Coordination Multi-Point Transmission for High-Speed Vehicles
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Solution Overview
Problem
High-speed vehicles, such as trains, experience poor wireless communication due to the Doppler Effect and frequent handover procedures between base stations, leading to difficulties in channel estimation and high packet loss probabilities.
Innovation Solution
A method of coordination multi-point transmission is implemented, where a database is used to determine a set of coordinated base stations and their corresponding beamforming weighted matrices based on the vehicle's position, allowing for simultaneous signal transmission to the vehicle without the need for frequent handovers, using a control node and wireless communication device with access points that adapt beamforming matrices based on feedback information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover procedure is frequently performed between base stations for high-speed vehicles, then the vehicle can maintain connection with base stations, but packet loss probability increases
Solution Approach 1:
The patent merges multiple base stations into a coordination multi-point set that jointly serves the high-speed vehicle. Instead of switching between individual base stations through handover, the vehicle is served by a coordinated group of base stations simultaneously, eliminating handover-related packet loss while maintaining continuous connection.
Solution Approach 2:
The patent pre-configures coordination multi-point sets and beamforming weighted matrices in a database before the vehicle arrives. When the vehicle enters a coverage area, the appropriate pre-configured set and parameters are immediately activated, avoiding the need for real-time handover decisions and reducing packet loss during transition.
2Speed
If high-speed movement is maintained for long-distance travel, then travel time is reduced, but wireless communication quality deteriorates
Solution Approach 1:
The patent changes the communication parameters by using position-based coordination multi-point sets and beamforming weighted matrices. As the vehicle moves at high speed, the system dynamically adjusts the set of coordinating base stations and their beamforming parameters based on the vehicle's position, maintaining communication quality without reducing speed.
Solution Approach 2:
The patent implements feedback mechanisms where the wireless communication device reports channel conditions and position information to the control node. The control node uses this feedback to select appropriate coordination multi-point sets and beamforming parameters, ensuring communication quality adapts to the vehicle's high-speed movement.
3Reliability
If coordination multi-point transmission is implemented with position-based base station selection, then handover frequency is reduced, but database lookup complexity increases
Solution Approach 1:
The patent pre-configures and stores multiple coordination multi-point sets with their corresponding beamforming weighted matrices in the database before operation. Each set is associated with specific position ranges or scenarios. During operation, the system only needs to perform simple lookups based on the vehicle's position rather than performing complex real-time optimization calculations, reducing computational complexity while maintaining low handover frequency.
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 improves communication quality by reducing handover frequencies and mitigating the effects of the Doppler Effect, ensuring reliable wireless communication for passengers in high-speed vehicles.
Implementation Method 1
A first beamforming weighted matrix correspondingly used by each of the first coordinated base stations is obtained by looking up the database. Coordination multi-point transmission is performed with the at least one access point of the vehicle by the each of the first coordinated base stations using the corresponding first beamforming weighted matrix.
Data Source
AI summary
A method of coordination multi-point transmission is provided, which let a plurality of base stations perform communication with at least one access point of a vehicle. A first coordination multi-point set corresponding to a first position of the vehicle is obtained by looking up a database according to the first position. The first coordination multi-point set is a set of a plurality of first coordinated base stations among the plurality of base stations. A first beamforming weighted matrix correspondingly using by each of the plurality of first coordinated base stations is obtained by looking up the database. A coordination multi-point transmission is performed with the at least one access point of the vehicle by the each of the plurality of first coordinated base stations using the corresponding first beamforming weighted matrix of the each of the plurality of first coordinated base stations.