Showing papers by "Nicola Bui published in 2006"

On the exploitation of user aggregation strategies in heterogeneous wireless networks

Abstract: In this paper we discuss the exploitation of aggregated mobility patterns and physical proximity of nodes in a so-called ambient network, i.e., a wireless network with heterogeneous nodes and access techniques. We advocate to use the knowledge about node movements and geographical positions to create routing groups of adjacent nodes, which might be beneficial in order to decrease signaling overhead and increase transmission efficiency. Basically, routing groups (RGs) consist of aggregated logical structures which are built and maintained at the application layer. Their aim is to decrease the signaling overhead between group of nodes and access points and, at the same time, to improve connectivity by exploiting technology diversity and relaying techniques. On this matter, we describe a validation through simulation of a previously developed analytical work which is useful to evaluate the effectiveness of RG structures. Finally, we show the validity of the RG approach in terms of throughput and connectivity performance.

A group mobility model based on nodes' attraction for next generation wireless networks

Abstract: This paper proposes a novel mobility model aiming at capturing the grouped mobility behavior of the users of a wireless network. The description and possibly the exploitation of similar mobility patterns of users, moving in a correlated fashion and originating groups, is an important challenge for future generation networks. In fact, a correct understanding of this phenomenon can be applied in order to gain cross-layer knowledge, therefore improving the management of the network by exploiting the presence of mobile groups.