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In heterogeneous radio network environments, the incorporation of dynamic adaptation capabilities in the protocol stack of mobile devices is an important challenge. In this direction, an appropriate model of the network decision-making process for mobile device adaptation is presented. Two main adaptation alternatives are assumed: (1) handover and (2) protocol reconfiguration. We consider two classes...
In this paper, we consider a rural infostation system where power and bandwidth limited infostations are deployed in a large network area with sparsely populated mobile nodes. Direct transmission services are provided to each mobile node, whereas message dissemination services facilitated by relaying are provided to a subgroup of mobile nodes. We investigate radio resource allocation at infostations,...
Consider a wireless network of two tiers with different priorities: a primary tier and a secondary tier, which is an emerging network scenario with the advancement of cognitive radio technologies. The primary tier is constructed over static nodes of density n, which are randomly distributed and have an absolute priority to access the spectrum. The secondary tier contains mobile nodes of density m...
In wireless networks, most of the TCP variants interpret the occurrence of losses is only due to congestion. This is because of their inability to distinguish between wireless link losses and congestion losses. Subsequently, the flow rate of the TCP segments is decreased, which reduces the throughput and good put. Hence, to improve the performance of TCP in wireless networks, an efficient scheme called...
In this work, we present an analysis of the gain achieved in terms of efficiency with PUSH-based epidemic diffusion of messages, when maintaining and exchanging information about the infection status. Different policies for the exchange of partial status information are compared, with the aim of optimizing bandwidth usage. We analyze the effects of adding a copy-count mechanism to the maintenance...
We consider a time-slotted multipacket reception channel, shared by a finite number of mobile users who transmit to a common base station. Each user is allocated a fixed data rate, which may be imposed by the base station or self-determined. For sustaining the required rate over time, each user may adjust a single parameter which determines the individual transmission probability in a given slot....
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
In this paper, we propose a cross-layer optimization approach that exploits retransmission diversity in wireless CDMA communications. Conventionally, data packets that are not correctly detected are usually dropped. These dropped packets can be used to help data packet detection. By exploiting all the retransmitted packets, data packets can be correctly detected with higher probability. The proposed...
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