Journal of Networking and Telecommunications(TRANSFERRED)

Abstract Frame relay is developed from integrated services digital network, in 1984, recommended as the International Telegraph and telephone Consultative Committee (CCITT) standard, in addition, TIS the United States authorized by the American National Standards Institute Standards Committee also made some preliminary work on frame relay. Due to the optical fiber network of the bit error rate (less than 10^-9) than early telephone network error rate (10^-4~10^-5) is much lower, therefore can reduce some X.25 procedures, which can reduce processing time and improve network throughput. Frame relay is produced in this environment. Is provided by the frame relay data link layer and physical layer specification, any higher-layer protocols are independent of the frame relay Protocol, therefore, greatly simplifies the implementation of frame relay. Frame Relay LAN interconnection is one of the main application, especially when the LAN interconnection over a wide area network, using frame relay can reflect the low network delay, the advantages of low cost, high bandwidth utilization. Frame relay is an advanced WAN technologies is a form of group communication, except that it will be between X.25 packet switches in the network, error recovery, to prevent the obstruction of the process was simplified.

Abstract The network communication is realized and developed based on the gradual improvement of the computer network. Although the communication system itself is not equivalent to the computer network, but there are many integration and connection in current communication system and the computer network, which has formed a complementary and mutual development of the situation. With the emergence and application of new systems and computer network technologies, such integration and development will be more in-depth and closer. This article is focus on the computer network and the communication system, and does a brief analysis of the status quo, so that it is easy to understand by the majority of readers in the shallow level.

Abstract China's history and culture are long. It is the famous state of etiquette. People through a certain form of rituals and a certain way of cultural activities to carry out their thoughts and feelings. In real life, everyone often uses a series of applications such as traditional letters, business cards, stickers, announcements, essay inscriptions, couplets, modern such as telegraph, fax, express mail, e-mail and so on. These applications include rich ritual content, with a strong cultural color of the Chinese nation. From the earliest Pigeon biography to today's videophone, the traditional communications industry has a complex development process. At different times have different roles, and also has a lot of convenience and inconvenience. Because of this inconvenience, Internet in real life is more widely used, so to a certain extent make up for this shortcoming, this article will focus on the Internet and traditional communications industry in order to explore the relationship between both and the future development trend.

Abstract We know that in many different technologies, many wireless channels will be partially overlapped. However, due to the interference effects in such partial overlapping channels, they are often avoided using them simultaneously. In this paper, we propose to use the method of the system for the first time to try to simulate some overlap between channels. Through this model, we show that the use of partially overlapping channels is not always harmful. In fact, if careful use of some of the overlapping channels often leads to significant improvements in spectrum utilization and application performance. We demonstrate this view through analysis, as well as through detailed application layer and MAC layer measurements. In addition, we illustrate the benefits of the model we developed by using it to directly enhance the performance of two previously proposed channel allocation algorithms - in wireless LANs and other in multi-hop wireless mesh networks. Through a detailed simulation, we show that in these two cases, the use of partially overlapping channels can improve the application throughput factor of the terminal to the terminal between 1.6 and 2.7, depending on the wireless node density. Finally, we observe that some of the overlapping concepts can be flexibly designed to design efficient channel access mechanisms in emerging software radio platforms.

Abstract In December 2013, China's Ministry of Industry and Industry officially issued three licenses to the three operators, 4G in China officially to commercial. In the February 2013, the EU announced that it will allocate 50 million euros to speed up the development of 5G mobile technology, plans to launch a mature by 2020. The development of 4G technology is now in full swing, in February 2013, the EU announced that it will allocate 50 million euros to speed up the development of 5G mobile technology, standard. Samsung said its 5G network has successfully reached 1Gbps in the 28 GHz band, compared to 75Mbps for the current fourth-generation Long Term Evolution (4GLTE) service. April 8, 2013 “Boao” Forum for Asia, China Mobile strategic decision-making advisory committee director Wang said that from a global perspective, 4G rapid development has become a reality, 5G research is also rapidly expanding and mature.