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Cooperative communication (CC) is a technique that exploits spatial diversity allowing multiple nodes to cooperatively relay signals to the receiver so that it can combine the received signals to obtain the original message. CC can be combined with topology control to increase connectivity at the cost of a small increase in energy consumption. This work focuses on exploring CC to improve the connectivity...
Access networks based on cooper cables are costly to build and maintain. For this reason, last-mile access networks based on wireless technologies are gaining considerable attention. Among the wireless technologies being employed, the IEEE802.11 is common place. In such scenarios it is important to have well defined mechanisms to better evaluate traffic characteristics and overall system performance...
The main contribution of this article is to propose a collaborative and distributed cache mechanism tailored for ad hoc networks. Each node's cache is partitioned into a shared area and a private area. The proposed collaborative cache is formed by each node's shared area, which is used to store contents relevant to the group, while the private area is used to store information relevant to its owner...
The main contribution of this work is to propose a distributed on-demand routing and wavelength assignment algorithm for WDM networks. The proposed algorithm, termed WDM-DSR, is capable to select routes and establish light-paths via message exchanges without imposing a major overhead on the network. Also, we show that the proposed scheme can be used to balance the load in a WDM network. The simulation...
One of the major challenges in ad hoc networks is to ensure nodal collaboration. Nevertheless, collaboration may lead to undesired results when nodes can exploit their siblings for their own benefits. Until recently, the research community focused on ensuring nodal cooperation at the network layer. In this work we focus on node behavior at the medium access control (MAC) layer. more specifically,...
The performance of WDM networks are usually analyzed through the blocking probability of a pool of requests. It is argued that alternative routes can have a significant impact on the blocking probability of a WDM network. In this work, we analyze the impact of alternative routes in mesh and ring topologies. The results show that, contrary to what would be expected, having alternative routes may have...
Channel allocation has been considered a NP-complete problem, and involves a very important issue for the adequate dimensioning of wireless communication networks. One of the possibilities for its solution involves the utilization of heuristics, able to produce near optimal solutions in an acceptable computational time. In this paper, a hybrid of GRASP (greedy randomized adaptive search procedure)...
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