Beamformed Band Allocation for Interference-Limited Wireless Base Stations
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Solution Overview
Problem
Interference between base stations in high-frequency band wireless communication systems, particularly in vehicle terminals and base stations, is a challenge due to the short coverage and high path loss, which affects the performance of high-speed Internet services in public transportation vehicles.
Innovation Solution
A frequency resource allocation method is implemented where base stations configure a first and second band for communication, use beamforming to transmit synchronization signals, and exchange resource use permission messages to manage frequency resources, allowing terminals to switch bands based on distance and availability, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is applied in high-frequency band (30 GHz) to compensate for short coverage, then link performance is improved, but inter-cell interference increases due to directional concentration of energy
Solution Approach 1:
The patent segments the frequency band into multiple bands (first band and second band) to allow different base stations to operate on different frequencies. This frequency division approach reduces inter-cell interference while maintaining the beamforming benefits for link performance in high-frequency bands.
Solution Approach 2:
The patent implements dynamic band switching where base stations and terminals can switch between first band and second band based on interference conditions and resource availability. This dynamic adaptation allows the system to optimize between link performance and interference reduction in real-time.
2Productivity
If frequency resources are allocated to multiple adjacent base stations in the same band, then communication capacity is improved, but interference between base stations increases
Solution Approach 1:
The patent divides the frequency spectrum into multiple bands and allocates different bands to adjacent base stations. This segmentation allows multiple base stations to operate simultaneously without interfering with each other, maintaining communication capacity while reducing interference.
Solution Approach 2:
The patent implements a feedback mechanism where base stations exchange resource use permission messages to coordinate frequency resource allocation. This feedback loop enables dynamic adjustment of resource allocation to balance communication capacity with interference mitigation.
3Object-generated harmful factors
If resource use permission messages are exchanged between base stations to coordinate frequency usage, then interference is reduced, but signaling overhead increases
Solution Approach 1:
The patent implements partial coordination where base stations exchange resource use permission messages only for specific bands and time periods when interference mitigation is needed, rather than continuous full coordination. This reduces signaling overhead while maintaining interference reduction benefits.
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 approach alleviates inter-cell interference and improves transmission rates by optimizing frequency resource use and enabling smooth adjacent cell searches, enhancing communication efficiency in vehicle-based wireless networks.
Implementation Method 1
transmitting a synchronization signal in the first band by beamforming in one of both directions of a moving path of a transportation means
Data Source
AI summary
A communication method of a base station may include: configuring a first band as a communication band from an entire carrier frequency band of the base station, the entire carrier frequency band including the first band and a second band; transmitting a synchronization signal in the first band by beamforming in one of both directions of a moving path of a transportation means; communicating with a terminal by beamforming in a same direction as the synchronization signal in the first band; and transmitting a synchronization signal in the second band by beamforming in the same direction as the synchronization signal in the first band.