With the development of communication network architecture which has been close the limit of Shannon Theory, Rely on changing the modulation or upgrading technology to improve network capacity and speed of approach is moving towards the end, and the future solutions is only depending on reducing the physical size of the base station to get
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At present, among china’s three big operators, China Mobile and China Unicom, charged with the GSM network construction and maintenance, and the main profits come from GSM network. But the performance evaluation in cellular communication system like GSM, interrupting the ongoing call is more offensive than blocking new call. So when the user from a
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At present, among china’s three big operators, China Mobile and China Unicom, charged with the GSM network construction and maintenance, and the main profits come from GSM network. But the performance evaluation in cellular communication system like GSM, interrupting the ongoing call is more offensive than blocking new call. So when the user from a
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With the development of the High-speed Railway all over China and the world, the research of wireless propagation theory in the High-speed Railway is more and more important. As the Railway special digital mobile communication system, GSM-R supplies wireless communication and control information transmission for the the train. The reliability of the GSM-R network is
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Recently, the high speed railway is developing rapidly. The reliability and validity of the mobile communication system is very strict under high speed condition. The research on the mobile communication system of high speed railway has become a hot area these years. Usually, the research method combines the theory analysis, performance measurement and simulation.At present,
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With the rapid growth of wireless communications and the emerging demands for high quality of wireless video communications, how to provide proper video services no matter where or when becomes a hot research topic nowadays. However, the dynamics and heterogeneity of wireless networks, high error rate, the unpredictability of fluctuation in channel bandwidth, and the
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With the development of the high-speed railway, how to meet the requirements of communication to the passengers, enjoying good voice and broadband data service, it has an important significance on the development of the high-speed railway. Because of the flat structure, and the high rate of data services, low delay etc, these advantages make LTE
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In order to adapt to different communication environments and to meet the user’s broadband and intelligent demands, various wireless access technologies have been developed. There exists complementarity among different wireless networks, so an appropriate integration of these kinds of networks will enable mobile users to suit their needs by accessing the most effective access networks.
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In order to resolve the hard handover problems in the GSM-R network, the performance assess technology and test methods for existing handover technology are studied. A handover performance evaluation method based on signal level is given to evaluate the overall performance for handover algorithm. Moreover, a novel handover method based on double antenna technology is
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Because of the impact of economic pattern, the developments of GSM network are unbalanced in China. In the developed coastal area, the mobile network construction has transited to optimize GSM network and configure it from the users’view. The key job of GSM network optimization in the eastern area is the smooth transition to 3G/4G. In
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