Mixed Feeder and User Link Bandwidth Reuse in Multi-Beam Satellite Systems
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Solution Overview
Problem
Multi-beam satellite systems face inter-beam interference issues due to the fixed assignment of frequency bands, which affects the overall efficiency and reliability of satellite-based data communication services.
Innovation Solution
A method is introduced to shuffle the assignment of forward/uplink and return/uplink frequency bands across multiple regions within a service area, allowing for a mixed mode assignment of frequency bands to reduce interference and increase spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tightly-packed beam patterns are used to cover service area with large number of users, then communication link capacity is improved, but inter-beam interference increases
Solution Approach 1:
The patent applies local quality by assigning different frequency bands to different geographical regions (cells) within the service area. Specifically, a first frequency band is assigned to forward links in odd-numbered cells while a second frequency band is assigned to forward links in even-numbered cells. This spatial differentiation of frequency allocation reduces inter-beam interference while maintaining high communication capacity across the entire service area.
Solution Approach 2:
The patent introduces frequency band allocation as an additional dimension for beam management. Instead of only managing beams in the spatial domain, the system adds frequency domain differentiation by assigning different frequency bands to different cells and link directions. This multi-dimensional approach allows tightly-packed beam patterns to be maintained while reducing interference through frequency separation.
2Object-affected harmful factors
If frequency bands are separately assigned to forward link and return link, then interference is reduced, but bandwidth utilization efficiency decreases
Solution Approach 1:
The patent merges the frequency band allocation for forward and return links by allowing the same frequency bands to be reused in both directions, but with different spatial assignments. The first frequency band is used for forward links in odd cells and return links in even cells, while the second frequency band is used for forward links in even cells and return links in odd cells. This merging approach with spatial differentiation reduces interference while improving bandwidth utilization compared to completely separate allocations.
Solution Approach 2:
The patent changes the allocation parameters dynamically based on geographical region and link direction. Instead of fixed separate allocations, the system varies frequency band assignment according to cell number (odd/even) and link type (forward/return), optimizing both interference reduction and bandwidth utilization through parameter differentiation.
Data Source
AI summary
An apparatus and method for a wireless communication system in which a forward/uplink portion and a return/uplink portion are assigned within an available frequency bandwidth is disclosed. More particularly, a service area is divided into multiple regions. The assignment of the forward/uplink portion of the return/uplink portion is shuffled in the multiple regions. The apparatus and method may be implemented in a multi-beam wireless communication system.