Evaluation on Required Time and Arrival Order of Blocks for Segmented File Downloading Methods Using PR-SCTP and Unordered Delivery
Junichi Funasaka, Kazuya Takeda · 2016
To yield better performance on highly lossy networks, a segmented file download method composed of both Time-to-Live (TTL) based PR-SCTP which limits the retransmission time and unordered delivery which alleviates the influence of Head-of-Line blocking problem has been proposed. However, the existing method did not take the arrival order of blocks into account. In this paper, since the method can be applied to order-sensitive applications such as HTTP streaming, we evaluate the number of out-of-order arrivals for the existing method and two newly proposed methods: a delayed retrying method which does not worry the arrival order at all and a stochastic retrying method. The evaluation results on the methods in terms of the arrival order of blocks and the required time for the download completion are reported in this paper, using real machines and network emulators which can also realize the wireless LAN features. The relation between the download time and the arrival order of blocks clarified in this paper must be important reference data to offer assurance services to users with various demands.