Base Station Handover Control for Reflection Communication
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Solution Overview
Problem
In wireless communication systems, base stations struggle to maintain stable connectivity with terminal devices inside areas shielded by structures like buildings, as reflected waves are not consistently supplied over a wide range, limiting the number of adaptable devices and requiring reduced communication time using reflected waves.
Innovation Solution
A base station device equipped with a notifier and controller to manage handovers, using a reflection device like a reconfigurable intelligent surface (RIS) to reflect radio waves and control handover conditions, ensuring efficient communication by setting favorable handover conditions for terminal devices under reflection communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reflection communication is used to extend coverage to shielded areas, then connectivity in dead zones is improved, but handover stability deteriorates due to ping-pong effects
Solution Approach 1:
The system performs preliminary detection to determine whether a terminal device is communicating via reflected waves before handover occurs. Based on this advance detection, the base station proactively adjusts handover parameters (such as increasing handover threshold or disabling handover to the source base station) to prevent ping-pong effects before they occur, rather than reacting after instability manifests
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors communication characteristics (signal strength, reflection patterns) and continuously adjusts handover parameters based on the detected communication state. This closed-loop control ensures handover stability adapts to the dynamic reflection communication environment
2Reliability
If handover conditions are made favorable for reflection communication, then connectivity in shielded areas is improved, but unnecessary handovers increase causing ping-pong effects
Solution Approach 1:
The system applies different handover conditions for different communication scenarios: for terminals using reflected wave communication, more favorable handover conditions are applied to ensure connectivity, while for direct line-of-sight communication, standard handover conditions are maintained. This localized differentiation ensures each terminal receives appropriate handover parameters based on its specific communication path
Solution Approach 2:
The base station detects in advance whether a terminal is using reflection communication and pre-configures appropriate handover parameters before handover decisions are made. This preliminary classification prevents both unnecessary handovers and connectivity failures by ensuring the correct handover policy is applied from the outset
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances communication efficiency by reducing communication time for terminal devices using reflected waves and preventing ping-pong handovers to the original base station, thereby improving connectivity in shielded areas.
Implementation Method 1
Some technologies reflect, using a reflection plate to reflect radio waves, the radio waves to a dead zone inside a communication area where radio waves do not reach
Data Source
AI summary
A base station device includes, a notifier configured to notify, when detecting a fact that a terminal device is under a reflection communication, the terminal device of a reflection communication handover condition for a case where the reflection communication is performed, and a controller configured to perform, when the terminal device under the reflection communication with a movement source base station device performs handover, control to restrain the terminal device from performing handover to the movement source base station device.