Mobile Terminal Cell Selection Using Relative Speed Thresholds
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Solution Overview
Problem
In wireless communication systems, determining whether a mobile terminal should connect to a moving base station is challenging, especially when both the terminal and base station are in motion, leading to inefficient handovers and increased power consumption, as existing algorithms are not well-suited for scenarios with moving base stations.
Innovation Solution
The method involves the mobile terminal determining the relative speed between itself and a detected base station, with the base station transmitting information on the duration it should be detected before a connection request is sent, allowing the terminal to decide whether to connect based on this speed, thereby reducing unnecessary handovers and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal continuously scans for and connects to base stations to ensure optimal signal quality, then the signal quality and data rate are improved, but the power consumption increases and unnecessary handovers occur
Solution Approach 1:
The patent changes the parameter of connection decision from solely signal strength-based to relative speed-based. By introducing relative speed as a critical parameter, the system avoids continuous scanning and handovers when relative speed is high, thereby reducing power consumption while maintaining acceptable signal quality.
Solution Approach 2:
Instead of continuously scanning all base stations, the patent applies partial action by scanning only when relative speed is below a threshold. This selective scanning approach reduces power consumption while still ensuring optimal connection when conditions are favorable.
2Reliability
If the mobile terminal performs frequent handovers to maintain connection with the most suitable base station, then the connection quality is improved, but the system resources are consumed and handover complexity increases
Solution Approach 1:
The patent introduces relative speed as a new parameter for handover decision-making. This changes the handover logic from continuous signal-quality-based handovers to selective handovers based on relative speed thresholds, thereby reducing handover complexity and resource consumption.
Solution Approach 2:
The patent performs preliminary assessment of relative speed before initiating handover procedures. By evaluating relative speed in advance, the system avoids unnecessary handover preparations and executions, reducing both complexity and resource usage.
3Productivity
If the mobile terminal connects to a base station with better signal strength, then the data rate is improved, but the number of handovers increases when both terminal and base station are moving
Solution Approach 1:
The patent changes the decision parameter from signal strength alone to relative speed. By doing so, it prevents frequent handovers that would occur when both terminal and base station are moving, even if signal strength fluctuates, thereby maintaining stable data rate without excessive handovers.
Solution Approach 2:
The patent applies partial handover action by only initiating handovers when relative speed is below the threshold. This selective approach ensures data rate improvement only when handovers are likely to be stable, avoiding unnecessary handovers that would lose time and disrupt connectivity.
4Adaptability or versatility
If the mobile terminal scans for WLAN Access Points to find suitable base stations, then the connection options are increased, but the power consumption increases when moving at high speed
Solution Approach 1:
The patent introduces relative speed as a parameter to control scanning behavior. When relative speed is high, scanning is suppressed to save power. When relative speed is low, scanning is permitted to provide connection options, thereby adaptively balancing versatility and power consumption.
Solution Approach 2:
The patent applies partial scanning by performing WLAN AP scans only when relative speed is below the threshold. This selective scanning provides connection options when beneficial while avoiding excessive power consumption during high-speed movement.
Data Source
AI summary
A method in a mobile terminal is disclosed for determining whether or not to transmit a connection request for a connection between the mobile terminal and a base station, where the base station is moving. When the mobile terminal is detecting the base station, the mobile terminal is determining an indication of a relative speed between the mobile terminal and the detected base station. The mobile terminal is then determining whether or not to transmit the connection request to the base station. It is determined to transmit the connection request when the determined indication of the relative speed between the mobile terminal and the base station indicates that the relative speed is below a first threshold.