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In wireless Ad hoc networks, using multi-channel technique on MAC layer to increase the network capacity is a promising technology. By extending the RTS/CTS mechanism of IEEE802.11 standard, we propose a busy tone-based multi-channel MAC protocol, which can significantly improve the network throughput by using busy tone to distribute the multiple channels(More)
Described in the specifications of WAVE (Wireless Access in Vehicular Environments) standards, broadcast is the main traffic in vehicular networks when all vehicles monitor the control channel. In this paper, we show a simple Markov model to analyze the saturation throughput of control channel broadcast, our analysis reveals that existing IEEE 802.11p(More)
We present a complete and practical analytical model for the IEEE 802.11-based multi-hop wireless networks. The features of our model are that it first takes into account the realistic problems both from the physical and MAC (Media Access Control) layers in multi-hop wireless networks, including packet collisions, neighboring interference, hidden node(More)
This paper proposes a cross-layer adaptive cooperative MAC protocol (CAC-MAC) based on IEEE 802.11 DCF, which forms a complete Application-MAC-PHY layer framework. The main feature of CAC-MAC protocol is an adaptive selection of data transmission scheme according to packet length and instantaneous wireless channel conditions. Simulation results show that(More)
Recently, partitional clustering approaches based on Evolutionary Algorithms (EAs) have shown promising in solving the data clustering problems. However, with the nearest prototype (NP) rule as the method for decoding, most of them are only suitable for clustering datasets with convex (e.g. hyperspherical) clusters. In this paper, we propose an automatic(More)
For analysis of the IEEE 802.11 distributed coordination function (DCF) under nonsaturated condition, one of the key assumptions commonly accepted is that given the offered load, the queue utilizations of contending nodes are the same for all transmitted packets. In practice, however, this assumption is not valid due to coupled queues effect. In this paper,(More)
The collision probability experienced by each node on a link plays an important role in estimating the available bandwidth at the Medium Access Control (MAC) layer. The available bandwidth is a crucial information to the decision made by Admission Control for QoS support in wireless networks. Most of existing Admission Control schemes proposed for wireless(More)
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