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A mobile adhoc network is an independent system of mobile stations associated by wireless link to form a system. This system can be modeled in the form of an uninformed graph. Adhoc networks are peer to peer, multihope networks were data packets are transmitted to a source to destination through intermediate nodes (which serve as router). The infrastructure is not the main issue to setup MANET and...
Communications in highly mobile vehicular networks are challenging and have gained great attention in recent decades. One promising candidate is the IEEE 1609/802.11(p) network standard suite [1][2][3][4][5][6], which is evolved from the commodity 802.11 technology and revised for vehicular environments. Over the non-safety applications in vehicle networks, group communications are expected to enhance...
The main deficiency of standard TCP and all existing variations in ad hoc mobile network arises in its inability to classify packet losses. Conventional TCP diagnoses all losses due to congestion since non-congestion losses are rare and ignorable in wired network. However, these losses are generated frequently in MANET due to signal attenuation, interference and node's mobility. In order to prevent...
A voice conversation is predominantly known as a synchronous, delay intolerant form of communication. To complement voice conversations, voice messaging is a form of asynchronous communication used when the called party is unavailable; a delay in message delivery is naturally expected and tolerated. To this extent, a Delay Tolerant Network can be utilized as the underlying data transport mechanism...
Based on the analysis of the existing utility-based forwarding mechanisms, for the inefficient forwarding of history encounter time based forwarding mechanism in the initial phase of the node movement, a Random and Encounter Time Based algorithm named RET is proposed in this paper. RET divides the nodes moving into two phases-random forwarding phase (initial phase) and utility-based forwarding phase...
Publish/Subscribe system is an asynchronous and multi-point communication system, which decouples communication space from communication time and control flow completely. It adapts well to highly dynamic network environments and data-centric networks. This paper presents an Opportunistic Networks based Message Publish/Subscribe Scheme (ONMPSS), which can calculate the number of subscription requests...
We analyze the dynamics of two mobility datasets in DTN (Delay Tolerant Network), collected from different sources, including one university campus WLAN and two conferences WLANs. We find that the temporal network density of DTN changes with time and approximate varies periodically. We study how the cyclic temporal network density affects information diffusion. The results show that average reachability...
The spacial distribution of nodes in the Opportunistic networks is uneven in the real scenarios. There are some landmarks with high node density distributed in the network area. Based on the uneven distribution character of nodes in the Opportunistic Networks, a landmark aware content searching scheme (LACS) is proposed. The scheme proposed here is composed of two sub-schemes, latent spray scheme...
Message Ferrying (MF) is a recently proposed scheme to restore a Mobile Ad Hoc Network (MANET) from partitioning. Despite of the effectiveness in partition restoration, it sometimes suffers from long delay caused by the poor design of ferry route. The Message Ferry Route (MFR) problem has earlier been studied to minimize this drawback of MF schemes. In this paper, we argue that a dynamic way of determining...
Most traditional MAC protocols proposed for wireless networks assume static Network Units (shorted as NUs), which usually lead to performance degradation in mobile scenarios. In this paper, a novel hybrid MAC protocol, called MA-MAC, was presented for multi-hop mobile Tactical Data Link networks based upon the mobile characteristics of NUs. The basic point of MA-MAC is that the transmit mode of each...
The limitation on the battery lifetime has been a critical issue for the advancement of mobile computing. Different types of power-saving techniques have been proposed in various fields. In order to provide feasible energy-conserving mechanisms for the mobile subscriber stations (MSSs), three power-saving types have been proposed for the IEEE 802.16e broadband wireless networks. However, these power-saving...
In this paper, we propose a new routing protocol for ad hoc wireless networks, which is based on DSR (Dynamic Source Routing) on-demand routing protocol. Congestion is main reason for packet loss in mobile ad hoc networks. If the workload is distributed among the nodes in the system based on the delay of the paths, the average execution time can be minimized and the lifetime of the nodes can be maximized...
A mobile ad-hoc network is a set of mobile nodes that communicate with each other through the airwave. These networks have a high flexibility and have no central infrastructure or supervisor. In this type of networks, the topology is in change always, and the important problem in them is finding the path between source and destination. In this paper, we introduce a multi path hybrid routing algorithm...
As mobile wireless networks increase in popularity and pervasiveness, seamless mobility is an important paradigm for uninterrupted services in ubiquitous network environments. In this paper, we propose a zero packet loss handoff mechanism for real-time streaming services, which is based on the SIP protocol cooperated with mobile agent, multicast, and buffering technique to overcome the affects of...
The increasing ubiquity of mobile embedded systems has been matched by the evolution of a variety of wireless network standards and technologies. The major constraints of wireless embedded systems are limitations of communication bandwidth, processing capabilities, and battery power. Remote wireless embedded systems often act as sensors, which provide data to a certain community. The exchange of data...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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