Delay-Optimal Cooperation Transmission in Remote Sensing Satellite Networks
IEEE Transactions on Mobile Computing(2023)
摘要
Many remote sensing applications, such as the forest fire monitoring, need to send a large volume of data to the ground with low delay. Therefore, the
cooperation transmission
, which relies on cooperation among satellites to achieve continuous transmission, emerges as an indispensable technique. Most existing work cannot optimize the delay through dynamic cooperation transmission. In this paper, we investigate how to optimize the delay in remote sensing satellite networks based on cooperation transmission, where
cooperation hotspot
s refer to the satellites with ground-satellite links to the Earth Stations (ESs). First, we propose the
cooperation capability model
to quantify capabilities of cooperation hotspots, based on
the joint control of the dynamic topology and time-varying available resources
. Then, we uniformly model the inter-satellite routing and satellite-ES transmission scheduling, formulate the
satellite cooperation transmission
problem and prove its NP-hardness. To solve the problem, we propose the delay-optimal cooperation transmission scheme, including the
cooperation routing principle
based on topology features, the
centralized cooperation transmission (CCT)
algorithm based on randomized rounding and the
distributed cooperation transmission (DCT)
based on local information. Both algorithms take advantage of the cooperation capability model and adapt well to the dynamic topology and time-varying available resources. Finally, we formally analyze the approximation ratios and the time complexities of both the CCT and the DCT algorithms. We also prove that the DCT algorithm always setups loop-free paths. NS2-based simulation results demonstrate that our schemes have good scalability, and both CCT and DCT algorithms reduce the end-to-end delay on average by more than 21.77% compared to work in the state-of-the-art, and significantly improve throughput, packet loss rate and flow completion time.
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关键词
cooperation,networks,delay-optimal
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