UDM Node Managing Redundant PDU Session Pairing
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Solution Overview
Problem
The existing 5G core network struggles to support high-speed, ultra-wide band services due to difficulty in accommodating low latency and high reliability requirements, particularly in scenarios like autonomous driving and factory automation, where conventional LTE networks fall short with latency exceeding 1 ms.
Innovation Solution
A method is introduced to manage redundant protocol data unit (PDU) sessions through a unified data management node, which receives and transmits redundancy sequence numbers and PDU session IDs between session management function nodes to ensure disjoint user plane paths for redundant PDU sessions, facilitating dual connectivity and improved network reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If redundant PDU sessions are managed by multiple SMF nodes independently, then each SMF can allocate redundancy sequence numbers autonomously, but the SMF nodes cannot identify the pairing relationship between redundant PDU sessions
Solution Approach 1:
The UDM node serves as an intermediary between multiple SMF nodes, centralizing the storage and management of PDU session pairing relationships. When an SMF node creates a redundant PDU session, it registers the pairing relationship with the UDM node. This intermediary approach allows SMF nodes to autonomously allocate RSNs while the UDM node maintains the global view of pairings, resolving the contradiction between autonomous operation and information availability.
2Device complexity
If the core network uses conventional LTE architecture, then the network structure is simple and well-established, but it cannot accommodate low latency and high reliability requirements for ultra-wide band services
Solution Approach 1:
The patent segments the session management function into multiple independent SMF nodes, each capable of autonomously managing PDU sessions. This segmentation allows the network to handle multiple services with different reliability and latency requirements simultaneously. The UDM node provides centralized coordination for redundant sessions, enabling the network to meet ultra-reliable low-latency communication requirements while maintaining architectural simplicity through functional separation.
Solution Approach 2:
The patent introduces new parameters including redundancy sequence numbers (RSN) and PDU session pair IDs to enable identification and management of redundant PDU sessions. These parameter changes allow the network to differentiate between primary and redundant sessions, track their pairing relationships, and manage them appropriately, thereby achieving high reliability and low latency for ultra-wide band services while building upon the existing LTE architecture.
Data Source
AI summary
One disclosure of the present specification provides a method for supporting redundant protocol data unit (PDU) sessions. The method may be performed by a unified data management (UDM) node and comprise: receiving, from a first session management function (SMF) node, a first message including a first redundancy sequence number (RSN) which is allocated by the first SMF node for managing a first PDU session and an identifier of the first PDU session; transmitting, to a second SMF node for managing a second PDU session, a second message including the first RSN and a PDU session pair ID, which is identical to the identifier of the first PDU session; and receiving, from the second SMF node, a third message including a second RSN which is allocated by the second SMF node and an identifier of the second PDU session. The second PDU session may be duplication of the first PDU session.