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Delay Tolerant Networks (DTN) are a class of networks that lack continuous connectivity between nodes due to limited wireless radio coverage, widely scattered mobile nodes, constrained energy resources, high levels of interference or due to some other similar channel impairment. Examples of such networks are those operating in mobile networks or extreme terrestrial environments, or simply as planned...
The effort dedicated to the ultimate goal of designing an architectural framework for tactical mobile ad hoc networks (MANETs) has long been hindered by the excessive control overhead of routing protocols to maintain a full view of the network topology. This paper explores the viability of adopting network coding as a means of improving reliable data delivery while lowering control overhead in large...
Routing is one of the most challenging open problems in Vehicular Ad hoc NETworks (VANETs) because of the short-lived wireless connectivity environment. Store-carry-and-forward approach using buses on regular routes is considered as one of the most promising emerging routing policy that can significantly improve delivery performance and reliability in VANETs. While none of existing solutions considers...
Network coding may be used to improve resource efficiency and transmission reliability in the network. In this paper, we explore linear network coding for data forwarding in delay tolerant networks, which enable data transmission with intermittent connectivity. Specifically, we focus on vehicular ad hoc networks with scheduled routes such as bus systems. Traditional forwarding schemes may be inefficient...
Routing in delay tolerant networks (DTNs) in which most of the nodes are mobile and intermittently connected is a challenging problem because of unpredictable node movements and lack of knowledge of future node connections. To ensure reliability against failures and increase the success rate of delivery, erasure coding technique is used to route messages in DTNs. In this paper, we study how the cost...
A Mobile Ad hoc NETwork (MANET) is composed of a set of wireless mobile devices that are able to communicate with each other in a peer-to-peer mode. In recent years video streaming over MANETs has drawn significant attention due to the popularity of high-speed IEEE 802.11 standard series. However, it is still a challenging task for channel variation and bandwidth limitation and fluctuation. In this...
Vehicular networks (VANET) attract a lot of attention in the research world. Novel vehicular applications need suitable communication mechanisms to extend in-vehicle capabilities and, be aware about surrounding events. However, these networks present some characteristics, such as high mobility or specific topologies. These properties affect the performances of applications and more effort should be...
Multicast application is one of key value-add field to cellular mobile network. Cooperative relay multicast network can be applied inside the cell of cellular system to improve performance of multicast sessions by adding relay nodes. This paper focuses on the optimization to relay nodes tree based on ant colony optimization (ACO). Besides cost and delay, power control is important to wireless relay...
Mobile nodes in some challenging network scenarios suffer from intermittent connectivity and frequent partitions e.g. battlefield and disaster recovery scenarios. Disruption tolerant network (DTN) technologies are designed to enable nodes in such environments to communicate with one another. Recently, network coding schemes for DTN has been proposed. However, these schemes work well only in scenarios...
Providing efficient networking services in MANETs is very challenging in presence of mobility, unpredictable radio channel and interference: a significant number of packets can be corrupted and/or lost. To increase reliability, various measures have been proposed. A popular approach is to use multiple paths and transmit identical copies of the packet on each path (i.e., path redundancy). A more efficient...
Network coding is a new method by which a multicast network can achieve the network capacity determined by the max-flow and min-cut theorem. This paper shows the mutual exchange of independent information between two nodes in a wireless network which can be efficiently combined with network coding and broadcast property offered by wireless medium. It introduces COPE, an opportunistic approach to network...
A rapidly growing number of carriers offer wireless video services to their customers, taking advantage of high quality video codecs implemented in dedicated hardware of selected mobile devices. In this paper we introduce a video conferencing software, which seamlessly integrates mobile with stationary users in a provider and device independent fashion. Innovations of this work are twofold. At first...
Most routing protocols in disruption tolerant networks (DTN) use redundant transmissions to explore the diversities in routing paths in order to reduce data transmission delay. However, mobile nodes in DTN usually have limited energy and may prefer fewer transmissions for longer lifetime. Hence, it is vital to carefully balance the tradeoff between data transmission delay and the amount of transmissions...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
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