Master Node Data Forwarding in 5G SN Change
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Solution Overview
Problem
Current 5G core network (5GC) operations involving secondary node (SN) changes in multi-RAT dual connectivity (MR-DC) face issues such as delayed data forwarding intentions from the source SN and challenges in maintaining DRB-level continuity, leading to potential packet loss and service interruptions.
Innovation Solution
Implementing a mechanism where the master node (MN) requests and reflects the data forwarding intentions of the source SN before initiating a change to the target SN, and requires the source SN to follow data forwarding instructions, including reporting DRB mapping for SN-terminated bearers using secondary cell group resources, to ensure seamless data forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the master node initiates SN change without requesting forwarding intentions from source SN first, then the change process is simpler and faster, but data forwarding is delayed causing packet loss and service interruptions
Solution Approach 1:
The master node requests forwarding intentions from the source SN before initiating the SN change. This preliminary action ensures that data forwarding arrangements are made in advance, preventing packet loss and service interruptions while maintaining an efficient change process
2Adaptability or versatility
If the source SN is not required to follow data forwarding instructions, then the source SN has more operational flexibility, but data forwarding consistency and continuity cannot be guaranteed
Solution Approach 1:
The source SN reports its forwarding intentions to the master node, creating a feedback mechanism. The master node then provides binding instructions that ensure consistent data forwarding across all nodes, maintaining both operational awareness and forwarding reliability
3Device complexity
If DRB mapping for SN-terminated bearers is not reported, then the signaling overhead is reduced, but DRB-level continuity cannot be maintained during SN change
Solution Approach 1:
The source SN reports DRB mapping information to the master node before the SN change is executed. This preliminary reporting ensures that all necessary mapping information is available in advance, enabling seamless DRB-level continuity during the handover while minimizing signaling overhead through efficient information exchange
Data Source
AI summary
Apparatuses, systems, and methods for a network node to inter-connect with a first secondary node (SN) within a core network. The network node may be a master node and may serve a UE. The first SN may be a source SN. The network node may initiate a change from the first SN to a second SN, which may be a target SN. The network mode may determine data forwarding from the first SN to the second SN and may request, from the first SN, data forwarding intentions prior to initiating the change from the first SN to a second first SN to the second SN. The network node may send, to the first SN, data forwarding instructions (e.g., based, at least in part, on the data forwarding intentions of the first SN) and the data forwarding instructions may include a requirement for the first SN to follow the data forwarding instructions.