George Lampropoulos

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The integration of existing cellular systems with new wireless access technologies, such as wireless LANs, has attracted considerable attention during the past few years. The challenges to be addressed include authentication, security, QoS support and mobility management. Efficient mobility management, and especially handover management, is considered as(More)
he mobile Internet technology and its related applications and services have progressed greatly in the past few years, and now we see many tiny terminals with integrated multifunction chips in the market. However, at the same time we observe a kind of separation between the technology development and the common Internet applications customers usually use.(More)
The next generation mobile system is expected to support the continuous increase of users requirements. Through the high flow rates of these networks, new applications constraints are more complex and may be change dynamically and rapidly for wireless systems. The service heterogeneity provided by these applications has a great influence on system(More)
uring the past few years there has been a race among cellular operators to upgrade their infrastructure toward Third Generation (3G) systems (mainly, the Universal Mobile Telecommunication System — UMTS). At the same time, a recent phenomenon is the rising popularity of wireless LANs (WLANs), especially with the wide use of 802.11-based networks. WLANs(More)