PCell Selection in Mobility Active Set Management
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR and LTE, face challenges in dynamically managing a set of activated cells and primary cells to efficiently support user equipment (UE) mobility, particularly in scenarios requiring seamless handovers and optimal resource allocation.
Innovation Solution
The system employs physical layer (PHY) or medium access control (MAC) layer signaling to dynamically update the set of activated cells and designate a primary cell (PCell) among them, allowing for efficient activation and deactivation of cells based on UE measurements and network control, thereby ensuring seamless mobility and resource optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dynamic cell activation and deactivation is implemented to support UE mobility, then mobility performance and latency are improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic cell activation and deactivation mechanisms that allow the network to adaptively manage the set of activated cells based on UE mobility state and network conditions. The system transitions from static cell configuration to dynamic reconfiguration, enabling the network to optimize resource allocation and support seamless handovers while maintaining manageable complexity through automated decision-making algorithms.
2Reliability
If primary cell selection is dynamically updated during mobility, then connectivity reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent implements self-service mechanisms where the UE autonomously performs cell measurements and evaluates candidate cells for PCell selection based on pre-configured criteria. The UE independently determines when cell reconfiguration is needed and executes the selection process without requiring continuous network intervention, thereby maintaining high connectivity reliability while minimizing signaling overhead through UE-autonomous decision-making.
Solution Approach 2:
The system employs feedback mechanisms where measurement results from the UE are selectively reported to the network, and network decisions are fed back to the UE through control signaling. This feedback loop enables dynamic PCell selection based on real-time channel conditions while optimizing the frequency and amount of signaling by only updating parameters when necessary, thus balancing reliability improvement with overhead reduction.
3Stability of the object's composition
If multiple cells are activated to serve UE during mobility, then service continuity is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the set of activated cells into distinct functional categories, including the primary cell (PCell) for control signaling and critical services, and secondary cells (SCells) for data transmission and supplemental services. This segmentation allows the network to manage multiple cells systematically, maintaining service continuity through coordinated operation of PCell and SCells while reducing resource allocation complexity through hierarchical organization and specialized functionality assignment.
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to mobility techniques that allow for dynamically updating a set of cells activated to serve a user equipment (UE) and the cell in the set of cells designated as the primary cell (PCell). An example method includes receiving signaling indicating a set of cells supported by one or more distributed units (DUs) under a common central unit (CU); identifying a subset of the set of cells activated to serve the UE, wherein a first cell of the activated cells comprises a primary cell selected from cells included in a candidate set of primary cells (PCells); and identifying another one of the activated cells to serve as the PCell if the first cell is re-designated as a secondary cell (SCell), wherein the other one of the activated cells comprises a cell selected from the candidate set of PCells.