Group Mobility Mobile Station for Train Wireless Offloading
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Solution Overview
Problem
In conventional radio communication systems, the performance degrades due to control signals and inter-terminal interference when multiple terminals within a moving object, such as a train or bus, communicate individually with radio base stations, especially when the object crosses cell boundaries.
Innovation Solution
A radio communication system with a dedicated GM mobile station and GM base station that uses MIMO and beam forming to relay communications between user terminals and macro/small base stations, offloading communications to reduce load and improve system performance without modifying user terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each terminal communicates individually with radio base stations, then terminal autonomy and communication flexibility are maintained, but system performance degrades due to control signal overhead and inter-terminal interference
Solution Approach 1:
The patent merges multiple terminals into a single group mobility terminal that communicates with the base station on behalf of the entire group. This consolidation reduces control signal overhead and eliminates inter-terminal interference while maintaining communication flexibility through the group terminal's autonomous operation.
Solution Approach 2:
The group mobility terminal acts as an intermediary between the base station and multiple user terminals. It receives and processes control signals from the base station, then distributes appropriate signals to individual terminals, thereby reducing the overall control overhead on the network while maintaining terminal autonomy.
2Area of stationary object
If terminals communicate individually through base stations, then communication coverage is extended, but performance degrades remarkably when the moving object passes through cell boundaries
Solution Approach 1:
By consolidating multiple terminals into a single group mobility terminal, the patent reduces the number of simultaneous handover operations when passing through cell boundaries. This merging approach minimizes handover-related performance degradation while maintaining extended coverage through the group terminal's mobile station functionality.
3Reliability
If a dedicated GM mobile station and GM base station are introduced to improve system performance, then control overhead and interference are reduced, but device complexity increases
Solution Approach 1:
The group mobility terminal is designed with multi-functionality, serving both as a regular user terminal and as a base station for other terminals within the moving object. This universal design reduces the need for separate dedicated GM equipment, thereby limiting the increase in device complexity while maintaining improved system performance.
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 configuration enhances communication stability and throughput by reducing overhead and interference, maintaining system performance even during handovers and fast channel variations, thereby stabilizing the network.
Implementation Method 1
uses MIMO and beam forming to relay communications
Implementation Method 2
uses MIMO and beam forming to relay communications
Data Source
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AI summary
To improve system performance for mobile communications (group mobility) in a plurality of terminals existing inside the same moving object, a radio communication system of the present invention is a radio communication system for mobile communications in a plurality of user terminals existing in a moving object, and has a radio base station for forming a cell on a moving path of the moving object, and a radio mobile station installed in the moving object to relay communications between the plurality of user terminals and the radio base station. By this means, by offloading communications according to user terminals inside the moving object by the dedicated system for group mobility, it is possible to reduce the load on the existing radio communication system, and it is possible to improve system performance of the entire radio communication system.