UE PDU Session Handover Between 3GPP and Non-3GPP Access
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Solution Overview
Problem
Current 4G LTE networks are insufficient to support services requiring high reliability and low latency, such as autonomous driving and virtual realities, due to delays exceeding 1 ms.
Innovation Solution
The proposed solution involves a method for handover between 3GPP access and trusted non-3GPP access, using a specific PDU session ID and EAP messages to facilitate the handover process, allowing for seamless transition of PDU sessions between different access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 4G LTE network is used, then wide area coverage is achieved, but delay time exceeds 1 ms which is insufficient for URLLC services
Solution Approach 1:
The patent segments the access network into multiple types (3GPP access and non-3GPP access) to handle different service requirements. By dividing the access options, the system can select appropriate access types for different services, enabling URLLC services to use non-3GPP access for lower latency while maintaining 3GPP access for wide coverage.
Solution Approach 2:
The patent implements dynamic access type selection and handover mechanisms that allow the system to adaptively switch between 3GPP and non-3GPP access types based on service requirements. The network can dynamically determine the appropriate access type for each PDU session and perform handovers when needed, making the system flexible enough to meet both wide coverage and low latency requirements.
2Adaptability or versatility
If multiple access types are supported, then service versatility is improved, but device and network complexity increases
Solution Approach 1:
The patent performs preliminary actions by determining the access type for each PDU session before actual data transmission begins. The network determines whether to use 3GPP or non-3GPP access in advance, and the UE is notified of the selected access type. This preliminary determination simplifies subsequent operations by avoiding the need for complex real-time decision-making during data transmission.
Solution Approach 2:
The patent introduces the AMF (Access and Mobility Management Function) as an intermediary that manages the complexity of multi-access type handling. The AMF receives PDU session establishment requests, determines the appropriate access type, and coordinates with other network functions. This intermediary abstracts the complexity from the UE and simplifies the overall system architecture.
3Stability of the object's composition
If PDU session handover between access types is enabled, then service continuity is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the access type determination logic from the PDU session establishment procedure into a separate, dedicated step. The network determines the access type independently and notifies the UE through a specific indication in the acceptance message. This extraction reduces signaling overhead by avoiding redundant information exchange and streamlining the handover process.
Data Source
AI summary
Provided in one disclosure of the present specification is a user equipment (UE) for establishing a Protocol Data Unit (PDU) session. The UE may include: a transmission and reception unit; and a processor for controlling the transmission and reception unit. The processor may perform: a step for assessing whether there is a possibility of the PDU session being handed over to a non-3rd Generation Partnership Project (non-3GPP) access; a step for determining the ID of the PDU session according to the assessment; and a step for transmitting a message including the determined ID of the PDU session.