Conditional Handover PSCell Selection for Robust 5G Mobility
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Solution Overview
Problem
Existing handover processes in wireless communication systems, particularly in 5G and beyond, face challenges in optimizing candidate PSCell selection and execution conditions during Conditional Handover (CHO) and Conditional PSCell Addition/Change (CPAC), leading to reduced reliability and system throughput.
Innovation Solution
A method for optimizing handover by transmitting and receiving messages between nodes to manage candidate PSCell lists, measurement configurations, and execution conditions, ensuring synchronized and robust handover through improved candidate PSCell selection and CHO+CPAC execution conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing handover processes are used in 5G systems, then basic handover functionality is maintained, but handover reliability and system throughput are reduced due to suboptimal candidate PSCell selection and execution conditions
Solution Approach 1:
The patent applies parameter changes by optimizing handover execution conditions through modified measurement thresholds (e.g., hysteresis parameters, time-to-trigger values) and adjusting candidate PSCell selection criteria. These parameter adjustments improve handover reliability by ensuring more accurate cell selection decisions while maintaining manageable process complexity through standardized configuration mechanisms.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring measurement reports from UEs regarding candidate PSCell qualities and handover execution outcomes. This feedback loop enables dynamic adjustment of handover parameters and candidate cell lists, improving reliability through data-driven optimization while keeping the system adaptable rather than overly complex.
2Productivity
If existing handover processes are used in 5G systems, then basic handover functionality is maintained, but system throughput is reduced due to suboptimal candidate PSCell selection and execution conditions
Solution Approach 1:
The patent applies preliminary action by pre-configuring candidate PSCell lists and establishing execution conditions before handover is needed. This allows the system to have optimized handover parameters ready in advance, enabling faster and more efficient handover execution that improves system throughput without adding significant operational complexity during actual handover events.
Solution Approach 2:
The patent optimizes system throughput by adjusting handover-related parameters such as measurement thresholds, reporting intervals, and candidate cell selection criteria. These parameter changes enable more efficient resource utilization and reduced handover failures, thereby improving overall system productivity while maintaining manageable process complexity through standardized configurations.
3Reliability
If candidate PSCell selection is not optimized, then handover process is simpler, but handover success rate is reduced
Solution Approach 1:
The patent applies segmentation by dividing the candidate PSCell selection process into distinct stages: initial candidate identification, measurement and evaluation, and final selection. This segmented approach improves handover success rate by ensuring thorough evaluation at each stage while managing complexity through modular processing steps that can be independently optimized and controlled.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The disclosure provides a method and device for handover optimization. The method includes transmitting a first message to a second node, wherein the first message includes at least one of first candidate secondary cell group (SCG) primary cell (PSCell) list information, measurement report configuration information, and first master cell group (MCG) plus SCG configuration information. When Conditional Handover (CHO)+Conditional PSCell Addition or Change (CPAC) is combined, a success rate of CHO+CPAC handover is improved by optimization of candidate PSCell selection or optimization of CHO+CPAC execution conditions, thus ensuring a user equipment (UE) to select a suitable target cell, improving robustness and reliability of a UE handover, and further improving system throughput.