Data Forwarding Addressing for 5G SDT Mobility Handover
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Solution Overview
Problem
Existing communication networks face challenges in efficiently handling small data transmissions and mobility scenarios, particularly in 5G networks, where anchor relocation can lead to data loss and increased latency due to inefficient data forwarding mechanisms.
Innovation Solution
Implementing data forwarding mechanisms that utilize logical channel identifiers (LCIDs) and context retrieval requests to manage data transmission during anchor relocation, ensuring seamless data transfer between base stations and minimizing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If anchor relocation is performed in 5G networks during mobility events, then network flexibility and mobility support are improved, but data loss and latency increase due to inefficient data forwarding mechanisms
Solution Approach 1:
The source anchor base station forwards data packets to the target anchor base station before the handover is completed. This preliminary data forwarding ensures that data is already available at the target station when the UE connects, preventing data loss and reducing latency during the mobility event.
Solution Approach 2:
The source anchor base station acts as an intermediary by receiving data from the UPF and forwarding it to both the UE directly and to the target anchor base station. This intermediary role enables seamless data transfer during anchor relocation without requiring the UE to maintain a direct connection throughout the handover process.
2Device complexity
If traditional data forwarding mechanisms are used during anchor relocation, then implementation simplicity is maintained, but data transmission efficiency decreases and data loss occurs
Solution Approach 1:
Data is forwarded to the target anchor base station in advance of the handover completion. This preliminary action ensures data availability at the target station without requiring complex real-time data routing during the handover, thus improving efficiency while maintaining reasonable implementation complexity.
Solution Approach 2:
The handover confirmation message serves as feedback that triggers the data forwarding process. When the source anchor base station receives the handover confirmation from the target anchor base station, it initiates the data forwarding to ensure seamless continuity, improving transmission efficiency through event-driven optimization.
3Reliability
If data forwarding is initiated after handover confirmation, then data accuracy is ensured, but transmission speed decreases due to delayed forwarding
Solution Approach 1:
Data forwarding is initiated before the handover is fully complete, based on the handover request message. This preliminary action ensures that data transmission begins earlier without compromising accuracy, as the source anchor base station maintains control and can ensure proper data delivery during the transition period.
Data Source
AI summary
A method can include receiving, by a first base station from a wireless device uplink data associated with a first radio bearer configured for a small data transmission (SDT) procedure; and a radio resource control resume request message. The method can also include sending, by the first base station to a second base station, a first message requesting to retrieve a wireless device context of the wireless device. The method can further include receiving, by the first base station from the second base station, a second message indicating not to relocate the wireless device context of the wireless device, indicating the first radio bearer configured for the SDT procedure, and indicating a data forwarding address for uplink data associated with the first radio bearer.