This scheme improves the network performance in three aspects: next hop selection, congestion control mechanism, and acknowledgment mechanism. 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. Applying traditional routing algorithms has disadvantages such as high overhead, high end-to-end latency, and low message delivery rate. We find that 1) no combinations of alpha and beta, or sampling strategies, perform consistently better than others under the different levels of background traffic 2) lower minimum RTO settings than the recommended 1-second minimum will work when there is moderate background traffic, but the 1-second minimum is best when there are higher levels of congestion and 3) using the standard timer settings but not using the TCP SACK option and congestion control mechanisms degrades bare server performance for some levels of background traffic.Ī 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. We also study performance with different minimum RTO settings, and compare the performance of the bare PC Web server using the recommended timer settings with the performance of the Apache and IIS Web servers running on Linux and Windows respectively.

We evaluate server performance in a test LAN with various settings of the alpha and beta constants used for computing SRTT and RTTVAR in the presence of varying levels of background traffic generated by conventional systems.

We study the performance impact of recently recommended TCP retransmission timer settings using a bare PC Web server with no operating system or kernel running in the machine.

Wireshark rto