Performance analysis in 3G/ad hoc integrated network

An analytical approach to evaluate the performance of the 3G/ad hoc integrated network is presented. A channel model capturing both path loss and shadowing is applied to the analysis so as to characterize power falloff vs. distance. The 3G/ad hoc integrated network scenario model is introduced briefly. Based on this model, several performances of the 3G/ ad hoc integrated network in terms of outage probability, call dropping probability and new call blocking probability are evaluated. The corresponding performance formulae are deduced in accordance with the analytical models. Meanwhile, the formula of the 3G/ad hoc integrated network capacity is deduced on the basis of the formula of the outage probability. It is observed from extensive simulation and numerical analysis that the 3G/ad hoc integrated network remarkably outperforms the 3G network with regards to the network performance. This derived evaluation approach can be applied into planning and optimization of the 3G/ad hoc network.

3G网络和无线局域网混合认证服务机制

随着无线局域网技术的飞速发展和广泛应用,无线网络环境下的安全问题越来越受到关注。无线信号容易遭到窃听、拦截及其他通信干扰,因此,需要一定的安全机制实现数据保密、身份认证以及数据完整性保护。文章在分析第3代移动通信系统与无线局域网络的相关身份认证机制及相关安全性能的基础上,针对两者认证机制的优缺点提出了一种3 G网络和无线局域网的混合认证服务机制,并给出了该机制的详细设计及简要分析。

无线通信技术在电力通信中的应用

当今全球无线通信领域热点不断出现,如何利用包括3 G、W iMAX、MMDS、LMDS、WLAN等新技术,构建坚强可靠的电力通信网,已成为电力通信一个课题。文章结合电力通信的特点,通过对无线新技术特性的分析,展望了其在电力通信系统的应用前景,目的是将电力通信专网建设成高带宽、IP化、具有强QoS保证的信息通信网络平台。