PDU Session Transfer Rules for CIoT Across 3GPP and Non-3GPP
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Solution Overview
Problem
Existing technologies lack clear rules and behaviors for transferring Protocol Data Unit (PDU) sessions across different access types in Cellular Internet of Things (CIoT) optimizations, leading to unpredictable UE and network behavior.
Innovation Solution
Define specific rules and checks for determining whether PDU sessions can be transferred between 3GPP and non-3GPP access based on Control Plane (CP) indication, ensuring consistent UE and network behavior by enforcing transfer conditions for CIoT optimizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PDU session transfer between 3GPP and non-3GPP access is allowed without clear rules, then access flexibility and adaptability are improved, but system reliability and stability deteriorate due to unpredictable UE and network behavior
Solution Approach 1:
The patent applies parameter changes by introducing specific conditions and parameters that must be satisfied for PDU session transfer: the target access type must be different from the current access type, and if CIoT optimization is used, the PDU session must not be a control plane only session. These parameter-based rules transform the ambiguous transfer process into a deterministic decision-making process, resolving the contradiction between flexibility and stability.
2Reliability
If PDU session transfer rules are strictly defined for CIoT optimization, then system reliability is improved, but device complexity increases due to additional determination steps
Solution Approach 1:
The patent applies preliminary action by performing the CIoT optimization check and control plane only session verification before allowing PDU session transfer. The UE and network determine whether CIoT optimization is used and whether the PDU session is control plane only in advance, before the transfer decision is made. This preliminary determination simplifies the overall process by eliminating ambiguous scenarios upfront.
Solution Approach 2:
The patent segments the PDU session transfer determination into distinct decision steps: first checking if the target access type is different, then checking if CIoT optimization is used, and finally checking if the PDU session is control plane only. This segmentation transforms a complex undifferentiated decision process into manageable discrete steps, reducing overall system complexity while maintaining reliability.
3Adaptability or versatility
If PDU session transfer is permitted across all access types, then network adaptability is improved, but service reliability deteriorates due to potential service failures
Solution Approach 1:
The patent applies preliminary anti-action by proactively preventing PDU session transfers that would lead to service failures. Specifically, when CIoT optimization is used and the PDU session is control plane only, the transfer is blocked in advance. This prevents the harmful scenario where control plane only sessions would fail after transfer to non-3GPP access, thereby maintaining service reliability while still allowing flexible transfers for other session types.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Disclosed is a method of determining, in a User Equipment, if a PDU session between the UE and a network, can be transferred between 3GPP and non-3GPP access, when the UE is using a Cellular Internet of Things, CIoT, optimisation, wherein the determination is performed on the basis of a Control Plane, CP, only indication and if the determination is positive, then the PDU session is not transferred.