UE Mobility Handover Using Target-Cell Uplink Quality
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Solution Overview
Problem
Existing communication systems face challenges in efficiently managing mobility, particularly in situations where coordination between source and target cells is limited, such as inter-RAT handovers, and do not adequately consider uplink quality during handover processes.
Innovation Solution
A target cell-oriented mobility scheme that allows terminals to determine and request handovers based on uplink quality measurements, with explicit indications from neighbor cells regarding mobility availability and threshold-based handover confirmations or cancellations, minimizing coordination between base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional source cell-oriented handover procedure is used, then coordination between base stations is maintained, but handover process becomes complex and time-consuming especially in inter-RAT scenarios
Solution Approach 1:
The patent inverts the traditional handover control paradigm by shifting decision authority from the source cell to the target cell. The terminal autonomously selects the target cell and sends a handover request directly to it, bypassing the traditional source cell control path. This inversion simplifies the procedure especially in inter-RAT scenarios where source-target coordination is limited, while maintaining necessary coordination through the target cell's autonomous evaluation of handover requests.
2Reliability
If existing handover methods are used, then source cell control is maintained, but uplink quality to target cell is not adequately considered
Solution Approach 1:
The patent implements preliminary action by having the terminal perform uplink quality measurements to the target cell before initiating handover. The terminal measures uplink reference signals from the target cell and includes these measurements in the handover request message sent to the target cell. This allows the target cell to evaluate the handover request based on actual uplink quality conditions, ensuring reliable handover decisions while preserving uplink quality information that would otherwise be lost in traditional methods.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment, a method performed by a user equipment (UE) in a communication system includes: receiving, from a serving cell, configuration information on uplink quality measurement reference signal corresponding to a neighbor cell; identifying that a mobility to the neighbor cell is triggered; transmitting, to the neighbor cell, the uplink quality measurement reference signal based on the configuration information; and receiving, from the neighbor cell, a first response message associated with whether the mobility is available, wherein whether the mobility is available is based on uplink quality corresponding to the uplink quality measurement reference signal.