Research And Simulated Implementation Of Modified RIO-C Algorithm Based On Differentiated Services Networks

Multimedia information is transported besides the data on the Internet with the development of multimedia technical, whereas it has different demand for quality of service compared with the data.Differentiated Services architecture has recently become a nice service model for addressing QoS issues in IP networks. Besides best effort service can differentiate the priority of services.This article focus on the QoS based on DiffServ and queue management algorithm to achieve improvements in the area of algorithm research. Papers analyse the network congestion issue exhaustively and study the causes of congestion and its research actuality, focusing on performance analysis of several active queue management algorithm, such as DropTail algorithm was too simple, it can't avoid congestion and provide priority; RED algorithm adopt the average queue length rather than the actual queue length as the congestion level of instruction, it can avoid congestion, at the same time avoid the "global synchronization" and "deadlock", but it also can't provide priority; RIO-C algorithm solves the problem of packet priority, but the algorithm in the light network load, which led to the possibility of network congestion is small, discard excessive packet when the arrival of packet, especially high discard priority data packet; in contrast, when network load is weight, the intensity of dropping arrival packet is not enough, which can increase the possibility of network congestion and influence network quality of service.In order to address this issue, this article modify RIO-C algorithm, use the quadratic function of average queue length to replace the intrinsic calculating method, so that the discard probability of packet increase by the curve as the size of the increase in the average queue length, thus reducing network congestion in the early stage of data packet discarding probability, an increase of network congestion later the data of the discarded packet probabilitythrough the simulation experiments of the modified RIO-C algorithm, proved that it can realize differentiated services and enhance the utilization efficiency of network bandwidth.