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MAC Layer Outage Probability of Bounded Ad Hoc Networks

Kaynia M., Fabbri F., Øien G. E., Verdone R.

Advances in Electronics and Telecommunications

2011

Vol. 2, no. 4

39--46

We consider a bounded square-shaped ad hoc network scenario, within which packet arrivals are distributed randomly in space and time according to a 3-dimensional Poisson Point Process. Each packet is transmitted over a single hop to its destination, located a fixed distance away. Within this context, the outage probability of the ALOHA and CSMA protocols is derived, and we evaluate the impact of edge effects in space on the performance of MAC protocols. Our analytical expressions are verified with Monte Carlo simulations. The behavior of the network is evaluated as the system parameters, such as the node density, the physical size of the network, and the distance between each transmitter and its receiver, vary. Furthermore, the obtained results are compared to those of unbounded networks, showing that edge effects reduce the average outage probability across the network significantly, due to the lower level of interference suffered by boundary nodes.

Sociability Based Routing for Environmental Opportunistic Networks

Verdone R., Fabbri F.

Advances in Electronics and Telecommunications

2010

Vol. 1, no. 1

98--103

Network opportunism in wireless systems aims at jointly exploiting the resources of separate networks. So far, small emphasis to this paradigm has been given in the literature related to Wireless Sensor Networks (WSNs). This paper first describes a vision on the evolution of WSNs towards the application of this concept. Then, a way to allow exchange of information related to the available resources among networks, is formalised. Finally, the concept is exemplified by considering a specific type of application scenario and resource sharing approach: a vehicular network where pairs of mobile nodes exchange packets by exploiting a store-carry-forward mechanism. This scenario allows the introduction of the concept of Sociability Based Routing.