Dissertation > Excellent graduate degree dissertation topics show

Research of Active Queue Management in Network QoS Control

Author: LvZhaoQi
Tutor: ZhangShunYi
School: Nanjing University of Posts and Telecommunications
Course: Applied Computer Technology
Keywords: computer network Quality of Service (QoS) active queue management congestion control load changing
CLC: TP393.06
Type: Master's thesis
Year: 2011
Downloads: 29
Quote: 0
Read: Download Dissertation

Abstract


With the rapid development of the network and multimedia technology, both the network users and network applications are rapidly increasing, network users put forward higher request to QoS. The network QoS control has become one of the most important research fields. Queue management plays a very important part in the network transmission and is one of the key technologies of network QoS control and network congestion control.This thesis analyzes the current status and developing trend of research to queue management, analyzes and researches the classical active queue management algorithms, and then summarizes them. The analysis and simulation to RED reveals that the calculation of the average queue length in RED algorithm results in a poor response to the beginning and end of congestion. A modified algorithm called Adaptive-Weight RED (AWRED) is proposed in the thesis. The primary objective of AWRED is to optimize the calculation of the average size of the queue used for congestion avoidance and to consequently reduce the time required by RED to load changing and reduce the total loss of packets. Simulation results show that the proposed AWRED algorithm significantly improves the response time, throughput and delay of RED gateways and shows good robustness.Analysis of the RIO-C algorithm shows that correctly setting the parameters of RIO-C may prove difficult and error-prone, the performance of RIO-C is very sensitive to network conditions, the delay jitter is too big and it has the problem of bandwidth skew. An adaptive AQM algorithm called MRIO is proposed. MRIO bases on DiffServ and supports trustworthy routing. Various theoretical analysises are made to the algorithm and an extensive series of simulations was carried out using the NS-2 network simulator, using diverse network topologies and loads. Simulation results show that MRIO can keep average queue close to a target size while still providing protection for priority packets and fariness of bandwidth allocation and significantly alleviates the bandwidth skew problem, so the algorithm can better realize network QoS control.

Related Dissertations

  1. The Research of TCP Congestion Control Mechanisms in Satallite Networks,TN927.2
  2. Research on Congestion Control Mechanism of Stream Control Transmission Protocol,TN915.04
  3. Research on the Quality of Service Technology in IP Network,TN915.09
  4. Fault Diagnosis and Tolerance Research for Train Control System and Its Computer Networks,TP393.06
  5. Research of Internet Congestion Control Mechanism and Stability Analysis,TP393.06
  6. Research on Active Queue Management in Routers,TP393.05
  7. The Research on Algorithm for Congestion Control Based on Active Queue Management,TP393.06
  8. Research of Network Adaptive Congestion Control Algorithm in Active Queue Management System,TP393.06
  9. Adaptation for non-adaptive streams flow and congestion control mechanism of the network layer,TP393.06
  10. Study on Congestion Control Base on Middle Nodes,TP393.06
  11. Network Congestion Control Method Based on QoS Routing Model,TP393.06
  12. Research of Relatived Alogorithm in the Network Congestion Control Field,TP393.06
  13. On Active Queue Management Algorithms for Network Congestion Control,TP393.06
  14. On Congestion Control Based on Active Queue Management Algorithms,TP393.06
  15. On Congestion Control of Networks Based on Active Queue Management,TP393.06
  16. The Congestion Control Algorithms of Large-Delay Networks,TP393.06
  17. Analysis of RaQ Algorithm in Network Congestion Control,TN915.06
  18. On Congestion Control Mechanism and Algorithm for TCP/IP Networks,TN915.06
  19. Research of Congestion Control Algorithm in Trustworthy Network,TP393.06
  20. Research on Traffic Control Technology of Cognitive Network Based on Service-Aware,TP393.02
  21. The Research and Implementation of Monitoring System Base on Battalion of Missile Force on the Plateau Cold Regions,TP277

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Computer network > General issues > Computer networks, test , run
© 2012 www.DissertationTopic.Net  Mobile