Handover Threshold Control for Low Latency Wireless Connections
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Solution Overview
Problem
Existing communication systems face challenges in maintaining low communication delay during handovers between base stations, which is crucial for remote driving and other applications where precise communication is essential.
Innovation Solution
A controller and terminal device system that acquires and sets threshold values based on requested delay information and estimated communication delay, allowing for efficient handover to base stations with lower communication delay, thereby preventing handovers to stations with unsatisfactory delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal device executes handover process to switch connection between base stations to maintain network connection, then connection reliability is improved, but communication delay may increase
Solution Approach 1:
The system performs preliminary actions by acquiring requested delay information from the terminal device before handover execution, estimating communication delay for candidate base stations in advance, and pre-setting threshold values. This allows the terminal device to proactively identify and report suitable handover targets that meet delay requirements, preventing delayed handovers that would increase communication latency while maintaining connection reliability.
Solution Approach 2:
The system implements feedback mechanisms where the terminal device measures and reports wireless quality and communication delay of candidate base stations to the current base station. The current base station uses this feedback to determine whether to execute handover based on pre-set threshold values. This closed-loop feedback ensures handovers only occur when delay requirements are met, maintaining both connection reliability and low communication delay.
2Speed
If terminal device frequently reports wireless quality measurement results to trigger handover, then handover responsiveness is improved, but communication overhead increases
Solution Approach 1:
The system changes the parameter of reporting frequency by setting threshold values based on requested delay information and estimated communication delay. Instead of fixed periodic reporting, the terminal device reports measurement results only when they exceed dynamically adjusted thresholds. This adaptive parameter change reduces unnecessary reporting and communication overhead while maintaining rapid handover responsiveness when actually needed.
3Adaptability or versatility
If base station accepts handover requests from any candidate base station, then handover flexibility is improved, but communication delay control deteriorates
Solution Approach 1:
The system applies local quality by setting different threshold values for different candidate base stations based on their specific communication delay characteristics and the terminal device's requested delay requirements. Instead of uniform handover criteria, each candidate base station is evaluated against customized thresholds that reflect local network conditions and delay constraints, ensuring handover flexibility while maintaining delay control.
Data Source
AI summary
A controller, terminal device, control method, and program for communication handover is provided. The controller acquires requested delay information related to an amount of allowable delay by a terminal device connected to a first base station and communication delay information estimated with communications via a second base station. The controller sets a threshold value for determining whether or not the terminal device reports wireless quality measurement results of the second base station for handover from the second base station to the first base station based on the communication delay information of the second base station and requested delay information. Handover of the terminal device is controlled based on the measurement results report from the terminal device.