Satellite Load Balancing via Dynamic Sub-Channel Allocation
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Solution Overview
Problem
Consumer broadband satellite services face capacity limitations due to the inherent design of first-generation satellite systems, which restrict the number of customers that can be adequately served and limit bandwidth for each subscriber, despite advances in communications and processing technology.
Innovation Solution
A novel satellite communications system employing a multi-beam satellite with dual-circular polarization, utilizing Traveling Wave Tube Amplifiers for maximum efficiency, and a gateway system that schedules traffic and allocates bandwidth dynamically across multiple physical sub-channels to optimize frequency reuse and increase available bandwidth per spot beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If first-generation satellite systems are used, then multi-gigabit per second capacity can be provided, but the number of customers that can be adequately served is limited
Solution Approach 1:
The patent divides the satellite coverage area into multiple spot beams, each serving a specific geographic region. This segmentation allows the system to serve more customers by distributing them across multiple beams while maintaining adequate bandwidth for each subscriber through dedicated beam allocation.
Solution Approach 2:
The patent introduces polarization diversity by utilizing both circular polarizations (right-hand and left-hand) simultaneously. This adds a new dimension to frequency reuse, allowing the system to double the effective capacity utilization and serve more customers without increasing the physical satellite footprint.
2Adaptability or versatility
If capacity is split across numerous coverage areas, then more customers can be served, but the bandwidth to each subscriber is limited
Solution Approach 1:
By segmenting the coverage into discrete spot beams with dedicated polarization channels, the system can allocate bandwidth more efficiently. Each spot beam can be assigned specific polarization channels that are reused across different beams, ensuring that each subscriber receives adequate bandwidth while the overall system serves more customers.
Solution Approach 2:
The patent changes the polarization parameter from single-polarization to dual-circular-polarization mode. This parameter change enables frequency reuse across multiple spot beams while maintaining adequate bandwidth per subscriber by utilizing the orthogonal polarization states to multiply the effective capacity.
3Productivity
If dual-circular polarization is used, then frequency reuse efficiency increases, but system complexity increases
Solution Approach 1:
The patent implements a universal polarization handling approach where the same signal processing infrastructure handles both circular polarizations through a unified architecture. The gateway and satellite terminals use consistent protocols for both RHCP and LHCP signals, reducing the complexity increment compared to implementing separate systems for each polarization mode.
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
The system effectively increases available bandwidth per spot beam, allowing for more efficient allocation of resources and improved service capacity, addressing the limitations of existing designs and meeting growing demand for broadband services.
Implementation Method 1
utilizing Traveling Wave Tube Amplifiers for maximum efficiency
Implementation Method 2
multi-beam satellite with dual-circular polarization
Data Source
AI summary
A satellite system for broadband communication utilizing load balancing of satellite modems between physical forward sub-channels. The bandwidth requirements of the various satellite modems allocated to a domain are analyzed. Satellite modems, which can be moved between various physical forward sub-channels, are moved among physical forward sub-channels of a plurality of domains to balance loading between domains and/or physical forward sub-channels within domains. Buffering and latency are monitored in the subscriber modem termination system (SMTS) to allow dividing physical forward channel delay either uniformly or according to tiers of quality of service.