5G PDU Session Rejection Handling for IoT Connectivity
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Solution Overview
Problem
5G networks face challenges in establishing and maintaining non-IP data connections, particularly for IoT devices, due to limited support and operator configuration restrictions, leading to service interruptions and connectivity issues.
Innovation Solution
The implementation of methods and apparatuses that analyze rejection causes for PDU session establishment requests in 5G networks, allowing re-attempts based on specific criteria such as switching to different access types or data networks, thereby ensuring continuity of services for Ethernet and unstructured data connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network supports non-IP data connections for IoT devices, then connectivity versatility is improved, but network complexity increases due to limited support for Ethernet and unstructured PDU session types
Solution Approach 1:
The patent changes the parameter of PDU session type from traditional IP-based sessions to non-IP types (Ethernet and unstructured), enabling diverse connectivity options for IoT devices while maintaining network compatibility through standardized handling procedures
Solution Approach 2:
The network is designed to handle multiple PDU session types (IP, Ethernet, unstructured) through a universal session management mechanism, allowing a single network infrastructure to support diverse connectivity requirements without requiring separate specialized systems
2Ease of operation
If operator configuration restricts non-IP data connections to subset of network functions, then network control is improved, but service reliability deteriorates due to connection establishment failures
Solution Approach 1:
The patent implements a feedback mechanism where the UE receives rejection cause information from the network and uses this feedback to determine appropriate re-attempt strategies, such as switching access types or selecting alternative data networks, thereby maintaining service reliability under operator restrictions
Solution Approach 2:
The connection establishment process becomes dynamic with conditional re-attempts based on rejection causes. The UE can adaptively switch between different access types (3GPP/non-3GPP) and data networks based on network responses, transforming a static restricted configuration into a flexible resilient system
3Ease of operation
If UE subscription restricts data connectivity types, then service management is improved, but connectivity availability worsens due to failed connection establishment
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple potential data networks and access types before connection attempts. When a connection is rejected, the UE can immediately switch to pre-planned alternative configurations, ensuring connectivity availability while respecting subscription restrictions
4Power
If the network rejects PDU session establishment requests for non-IP types, then network resource management is improved, but data connectivity continuity deteriorates
Solution Approach 1:
The patent ensures continuity of useful action through automated re-attempt mechanisms. When non-IP PDU session establishment is rejected, the UE continuously attempts re-connection using alternative strategies (different access types, different data networks) until successful connection is achieved, maintaining uninterrupted data connectivity
Data Source
AI summary
A method, apparatus and computer program product are provided herein for handling rejection cases related to Protocol Data Unit (PDU) session establishment. For example, a method is provided that comprises causing transmission of a PDU session establishment request message for a PDU session of a data session type to a data network, receiving a response message to the PDU session establishment request message indicating that the PDU session establishment request for the PDU session of the data session type to the data network is rejected, wherein the response message comprises a rejection cause, and analyzing the rejection cause to identify re-attempt criteria for transmission of a further PDU session establishment request message for a PDU session of a further data session type or to a further data network.