Xiaoping Zeng

TCP congestion control algorithm for heterogeneous Internet

The available bandwidth, round trip time (RTT) and packet loss rate can vary over many orders of magnitude, which characterizes the heterogeneity of the Internet. To cope with the heterogeneity in Internet congestion control, we propose a new TCP protocol known as INVS that contains three key components: (1) INVS employs an exponential-function-based growth function of the congestion window, which is more efficient than the cubic function in CUBIC; (2) INVS introduces an adaptive increase factor into the growth function to ensure that the window growth rate matches the path condition, and this increase factor measures the path condition using a custom function of the available bandwidth and minimum RTT; (3) INVS adopts an adaptive queue threshold in the loss classification scheme to improve the performance of TCP over lossy links. In addition, INVS requires modification only on the TCP sender and traces the path capacity to enable quick convergence of the congestion window. The performance analysis and evaluation show that INVS achieves good throughput, fairness, RTT-fairness and utilization in heterogeneous networks.

Degree Distribution of Arbitrary AANET

Taking the safe distance between two adjacent planes in the same airline into account, we give a model for the multiairline aeronautical ad hoc network (AANET). Based on our model, we analyze the plane’s degree distribution of any arbitrary AANET. Then, the expressions of the degree distributions of one single plane and the whole networks are both worked out and verified by the simulations, in which we generate several random AANETs. Since our model is a reasonable abstraction of the real situation, the theoretical result we get is very close to the result of the real networks, which is also shown in the simulations.