Repetitive Satellite Communications for Reliability
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Solution Overview
Problem
Non-terrestrial communication systems, such as satellite-based systems, face challenges in establishing and maintaining reliable wireless links due to factors like orbital velocity, regulatory power-density limitations, and hardware constraints in user equipment (UE).
Innovation Solution
The implementation of repetitive communications, where the same communication is repeatedly transmitted using multiple air interface resources, with a determined repetition configuration that includes frequency-domain, code-domain, and time-domain repetition factors, to improve signal quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetitive communications are implemented to improve signal quality and reliability, then the signal-to-noise ratio improves and fading effects are mitigated, but the transmission time and bandwidth resources are increased
Solution Approach 1:
The communication signal is divided into multiple repetitions transmitted across different time slots, frequency resources, or code domains. Each repetition carries the same information but through different air interface resources, allowing the receiver to combine signals and improve reliability while managing the time overhead through efficient resource allocation
Solution Approach 2:
The communication system employs periodic repetition of the same signal over multiple transmission opportunities. This periodic transmission pattern allows the receiver to accumulate signal energy and improve the signal-to-noise ratio through signal combining, while the periodic nature enables efficient scheduling and resource management
2Reliability
If repetitive communications are used to improve signal quality, then the signal-to-noise ratio improves, but the bandwidth resources consumed increase
Solution Approach 1:
The communication resources are segmented across multiple domains (time, frequency, code) rather than using a single resource block. This segmentation allows the system to achieve diversity gain and improve reliability while distributing the resource consumption across multiple dimensions, improving overall resource efficiency
Solution Approach 2:
The repetition mechanism serves multiple functions simultaneously: it improves signal quality through diversity combining, provides error correction, and enables adaptive resource allocation. The same repetition structure can be configured for different communication scenarios, making it a multi-functional solution that optimizes both reliability and resource usage
Data Source
AI summary
In aspects, a non-terrestrial communication system communicates with a user equipment, UE, using repetitive communications. The non-terrestrial communication system determines a repetition configuration for repetitive communications with the UE and indicates the repetition configuration to the UE. The non-terrestrial communication system communicates with the UE using the repetitive communications in accordance with the repetition configuration.