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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...
As a new networking topology, Wireless Mesh Networks (WMNs) have advantageous properties in terms of robustness, range extension and density, but also have significant potential disadvantages, which determines some classical load-balancing algorithms are not very suitable for WMNs. In this paper, we propose a novel load-balancing algorithm to improve the networks performance. The new scheme, which...
Delay and Tolerant Networks (DTNs) have been proposed to address data communication challenges in network scenarios, where no instantaneous end-to-end path is guaranteed because of frequent and long duration network partitions. Typical protocols forward a message to multiple nodes to improve message delivery rate. However, a large number of replications consume many system resources that are quite...
Micromobility protocols have been proposed to provide seamless local mobility support. There are several micro mobility protocols such as HMIP, Cellular IP and HAWAII. This paper focuses on the performance of single stream forwarding scheme of HAWAII . An analytical model is developed for the evaluation. The aim of the paper is to investigate the impact of the buffering at the old base station on...
This paper presents a Model of Quality of Service (QoS) for Next Generation Networks (NGN), that consist of a tower of five defined layers such as the Model Layer of QoS, Control of Admission, QoS in the Routing, QoS in the Signaling, and MAC QoS. In addition, the model raises a method based on the concept of segregation of functions defining two functional networks along with the tasks of QoS. Then,...
Mobile sink brings new challenges to densely deployed and large wireless sensor networks (WSNs). When the sink moves, frequent location updates from the sink can generate excessive power consumption of sensors. In this paper, we propose IAR, an Intelligent Agent-based Routing protocol that provides efficient data delivery to mobile sink. Proposed algorithm reduces signal overhead and improve degraded...
In this paper we study the problem of message duplication in dissemination of dynamic content such as news or traffic information over a Dense Mobile Social Network (MSN). In MSNs mobile devices disseminate content only to the nodes whose subscribed interest match it. MSNs are used to improve the coverage and increase capacity as we assume that people in an intermittently connected MSNs are socially-related...
Safety critical applications of IEEE 802.15.4 networks require autonomous network reconfiguration and dynamic meshing in case of node failures or changing environmental influences. In contrast to the classical approach of wireless sensor networks, this paper focuses on the development of enhanced network services like multimedia transmissions in a gas concentration monitoring scenario. Therefore,...
In this paper, we present a geographic routing algorithm which can adapt to different levels of mobility by changing its parameters according to the network in which it is running. Routing decisions are based on directions and geographical positions of the nodes and there is no need for an external location system. Discoveries are done using unicast messages resulting in few control messages being...
This paper presents a reservation based reliability control protocol for wireless sensor networks having the applications that demand in-order and 100% delivery of the generated packets. Unlike earlier works the proposed reliability control avoids channel contention and collision problem during retransmission, and ensures guaranteed packet delivery. Moreover, the reservation based retransmission can...
In wireless sensor networks with mobile sinks, it is a challenge to design reasonable data dissemination protocols to realize reliable, real-time and efficient data transmission from multiple sources to multiple sinks. Recently, many protocols such as TTDD, GHT and LBDD are proposed to solve this problem. However, most of them depend on the whole network topology information to optimize the data dissemination...
Over the past years, location-based routing protocols have been studied extensively in mobile ad hoc networks (MANETs). However, how to efficiently provide the location information for nodes is still a challenge. So far, many protocols have been proposed to solve this problem, most of which offer exact routing location information, and are complicated to implement in practice. In this paper, we propose...
In sparse mobile sensor networks, nodes have a small number of neighbors with intermittent connectivity. This paper presents a new networking protocol for this type of network, aimed at maximizing system performance in terms of both delay and reliability. The system is motivated by the observation that many applications on this type of network have two kinds of co-existing data packets: those with...
Energy (battery) of the sensor node is considered as the scarcest resource in Wireless Sensor Network (WSN), hence a communication protocol that efficiently uses the limited energy must be developed. In this paper, Region-based Energy-aware Clustering (REC) scheme is presented to optimize the energy usage, with clustering has been identified as an effective data forwarding technique in WSN. With REC,...
OLSR is a well-known proactive protocol for wireless networks. Although very efficient by many points, it suffers from the drawbacks of not taking into account QoS metrics such as delay or bandwidth. To overcome this pitfall, some QOLSR (QoS OLSR) solutions have been designed. Nevertheless, they still provide weak performance regarding QoS metrics. In this paper, we introduce a novel and simple neighbor...
Delay Tolerant Network (DTN) is a network paradigm used to deliver messages when network connectivity is not guaranteed. In a DTN, communication is made possible by carriers, mobile nodes that physically carry messages from a network partition to another. Selecting carriers that provide the best delivery probability is a crucial issue. However, if carriers misbehave, the integrity and availability...
The introduction of real time communication has created additional challenges in the wireless networks area with different communication constraints. Sensor nodes spend most of their lifetime functioning as a small router to deliver packets from one node to another until the packet reaches the sink. Since sensor networks represent a new generation of time-critical applications, it is often necessary...
Geographic message forwarding in vehicular ad hoc networks (VANET) has attracted much attention and become one of the most promising research areas recent years. In this paper, inspired with the intuition that drivers' route are with high regularity, we propose a prediction-based message forwarding strategy named Seer. Seer trains a 2nd-order Markov model based on long-term historic trip GPS data...
There have been proposed many geographic multicasting protocols for wireless ad hoc sensor networks. Most of these protocols tend to exploit a Source-initiated Geographic Multicasting (SGM) approach which consists of three phases: first, a source collects the position information of all destination nodes; second, the source constructs a multicast tree through the position information; third, the source...
In recent work it has been shown that the use of virtual coordinates or identifiers for efficient routing and data management has several advantages compared to the use of predefined addresses or geographical coordinates. However, these advantages only hold for single domain networks with limited mobility. In this paper, we discuss the challenges arising from using virtual coordinates for routing...
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