计算机专业 外文翻译 外文文献 英文文献 2G的潜力.doc

译文标题 2G的潜力 原文标题 Untapped Capabilities of 2g 作 者 Stephen 译 名 斯蒂芬 原文出处 International Journal of Internet and Enterprise Management 译文： 2G的潜力 斯蒂芬 附件（外文原文） Untapped Capabilities of 2g Stephen Abstract: The advent of 3G wireless technologies is obviously relegating the 2G network, gradually pushing them into oblivion. The shortcomings of 2G are the platform that brought about the development of 3G but this does not justify it to be scrapped. This paper will analyze these shortcomings and try to bring out the potentials of the 2G system which can still be garnered. This analysis will be based on the technology used by the system, marketing and the consumers. Keywords: Second generation for mobile communications, Third generation for mobile communications, General packet radio service, Global systems for mobile communication, Universal mobile telecommunication system, Wideband code division multiple access 1. Introduction 2G technology has being said to have reached its capacity limit because of the lack of available channels i.e. the channels are totally used up (congestion). This is especially said in the urban areas which are traffic hotspots, due to the population of people subscribed to the service. During peak hours the operators may soon be unable to provide service for everybody in these traffic hot spots. But the lack of capacity in 2G systems alone does not make the building of 3G systems necessary. Current phone usage is still mostly voice, and this traffic could be handled quite easily by just adding extra frequency allocations to 2G networks (e.g. from the UMTS spectrum[5Mhz]). Breaking it down, one GSM frequency carrier takes 200-kHz bandwidth and can accommodate eight traffic channels. Thus, one WCDMA 5-MHz frequency carrier could accommodate 25 GSM frequency carriers, translating into 200 GSM traffic channels. In practice, the numb