Per-Session PDU Continuity Across 5G Mobility Re-Establishment
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Solution Overview
Problem
Existing 5G wireless networks face challenges in providing seamless service continuity for mobile devices, particularly in scenarios involving high-speed mobility and session re-establishment, as they lack efficient methods for maintaining service and session continuity on a per-session basis.
Innovation Solution
A method and system are introduced for session continuity in 5G wireless networks, where a wireless transmit receive unit (WTRU) receives a NAS message indicating PDU session re-establishment, generates new and old PDU session IDs, and transmits these IDs to an Access Mobility Function (AMF) and an Access Mobility Function (AMF) and an Access Mobility Function (AMF) and an Access Mobility Function (AMF) and an Access Mobility Function (AMF) where the SM message of the PDU session establishment request may be routed to the SMF. Upon receiving the PDU session establishment request, the SMF determines the association of old and new PDU sessions, enabling session re-establishment and new session creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 5G networks support a large number of moving devices with high mobility, then mobility coverage is improved, but service continuity and session re-establishment reliability deteriorate
Solution Approach 1:
The patent segments the session management process into distinct phases: active session, suspension, and re-establishment. Each phase is managed separately with specific NAS messages and state transitions, allowing the system to handle high mobility scenarios while maintaining service continuity through structured session lifecycle management.
Solution Approach 2:
The patent implements preliminary actions by establishing session suspension capabilities before mobility events occur. The network can proactively suspend sessions and prepare re-establishment procedures, ensuring that when high-speed mobility events happen, the service continuity is maintained through pre-configured session states and identifiers.
2Reliability
If session re-establishment procedures are implemented for mobile devices, then service continuity is improved, but network signaling complexity increases
Solution Approach 1:
The patent creates a universal session management framework that handles multiple scenarios (high-speed mobility, handover, network reconfiguration) through a single set of NAS messages and state transition procedures. This multi-functional approach reduces overall signaling complexity by avoiding separate procedures for each scenario while maintaining service continuity across diverse mobility conditions.
Solution Approach 2:
The patent uses session identifier copying and reference mechanisms where the SMF retains references to suspended sessions and uses these references during re-establishment. This copying approach allows the network to maintain session state without duplicating full session data, reducing signaling overhead while ensuring service continuity.
3Measurement precision
If per-session mobility management is implemented, then session continuity precision is improved, but control plane processing complexity increases
Solution Approach 1:
The patent implements local quality by applying per-session mobility management where each PDU session is independently managed with its own state, identifiers, and re-establishment procedures. This allows precise control over session continuity for each individual session while using standardized NAS message formats that prevent control plane processing complexity from becoming unmanageable.
Data Source
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AI summary
A wireless transmit receive unit (WTRU) may determine, based on configuration information received from a network device, a service session continuity, SSC, mode for an application, wherein the configuration information includes mapping information between the application and the SSC mode. The WTRU may then transmit, based on the determined SSC mode being different than an SSC mode associated with an existing Protocol Data Unit, PDU, session, a PDU session establishment request with the determined SSC mode for a new PDU session to be associated with the application.