UE Cell Handover via Transmission Delay Monitoring

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Solution Overview

Problem

When user equipment (UE) experiences transmission delay congestion, it cannot transmit user state data effectively, leading to poor communication quality and user experience if it remains in the current cell.

Innovation Solution

A method where the UE monitors the transmission delay of its current cell and reports a preset message to the base station when the delay reaches a threshold, triggering a cell handover command to switch to a neighboring cell with lower delay.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE continues to stay in the currently serving cell during congestion, then the UE can maintain connection stability, but the transmission delay increases and communication quality deteriorates

Engineering Contradiction:
Improveconnection stabilityVSAvoidtransmission delay
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The UE monitors transmission delay in real-time and provides feedback to the base station when the delay reaches a threshold. This feedback mechanism enables the base station to make informed handover decisions, switching the UE to a less congested cell while maintaining connection stability and reducing transmission delay.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The UE proactively monitors transmission delay and reports to the base station before severe congestion occurs. By detecting delay thresholds in advance and triggering handover requests early, the system performs preliminary actions to prevent communication quality deterioration while maintaining stable connections.

Inventive Principle:
Principle #10Preliminary action

2Loss of time

If the UE performs cell handover frequently to avoid congestion, then transmission delay is reduced, but the handover process complexity and service interruption increase

Engineering Contradiction:
Improvetransmission delayVSAvoidhandover process complexity
Core Design Contradiction:
Loss of timeVSDevice complexity

Solution Approach 1:

The base station receives delay threshold reports from the UE and makes handover decisions based on this feedback. By centralizing the handover decision-making process at the base station rather than requiring continuous UE-initiated handovers, the system reduces transmission delay while managing handover complexity and avoiding excessive handover operations.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The system uses transmission delay as a key parameter to trigger handover. By monitoring this specific parameter and comparing it against a threshold, the system determines when handover is necessary, reducing unnecessary handovers while ensuring handover occurs when it will effectively reduce transmission delay, thus balancing delay reduction with process complexity.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS12238597B2Method, device, communication device and storage medium for cell handover
Publication Date: 2025.02.25 BEIJING XIAOMI MOBILE SOFTWARE CO LTD
  • US12238597B2 patent drawing
  • US12238597B2 patent drawing
  • US12238597B2 patent drawing

AI summary

The present disclosure relates to a method, device, communication device and storage medium for cell handover. The cell handover method is applied to a user equipment UE. The method includes: monitoring a transmission delay of a first cell where the UE is currently located; and reporting a preset message in response to the transmission delay reaching a delay threshold. The preset message is configured to trigger a base station to issue a cell handover command instructing the UE to perform cell handover.