Dynamic PCell Selection via L1/L2 Signaling in 5G NR
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Solution Overview
Problem
Current wireless communication systems, particularly 5G NR, face challenges in efficiently managing cell functionality and resource allocation to enhance user equipment (UE) performance and network reliability.
Innovation Solution
The proposed solution involves a method where user equipment (UE) determines an active set of serving cells and selects a primary cell (PCell) based on Layer 1 or Layer 2 signaling from the base station, or using a common rule. This method allows for dynamic cell functionality determination and improved resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional cell functionality determination methods are used in 5G NR, then network coverage and basic connectivity are maintained, but system adaptability to dynamic network conditions and resource allocation efficiency deteriorate
Solution Approach 1:
The patent implements dynamic cell functionality determination where the network can flexibly assign PCell functions to different cells based on real-time network conditions and UE requirements. The apparatus dynamically configures which cell performs PCell functions (such as PUCCH transmission, random access, paging) rather than using static assignments, allowing the system to adapt to changing channel conditions, load balancing needs, and mobility scenarios.
Solution Approach 2:
The invention changes the configuration parameters of cell functionality by introducing flexible indication mechanisms at Layer 1 and Layer 2. The network can modify which cell performs PCell functions through dynamic signaling, changing the operational parameters of the communication system without requiring full RRC reconfiguration, thus improving adaptability while controlling complexity.
2Productivity
If dynamic cell functionality determination is implemented, then resource allocation efficiency and communication efficiency improve, but signaling overhead and system complexity increase
Solution Approach 1:
The patent extracts the cell functionality indication from higher-layer RRC signaling and implements it at Layer 1 and Layer 2. By taking out this functionality indication from Layer 3 and placing it in physical layer (Layer 1) or MAC layer (Layer 2) signaling, the system achieves faster dynamic reconfiguration with more efficient signaling, reducing the overhead associated with frequent RRC message exchanges.
Solution Approach 2:
The apparatus performs preliminary configuration of multiple cells with their capabilities and potential functions before dynamic selection. The network pre-configures the UE with information about available cells and their functionalities, so that when dynamic reconfiguration is needed, the system can quickly select from pre-evaluated options rather than performing full assessments in real-time, thus improving resource allocation efficiency while managing signaling overhead.
3Reliability
If multiple cells are configured for a UE, then network reliability and service continuity improve, but difficulty in determining optimal PCell function increases
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors the performance of cells performing PCell functions and adjusts assignments based on measured outcomes. The system collects feedback on channel conditions, transmission success rates, and resource utilization from multiple configured cells, then uses this feedback to optimally determine which cell should perform PCell functions, simplifying the determination process through data-driven decisions.
Solution Approach 2:
The invention introduces an intermediary signaling mechanism at Layer 1 and Layer 2 that mediates between the multiple configured cells and the UE. This intermediary layer processes information from multiple cells, evaluates their suitability for PCell functions, and makes the determination on behalf of the system, reducing the complexity for both the network and UE to manage multiple cell configurations effectively.
Data Source
AI summary
A base station may select an active set of serving cells for a user equipment (UE) from a configured cell set of the UE. The base station may select a cell of the active set of serving cells to perform a primary cell (PCell) function for the UE. The base station may select the cell and transmit an indication of the selected cell to the UE in layer 1 or layer 2 signaling, or the base station may select the cell using a common rule and the UE may select the cell using the common rule. Upon determining the cell, the UE may perform the PCell function with the cell.