V2X UE Conditional Handover for Low-Latency Mobility
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Solution Overview
Problem
Existing mobile communication systems face challenges in effectively providing services, particularly in high-speed and high-data-rate scenarios, such as those encountered in vehicle-to-everything (V2X) operations, due to the need for efficient mobility management and handover processes.
Innovation Solution
A method for conditional handover by a vehicle-to-everything (V2X) user equipment (UE) involves transmitting a cell measurement report, receiving conditional handover configuration information, determining whether to perform a handover based on this information, and performing random access to a target cell when necessary, along with corresponding methods for the serving cell to configure and manage these handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in high-speed V2X operations, then the handover process can be completed, but the handover latency increases and service continuity is compromised
Solution Approach 1:
The patent applies preliminary action by pre-configuring handover parameters and candidate target cells before the actual handover is needed. The network pre-evaluates potential target cells and prepares handover configurations in advance, so when handover becomes necessary during high-speed movement, the UE can immediately execute the pre-prepared handover command without performing real-time cell evaluation and configuration, thereby reducing handover latency and ensuring service continuity.
2Speed
If frequent handovers are performed to track fast-moving V2X UEs, then mobility tracking accuracy improves, but handover overhead and network load increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting handover-related parameters such as measurement thresholds, evaluation criteria, and target cell selection criteria based on the UE's speed and movement characteristics. For high-speed V2X UEs, the system modifies these parameters to reduce the frequency of handovers while maintaining accurate mobility tracking, thereby reducing handover overhead and network load while still achieving effective mobility management.
3Measurement precision
If comprehensive cell measurement and evaluation is performed for handover decisions, then handover accuracy improves, but processing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by having the network pre-evaluate and pre-rank candidate target cells before handover is triggered. Measurement results and cell evaluation metrics are prepared in advance, so when handover becomes necessary, the UE can quickly make handover decisions based on pre-computed information rather than performing comprehensive real-time measurements and evaluations, thereby reducing processing time while maintaining handover accuracy.
Data Source
AI summary
According to an aspect of the disclosure, a method of performing a conditional handover by a vehicle-to-everything (V2X) user equipment (UE) may include: transmitting a cell measurement report to a serving cell; receiving conditional handover configuration information from the serving cell; determining whether to perform a handover, based on the conditional handover configuration information; and when it is determined to perform the handover, performing random access to a target cell.