MF-TDMA Frequency Hopping for Satellite Bandwidth Efficiency
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Solution Overview
Problem
Consumer broadband satellite services face capacity limitations, which restrict the number of customers that can be adequately served due to inherent design constraints, and the demand for these services continues to grow despite advances in communications and processing technology.
Innovation Solution
The implementation of novel upstream scheduling and mapping techniques, including frequency hopping and prioritized resource allocation, in satellite communications systems to optimize the use of upstream frequency channels and improve bandwidth efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency hopping is implemented to dynamically reallocate channels, then bandwidth efficiency is improved, but system complexity increases due to additional scheduling and mapping requirements
Solution Approach 1:
The patent implements dynamic frequency hopping where subscriber terminals switch between different frequency channels based on real-time traffic conditions. The gateway device dynamically allocates time slots across multiple frequency channels, allowing the system to adapt to varying bandwidth demands and improve overall bandwidth efficiency while managing complexity through structured scheduling algorithms
Solution Approach 2:
The patent introduces frequency hopping by adding a frequency dimension to the traditional time-division multiple access (TDMA) system. Instead of using only time slots on a single frequency, the system now operates across multiple frequency channels, creating a two-dimensional resource allocation space (time × frequency) that improves bandwidth efficiency while requiring more complex scheduling to manage the additional dimension
2Reliability
If prioritized resource allocation is used for latency-sensitive traffic, then service quality is improved, but fairness to other traffic types deteriorates
Solution Approach 1:
The patent applies different allocation strategies to different traffic types based on their specific requirements. Priority traffic (such as voice or real-time applications) receives guaranteed time slots with higher allocation priority to ensure low latency and high reliability. Best-effort traffic receives remaining resources on a first-come, first-served basis. This localized quality approach ensures each traffic type gets appropriate service while maintaining overall system fairness
Solution Approach 2:
The patent segments the bandwidth allocation into different priority levels and traffic classes. By dividing the available time slots and frequency channels into priority-based groups, the system can guarantee service quality for latency-sensitive applications while still providing fair access to other traffic types through separate allocation pools, thus resolving the conflict between prioritization and fairness
3Quantity of substance
If more frequency channels are allocated to serve additional subscribers, then system capacity is improved, but interference between channels increases
Solution Approach 1:
The patent employs periodic frequency hopping patterns where subscriber terminals systematically switch between different frequency channels according to predetermined time schedules. This periodic action distributes interference more evenly across the frequency spectrum and time domain, allowing more channels to be utilized for serving additional subscribers while maintaining acceptable interference levels through structured temporal separation
Data Source
AI summary
Systems, methods, and devices are described for scheduling and mapping upstream communications in a satellite communications system. The disclosure includes various channelization and frequency hopping techniques. A gateway is described to perform novel allocation of time slots on upstream frequency channels to allow frequency hopping. A subscriber terminal may perform frequency hopping according to the allocation, and the range may be limited to the transition range of a digitally controlled oscillator unit at the subscriber terminal. A gateway is described to allocate time slots on different upstream frequency channels in a prioritized manner. Subscriber terminals may receive the allocation, and then control the assignment of their upstream traffic to the time slots.