Adaptive Packet Repetition for Mobile Satellite Service Links
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Solution Overview
Problem
Mobile satellite service (MSS) links face challenges with channel blockages due to limited link margins and high propagation distances, making it difficult to maintain reliable communication, especially in urban areas where direct paths are frequently obstructed by buildings and trees, and existing solutions like HARQ and non-adaptive blind repetition are not effective in these conditions.
Innovation Solution
Implementing an adaptive packet repetition system that uses feedback information about channel blockages to dynamically repeat transmitted packets, allowing the system to adjust the number of repetitions based on the extent of the blockage, thereby increasing the likelihood of successful demodulation and decoding of received packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet repetition is increased to overcome channel blockages, then reliability of MSS links is improved, but latency and capacity costs increase
Solution Approach 1:
The system dynamically adjusts the packet repetition factor based on real-time channel blockage conditions. The base station receives feedback about blockage extent from user equipment and adaptively modifies the number of packet repetitions, transitioning from static to dynamic operation to optimize both reliability and latency trade-offs
Solution Approach 2:
The system changes the packet repetition parameter according to channel conditions. By receiving feedback information about blockage extent and adjusting the repetition factor accordingly, the system optimizes transmission parameters to maintain reliability while minimizing unnecessary repetitions that would increase latency
2Reliability
If packet repetition is increased to overcome channel blockages, then reliability of MSS links is improved, but capacity costs increase
Solution Approach 1:
The system dynamically adjusts the packet repetition factor based on real-time channel blockage conditions. The base station receives feedback about blockage extent from user equipment and adaptively modifies the number of packet repetitions, transitioning from static to dynamic operation to optimize both reliability and capacity trade-offs
Solution Approach 2:
The system changes the packet repetition parameter according to channel conditions. By receiving feedback information about blockage extent and adjusting the repetition factor accordingly, the system optimizes transmission parameters to maintain reliability while minimizing unnecessary repetitions that would consume capacity
3Device complexity
If adaptive packet repetition is implemented using feedback information, then system complexity is reduced compared to HARQ, but measurement precision requirements increase
Solution Approach 1:
The system extracts only the essential feedback information needed for packet repetition decisions, specifically blockage extent information, rather than implementing full HARQ status feedback. This simplifies the feedback mechanism while providing sufficient information for adaptive repetition control
Solution Approach 2:
The system implements a feedback mechanism where user equipment provides blockage extent information to the base station, which then adjusts packet repetition accordingly. This feedback loop enables adaptive operation with reduced complexity compared to full HARQ protocols
Data Source
AI summary
Systems and methods for intelligent packet repetition in mobile satellite service links to overcome channel blockages. One example method includes transmitting and receiving packetized wireless communications between first and second communications devices via a bidirectional wireless link. The method includes receiving, by a first communications device from a second communications device, feedback information including an indication of a blockage in the communication channel, the indication including information indicating the presence and extent of the blockage, wherein the feedback does not include status indications for individual received packets. The method includes, responsive to receiving the indication of a blockage in the communication channel, determining a packet repeat value based on the feedback information, wherein the packet repeat value may be greater than one. The method includes modifying a transmit signal of the bidirectional wireless link to repeat transmitted packets based on the packet repeat value.