Network performance analysis when using routers congestion management algorithms

Abstract

Multimedia applications, such as VoIP and video conferencing applications, generate traffic with characteristics that differ significantly from traffic generated by other applications, as they have more stringent delay and packet loss requirements, for example the quality of VoIP applications is affected by fluctuation and packet loss. Waiting delays in network nodes, and video call quality can deteriorate significantly during periods of network congestion, which makes measuring network performance and identifying techniques that can be applied to deliver appropriate quality for these applications.In this research, we got acquainted with some models used in networks to achieve quality of service, which are the INTSERV model, which is represented in the resource reservation protocol RSVP, which depends on building a virtual circuit over the Internet along the path between the two connected parties, and the DiffServ model, in which the classification of Pack the data into classes and deal with them later in a differentiated manner to meet the requirements of applications that require strict restrictions in the network, where we studied the effect of applying FIFO-PQ-WFQ-CQ scheduling algorithms in routers.In our experimental study, we relied on the OPNET emulator to build network models and apply quality of service mechanisms in them, and we used delay, oscillation, packet loss and MOS as criteria for performance analysis and quality measurement, in light of the use of different encodings for the voice application, in order to study the effect of using these encodings on network performance.The results of the intensive simulation showed the superiority of using the CQ scheduling algorithm over the rest of the algorithms, as the delay value decreased to less than 100 milliseconds, the JITTER value decreased to approximately 0.005 seconds, and the MOS value increased to 4.5 throughout the simulation time. These results are excellent for the quality of service in multimedia networks.