Dissertation > Excellent graduate degree dissertation topics show

Researches on Quality-of-Service Technologies in IP Networks

Author: ChenXiaoFeng
Tutor: PingLingZuo;PanXueZeng
School: Zhejiang University
Course: Computer Science and Technology
Keywords: IP network Quality of Service DiffServ IntServ RSVP Scavenger Service Assured Service Fairness AIMD Mobile IPv6
CLC: TP393.02
Type: PhD thesis
Year: 2006
Downloads: 715
Quote: 8
Read: Download Dissertation


The reason why Internet can expand to such an enormous scale today mostly contributes to the Best-Effort design principle in TCP/IP protocol stack. This principle greatly brings down the complexity and the burden of the network core and makes it able to scale up quickly. As the fast expanding of network scale, various new network services emerge. Internet is now changing into an integrated network that transmits both data and multimedia flows. Also, the carrying foundation of traditional telecom applications is shifting into packet switching network based on IP technology. The shortcoming that original IP network lacks QoS (Quality of Service) warranty becomes increasingly critical. How to achieve QoS in IP network has become a key issue in next generation network development.This dissertation first reviews the elements of TCP/IP network and gives the definition of IP QoS together with the way to its realization. Then, on the basis of relative research works and progresses, the dissertation presents following innovative works:1. To deal with the particularity of Scavenger Service (SS) from Internet2 project, a logarithmically adaptive queue-scheduling algorithm named LAWRRQ is presented. In the algorithm, the number of active Scavenger Service flows is calculated by a time sliding window algorithm, and the bandwidth allocated for Best-Effort (BE) flows and SS flows is accordingly tuned in a logarithmical way. The tradeoff between flow number counting accuracy and cost is made by the characteristic of the logarithmic function. A looking-up table composed of flow number and total round robbing slice number resolves the computing complexity. A protection for BE queue in buffer management is also introduced. Simulation results show that compared with current algorithms recommended by Internet2, the algorithm provides more reliable bottom bandwidth guarantee for Scavenger Service flows when protecting BE flows well, and has better performance and robustness.2. The fairness between Scavenger Service micro-flows is studied. The problem that Scavenger Service is not applicable for non-adaptive flows is pointed out. Then, the study on performance of FRED queue management algorithm dealing with Scavenger Service shows the problem of many misidentifications with adaptive flows. Based on this, A MFRED algorithm is presented, in which a mechanism designed for misidentification correcting is added. Simulation results show that MFRED identifies non-adaptive flows and balances the bandwidth allocation effectively while misidentifications being greatly reduced. By means of study on therelationship between parameter nactive and actual active SS flow number in MFRED, a method of estimating SS flow number by nactive to tune the guarantee bottom bandwidth of Scavenger Service is presented and identified.3. An IE AM marking algorithm for proportional bandwidth distribution of Assured Service in DiffServ is presented. In the algorithm, the AIMD control thinking from TCP is introduced into the aggregate flow marking rate tuning. The core routers judge the congestion level according to the average length of IN queue and send out feedback information by marking the packets being forwarded to inverse direction at the moment of congestion. Based on the feedback information, the edge routers adjust their target rates in an AIMD way without communications with other edge routers. The presented algorithm is simple, adaptive and scalable. Simulations shows that the proposed algorithm realizes proportional bandwidth allocation according to committed information rate without communications between different edge routes under different network conditions.4^ Current research works on wireless mobile IP QoS are Summarized and the different schemes are compared with each other. These works are divided into four aspects: management of resource reservation, re-establishment of reservation path, design of mobile agent and integration of RSVP and mobility management. Based on some mechanisms mentioned in summarization, a QoS guarantee scheme in Fast Handovers for Mobile IPv6 architecture is presented. Finally, some basic simulations are made.

Related Dissertations

  1. Reseach of Mobile IP Routing in Satellite Networks,TN929.5
  2. Research of SIP and the Application of SIP in Video Communication,TP393.04
  3. The Comparison and Contrast between the Health Care System in the United Kingdom and That in the United States,R199
  4. Research on Fairness and Justice under the Vision of Harmonious Society,D61
  5. Fairness Research of Entrance Examination System Since 1978,G632.474
  6. An Approach for Business Process Oriented Service Dynamic Composition,TP393.09
  7. A Study of the Influence of Social Emotions and Social Norm on Fairness Behavior in Dictator Game,B842.6
  8. The Research on Fair Justice Ideological of Hu Jin Tao,D61
  9. Citizen participation in local tax department performance evaluation studies,F812.42
  10. Information-oriented physical systems IEEE802.15.4MAC protocol analysis and optimization,TP212.9
  11. IP QoS technology research,TP393.09
  12. Research on Education Fairness in Rural Areas,G521
  13. Research on the Adjustment of the Liquidated Damages,D923.6
  14. Jinjiang Hotel touched culture in the service quality management plan and its implementation,F719
  15. The Research of Service Quality Management of Mobile Communication Industry in the Perspective of Customer Satisfaction,F626;F224
  16. The Relationship of Service Quality and Satisfaction at Insurance Assessment,F842
  17. The Research on Routing Protocols and Related Technology of Wireless Mesh Network Based on QoS,TN929.5
  18. Research on Key Technology in GMPLS Based Optical Burst Switch Networks,TN929.1
  19. Research and Improvement on TCP Performance in Heterogeneous Wireless Networks,TN929.5
  20. The Research and Implementation of Traffic Control System Based on Linux,TP393.06
  21. Discuss the Administrative Hearing System of China and Perfection,D922.1

CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Computer network > General issues > Computer network architecture and design
© 2012 www.DissertationTopic.Net  Mobile