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This paper is not a survey related to generic wireless sensor networks (WSNs), which have been largely treated in a number of survey papers addressing more focused issues; rather, it specifically addresses architectural aspects related to WSNs in some way connected with a satellite link, a topic that presents challenging interworking aspects. The main(More)
Cognitive radio technology aims at the ef cient utilization of the limited radio resources and the improvement of exibility of spectrum usage in wireless networks. The main idea of this technology is the development of intelligent networks where the unlicensed secondary users may coexist with the licensed primary users, always limited by the obligation not(More)
In this paper, we focus on proactive radio resource management schemes that retain the quality of the individual connections by pre-reserving the needed resources in a cellular network. We propose a new scheme, which improves older proactive solutions. Typically, in such solutions an improvement in call dropping probability negatively impacts new call(More)
—Spectrum leasing in cognitive radio networks has recently started to draw the attention of the researchers. According to this concept, the primary users own specific spectral resources and they decide how to lease them to the secondary users so as to optimize their performance. In this paper, we consider an overlay cognitive radio network where the(More)