SDR Network Management for Satellite Handoff Latency
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Solution Overview
Problem
Satellite-based internet connectivity for mobile platforms like planes and ships faces significant latency and inefficiencies due to the need for time-division multiple access (TDMA) systems, which require precise timing and frequency calibration, leading to slow handoffs and re-acquisitions when transitioning between satellite footprints.
Innovation Solution
Implementing a software-defined radio (SDR) network with a dynamic network management system that uses single channel per carrier (SCPC) connections, allowing for real-time allocation and deallocation of bandwidth, eliminating the need for handshaking and reducing latency by continuously broadcasting a steady data stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDMA systems are used for satellite communication, then bandwidth can be shared among multiple users, but handoff and re-acquisition time between satellites increases significantly
Solution Approach 1:
The system performs preliminary synchronization and calibration actions before the actual handoff is needed. Satellites continuously broadcast timing and frequency reference signals, and the user equipment maintains prepared synchronization states, so that when handoff is required, the transition can occur rapidly without extensive real-time calibration
Solution Approach 2:
The system maintains continuous broadcasting of reference signals and synchronization data from all satellites in the constellation. This continuous availability of synchronization information eliminates gaps during satellite transitions, allowing seamless handoff without interruption of the data stream
2Measurement precision
If precise timing and frequency calibration are implemented in TDMA systems, then data transmission accuracy is improved, but system complexity and setup time increase
Solution Approach 1:
The system employs self-synchronization mechanisms where user equipment automatically acquires timing and frequency calibration from continuously broadcast reference signals without requiring manual configuration or complex external calibration equipment. The satellites themselves provide the calibration data, eliminating the need for separate calibration procedures
Solution Approach 2:
The system implements feedback loops where timing and frequency offsets are continuously measured and corrected based on reference signals from satellites. This automatic feedback mechanism maintains precision without requiring complex manual intervention or sophisticated calibration infrastructure
3Reliability
If satellite footprints with overlapping coverage are used, then seamless handoff between satellites is enabled, but the number of satellites and system cost increase
Solution Approach 1:
The system segments the satellite constellation into multiple orbital planes with inclined orbits, where each plane provides coverage for specific geographic regions. This segmentation allows efficient use of satellite resources while maintaining overlapping footprints through the geometric arrangement of multiple planes rather than requiring excessive satellites in single orbits
Solution Approach 2:
The system transitions from thinking about satellite coverage in two dimensions (ground footprint area) to three dimensions (orbital inclination and plane geometry). By utilizing inclined orbital planes, the system creates natural overlapping coverage zones through the spatial arrangement of satellite orbits, enabling reliable handoff with a more efficient satellite count
Data Source
AI summary
The present disclosure relates to a software defined radio for a mobile network system including a plurality of satellite transponders, each satellite transponder operating using single channel per carrier (SCPC) transmission to allocate an entire bandwidth of a given frequency channel of a plurality of channels to the network management system, at least one ground station in communication with the plurality of satellite transponders, the at least one ground station communicating on at least one of the plurality of channels, using the plurality of satellite transponders, to a remote host, and a management server, that sets a bandwidth available for a particular channel of the plurality of channels at a predetermined maximum, regularly generating a quality of experience metric for the particular channel of the plurality of channels, and dynamically adjusts the bandwidth allocated to the particular channel of the plurality of channels based upon the quality of experience metric.