A Bandwidth Sharing Approach to Improve Licensed Spectrum Utilization
The spectrum of deployed wireless cellular communication systems is found to be underutilized, even though licensed spectrum is at a premium. To efficiently utilize the bandwidth left unused in a cellular system, the primary system (PRI), the authors propose an overlaid ad hoc secondary network (ASN) architecture, with the ASN operating over the resources left unutilized by the PRI. Their basic design principle is that the ASN operates in a nonintrusive manner and does not interact with the PRI.
Panagiotis Papadimitratos, Srivatsan Sankaranarayanan, and Amitabh Mishra, Virginia Tech
Mobility Management in All-IP Mobile Network: End-to-End Intelligence or Network Intelligence?
The mobile telecommunication network is morphing into an All-IP mobile network with diversified radio access systems. The All-IP mobile network should be established by converging the mobile telecommunication network and the fixed Internet. The authors open a debate on whether mobility management should be implemented as end-to-end intelligence or network intelligence.
Masami Yabusaki, Takatoshi Okagawa, and Kazuo Imai, NTT DoCoMo
Extensible Authentication Protocol (EAP) and IEEE 802.1x: Tutorial and Empirical Experience
The authors present the technical details of the Extensible Authentication Protocol (EAP) and IEEE 802.1x by using WIRE1x, an open-source implementation of IEEE 802.1x client (supplicant) and various EAP-based authentication mechanisms. By using a real implementation, 802.1x and EAP should be easily understood.
Jyh-Cheng Chen and Yu-Ping Wang, National Tsing Hua University
Integrated Satellite-HAP Systems
Thus far, high-altitude platform (HAP)-based systems have been mainly conceived as an alternative to satellites for complementing the terrestrial network. The authors aim to show that HAP should no longer be seen as a competitor technology by investors of satellites, but as a key element for an efficient hybrid terrestrial-satellite communication system. Two integrated HAP-satellite scenarios are presented, in which the HAP is used to overcome some of the shortcomings of satellite-based communications. Moreover, it is shown that the integration of HAPs with satellite systems can be used to provide more efficient fleet-management and traffic-control services and more powerful data-relay systems.
Ernestina Cianca and Ramjee Prasad, Aalborg University; Mauro De Sanctis, Aldo De Luise, Mirko Antonini, Daniele Teotino, and Marina Ruggieri, University of Rome "Tor Vergata"
