PSCell Activation Early Data Forwarding Handover Delay
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Solution Overview
Problem
Conventional handover procedures in 5G NR networks face challenges in Ultra-Reliable and Low-Latency Communications due to delays in the rigid configuration process, leading to potential handover failures and service interruptions, especially with Dual Connectivity techniques, where data synchronization and buffer management are inadequate.
Innovation Solution
Implementing a deferred access and data synchronization method during handover, where the user equipment (UE) receives a pre-configuration message before moving into the target node's coverage area and only accesses the target node upon receiving an activation command, allowing for earlier data preparation and synchronization between the source and target nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional handover procedure is used, then the configuration process is simple, but handover delays occur and handover success rate decreases
Solution Approach 1:
The patent applies preliminary action by performing handover configuration preparation in advance. The source node sends a handover pre-configuration message to the UE before the actual handover execution, including target node configuration information. This allows the UE to prepare configuration parameters beforehand, reducing the time required during actual handover execution and improving handover success rate.
Solution Approach 2:
The handover procedure is segmented into distinct phases: configuration phase (receiving pre-configuration message), execution phase (receiving activation command and performing handover), and data forwarding phase. This segmentation allows each phase to be optimized independently, with configuration happening beforehand and execution being rapid, thereby reducing overall handover delay.
2Speed
If Dual Connectivity technique is implemented, then traffic latency is reduced, but data synchronization and buffer management become complex
Solution Approach 1:
The patent uses the source node as an intermediary to manage data synchronization between the target node and UE. The source node sends data to be forwarded to the target node via the target node, which buffers and forwards this data to the UE after handover. This intermediary mechanism simplifies buffer management by centralizing control at the source node while enabling low-latency dual connectivity operation.
Solution Approach 2:
Data forwarding is performed in advance during the configuration phase. The source node identifies data that needs to be forwarded and sends it to the target node before handover completion. The target node buffers this data and prepares it for transmission to the UE, ensuring continuous data flow and reducing latency during the handover transition.
Data Source
AI summary
According to one aspect of the present disclosure, a method for handover in a radio access network is provided, wherein the method includes receiving, by a user equipment (UE), a handover pre-configuration message from a source node serving the UE in the radio access network, the handover pre-configuration message including handover information of a target node in the radio access network, receiving, by the UE, an activation command from the source node after receiving the handover pre-configuration message, and transmitting, by the UE, an access request message to the target node in accordance with the handover information in response to receiving the activation command.