Anchor Band Cell Prioritization for Stable 5G NR Dual Connectivity
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Solution Overview
Problem
Current 5G communication systems face challenges in accessing New Radio (NR) services due to limitations in multi-Radio Access Technology (multi-RAT) dual connectivity, particularly in determining and selecting anchor band cells for stable dual connectivity, leading to unstable connections and poor user experience.
Innovation Solution
A method for a user equipment (UE) to determine whether a serving cell is an anchor band cell or a non-anchor band cell, and to report events for handover to a secondary cell, enabling connection with the secondary cell as a new serving cell, thereby accessing NR services through Carrier Aggregation (CA) mode and prioritizing anchor band cells for stable connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE connects to a non-anchor band cell as serving cell, then the connection can be established quickly, but the NR service cannot be accessed and connection stability deteriorates
Solution Approach 1:
The UE proactively determines whether the serving cell is an anchor band cell before attempting to access NR services. This preliminary check prevents connection instability by identifying suitable anchor band cells in advance, allowing the UE to request handover to appropriate cells that support both LTE and NR services, thereby resolving the contradiction between quick connection establishment and connection stability.
2Adaptability or versatility
If the UE prioritizes anchor band cells for handover, then NR service accessibility improves, but handover complexity increases
Solution Approach 1:
The UE autonomously determines whether the serving cell is an anchor band cell and automatically triggers handover procedures when NR services are required but the current cell cannot provide them. This self-service approach simplifies the overall system complexity by eliminating the need for complex network-side decision-making mechanisms, while still achieving improved NR service accessibility through anchor band cell prioritization.
Data Source
AI summary
Provided is a methods and apparatus for accessing New Radio (NR) services in a multi-RAT dual connectivity (DC). A method includes: selecting an anchor band cell as a primary cell for a User Equipment (UE) to access NR services in an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN)-NR dual connectivity (ENDC). The method also includes prioritizing anchor band cells for the UE to perform cell search or cell reselection in the ENDC scenario. The method further includes selecting an NR DC band cell as the primary cell for the UE to access NR DC services in an NR DC. The method further includes prioritizing the NR DC band cells for the UE to perform cell search or cell reselection in the NR DC scenario, when the UE is an RRC idle state.