Dual Active Protocol Stack Handover for Wireless Communication Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in seamlessly supporting handover services for user equipment (UE) in mobile communication systems, particularly in minimizing data transmission interruption time during handover.
Innovation Solution
The proposed solution involves an operating method for UE in a wireless communication system, which includes receiving configuration information from a source base station, determining if Dual Active Protocol Stack (DAPS) handover is configured, maintaining a link to the source BS, performing DAPS handover on a target BS, suspending and reconfiguring Signaling Radio Bearers (SRBs), and handling failures by determining radio link failures and reporting handover failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedure is used, then handover service is provided, but data transmission interruption time increases
Solution Approach 1:
The patent applies preliminary action by maintaining the source base station link active during the handover process to the target base station. The UE keeps the source link established and only releases it after successful handover completion, thereby preparing for seamless transition and minimizing data transmission interruption time.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining data transmission through the source base station link during the handover process. The UE continues to transmit and receive data via the source link until handover is fully completed, ensuring uninterrupted service continuity and eliminating data transmission interruptions.
2Loss of time
If Dual Active Protocol Stack handover is implemented, then data transmission interruption time is minimized, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the protocol stack into separate source and target base station protocol stacks. The UE maintains independent protocol stacks for both source and target base stations during handover, allowing parallel operation and reducing the complexity of managing a single complex stack while enabling seamless transition.
3Reliability
If link to source base station is maintained during handover, then service continuity is ensured, but signal management complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE to maintain the source base station link active during handover. The source link is kept established before, during, and immediately after the handover process, with the link release scheduled only after successful handover completion, thereby ensuring service continuity while simplifying signal management through predetermined timing.
Data Source
AI summary
An operating method of a user equipment (UE) in a wireless communication system according to an embodiment of the disclosure may include receiving configuration information from a source base station (BS), determining, based on the configuration information, whether Dual Active Protocol Stack (DAPS) handover is configured for at least one bearer, based on a result of the determining, maintaining a link to the source BS, performing the DAPS handover on a target BS, suspending a Signaling Radio Bearer (SRB) configured for the source BS, and establishing a SRB for the target BS, when it is determined that the DAPS handover fails, determining whether a radio link failure (RLF) occurs in the link to the source BS, and based on a result of the determining, when the RLF does not occur in the link to the source BS, resuming the SRB configured for the source BS and reporting the failure of the DAPS handover.