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Delay Tolerant Network (DTN) is a kind of networks that have no fixed path between nodes due to lack of continuous network connectivity. To achieve successful communication and to improve performance in DTN is always a challenge work. Most existing works are based on designing high efficient routing protocols and have not emphasized the MAC layer as well as new technologies available in the Physical...
We present a discussion and study of the RTS/CTS channel clearing mechanism used in the 802.11 DCF and propose a possible improvement. We focus on why the current mechanism is only a single hop process, what disadvantages this presents and what advantages a multihop version of RTS/CTS would bring. We describe why the proposed multihop approach, called multihop clear channel assessment (MCCA), brings...
Mobile adhoc network(MANET) is a ??on the fly?? network of mobile nodes. Packets are routed through mobile nodes instead of any fixed base station. (AODV) is most adopted routing protocol in MANET where a path is established when a node wants to communicate with another node. The period over which the communication proceeds through this path is known as a Session. When the mobility in the network...
In this paper, we jointly address the scheduling problem such as rate control, medium access control (MAC) and routing for cooperative vehicular ad-hoc networks (VANETs) in the framework of cross-layer design. Compared to its counterpart in a wired network where link capacities are assumed to be fixed, congestion control in a multi-hop cooperative VANETs is much more complex and requires joint optimization...
In this demo, we showcase DiffQ - a congestion control protocol inspired by theoretical cross-layer optimization approaches. DiffQ can support congestion control for network flows that use either single-path or opportunistic multi-path routing. Our demo will focus on the performance in single-path routing environments, where contemporary end-point congestion control algorithms like TCP face severe...
To meet the needs of QoS requirement of multimedia traffic in wireless networks, IEEE 802.11e protocol has been proposed as an upcoming standard. The medium access control (MAC) layer of 802.11e has provided QoS support through priority scheduling for different types of traffic. However, the 802.11e QoS mechanism has an impact on the higher layers i.e. network layer and create new issues that need...
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