Xu Minghai Social Practice Report
- ZTE Research Funded Project Research For young students, the summer vacation is an adjustment period, rest period and transition period. However, under the new historical conditions, we must not only bear certain social responsibilities, but also face increasing competitive pressures from both international and domestic levels.
For graduate students who are part of young students, there should be a sense of worry. In the rest of the summer, the summer vacation can pay more attention to the latest developments in the relevant fields of the profession, and commit to the combination of theory and practice of their own research direction.
Since we undertook the “IP Network QoS Research” funded by the ZTE Research Fund, before the start of the summer vacation, we made a comprehensive arrangement for the summer vacation time, mainly doing two things. First, we paid attention to QoS research at home and abroad. The latest tension, and then the simulation of the results of IP network QoS theory research, to lay a certain foundation for the next deployment to the actual network.
With the rapid development of the Internet, especially the extensive application of WWW services, IP has become the mainstream technology of information networks. The IP-based Internet has occupied a wide range of markets due to its flexible access and good scalability, and has begun to enter the field of broadband multimedia communications from the data field. The evolution of IP-based technology in the global information network has become the consensus of the industry. IP network technology has become a research hotspot in the entire information industry including the computer industry, the telecommunications industry and the broadcast and television industry.
Broadband multimedia communications, including audio/video applications, require the network to offer two capabilities. One is high-speed transmission capability, and the other is multi-service QoS support capability. In recent years, due to the successful development of large-capacity optical fiber transmission systems and high-speed routers, especially the breakthrough of DWDM technology, the bandwidth of IP networks has grown unprecedentedly. It was once proposed to solve the quality of service problems by using excessive resource allocation methods. That is, use sufficient bandwidth to exchange for the required QoS.
Although network capacity is growing at an extremely fast rate, today we still have to face the problem of network congestion today and for the foreseeable future. Although Internet service providers have installed transoceanic cables and used cable modems and xDSL to connect the network to the home, the fact is that most home users still use the Modem to connect at 56Kb/s or lower. Enter the Internet; most businesses still rely on relatively slow private line communications. Although we have built a Gbit LAN, it is still not enough to support a large number of enterprise servers and meet the needs of a large number of new applications. That is, the growth of bandwidth cannot quickly eliminate congestion problems for two reasons: The application of bandwidth - the growth bandwidth makes the use speed increase, which stimulates the demand for bandwidth; high-capacity fiber - when the load of two fibers enters the third root, congestion will be inevitable. The facts show that this kind of thinking, which relies solely on increasing the bandwidth of the network, is not feasible. It is necessary to study the optimal allocation technology of network resources to avoid uncontrolled network expansion.
The traditional IP network is designed to provide equal services for everyone and all applications, so it can only provide a single Best-effort service, which cannot guarantee delay, delay jitter, packet loss rate, etc. for carrier-class services. Critical service quality. Although the dominant ATM in the early 1990s had a complete set of QoS mechanisms, it was based on connection-oriented control technology, and although it could be borrowed, it could not be easily ported to a non-wired IP network. Therefore, how to provide multi-service QoS in IP networks has become a hot research topic in the information industry.
IP QoS is a very active network research branch. There are many research progress and technical standards. Although it is not yet practical, it has indeed laid a good technical foundation for further research. The main organizations that study IP network QoS technology internationally are IETF, ITU-T, EU IST, ETSI and IEEE.
In this context, many research institutions and research institutes in China have also carried out related research. This research not only has important theoretical significance, but also is a practical problem that needs to be solved urgently in China. ZTE Corporation is a telecom equipment manufacturer with terminal application, access, and local to core network products. On the one hand, it has a good network environment and test platform for studying end-to-end IP network QoS technology. On the other hand, It also faces the problem of how to transition from traditional network technology to IP packet technology. The in-depth study of this topic will be of great significance to the company's technology development, especially the current research and development of next-generation networks. Our project has been fully launched a year ago. The task of the summer is mainly to realize the structural model, control algorithm and related agreements proposed in the previous work in the network simulation software ns to find the deficiency and solve the problem.
Ns is an open source software. In order to achieve our simulation purpose, to increase the function module, the first thing to do is to digest and understand the structural features of the ns software, and secondly, to write the code according to the algorithm model, and again to write the code. The original code is integrated into ns, and the joint debugging is performed. Finally, the simulation results are analyzed.
In the first phase of the summer, our project team members carefully read the source code in conjunction with ns manual, and started discussions on a regular basis, gradually have a clear understanding of ns software, and then focus on analyzing and conquering the function module code related to our project. And in turn into ns, obtained some preliminary simulation results.
In this process, we also encountered some problems, such as ns software structure, understanding of discrete event models, specific scheduling and parameter setting of queue management algorithms, etc. In this case, we discuss and think through , experiments and search related materials have been resolved and further understanding.
Time is fast, and it’s almost in September. Looking back on summer vacation, it’s a happy and fulfilling time in life. It has both leisure and calm of holidays, fulfillment and fulfillment of projects, and more importantly, this It is also an attempt of theory and practice. It is a theory-guided practice and a practice of enriching the theory. In this process, we have gained the training of teamwork, the improvement of independent thinking ability, and at the same time consolidate the professional skills, and to build into the future. The great practice of socialism with Chinese characteristics lays a solid foundation.
