Conditional Cell Mobility Using Stored Target Cell Configurations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G NR cell mobility procedures are prone to handover failures due to reactive decision-making by base stations, leading to inefficiencies and delays, particularly in scenarios requiring ultra-reliable low-latency communications (URLLC) and massive machine type communication (mMTC).
Innovation Solution
Implementing conditional cell mobility procedures where user equipment (UE) receives initial cell configurations with execution conditions from a source base station, allowing it to execute the mobility only when specific conditions are met, thereby reducing handover failures and improving robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations perform reactive decision-making for handovers, then the system can respond to current network conditions, but handover failures and delays occur due to lack of preparation time
Solution Approach 1:
The patent applies preliminary action by having the UE receive and store initial cell configurations for candidate target cells before actual handover execution. The UE is pre-configured with cell configuration parameters and execution conditions, allowing it to quickly execute handover when conditions are met, thereby reducing handover delay while maintaining reliability through advance preparation
2Reliability
If the UE receives complete cell configuration parameters for each candidate target cell, then mobility robustness is improved, but signaling overhead and memory requirements increase
Solution Approach 1:
The patent segments cell configuration information into two parts: initial cell configuration parameters received in advance for multiple candidate target cells, and subsequent updates or differential configurations. This segmentation allows the UE to have basic mobility readiness without storing complete detailed configurations for all possible target cells, reducing signaling overhead while maintaining mobility robustness
Solution Approach 2:
The patent uses parameter changes by providing initial cell configuration parameters that can be updated or modified through subsequent signaling. Instead of transmitting complete configurations repeatedly, the system changes only the necessary parameters or provides differential updates, reducing signaling overhead while keeping the UE ready for rapid handover execution
Data Source
AI summary
The present disclosure relates to a user equipment, UE, comprising the following. A receiver receives, from a source base station, an initial cell configuration of at least one candidate target cell, wherein each initial cell configuration comprises cell configuration parameters of a respective candidate target cell for performing a conditional cell mobility procedure and comprises an execution condition as to when to execute the conditional cell mobility procedure with said respective candidate target cell. A circuitry of the UE, when the execution condition for a target cell among the at least one candidate target cell is fulfilled, executes the conditional cell mobility procedure with said target cell, based on the cell configuration parameters of said target cell. The circuitry maintains the received initial cell configuration of the at least one candidate target cell, upon successful completion of the conditional cell mobility procedure between the UE and said target cell.