Switching-Aware Dynamic Control Path Planning for Software Defined Large-Scale LEO Satellite Networks with GEO Controllers

Zhang, Tingting; Bai, Fan; Dong, Tao; Yin, Jun; Liu, Zhihui; Su, Yanyan

doi:10.1007/978-3-030-69069-4_13

Cited by 1 publication

(1 citation statement)

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“…Large-scale low Earth orbit (LEO) satellite constellations have uneven service distribution, frequent link switching, and a high probability of laser link interruption [1,2], which brings more significant challenges to the design of routing algorithms. In recent years, routing algorithms for largescale LEO constellations have gradually become an important issue in China and abroad [3][4][5][6][7]. Based on link characteristics, existing constellation routing algorithms are divided into delay tolerant (DTN) and nondelay tolerant (non-DTN) routing [8].…”

Section: Introductionmentioning

confidence: 99%

An Improved DTN Scheme for Large-Scale LEO Satellite Networks

Liu

Jiang

et al. 2023

Wireless Communications and Mobile Computing

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A large-scale low Earth orbit (LEO) satellite network has the characteristics of a complex link environment, a large number of satellites, and the limited resources of a single satellite. Applying traditional routing algorithms has disadvantages such as high overhead, high end-to-end latency, and low message delivery rate. This paper proposes an improved delay tolerant (DTN) scheme for large-scale LEO satellite networks (LIDTN) to improve transmission efficiency and reduce the resource overhead and end-to-end latency of large-scale satellite networks. This scheme improves the network performance in three aspects: next hop selection, congestion control mechanism, and acknowledgment mechanism. For the next hop selection, we propose an equivalent distance and priori knowledge-based forwarding strategy (EPFS), which has the advantages of low overhead, loop avoidance, and fast convergence. For congestion control, we put forward an emergency function-based bundle drop algorithm (EBDA). For acknowledging, we propose the virtual acknowledgment algorithm (VAA) by combining the characteristics of many path hops and high link disruption rates in large-scale constellations. Finally, we simulate and verify the LIDTN scheme on the OneWeb constellation. The results show that the LIDTN scheme is suitable for large-scale constellations, the EPFS algorithm can reduce the network overhead during data transmission, EBDA can reduce the bundle drop rate, and VAA can reduce the end-to-end latency. LIDTN provides a new solution for large-scale constellation communication.

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