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The Research and Implementation of IP Network Real-Time Classes Quality of Services

Author: GongZhiWei
Tutor: DengFang
School: Beijing University of Posts and Telecommunications
Course: Computer Science and Technology
Keywords: Quality of service Queue scheduling CBQ Slice into technology
CLC: TN915.09
Type: Master's thesis
Year: 2010
Downloads: 52
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Abstract

With the application of the network, more and more enterprises and user information through the network transmission, into the explosive growth in the amount of data on the network, which put forward higher requirements to the network router or firewall performance. With the rise of the next generation network, audio and video and other multimedia applications, more and more, more and more business data that require low latency guarantee, and how to ensure that the real-time nature of these applications is becoming increasingly important. In order to handle the amount of information over the transmission capacity in the network, there is the quality of service (QoS, Quality of Services) techniques, trying to meet the different types of information via the QoS technology transmission requirements. QoS for the different types of business data packets provide quality assurance, but QoS can not completely guarantee network congestion occurs, the appropriate queue scheduling mechanism is particularly important when congestion occurs, queue scheduling mechanism determines the packet scheduling has order, but also to some extent determines the transmission capacity of the network. Thesis QoS related technologies, including QoS technical indicators, functional components, and has proposed two architectures, pointed out the advantages of the limitations of integrated services and differentiated services. Thesis research network congestion control technology the WRED technology, including TCP global synchronization and resolve this issue as well as several common network queue scheduling mechanism, including FIFO, PQ, CQ, and WFQ. Next thesis focuses on the scheduling mechanism of class-based queuing (CBQ) to study, improve and achieve, CBQ PQ queue exists \problems. CBQ packet into EF, AF and BE three categories, each different type of scheduling strategy to ensure low latency for real-time business data, but also to ensure the other queues, especially the BE queue reasonable network bandwidth. But the the CBQ mechanism for low-speed link long data packets scheduling of real-time business data relatively large impact, slice into the technology proposed a solution to the above problem. Packets in the link layer fragmentation and cached to slice temporary queue in a small piece each time you send a message, so real-time messages interspersed slice which send real-time packet transmission delay can be greatly reduced . On this basis, the paper gives a combined the CBQ mechanism and slice into the technology solutions to guarantee service quality of real-time business data packets can be solved by this program, provides a reference for the design of packet scheduling mechanism programs. Finally, the paper gives the main points of the program and verified by experiments in the program, and demonstrate the feasibility of the program.

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