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Cellular networks are usually modeled by the point process theory and stochastic geometry with mobile users either scattered randomly or deterministically set. These models are used widely in a 2-D space but are not suitable for dense urban environment in which a large number of small cells are distributed to satisfy the rapid increase in mobile subscribers as well as the traffic demand. In this paper,...
The introduction of femtocells brings more interference to cellular system, setting threshold to femtocell users' transmit power can control it effectively. To control the interference from femtocell users to macro base station and guarantee the QOS and maximize system capacity, this paper develops the uplink power control algorithm of femtocell system based on threshold and water- filling theorem...
Mobility model is important for the performance analysis of wireless networks. The paper presents an angle mobility model. Based on the model, the characters of the direction angle for terminal mobility are analyzed and a calculation method for handoff rate is proposed. The theoretical closed-formula is derived for handoff rate in the condition that users' moving direction is unchanging in the fixed...
this study selected English and non-English major college students as the survey object. Literature method, survey research and interview method have been used to investigate college major differences in need of mobile phone learning. Results show that: attitude of mobile phone learning, expectations, preferences in the form of resources and content are different with major.
Modern society need a lifelong learning, people need to continue to "recharge" to update their knowledge structure and the capability to keep up with the times. With fast pace of modern life and work pressure, it is difficult to have a full time to learn the knowledge, such as school learning, career training. Mobile learning offers the possibility to solve this problem, learners can be...
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