Vehicular applications, such as traffic safety applications used to increase the road safety and traffic efficiency applications used to decrease the traffic jams are mainly supported using VANETs (Vehicular Ad-hoc Networks). An important VANET feature is beaconing. This paper uses simulation experiments to analyze how the reception probability of beacons can be increased by optimizing the Cont...

Quality of Service (QoS) is the ability to guarantee a certain level of performance to a data flow ie., guaranteeing required bit rate, delay, etc. IEEE 802.11 a/b/g networks do not provide QoS differentiation among multimedia traffic. QoS provisioning is one of the essential features in IEEE 802.11e. It uses Enhanced Distributed Channel Access (EDCA) which is a contention-based channel access ...

In carrier-sense-multiple-access-based distributed wireless networks, the legacy mechanism of arbitrating the access attempts of multiple broadcast users (using a fixed-size temporal contention window consisting of multiple contention slots having uniform selection probability) has been well understood to be inefficient in avoiding collisions, especially when the network is large. Recently, it ...

This paper deals with the problem of best effort traffic delivery in 802.11e contention-based networks. Differently from most previous paper which focus on the support of quality of service (QoS) requirements, we study the tuning of the access parameters for the best effort traffic. The contribution of this paper is threefold. First, we discuss the coexistence between legacy DCF and EDCA statio...

Recently designed cross-layer contention based synchronous MAC protocols like the PRMAC protocol, for wireless sensor networks (WSNs) enable a node to schedule multi-hop transmission of multiple data packets in a cycle. However, these systems accommodate both the request-to-send data process and the confirmation-to-send data process in the same data transmission scheduling window (i.e. data win...

We derive a closed-form expression for the message collision probability in the IEEE 802.3ah Ethernet Passive Optical Network (EPON) registration scheme. The expression obtained, although based on an approximation, shows a good match with simulation results. We use the results of our analysis to compute the size of the most efficient contention window and the most efficient number of nodes serv...