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This research conducts a systematic study of human-initiated cascading failures in critical inter-dependent societal infrastructures. The focus is on three closely coupled systems: (i) cellular and mesh networks, (ii) transportation networks and (iii) social phone call networks. We analyze cascades that occur in inter-dependent infrastructures due to behavioral adaptations in response to a crisis...
Advances in indoor short-range wireless communication technology and the proliferation of lightweight handheld devices with built-in high-speed radio access have made wireless LAN deployments increasingly common and the indoor wireless LANs are emerging as an ideal solution for providing high speed connectivity for in-building communications operating in 2 GHz frequency band. The proliferation of...
A combined base station association and power control problem is studied for the uplink of multichannel multicell cellular networks, in which each channel is used by exactly one cell (i.e., base station). A distributed association and power update algorithm is proposed and shown to converge to a Nash equilibrium of a noncooperative game. We consider network models with discrete mobiles (yielding an...
83% of the world population does not have access to Internet. Therefore there is a need for a simple and affordable interaction technology that can enable easy content creation and dissemination for this population. In this paper, we present the design, development and usage pattern of a VoiKiosk system that provides a voice-based kiosk solution for people in rural areas. This system is accessible...
We study in this paper the question of determining locations of base stations (BSs) that may belong to the same or to competing service providers, taking into account the impact of these decisions on the behavior of intelligent mobile terminals who can connect to the base station that offers the best utility. We first study the SINR association-game: we determine the cells corresponding to each base...
The demand for the wireless Internet requiring broadband is expected to increase in a dramatic way due to popularity of tri player applications including voice, video, and data transmission. The existing wireless technologies UMTS, WiFi, WiMax, may not satisfy the customer requirements, for many reasons including availability, coverage, cost and most importantly mobility. Each technologies has it...
We consider the problem of several users transmitting packets to a base station, and study an optimal scheduling formulation involving three communication layers, namely, the medium access control, link, and physical layers. We assume Markov models for the packet arrival processes and the channel gain processes. Perfect channel state information is assumed to be available at the transmitter and the...
This century is experiencing an unprecedented growth in the number of mobile wireless users, applications, and wireless network access technologies. The future technology will provide communications and computing, where the users have network access, anytime, anywhere, and these applications shall be location-sensitive. To realize this vision, the network connectivity of private networks is required...
Caching frequently accessed data items on the client side is an effective technique to improve the system performance in mobile environment. Due to cache size limitations, the choice of cache replacement techniques used to find a suitable subset of items for eviction from cache becomes important. In this paper, we propose a new cache replacement policy, predicted region based replacement policy (PRRP)...
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