Congestion Control In Computer Networks By Using Load Factor

Joz Mohebbi Vahed, Mahdi (2016) Congestion Control In Computer Networks By Using Load Factor. Masters thesis, university of Mohaghegh Ardabili.

Preview

Text (استفاده از ضریب‌بار برای کنترل ازدحام در شبکههای کامپیوتری) Mahdi Joz Mohebbi Vahed.pdf Download (635kB) | Preview

Abstract

Abstract: Due to increased number of users and the increasing spread of computer networks, congestion control of the network is one of the major challenges for researchers. Congestion uncontrolled rise to problems such as disposal of packages, bandwidth for the retransmission packet loss, performance degradation and other problems. The mechanisms that have the ability to control congestion and manage it as well as to make maximum use of available resources in the network, is necessary. Methods to control congestion are divided into two categories, expressed or implied, which each have their strengths and weaknesses. With explicit declaration of congestion methods, information about the network status send to abecedarian of flow by using of explicit congestion of router bits, and thus this method is better than implicit declaration of congestion methods (guess the congestion of the non-receipt of ACK or timer expiretion). For example, VCP is one of these protocols have been proposed in 2005. The protocol at the specified intervals, recognized the severity of congestion and then calculating the Load Factor (as signal of congestion and congestion level) per router and inform The transmitter by the ECN bits in the header of protocol IP, about severity of congestion. The transmitter is based on the bits received, adjusts its sending rate. The weakness of this method is that the transmitter relying on announced three status , can not have precise knowledge of network congestion level. This study is to provide a method, just using one bit of the two bits in the header of the IP, inform the sender from the exact number of congestion and thus improve justice, increase efficiency and reduce volatility in the sender's congestion window size.

Actions (login required)

View Item