Bandwidth Allocation to Interactive Users in DBS-Based Hybrid Internet.

摘要

We are motivated by the problem of bandwidth allocation to Internet users in DBS-based Hybrid Internet, where the Network Operations Center (NOC)- scheduler controls the amount of service provided to each user, by using packet scheduling and better management. Such a system exploits the ability of satellites to other high bandwidth connections to large geographical areas, and it delivers low-cost hybrid (satellite-terrestrial) high-speed services to interactive Internet users. In this system, it is important to reduce the delay that users experience. We analyze several bandwidth allocation policies at the Network Operations Center (NOC) of a DBS-based hybrid Internet network. We consider the problem of optimal scheduling of the services of interactive users in the DBS-based hybrid Internet con guration. We show that, for the interactive Internet users, the Most Delayed Queue First (MDQF) policy, which serves the queues starting with the most delayed queue, is providing the minimum delay, when compared with the Equal Bandwidth (EB) and Fair Share (FS) allocation policies. The MDQF policy is shown to be optimal with respect to a performance metric of packet loss due to queuing time constraints. The impact of the scheduling policies on the Hybrid Internet system's performance, is analyzed in the context of the interplay between the NOC queuing system (and its bandwidth allocation policies) and the underlying transport protocol (TCP), and we show the effectiveness of the MDQF policy in the presence of TCP congestion control algorithm. We also present simulations in which the Internet server sources send selfsimilar.