L1/L2 Inter-Cell Mobility with Carrier Aggregation Activation Control
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in efficiently managing carrier aggregation (CA) and layer 1 (L1) or layer 2 (L2) mobility, leading to suboptimal mobility management.
Innovation Solution
Implementing mechanisms for L1/L2 based inter-cell mobility with CA, including cell activation or deactivation, and associated signaling to enhance mobility management efficiency and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier aggregation (CA) and L1/L2 mobility are implemented together, then mobility management efficiency and robustness are improved, but system complexity increases
Solution Approach 1:
The patent segments the cell activation/deactivation process into independent control mechanisms. The network node can independently control activation/deactivation of individual cells or groups of cells, allowing fine-grained management of CA configurations. This segmentation enables the system to handle complexity by processing cell operations in discrete, manageable units rather than as a monolithic process.
Solution Approach 2:
The patent implements preliminary configuration of cell activation/deactivation states before actual mobility events occur. The network node pre-configures which cells are activated or deactivated based on predicted mobility patterns and CA requirements. This preliminary action reduces the complexity of real-time decision-making during actual mobility transitions.
2Adaptability or versatility
If separate SCell and PCell activation/deactivation is implemented, then mobility management flexibility is improved, but control complexity increases
Solution Approach 1:
The patent applies segmentation by treating SCell and PCell activation/deactivation as separate controllable entities. The network node can independently manage the activation state of secondary cells versus primary cells, allowing flexible adaptation to different mobility scenarios. This independent control enables the system to activate only the necessary cell type for a given situation, optimizing flexibility without requiring complete system reconfiguration.
Solution Approach 2:
The patent implements dynamic control mechanisms that allow the activation/deactivation policy to change based on real-time mobility conditions. The system can dynamically switch between different control modes (separate control vs. joint control) depending on the current operational requirements, enabling adaptability while managing control complexity through conditional logic rather than fixed rigid rules.
3Speed
If L1/L2 mobility with CA is implemented, then transition speed between cells is improved, but signaling complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring cell activation states and mobility parameters before actual cell transitions occur. The network node prepares the necessary signaling configurations in advance, so when a mobility event is detected, the system can execute the transition using pre-prepared parameters rather than performing complex real-time calculations. This significantly speeds up cell transitions while managing signaling complexity through offline preparation.
Solution Approach 2:
The patent maintains continuity of useful action by keeping the CA configuration and cell activation states persistent across mobility events. Rather than re-establishing all CA parameters during each cell transition, the system preserves the active configuration state and only updates the necessary mobility-related parameters. This continuous preservation of useful state reduces the signaling overhead required for each transition while maintaining high transition speeds.
Data Source
AI summary
Apparatus, methods, and computer program products for L1 or L2 mobility are provided. An example method may include receiving a carrier aggregation (CA) configuration associated with a L1 or L2 mobility configuration from a network node, the L1 or L2 mobility configuration including primary cell (PCell) configurations for multiple cells. The example method may further include receiving at least one activation or deactivation of one of the PCell configurations from the network node.