Hybrid Clustered Peer-Assisted DASH-SVC System

A Window-Based, Server-Assisted P2P Network for VoD Services with QoE Guarantees

“…From (10) it can also be observed that abundance condition could be achieved by controlling , the number of windows. Figure 3 shows that, by reducing , the required value of −1 to guarantee abundance is slightly relaxed (increased); however, reducing deteriorates the QoE parameters, as it is widely discussed in Sections 5-7 of this paper.…”

“…Schemes that incentivize cooperation among peers to increase the upload network capacity have been proposed on works such as [6][7][8]20]. Finally, the main focus of some other research works has been on defining schemes that determine which peers are the most appropriate to serve a downloader (given the network topology, the video distribution, and a level of cooperation among peers) in order to improve a QoS or QoE parameter; some examples of this kind of works are [7,9,10,14,15,20]. The scheme considered in this paper belongs to the last class, because the proposed window-based scheme finds the best peers capable to provide service to a given downloader; however, our contribution is not limited to that, since in addition we propose an efficient scheme to distribute the server resources.…”

“…Rate is clearly a variable that could be controlled according to (10). In Figure 2, the abundance condition for different values of the departure rate for a leech ( ) is presented.…”

“…It can be seen that as departure rate for a leech increases, it is necessary to increment the time that seeds remain in the system; that is, the seeds departure rate should be also reduced, since there are fewer leeches sharing the file. Hence, by using (10), and by measuring the arrival and departure rates for a leech, the network manager has a tool to offer an acceptable performance of the system by allowing all leeches to download windows at their maximum capacity. In other words, our analysis allows finding an appropriate value for this control variable.…”

“…Services like Live IPTV and Video on Demand (VoD) have been considered in the context of P2P networks in [1][2][3][4][5][6][7][8][9][10][11].…”