Visited Session Breakout for Home-Routed 5G Roaming Sessions
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Solution Overview
Problem
In 5G communication systems, managing session breakout for roaming user equipment (UE) in visited PLMN networks is complex due to the need for two PDU sessions and complicated UE route selection policies, especially when handovers occur, leading to increased signaling load and decreased scalability.
Innovation Solution
A method and device are provided to support session breakout by adding, modifying, or deleting local UPFs in the visited network for home-routed sessions, enabling simultaneous access to both local and home data networks using an uplink classifier (ULCL) and branching point (BP) technology, allowing a VSBO session to be managed efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two PDU sessions are required for handover in roaming situation, then session continuity is maintained, but device complexity and signaling load increase
Solution Approach 1:
The patent merges the home routed session and visited network session into a single PDU session by introducing a visited session breakout (VSBO) indicator. This allows the UE to maintain session continuity during handover between home and visited PLMN without requiring separate PDU sessions, thereby reducing device complexity and signaling load while preserving reliability
2Adaptability or versatility
If two PDU sessions are used with multiple DNNs, then access to both local and home data networks is enabled, but ease of operation decreases
Solution Approach 1:
The patent implements self-service by automatically determining whether to establish a home routed or visited network session based on the VSBO indicator and network conditions. The system automatically selects the appropriate data network (local or home) without requiring manual UE intervention or complex route selection policies, thereby maintaining adaptability while improving ease of operation
3Reliability
If home routed session is used in visited PLMN, then access to home data network is ensured, but productivity decreases due to additional signaling
Solution Approach 1:
The patent applies preliminary action by pre-configuring the VSBO indicator in the network to indicate whether visited session breakout is allowed. This allows the UE to quickly determine the appropriate session type without extensive signaling exchanges during handover, thereby maintaining reliable access to home data network while improving session establishment efficiency and reducing signaling overhead
Data Source
AI summary
The disclosure relates to a 5G communication system communication scheme and a system thereof to support a higher data rate than that of the 4G system. In a wireless communication system, a method is provided that is performed by a first entity configured to manage a protocol data unit session in a wireless communication system that includes receiving, from a second entity, a session management-related request message including a visited session breakout (VSBO) allowed indicator; determining whether to create a VSBO session based on the session management-related request message; transmitting a session create request message to a third entity; and receiving, from the third entity, a session create response message including whether to allow a VSBO.