PDCP DAPS Handover for Zero-Interruption 5G Data Transfer
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Solution Overview
Problem
There is a need for an efficient handover method in next-generation mobile communication systems to support services with no data interruption and low transmission delay.
Innovation Solution
The method involves a dual active protocol stack (DAPS) handover, where a terminal performs a random access procedure with a target base station using a first message to configure a data radio bearer (DRB) as a DAPS bearer, and transmits a PDCP status report if triggered, while maintaining data transmission with both the source and target base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal performs a random access procedure with a target base station during handover, then the handover connection is established, but data transmission interruption occurs during the handover process
Solution Approach 1:
The terminal performs a random access procedure with the target base station before fully disconnecting from the source base station. This preliminary action establishes the handover connection in advance, allowing data transmission to continue through the source base station until the handover is complete, thereby eliminating data transmission interruption.
Solution Approach 2:
The terminal maintains dual active protocol stacks that allow simultaneous data transmission with both source and target base stations during handover. This continuity of useful action ensures that data transmission never stops, as the terminal can switch between base stations without interruption.
2Speed
If a terminal switches from source base station to target base station, then handover is completed, but data transmission/reception interruption occurs
Solution Approach 1:
The terminal performs the random access procedure with the target base station before switching data transmission from the source to the target base station. This preliminary action ensures the target base station is ready to immediately take over data transmission, eliminating any interruption during the switch.
Solution Approach 2:
The terminal dynamically maintains multiple active protocol stacks (dual active) during handover, allowing flexible switching between source and target base stations. This dynamic approach enables the terminal to complete handover quickly while maintaining continuous data transmission through appropriate stack selection.
3Reliability
If a terminal maintains connection with both source and target base stations, then data transmission continuity is achieved, but device complexity increases
Solution Approach 1:
The terminal segments its protocol stacks into multiple independent instances (first and second protocol stacks), each capable of operating with different base stations. This segmentation allows the terminal to maintain connections with both source and target base stations simultaneously while managing complexity through modular, independent stack instances.
Data Source
AI summary
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security, and safety services. The disclosure provides a method and an apparatus for operating a PDCP entity during a handover having no transmission/reception interruption.