Fast Cell Setup for Dual Connectivity in 5G Networks
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Solution Overview
Problem
In 5G communication systems, the existing methods for multi-RAT dual connectivity face challenges in fast cell setup due to invalid secondary cell group configurations caused by user equipment mobility, leading to increased latency during cell setup.
Innovation Solution
A method where the wireless device receives a secondary cell group configuration, identifies valid secondary cells, and selects a primary secondary cell, allowing for efficient and rapid setup of both master cell group and secondary cell group configurations by measuring candidate cells in advance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network provides SCG configuration blindly without knowing which cells are valid in the UE, then the cell setup procedure can be initiated, but the SCG configuration may fail due to mobility causing some or all cells to be invalid, increasing latency
Solution Approach 1:
The network performs preliminary actions by providing validity information for secondary cells before the UE attempts to use them for SCG configuration. This allows the UE to identify valid cells in advance, preventing configuration failures and reducing latency associated with reconfiguration attempts.
Solution Approach 2:
The network provides feedback to the UE about which secondary cells are currently valid through validity information signaling. This feedback mechanism enables the UE to make informed decisions about cell selection for SCG configuration, improving both reliability and speed by avoiding invalid cells.
2Loss of time
If the UE keeps SCG lower layer configuration during resume procedure, then fast cell setup is enabled, but configuration failure occurs when cells become invalid due to mobility
Solution Approach 1:
The network performs preliminary validation and provides validity information for cells before the UE resumes operations. This preliminary action ensures that the UE only uses valid cells for SCG configuration, maintaining both speed and reliability during resume procedures.
Solution Approach 2:
The system dynamically changes the parameter of cell validity status based on current network conditions and UE location. By updating validity information, the system ensures that the UE uses current, valid cell configurations rather than stale configurations that may have become invalid due to mobility.
3Productivity
If the network sends resume message with SCG configuration blindly configured, then the procedure can be completed quickly, but the configuration may be incorrect if cells are no longer valid
Solution Approach 1:
The network performs preliminary validation of cell validity before including SCG configuration in the resume message. This preliminary action ensures that the configuration sent to the UE is accurate and based on currently valid cells, maintaining both efficiency and precision.
Solution Approach 2:
The network provides feedback about cell validity status to guide the SCG configuration process. This feedback ensures that the configuration is accurate by informing the UE which cells are currently valid, preventing incorrect configurations while maintaining procedural efficiency.
Data Source
AI summary
Provided are a method for fast cell setup. According to an embodiment of the present disclosure, the method includes receiving a secondary cell group (SCG) configuration from a first network node, wherein the SCG configuration includes information on secondary cells related to a second network node, identifying at least one valid cells among the secondary cells, and selecting a primary secondary cell (PSCell) among the valid cells.