5G PDU Session Status Management for Area-Based Access Control
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Solution Overview
Problem
In 5G wireless communication systems, there is a need to manage PDU session status effectively when a terminal moves between allowed and non-allowed areas to prevent unauthorized packet transmission/reception and minimize signaling overhead.
Innovation Solution
A method and device that determine whether a terminal has moved to an allowed or non-allowed area, transmitting this information to the access and mobility management function (AMF) or session management function (SMF) to change the PDU session status accordingly, allowing for blocking of packet transmission/reception in non-allowed areas and preventing additional packet generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal moves between allowed and non-allowed areas, then service control and security are improved, but signaling overhead increases due to repeated status updates
Solution Approach 1:
The network pre-configures the terminal with allowed area information and session status indicators before the terminal moves. When the terminal enters a non-allowed area, it can immediately apply the pre-received session status without triggering repeated signaling exchanges, thus reducing signaling overhead while maintaining service control
Solution Approach 2:
The terminal autonomously determines its location relative to allowed areas using pre-configured information and self-manages the session status application without requiring continuous network verification. This self-service mechanism reduces the signaling load on the network while ensuring service control compliance
2Reliability
If packet transmission is blocked in non-allowed areas, then security and service policy compliance are improved, but additional signaling is required to manage session status changes
Solution Approach 1:
The session management is segmented into network-controlled status indication and terminal-executed status application. The network provides session status indicators for specific allowed areas, while the terminal independently applies these statuses based on its location, dividing the complex session management task into manageable segments
Solution Approach 2:
A session status indicator acts as an intermediary mechanism between the network's security policy and the terminal's packet transmission control. This indicator conveys the allowed/non-allowed area status without requiring complex direct control signaling, simplifying the session management process while ensuring security compliance
3Loss of information
If the terminal continuously reports position changes, then network awareness of terminal location is improved, but signaling load on the network increases
Solution Approach 1:
The terminal uses pre-configured allowed area information to autonomously determine its location status and applies session statuses without requiring continuous position reporting to the network. This self-service location management maintains network awareness of terminal compliance while eliminating redundant signaling
Solution Approach 2:
The network performs preliminary provisioning of allowed area information and session status indicators before the terminal begins movement. This preliminary action enables the terminal to independently track its location status without subsequent reporting, ensuring the network has necessary location information while minimizing ongoing signaling load
Data Source
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AI summary
The present disclosure relates to a 5G or pre-5G communication system for supporting a data transmission rate higher than that of a 4G communication system such as LTE. According to one embodiment of the present invention, the present invention comprises the steps of: an access and mobility management function (AMF) of a 5G core network determining whether a terminal has moved to an area in which packet transmission/reception is possible, or an area in which packet transmission/reception is impossible; transmitting a message including information on the determination result to a session management function (SMF); and transmitting a response message including information associated with a change in the state of a session to the terminal. In addition, the present invention relates to a method and a device for blocking or allowing the transmission/reception of a packet transmission session (PDU session) according to the position of a terminal in a 5G system. In a 5G system, a local area data network service by which a packet session is valid only in a specific area will be supported, and a method is required for allowing the transmission of a packet of a session only in an area that can be divided into a cell or a tracking area. Additionally, in a 5G system, an allowed area in which the transmission/reception of a packet of a session according to each position of a terminal is allowed, and a non-allowed area in which same is not allowed are present, and thus packet transmission may be allowed or not according to area. In order to provide such service, the present invention provides a procedure whereby the state of a session is defined in a packet transmission non-allowed area, and a change in the state of the session occurs when moving from a packet transmission-allowed area to the non-allowed area.