Communication Apparatus Guard Time Reduction for Satellite Throughput
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Solution Overview
Problem
In long-distance TDD communication methods for ground-satellite communication, the increased ratio of guard time occupancy due to propagation delay results in decreased communication capacity (throughput).
Innovation Solution
A communication apparatus and method where the receiver and transmitter periods overlap partially, with the propagation delay time calculated based on the positions of the terminal and the apparatus, allowing identical frequencies for upward and downward carrier waves, thereby reducing the need for excessive guard time and enhancing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard time is increased to accommodate propagation delay in TDD communication, then communication reliability is improved, but throughput decreases
Solution Approach 1:
The system performs preliminary calculation of propagation delay time based on terminal and apparatus positions, and uses this information to optimally configure time slot durations and guard time before actual communication begins. This allows the system to prepare appropriate timing parameters in advance, avoiding excessive guard time while ensuring reliable communication.
Solution Approach 2:
The system dynamically adjusts time slot parameters (duration, start time, end time) and guard time based on calculated propagation delay. By changing these temporal parameters according to actual communication conditions, the system optimizes the balance between reliability and throughput, preventing fixed excessive guard time from reducing productivity.
2Adaptability or versatility
If TDD communication method is applied to ground-satellite communication with long propagation delay, then communication adaptability is improved, but throughput decreases due to increased guard time occupation ratio
Solution Approach 1:
The system makes time slot configuration dynamic by calculating propagation delay based on actual positions of terminal and apparatus, then adjusting time slot durations and guard time accordingly. This dynamic adaptation allows the system to maintain high throughput while preserving the adaptability benefits of TDD communication for varying propagation conditions.
Solution Approach 2:
The system uses position information feedback to calculate propagation delay and adjust timing parameters. By continuously monitoring and using feedback about communication conditions, the system optimizes throughput while maintaining adaptability to different ground-satellite communication scenarios.
Data Source
AI summary
A communication apparatus according to the present disclosure includes a receiver configured to receive upward data being transmitted from a terminal during an upward period from a terminal transmission start time to a terminal transmission end time in an upward slot, during an own apparatus reception period being equal in length to the upward period from an own apparatus reception start time being later than the terminal transmission start time by a propagation delay time; and a transmitter configured to transmit downward data during an own apparatus transmission period being equal in length to a downward period from an own apparatus transmission start time being earlier than a terminal reception start time by the propagation delay time, in such a way that the terminal receives the downward data during the downward period from the terminal reception start time to a terminal reception end time in a downward slot.