Train Communication Relays Using Virtual MIMO Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Providing sufficient wireless data communication bandwidth and broadband capacity to high-speed trains is challenging due to the limited number of base stations and the need for rapid, short-term data communication resources as trains travel along tracks.
Innovation Solution
A system and method for establishing wireless communication between a train and base stations using communication relays with channel state information (CSI) determination and storage, allowing for efficient reuse of CSI across the train and employing multiple-input multiple-output (MIMO) arrays with cooperative communication schemes to enhance bandwidth and signal reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of base stations is increased to provide sufficient wireless data communication bandwidth to high-speed trains, then the communication bandwidth and broadband capacity are improved, but the cost and complexity of the communication infrastructure increase
Solution Approach 1:
The train is divided into multiple coaches, each equipped with its own communication relay. This segmentation allows each relay to independently communicate with base stations, effectively distributing the communication load and providing sufficient bandwidth without requiring a proportional increase in base station infrastructure.
Solution Approach 2:
Communication relays are introduced as intermediary devices on the train to bridge the gap between mobile devices and base stations. These relays receive and forward communication signals, enabling efficient data transmission without requiring direct connections between every device and base station, thus reducing infrastructure complexity.
2Area of stationary object
If base stations are positioned to serve high-speed trains, then wireless data communication coverage is improved, but the processing time and signaling overhead increase due to the need for rapid resource allocation
Solution Approach 1:
Channel state information (CSI) is determined and stored in advance for multiple locations along the train track. When the train approaches these pre-measured locations, the relays can quickly retrieve and use the stored CSI without performing real-time measurements, significantly reducing processing time and signaling overhead while maintaining comprehensive coverage.
3Quantity of substance
If communication relays are deployed on each coach to increase bandwidth capacity, then the communication bandwidth is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The same communication relay design is copied and deployed on each coach of the train. This standardized approach allows for efficient manufacturing and maintenance while enabling each relay to independently contribute to the overall bandwidth capacity. The relays work cooperatively using MIMO techniques to provide high-capacity communication without proportionally increasing system complexity.
Solution Approach 2:
Multiple communication relays on different coaches are merged into a cooperative MIMO system. By combining the resources of multiple relays, the system achieves high bandwidth capacity and signal reliability through spatial diversity, effectively managing the complexity through coordinated operation rather than independent management of each relay.
4Productivity
If the train speed is increased to improve travel efficiency, then the productivity is improved, but the communication reliability decreases due to shorter dwell times near base stations
Solution Approach 1:
The train communication system is segmented into multiple relays distributed across different coaches. This segmentation ensures that at least some relays maintain reliable communication with base stations at any given time, even at high speeds, as different parts of the train are at different positions relative to the base stations.
Solution Approach 2:
The system uses channel state information feedback to dynamically adjust communication parameters. By continuously monitoring channel conditions and using this feedback to optimize transmission, the system maintains reliable communication even when the train moves quickly through different signal environments.
Data Source
AI summary
Methods and systems are provided for communication between moving objects and land-based systems. A virtual multiple-input and multiple-output (MIMO) array may be established for communications between a transportation object and a communication network. The virtual MIMO array may include at least a network transceiver of the communication network that is in proximity to the transportation object or a path of the transportation object, and at least a first transceiver and a second transceiver from a plurality of transceivers in the transportation object. Communications may be setup with the network transceiver via the first transceiver, and the communications may be configured for use of the virtual MIMO array. The configuring may include determining when the second transceiver comes within communication range of the network transceiver due to movement of the transportation object, and based on the determination, communicating at least some signals via the second transceiver using the virtual MIMO array.