DAPS Handover Bearer Handling for Error-Free Data Continuity
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Solution Overview
Problem
In next-generation mobile communication systems, the dual active protocol stack (DAPS) handover method for maintaining data transmission during handover is prone to errors, leading to potential data interruptions.
Innovation Solution
A method and device that manage DAPS handover by configuring dual protocol stacks for bearers, allowing simultaneous data transmission with both source and target base stations, and switching seamlessly upon successful random access to the target station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DAPS handover method is used to maintain data transmission during handover, then data continuity is improved, but error susceptibility increases leading to potential data interruptions
Solution Approach 1:
The patent segments the bearer handling into two distinct categories: bearers configured with DAPS handover and bearers not configured with DAPS handover. This segmentation is implemented through separate configuration lists (first bearer list for DAPS, second bearer list for non-DAPS) and distinct processing paths in the MAC layer. By dividing the bearer management into separate segments, the patent prevents errors from propagating across all bearers and enables selective application of error prevention measures specific to each segment.
Solution Approach 2:
The patent applies partial action by selectively discarding MAC PDUs only for bearers not configured with DAPS handover, while maintaining normal processing for bearers configured with DAPS handover. This partial application of the discard action prevents unnecessary data loss for DAPS-configured bearers while still protecting non-DAPS bearers from potential errors during the handover transition period.
2Reliability
If dual protocol stacks are configured for simultaneous data transmission with source and target base stations, then handover seamlessness is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by configuring DAPS handover parameters selectively for specific bearers rather than uniformly across all bearers. Each bearer can be independently configured with or without DAPS handover based on its specific requirements, allowing the system to optimize for seamless handover where needed while reducing complexity for bearers that don't require it. This is implemented through separate bearer configuration lists and bearer-specific MAC PDU handling.
3Reliability
If MAC PDU is discarded for bearers not configured with DAPS handover, then error prevention is improved, but data loss risk increases
Solution Approach 1:
The patent implements feedback mechanisms through HARQ (Hybrid Automatic Repeat Request) for bearers not configured with DAPS handover. When MAC PDUs are discarded or potentially lost, the HARQ feedback system enables retransmission requests to be sent back to the source base station, allowing the system to recover from data loss events. This feedback loop transforms the potentially harmful data loss into a recoverable condition, maintaining overall reliability.
Data Source
AI summary
The present disclosure relates to: a communication technique for convergence of IoT technology and a 5th generation (5G) or a pre-5G communication system for supporting a higher data transmission rate than a 4th generation (4G) communication system such as Long Term Evolution (LTE); and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security- and safety-related services, and the like) on the basis of 5G communication technology and IoT-related technology. According to various embodiments of the present disclosure, a method and a device for preventing potential errors that may occur when performing a DAPS handover can be provided.