International Conference on Computer Engineering and Technology, 3rd (ICCET 2011)
89 End-to-End Available Bandwidth Estimation Scheme for the Bi-Directional Satellite Networks
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This paper presents an efficient and accurate available bandwidth estimation algorithm for satellite links which generally have long propagation delay. Either the method using the rate of returning ACKs or the method using sender's timestamp is adopted for the bandwidth estimation algorithms to enhance TCP performance in the literature. However, these methods have an influence from the return-link(TCP receiver to TCP sender) traffic variation, especially in the asymmetric satellite links. To overcome these limits, our algorithm performs in two steps. A forward path delay is calculated at the sender with the receiver sending time for an ACK packet in the first step. And in the second step, the forward path delay is updated more delicately through removing unrelated part from the forward path delay, and is applied for available bandwidth estimation. The simulation results show that our algorithm can avoid the influence of the traffic variation in the return path(e.g., ACK compression, DAMA delay), and estimate the available bandwidth over the forward path more accurately.