to the AMF node via the determined access network, the AMF node transmitting the SM signal to the terminal via the determined access network.