Vehicle Data Rate Adjustment via AP Count Comparison
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Solution Overview
Problem
Frequent handoffs between access points (APs) due to a vehicle's high speed lead to reduced communication seamlessness and reliability in Vehicle-to-Infrastructure (V2I) communication.
Innovation Solution
A method and apparatus that adjust data transmission rates between a vehicle and an AP based on the number of APs with signal strength greater than or equal to a threshold value, by comparing the current number of APs to the previous number, and adjusting the transmission rate accordingly, including changing modulation schemes or buffer transmission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the vehicle moves at high speed, then the communication coverage is expanded, but the handoff frequency increases causing communication reliability to deteriorate
Solution Approach 1:
The system performs preliminary actions by proactively adjusting the data transmission rate before handoff occurs. When the number of available APs increases, the system preemptively reduces the transmission rate to prepare for upcoming handoff, thereby preventing communication failures rather than reacting to them after they occur.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring the number of available APs and using this information to dynamically adjust the data transmission rate. This closed-loop control ensures that the transmission rate is optimized based on real-time network conditions, preventing handoff failures before they impact communication reliability.
2Productivity
If the data transmission rate is increased, then the communication efficiency is improved, but the handoff failure rate increases due to insufficient preparation time
Solution Approach 1:
The system applies dynamics by making the data transmission rate adjustable rather than fixed. The transmission rate is dynamically changed based on the number of available APs, allowing the system to optimize between communication efficiency and handoff reliability in real-time according to actual network conditions.
Solution Approach 2:
The system changes the parameter of data transmission rate based on the number of available APs. When more APs are detected, the transmission rate is reduced to allow better handoff preparation; when fewer APs are available, the rate is increased to maintain efficiency. This parameter adjustment resolves the contradiction between efficiency and reliability.
3Reliability
If the data transmission rate is reduced, then the handoff reliability is improved, but the communication efficiency deteriorates
Solution Approach 1:
The system performs preliminary rate reduction when the number of available APs increases, preparing for upcoming handoff before it occurs. This preemptive action ensures smooth handoff without permanently sacrificing communication efficiency, as the rate is only reduced temporarily during handoff preparation periods.
Solution Approach 2:
The system implements periodic monitoring of available APs and adjusts the transmission rate accordingly. The rate adjustment is periodic rather than continuous, maintaining high efficiency during stable conditions while periodically reducing the rate when handoff preparation is needed, thus balancing reliability and efficiency.
Data Source
AI summary
Disclosed is a method of adjusting a data transmission rate between a vehicle and an access point (AP) as an embodiment of the present invention. The method according to an embodiment of the present invention may include receiving a signal broadcast from at least one AP near a vehicle, transmitting and/or receiving data to and/or from a predetermined AP at a first data transmission rate R0 on the basis of the received signal, receiving and storing signals broadcast from a plurality of APs near the vehicle in every predetermined period while the vehicle is moving, determining the number NT of APs having broadcast signals with strength greater than or equal to a threshold value among the signals received from the plurality of APs, comparing the number NT of APs to the number NT-1 of APs having broadcast signals with strength greater than or equal to the threshold value in a previous period, and determining a data transmission rate between the vehicle and the AP on the basis of a result of the comparison.