DAPS Handover SDAP Reconfiguration for Seamless 5G Service Continuity
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Solution Overview
Problem
Current wireless communication systems, particularly 5G, face challenges in providing seamless service continuity during handovers without data interruption, which is critical for maintaining service quality in next-generation mobile communication systems.
Innovation Solution
The implementation of a method and apparatus that utilize a dual active protocol stack (DAPS) handover technique, where a terminal in a wireless communication system receives RRC reconfiguration messages including DRB configuration information and SDAP configuration, allowing for efficient handover by reconfiguring protocol entities, thereby minimizing data interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal performs handover from source base station to target base station in conventional wireless communication systems, then the terminal can maintain connection with the network, but data transmission is interrupted during the handover process
Solution Approach 1:
The terminal performs random access to the target base station and receives SDAP configuration information before completing the handover. The SDAP entity is reconfigured in advance with QoS flow to data radio bearer mapping information, so that when handover is completed, data transmission can continue without interruption. This preliminary configuration action eliminates the data interruption that normally occurs during handover.
2Reliability
If the terminal reconfigures SDAP entity with QoS flow to data radio bearer mapping information, then data transmission continuity is maintained, but the complexity of protocol layer configuration increases
Solution Approach 1:
The SDAP (Service Data Adaptation Protocol) entity acts as an intermediary layer between the QoS management function and the data radio bearer. By introducing this intermediate configuration layer with specific mapping information, the system maintains data continuity while managing the complexity through a dedicated protocol entity that handles QoS flow to bearer mapping, rather than requiring complex reconfiguration across multiple protocol layers.
3Speed
If the terminal maintains connection with source base station and performs random access to target base station simultaneously, then handover is completed faster, but the risk of handover failure increases
Solution Approach 1:
The terminal performs random access to the target base station and receives necessary configuration information (SDAP configuration) before the handover is officially completed. This preliminary action ensures that the terminal is fully prepared to maintain data transmission with the target base station, reducing the risk of handover failure while maintaining fast handover completion through dual active protocol stack operation.
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 including data radio bearer (DRB) configuration information, wherein the DRB configuration information includes an identifier of a DRB and an indicator for a dual active protocol stack (DAPS) handover, and in case that the DRB configuration information includes service data adaptation protocol (SDAP) configuration information, and completion of a random access to a target base station is indicated by a target medium access control (MAC) entity for the target base station, reconfiguring a SDAP entity based on the SDAP configuration information.