Assignment help


在21世纪的开始,无线移动市场正在见证前所未有的增长了一个信息爆炸和一场技术革命。在射频领域,这一趋势从窄带到宽带的家庭标准根据不同的应用需求。许多支持技术包括宽带目前访问、软件定义无线电,智能天线和数字处理设备大大提高3 g系统的频谱效率。在移动网络领域,这一趋势从传统电路交换系统分组交换的可编程网络整合语音和包服务,并最终进化向全ip网络。此外,伴随着无线移动定位技术、无线移动互联网将改变可以给消费者提供的服务在正确的地点和正确的时间。无线移动通信不仅可以补充完善钢丝绳网络;它也可能成为一个严重的竞争对手。我们回顾历史的无线移动通信,检查当前的标准和技术的进展,并讨论可能的趋势无线移动解决方案



At the start of the 21st century, the wireless mobile markets are witnessing unprecedented growth fueled by an information explosion and a technology revolution. In the radio frequency arena, the trend is to move from narrowband to wideband with a family of standards tailored to a variety of application needs. Many enabling technologies including wideband code-division multiple access, software-defined radio, intelligent antennas, and digital processing devices are greatly improving the spectral efficiency of third-generation systems. In the mobile network area, the trend is to move from traditional circuit-switched systems to packet-switched programmable networks that integrate both voice and packet services, and eventually evolve toward an all-IP network. Furthermore, accompanied by wireless mobile location technology, wireless mobile Internet is expected to revolutionize the services that can be provided to consumers in the right place and at the right time. Wireless mobile communications may not only complement the well established wire line network; it may also become a serious competitor in years to come. We review the history of the wireless mobile communications, examine the current progress in standards and technologies, and discuss possible trends for wireless mobile solutions

The research method is compared to other methods of empirical mobile service research. On several occasions the value of the defined research method is significant, providing accurate logs of service usage along with location and time stamps. The combination of subjective survey and objective usage data provides new angles in empirical research. The research conducted claims that the handset-based data collection method and associated analysis approaches provide valuable information for the stakeholders of the mobile industry. Results can be used in developing and launching new mobile services. Academic domains for the application of the research method include measurement of service usage, contextual end-user research, modeling of service adoption, and analysis of moderating factors of usage.