Mobile Relay Spectrum Allocation for High-Speed Backhaul
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Solution Overview
Problem
Current wireless communication systems, particularly in high-speed scenarios like high-speed trains, face bottlenecks in backhaul and access link capacity due to high Doppler shifts and frequent handovers, leading to reduced data transmission rates and increased power consumption.
Innovation Solution
Implementing a method and system for mobile relay that uses spectrum sensing and management to allocate available spectrum between a wireless relay and a base station and between the relay and a user terminal, establishing links on different working frequency bands to enhance capacity and mitigate Doppler effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile relay is implemented to support high speed mobility, then user mobility performance is improved, but backhaul link capacity becomes a bottleneck
Solution Approach 1:
The patent segments the frequency spectrum into multiple frequency bands and allocates different bands to different relay nodes. This segmentation allows parallel transmission on multiple frequencies, thereby increasing the overall backhaul link capacity while supporting high-speed mobility scenarios.
Solution Approach 2:
The patent introduces frequency diversity by utilizing multiple frequency bands simultaneously. This dimensional expansion from single-frequency to multi-frequency operation increases the capacity dimension of the backhaul link without compromising mobility support.
2Productivity
If carrier aggregation is used to increase relay system capacity, then backhaul link capacity is improved, but spectrum resources are limited
Solution Approach 1:
The patent applies local quality by allocating specific frequency bands to specific relay nodes based on their local channel conditions and service requirements. This localized spectrum allocation optimizes the use of limited spectrum resources while maximizing the overall relay system capacity.
Solution Approach 2:
The patent changes the parameter of frequency band allocation dynamically, assigning different frequency bands to different relay nodes according to their specific needs. This parameter optimization allows the system to achieve higher capacity with the same limited spectrum resources.
3Productivity
If enhanced multiple antenna transmission is used to increase relay capacity, then access link capacity is improved, but Doppler shifts degrade link quality
Solution Approach 1:
The patent segments the transmission across multiple frequency bands and relay nodes, which diversifies the transmission paths. This segmentation reduces the impact of Doppler shifts on any single link, maintaining link quality while enhancing access link capacity through multiple antennas.
Solution Approach 2:
The patent introduces spectrum management entities as intermediaries that coordinate frequency band allocation and manage the interactions between multiple relay nodes and access points. This intermediary management optimizes the use of multiple antennas while mitigating Doppler effects through coordinated frequency selection.
Data Source
AI summary
A method for implementing mobile relay station is provided. The method includes performing spectrum sensing at least one spectrum sensing entity in a base station, a mobile relay station and a user terminal, sending, by the spectrum sensing entity, the result of spectrum sensing to a spectrum managing entity in the mobile communication system, allocating, by the spectrum managing entity available spectrum to a first link between the mobile relay station and the base station and allocating, by the spectrum managing entity, the available spectrums to a second link between the mobile relay station and the user terminal as working spectrum. The present invention also provides a mobile relay station system. The present invention can solve the problem of capacity bottleneck in the backhaul links and access links in high speed wireless environment.