DAPS Handover with Dormant BWP for Low-Interruption 5G Mobility
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Solution Overview
Problem
In next-generation mobile communication systems, carrier aggregation leads to increased battery consumption due to monitoring of physical downlink control channels in multiple cells, while deactivating cells results in data transmission/reception latency. An efficient handover method is needed to minimize data interruption and support seamless service continuity.
Innovation Solution
Implementing a dual active protocol stack (DAPS) handover with a dormant bandwidth part (BWP) mode, allowing rapid activation/deactivation of carrier aggregation, and efficient handover methods to prevent data interruption and enable fallback to the source base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is configured in a UE with multiple cells activated, then data transmission rate is improved, but battery consumption increases due to monitoring of physical downlink control channels in multiple cells
Solution Approach 1:
The patent implements dynamic cell state management by introducing a dormant state between active and deactivated states. Cells can be rapidly activated or deactivated based on data transmission requirements, allowing the system to adapt power consumption levels dynamically while maintaining the capability for high-speed data transmission when needed.
Solution Approach 2:
The patent applies preliminary action by pre-configuring carrier aggregation cells in a dormant state before actual data transmission begins. This allows the UE to have cells ready for immediate activation without continuously monitoring them, thus preparing the system in advance for high-speed transmission while avoiding continuous power consumption.
2Use of energy by moving object
If cells are deactivated to reduce battery consumption, then energy usage is reduced, but data transmission/reception latency increases
Solution Approach 1:
The dormant state provides dynamic flexibility, allowing cells to be quickly transitioned from dormant to active state when data transmission is required. This dynamic state management enables the system to balance between power savings and rapid activation, avoiding the latency associated with full deactivation while still reducing power consumption during low-activity periods.
3Reliability
If DAPS handover is implemented to minimize data interruption, then service continuity is improved, but device complexity increases due to dual active protocol stacks
Solution Approach 1:
The patent segments the protocol stack functionality by introducing a dormant protocol stack that operates separately from the active stack. This segmentation allows the UE to maintain service continuity through the dormant stack while keeping the active stack optimized for current data transmission, thereby managing complexity through functional separation rather than full dual-stack operation.
Solution Approach 2:
The dormant protocol stack acts as an intermediary during handover transitions, maintaining protocol layer continuity while the active stack handles current communications. This intermediary function enables seamless handover without requiring the full complexity of simultaneously managing two complete active protocol stacks.
Data Source
AI summary
The present disclosure relates to a communication technique merging IoT technology with a 5th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) communication system such as long term evolution (LTE), and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, and security and safety related services) on the basis of 5G communication technologies and IoT-related technologies. Various embodiments of the present disclosure may provide a method and a device for bandwidth part switching in consideration of a dormant bandwidth part.