Conditional Handover PDCP Status Report for 5G Wireless Systems
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Solution Overview
Problem
In 5G communication systems, the current handover procedures face challenges such as late data forwarding from the source gNB to the target gNB and failure to recognize the connection release time of a UE, leading to data interruption and transmission delays.
Innovation Solution
A conditional handover method is proposed, where the source gNB sets conditions for multiple target gNB candidates, allowing the UE to select the optimal target gNB based on signal strength, and triggers a PDCP status report to ensure seamless data transfer during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover procedures are used, then the handover process is simple, but data interruption and transmission delays occur due to late data forwarding and failure to recognize connection release time
Solution Approach 1:
The source gNB performs data forwarding to the target gNB before the UE actually completes the handover, based on predicted handover timing. This preliminary data forwarding ensures that data is already available at the target gNB when the UE arrives, eliminating data interruption and transmission delays while maintaining reliable data transfer.
2Reliability
If conditional handover with multiple target gNB candidates is implemented, then handover reliability improves, but device complexity increases
Solution Approach 1:
The UE autonomously selects the optimal target gNB from multiple candidates based on signal strength measurements and predefined selection criteria. This self-service approach allows the system to evaluate multiple handover options and select the best one without requiring complex centralized control, thereby improving handover reliability while keeping the procedure manageable.
Solution Approach 2:
The system implements feedback mechanisms where the UE continuously monitors signal conditions and reports measurements to the source gNB. Based on this feedback, the source gNB can adjust handover conditions and data forwarding timing dynamically, ensuring reliable handover execution while maintaining controlled complexity through information-driven decision making.
Data Source
AI summary
A method performed by a terminal in a wireless communication system includes: receiving, from a base station, a radio resource control (RRC) reconfiguration message including configuration information for conditional handover; identifying a cell for conditional handover based on the configuration information for conditional handover; and triggering a packet data convergence protocol (PDCP) status report for a radio bearer, according to an execution of a conditional handover for the identified cell for conditional handover.