DAPS Bearer Configuration for Continuous Wireless Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively providing services without data interruption during handover processes, particularly in next-generation mobile communication systems like 5G, where efficient handover methods are needed to minimize data interruption time and support seamless service continuity.
Innovation Solution
The proposed solution involves configuring a dual active protocol stack (DAPS) bearer and a non-DAPS bearer for data radio bearers, with the PDCP entity indicating PDCP data volume to the MAC entity for the target base station and performing PDCP re-establishment as needed, allowing continuous data transmission and reception during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional handover method is used, then the handover process is simple, but data interruption occurs during handover
Solution Approach 1:
The terminal performs PDCP re-establishment before the actual handover execution, preparing the data transmission state in advance. This preliminary action ensures that when handover occurs, the data transmission can continue without interruption, resolving the contradiction between simple handover and service continuity.
Solution Approach 2:
The patent maintains continuous data transmission during handover by keeping the PDCP entity active and indicating PDCP data volume to the target base station. This continuity principle ensures that data transmission does not stop during the handover process, eliminating data interruption time while maintaining service reliability.
2Reliability
If dual active protocol stack bearer is configured, then data transmission continuity is improved, but device complexity increases
Solution Approach 1:
The patent segments the bearer configuration into two types: DAPS bearers for data transmission that require continuity, and non-DAPS bearers for other purposes. This segmentation allows the system to apply complex dual active protocol stack only where necessary, improving data transmission continuity while limiting the increase in device complexity to specific bearers rather than the entire system.
Solution Approach 2:
The dual active protocol stack is applied locally to specific DAPS bearers rather than globally to all bearers. This local quality approach ensures that data transmission continuity is improved for critical data bearers while the overall device complexity remains manageable by not applying the complex mechanism system-wide.
Data Source
AI summary
A method, performed by a terminal, in a wireless communication system is provided. The method includes receiving, from a source base station, a radio resource control (RRC) reconfiguration message for a handover, the RRC reconfiguration message configuring a first data radio bearer (DRB) as a dual active protocol stack (DAPS) bearer and a second DRB as a non-DAPS bearer, for the first DRB, in case that an uplink data switching is requested from an upper layer, indicating, by a packet data convergence protocol (PDCP) entity for the DRB, a PDCP data volume excluding a PDCP Control protocol data unit (PDU) associated with the source base station, to a medium access control (MAC) entity for a target base station, and for the second DRB, in case that an indication of PDCP re-establishment is set, performing a PDCP re-establishment for the second DRB.