Distributed Antenna Sliding Window for High-Speed Vehicle Communication
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Solution Overview
Problem
Conventional communication systems fail to provide reliable and high-speed communication services to ultrahigh-speed vehicles due to signal degradation and handover issues caused by the Doppler effect, leading to poor performance at speeds exceeding 1220 km/h.
Innovation Solution
A communication apparatus with distributed antennas that form a sliding window, reconfiguring to maintain synchronization and use the same radio resources for continuous communication as the vehicle moves, minimizing handover procedures and maintaining signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cellular communication schemes are used for high-speed vehicles, then communication coverage can be provided, but communication quality deteriorates due to the Doppler effect and frequent handover procedures
Solution Approach 1:
The communication system is divided into multiple distributed antenna units arranged along the vehicle's movement path. Each antenna unit serves a specific segment, and the system transitions from cellular-based macro-cell handovers to a segmented micro-cell architecture where the vehicle continuously receives signals from multiple adjacent antenna units without traditional handover procedures.
Solution Approach 2:
The system dynamically adjusts the set of active distributed antenna units based on the vehicle's real-time position and speed. As the vehicle moves, the communication system dynamically reconfigures which antenna units are active, maintaining optimal signal strength and communication quality without requiring traditional handover procedures.
2Reliability
If leaky coaxial cable systems are used for high-speed trains, then communication support can be provided, but installation and maintenance costs increase due to precise alignment requirements and constant interval maintenance
Solution Approach 1:
The continuous leaky coaxial cable is divided into discrete distributed antenna units with specific spacing. Each unit operates independently, eliminating the need for precise continuous alignment along the entire cable length. This segmentation allows for easier installation and maintenance while maintaining communication reliability.
Solution Approach 2:
The system changes the operational parameters by using discrete antenna units with predetermined spacing rather than a continuous cable system. This parameter change from continuous to discrete architecture reduces installation complexity and maintenance requirements while maintaining the communication function.
3Area of stationary object
If the cable length increases in LCX-based systems, then coverage area expands, but reception performance decreases due to signal loss and handover issues
Solution Approach 1:
The long cable system is segmented into multiple distributed antenna units, each providing localized coverage. This segmentation prevents signal degradation over long distances by distributing the transmission function across multiple shorter segments, maintaining reception performance while expanding overall coverage area.
Solution Approach 2:
The system transitions from a single-dimension continuous cable to a multi-dimensional array of distributed antenna units. This spatial distribution across multiple locations allows the system to provide extensive coverage area while maintaining high reception performance at each location through proximity to the vehicle.
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
Enables stable and high-speed communication for ultrahigh-speed vehicles by dynamically adjusting the sliding window of antennas, reducing signal loss and handover frequency, thus improving overall communication performance.
Implementation Method 1
a plurality of distributed antennas (DAs) located along a movement path of the first mobile apparatus, which transmit and receive signals
Implementation Method 2
as the vehicle speed increases, the data transmission rate tends to decrease due to the Doppler effect
Data Source
AI summary
A communication device for an ultra-high-speed vehicle comprises a processor for performing a radio resource control function for communication between a first mobile device and the communication device, and a plurality of distributed antennas (DAs) positioned in a path of the first mobile device and transmitting or receiving a signal according to a control of the processor. The communication device also comprises a memory for storing at least one command executed by the processor. The at least one command is executed to configure a first sliding window including n DAs corresponding to a first position of the first mobile device, among the plurality of DAs, and perform communication with the first mobile device located at the first position by using the n DAs. Therefore, the performance of a communication system can be improved.