Redundant PDU Session Pairing for 5G Dual Connectivity
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Solution Overview
Problem
Existing 5G network technologies lack mechanisms for efficient and scalable management of redundant PDU sessions for ultra-reliable low-latency communication (URLLC), particularly in handling redundant user plane requirements, session pair information, and dynamic traffic duplication/elimination, leading to inefficiencies in dual connectivity scenarios.
Innovation Solution
Implement policies and parameters provisioned by PCF to SMF for redundant transmission configuration, with UE providing PDU session pair information to enable dual connectivity, and enhance URSP rules for traffic duplication and elimination at the PDU layer, allowing dynamic management of redundant transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant PDU sessions are established for URLLC applications, then reliability is improved, but device complexity and network configuration complexity increase
Solution Approach 1:
The patent implements traffic duplication by creating redundant copies of PDU sessions through the PCF and SMF. The PCF generates multiple PCC rules that direct the same traffic through different PDU sessions, effectively copying the traffic flow to ensure reliability. This allows the system to maintain multiple identical transmission paths without requiring complex manual configuration at each device level.
Solution Approach 2:
The PCF acts as an intermediary that automatically manages the complexity of redundant session configuration. Instead of requiring direct configuration at the UE or application level, the PCF receives policy inputs, generates appropriate PCC rules, and coordinates with the SMF to establish redundant PDU sessions. This intermediary layer abstracts the complexity from end devices while maintaining reliability.
2Reliability
If multiple PDU sessions are configured for redundant transmission, then reliability is improved, but ease of operation deteriorates due to complex session management
Solution Approach 1:
The system implements self-service through automated policy-driven session management. The PCF automatically generates PCC rules based on policy inputs, and the SMF automatically establishes and manages the redundant PDU sessions without requiring manual intervention. The system self-configures the redundant transmission paths, making operation easier despite the complexity of having multiple sessions.
Solution Approach 2:
The patent incorporates feedback mechanisms where the PCF monitors traffic patterns and session status, automatically adjusting PCC rules and session configurations as needed. This feedback loop ensures that redundant sessions are maintained and managed optimally without requiring continuous manual operation, improving ease of use while maintaining reliability.
3Adaptability or versatility
If dynamic traffic duplication is implemented at PDU layer, then adaptability is improved, but device complexity increases
Solution Approach 1:
The PCF serves as an intermediary that handles the complexity of dynamic traffic duplication decisions. Based on policy inputs and network conditions, the PCF dynamically generates or modifies PCC rules to enable or disable duplication at the PDU layer. This allows adaptability in traffic handling while the PCF absorbs the complexity of decision-making, preventing it from propagating to end devices.
Solution Approach 2:
The system achieves adaptability by dynamically changing parameters in the PCC rules generated by the PCF. When duplication is needed, the PCF modifies rule parameters to create additional transmission paths; when not needed, it simplifies the rules. This parameter-based control enables flexible adaptation to different traffic conditions without requiring complex device-level configurations.
Data Source
AI summary
Policies and parameters support redundant transmission configurations using dual connectivity. A WTRU receives URSP rules configured to determine that application traffic is to associated with redundant transmissions via at least two PDU sessions. The URSP rules include a first URSP rule comprising a first traffic descriptor and a first route selection descriptors (RSD), and a second URSP rule comprising a second traffic descriptor and a second RSD. The WTRU sends a first PDU session establishment message configured to establish a first PDU session based on the first URSP rule. The first PDU session establishment message comprises PDU session pair information (PSPI). The WTRU sends a second PDU session establishment message configured to establish a second PDU session. The second PDU session establishment message comprises the PSPI. The PSPI is configured to indicate that the first PDU session and the second PDU session are associated with redundant application traffic.