Research On Queue Buffer Management Strategy And Algorithm For The Non-adaptive Flow In DiffServ Architectute

With the development of network technology,the requirement of the real-time business and multimedia applications based on network is increasing.The guarantee of QoS(Quality of Service) has become one of the research hotspots on network. Differentiated services model put forword by IETF provides an effective way to solve the QoS problem.,This article will focus diffserv flow under the non-adaptive bandwidth allocation issues and the queue buffer management issues.DiffServ model provides different QoS services based on aggregated flows. The basic idea is to classify the traffic according to QoS requirements on the network edge, and different class realizes different forwarding characteristic on the core router. Queue buffer management is to manage buffer resources in the network transmission node. In the process of packet transmission, the network node which packet flows through usually uses the queue buffer, delay forwarding to improve the bandwidth utilization of output link. When packets arrive at the queue, the queue buffer management mechanism decides whether to allow the packet to enter into the buffer queue according to certain information and strategy. When the Adaptive flow meet the Non-adaptive flow in the same AF, As the flow will reduce congestion when the sending rate adaptation rather than an adaptation to maintain the original rate of flow is sent, Thus will lead to suppression of non-adaptive flow occupies more bandwidth.But adaptive flow, can not meet the fair treatment.In this paper, the non-adaptive flow bandwidth allocation strategy of early discard part of the work on the packet before entering the queue, and its aim is to ensure acceptance of the total flow close to the bottleneck bandwidth.Therefore, a improved queue management algorithm with the combination to form a complete router algorithms.This improved algorithm combines RIO-C algorithm used in DiffServ networks with ARED algorithm, and applies RLS algorithm to predictive traffic. It aims at improving the EF service’s performance in the DiffServ network. Under the NS2network simulation environment, First PRIO-C algorithm is verified to ensure that the algorithm could reduce the latency and packet loss rate, and could stable latency jitter effectively Then in turn Early Discard non-adaptive flow combined with the RED algorithm, on the non-adaptive flow Early Discard fair distribution of bandwidth in the effectiveness of the verification; Finally, the early discard of non-adaptive flow algorithm and PRIO-C algorithm is composed of a complete router algorithm NPRIO-C.Verify that the algorithm taking into account the fairness of bandwidth allocation, while reduce the latency and packet loss rate, and could stable latency jitter effectively, thus enhanced the QoS performance.