Suffering forever, learning constantly!
For graduate students who are part of young students, there should be a sense of worry. In the rest of the summer, the summer vacation can pay more attention to the latest developments in the relevant fields of the profession, and commit to the combination of theory and practice of their own research direction.
Since we undertook the “IP Network QoS Research” funded by the ZTE Research Fund, before the start of the summer vacation, we made a comprehensive arrangement for the summer vacation time, mainly doing two things. First, we paid attention to QoS research at home and abroad. The latest tension, and then the simulation of the results of IP network QoS theory research, to lay a certain foundation for the next deployment to the actual network.
With the rapid development of the Internet, especially the extensive application of WWW services, IP has become the mainstream technology of information networks. The IP-based Internet has occupied a wide range of markets due to its flexible access and good scalability, and has begun to enter the field of broadband multimedia communications from the data field. The evolution of IP-based technology in the global information network has become the consensus of the industry. IP network technology has become a research hotspot in the entire information industry including the computer industry, the telecommunications industry and the broadcast and television industry.
Broadband multimedia communications, including audio/video applications, require the network to offer two capabilities. One is high-speed transmission capability, and the other is multi-service QoS support capability. In recent years, due to the successful development of large-capacity optical fiber transmission systems and high-speed routers, especially the breakthrough of DWDM technology, the bandwidth of IP networks has grown unprecedentedly. It was once proposed to solve the quality of service problems by using excessive resource allocation methods. That is, use sufficient bandwidth to exchange for the required QoS.
Although network capacity is growing at an extremely fast rate, today we still have to face the problem of network congestion today and for the foreseeable future. Although Internet service providers have installed transoceanic cables and used cable modems and xDSL to connect the network to the home, the fact is that most home users still use the Modem to connect at 56Kb/s or lower. Enter the Internet; most businesses still rely on relatively slow private line communications. Although we have built a Gbit LAN, it is still not enough to support a large number of enterprise servers and meet the needs of a large number of new applications. That is, the growth of bandwidth cannot quickly eliminate congestion problems for two reasons: The application of bandwidth - the growth bandwidth makes the use speed increase, which stimulates the demand for bandwidth; high-capacity fiber - when the load of two fibers enters the third root, congestion will be inevitable. The facts show that this kind of thinking, which relies solely on increasing the bandwidth of the network, is not feasible. It is necessary to study the optimal allocation technology of network resources to avoid uncontrolled network expansion.
The traditional IP network is designed to provide equal services for everyone and all applications, so it can only provide a single Best-effort service, which cannot guarantee delay, delay jitter, packet loss rate, etc. for carrier-class services. Critical service quality. Although the dominant ATM in the early 1990s had a complete set of QoS mechanisms, it was based on connection-oriented control technology, and although it could be borrowed, it could not be easily ported to a non-wired IP network. Therefore, how to provide multi-service QoS in IP networks has become a hot research topic in the information industry.
IP QoS is a very active network research branch. There are many research progress and technical standards. Although it is not yet practical, it has indeed laid a good technical foundation for further research. The main organizations that study IP network QoS technology internationally are IETF, ITU-T, EU IST, ETSI and IEEE.
In this context, many research institutions and research institutes in China have also carried out related research. This research not only has important theoretical significance, but also is a practical problem that needs to be solved urgently in China. ZTE Corporation is a telecom equipment manufacturer with terminal application, access, and local to core network products. On the one hand, it has a good network environment and test platform for studying end-to-end IP network QoS technology. On the other hand, It also faces the problem of how to transition from traditional network technology to IP packet technology. The in-depth study of this topic will be of great significance to the company's technology development, especially the current research and development of next-generation networks. Our project has been fully launched a year ago. The task of the summer is mainly to realize the structural model, control algorithm and related agreements proposed in the previous work in the network simulation software ns to find the deficiency and solve the problem.
Ns is an open source software. In order to achieve our simulation purpose, to increase the function module, the first thing to do is to digest and understand the structural features of the ns software, and secondly, to write the code according to the algorithm model, and again to write the code. The original code is integrated into ns, and the joint debugging is performed. Finally, the simulation results are analyzed.
In the first phase of the summer, our project team members carefully read the source code in conjunction with ns manual, and started discussions on a regular basis, gradually have a clear understanding of ns software, and then focus on analyzing and conquering the function module code related to our project. And in turn into ns, obtained some preliminary simulation results.
In this process, we also encountered some problems, such as ns software structure, understanding of discrete event models, specific scheduling and parameter setting of queue management algorithms, etc. In this case, we discuss and think through , experiments and search related materials have been resolved and further understanding.
Time is fast, and it’s almost in September. Looking back on summer vacation, it’s a happy and fulfilling time in life. It has both leisure and calm of holidays, fulfillment and fulfillment of projects, and more importantly, this It is also an attempt of theory and practice. It is a theory-guided practice and a practice of enriching the theory. In this process, we have gained the training of teamwork, the improvement of independent thinking ability, and at the same time consolidate the professional skills, and to build into the future. The great practice of socialism with Chinese characteristics lays a solid foundation.
Suffering forever, learning constantly!
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