5G-to-EPS PDU Session Continuity Through State Comparison
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Solution Overview
Problem
When a user equipment (UE) performs a fallback from a 5th generation (5G) communication system to an evolved packet system (EPS) and then returns to the 5G system, some PDU sessions are likely to be lost or changed, leading to the inability to use these sessions effectively.
Innovation Solution
An electronic device is configured to store information related to PDU sessions before the fallback, compare this information with sessions established after returning to the 5G system, and establish or modify sessions based on the comparison results, ensuring continuity of PDU session usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs fallback from 5G to EPS and then returns to 5G, then the UE can access services in both networks, but the PDU sessions established before fallback are likely to be lost or changed
Solution Approach 1:
The UE stores information about PDU sessions established before fallback in a buffer memory before leaving the 5G network. This preliminary action ensures that session information is preserved and can be used to restore sessions after returning to 5G, preventing session loss during the fallback process.
Solution Approach 2:
After returning to the 5G network, the UE compares the currently established PDU sessions with the stored session information from before fallback. This feedback mechanism identifies discrepancies and triggers session establishment or modification operations to restore the original session configuration, ensuring session continuity.
2Reliability
If the UE stores and compares PDU session information before and after fallback, then session continuity can be maintained, but the device complexity increases
Solution Approach 1:
The UE autonomously manages the PDU session information without requiring external network assistance. The device independently stores session information in its buffer, performs self-comparison with current sessions after fallback, and automatically initiates session establishment or modification operations, reducing the need for complex network-side coordination.
Solution Approach 2:
The UE creates a copy of the PDU session information from before fallback and stores it in a buffer memory. This copy is then used for comparison with current sessions after fallback, allowing the device to identify and restore necessary sessions without permanently altering the original session data or requiring complex real-time synchronization mechanisms.
Data Source
AI summary
An electronic device is provided. The electronic device includes at least one processor, which may be configured to establish at least one first protocol data unit (PDU) session in a state of being registered in a 5th generation system (5GS), store first information related to the at least one first PDU session, perform a procedure for registering with an evolved packet system (EPS), based on at least one first trigger causing a system fallback from the 5GS to the EPS, perform a procedure for registering with the 5GS, based on at least one second trigger causing a return to the 5GS, compare second information related to a second PDU session, with the first information, perform an operation of establishing, a third PDU session when the third PDU session not comprised in the second PDU session is identified, and perform an operation of modifying, a fourth PDU session.