欧洲3G动态

西班牙政府在2000年3月发出4个UMTS许可证，拍卖所得为477亿美元。西班牙市场上现有的大型运营商是最大的赢家．西班牙国内市场的老大哥Telef δ nica，由意大利电信拥有的西班牙第二大固网运营商Retevision的移动部门Amena以及由英国电信和Vodafone Air Touch控制的第二大移动运营商Airtel各获得一张许可证。第四张由包括Orange组成的Sonera／Vivendi “Xfera“联盟得到。

A Novel Vertical Handoff Algorithm with Dynamic Weights in Wireless Heterogeneous Networks

In order to enhance the quality of vertical handoff in an overlay wireless network, multiple attributes are taken into account when optimizing the vertical handoff decision including user-based and network-based QoS factors. In this paper, we develop a novel vertical handoff algorithm in an integrated 3G cellular and Wireless LAN networks. The proposed algorithm can adjust the weight of each QoS attribute dynamically as the networks change, trace the network condition and choose the optimal access point at transient regions. Simulation results show that this algorithm is able to provide accurate handoff decision, resulting in small unnecessary handoff numbers, good performance of throughput and handoff delay in heterogeneous environments.

高校大学生关爱管理工作探究

社会发展迅速、高科技的运用给高校的管理带来了挑战和机遇。在对当代大学生的管理中,不仅要做到以人为本,还要加强与家长的联系,才能共同培养大学生成长成才。如今,高校可以借助科学、快捷的方式让学生、家长、学校这三者之间的关系更加紧密,使管理更加人性化、科学化、长久化地做到有效关爱,从而督促大学生自我管理、自我教育,更好地适应社会的发展需要。