Roaming Terminal PLMN Validation and PDU Session Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 5G mobile communication systems lack an effective method for a terminal to select and communicate with an appropriate Public Land Mobile Network (PLMN) during roaming, especially when out of range of the registered network, necessitating a solution for data communication support in visited PLMNs.
Innovation Solution
A method and device for a terminal to transmit a registration request to a first VPLMN, receive and validate roaming information, set a timer for releasing the PDU session, and select a second VPLMN based on the roaming information, along with an AMF to manage this process, ensuring secure and efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal roams to a visited PLMN for data communication, then the terminal can maintain connectivity outside home network range, but the terminal lacks effective methods to select and verify appropriate PLMNs, compromising communication reliability
Solution Approach 1:
The terminal validates roaming information received from the visited PLMN by verifying PLMN identity and checking against stored home network roaming partner lists. This feedback mechanism ensures the terminal only communicates with authorized PLMNs, resolving the reliability issue while maintaining roaming adaptability
Solution Approach 2:
The terminal pre-stores a list of authorized roaming partner PLMNs provided by the home network before roaming occurs. When roaming, the terminal performs preliminary verification by comparing received PLMN information against this pre-stored list, enabling reliable PLMN selection before actual data communication begins
2Productivity
If the terminal establishes a PDU session with a visited PLMN, then data communication is enabled, but session management complexity increases due to timer coordination and local release procedures
Solution Approach 1:
The session management process is segmented into distinct phases: PDU session establishment with the visited PLMN, timer-based session maintenance, and local release procedures. By dividing the complex session management into manageable segments with clear transition points, the terminal can efficiently handle data communication while reducing overall management complexity
Solution Approach 2:
The terminal implements dynamic timer management for PDU sessions in roaming mode. Timers are selectively started or stopped based on whether the terminal is in home or visited PLMN, allowing the system to adapt session management behavior to current operational context and reducing unnecessary complexity
3Reliability
If the terminal receives and validates roaming information from the AMF, then communication security is improved, but processing time increases due to verification procedures
Solution Approach 1:
The terminal performs preliminary validation of roaming information by checking PLMN identity and comparing against pre-stored authorized partner lists before establishing data communication. This preliminary action ensures security requirements are met early in the process, preventing time-consuming re-verification later while maintaining communication security
Solution Approach 2:
The terminal autonomously validates roaming information using its own stored authorization data without requiring continuous network verification. This self-service approach enables rapid local validation of PLMN authenticity, improving communication security while minimizing processing time by eliminating round-trip verification delays
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting higher data rates. A method performed by a UE includes transmitting, to a first VPLMN, a first registration request message; receiving, from the first VPLMN, a registration accept message including roaming information associated with an HPLMN; validating the roaming information; based on a result of the validating, setting a timer for releasing a PDU session with the first VPLMN; based on the timer, performing a local release for the PDU session with the first VPLMN; based on the roaming information, selecting a second VPLMN; and transmitting, to the second VPLMN, a second registration request message.