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mobility-model
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Total 22 records
Mobility Pattern Recognition in Mobile Ad-Hoc Networks
, M.Sc. Thesis Sharif University of Technology ; Afshin Hemmatyar, Ali Mohammad (Supervisor)
Abstract
Mobility is one of the most challenging issues in mobile Ad-Hoc networks which has a significant impact on performance of network protocols. To cope with this issue, the protocol designers should be able to analyze the movement of mobile nodes in a particular wireless network. In this thesis, a new framework called Mobility Analyzer has been proposed. At first, Mobility Analyzer categorizes mobility models based on their mobility characteristics; subsequently, it uses mobility metrics for evaluating mobility traces which are collected by GPS or generated by mobility simulators. Finally, Mobility Analyzer recognizes the mobility model of mobility traces based on mobility metrics and measures...
A learning automata-based method for estimating the mobility model of nodes in Mobile Ad-hoc Networks
, Article 7th IEEE International Conference on Cognitive Informatics, ICCI 2008, Stanford University, CA, 14 August 2008 through 16 August 2008 ; 2008 , Pages 249-254 ; 9781424425389 (ISBN) ; Iraji, R ; Manzuri Shalmani, M. T ; Sharif University of Technology
2008
Abstract
The mobility model of typical Mobile Ad-hoc NETworks (MANET) can be used for more efficient performance evaluation of such networks. There are a large number of researches for generating various mobility models to use in performance evaluation of mobile ad-hoc networks and also on performance evaluation itself of these networks. But in most of these researches the mobility model of MANET is predefined and based on this mobility model, the performance evaluation goes on. Since in real world applications the mobility model of MANETs is unknown or may be changed during the time, the need for a method of detecting or estimating the MANET's mobility model is evident. In this paper a learning...
Mobility Prediction in Mobile Ad-Hoc Networks
, M.Sc. Thesis Sharif University of Technology ; Movaghar, Ali (Supervisor)
Abstract
Mobile ad hoc networks (MANETs) are the dynamically reconfigurable wireless networks in which mobile nodes communicate with each other without the need for any fixed infrastructure. In these networks mobile nodes are free to move, therefore, network topology changes rapidly. These changes can lead to significant performance degradations in network protocols. To cope with this, a desired solution is to predict movements of mobile nodes. In this way, we can be prepared for changes. This thesis proposes two mobility prediction methods. In both methods, each node uses the information extracted from its own history of movements to predict its future location. Results obtained by applying two...
Mobility modeling and analytical solution for spatial traffic distribution in wireless multimedia networks
, Article IEEE Journal on Selected Areas in Communications ; Volume 21, Issue 10 , 2003 , Pages 1699-1709 ; 07338716 (ISSN) ; Salehi, J. A ; Sharif University of Technology
2003
Abstract
In this paper, we propose a general mobility model suitable for wireless multimedia networks. Our model is based on splitting a region into subregions. Furthermore, we make an analogy between subregions as well as their inter-connections with a multi-class Jackson queueing network comprising of infinite-server nodes. The main attribute of such a network is due to its product-form stationary distribution. Using this model, we are able to obtain a closed analytical form for the spatial traffic distribution corresponding to a specific number of network-connected users with different classes of service and mobility in a typical region. Also, we show the flexibility obtained by the proposed...
, M.Sc. Thesis Sharif University of Technology ; Ashtiani, Farid (Supervisor)
Abstract
In this thesis, we propose an analytical model in order to evaluate the maximum stable throughput for unicast services in Vehicular Ad hoc NETworks (VANETs). In this respect, we employ two queueing networks in order to model the mobility patterns of the vehicles as well as the multi-hop packet transmission scenario. In the proposed model, we map the features of IEEE 802.11, as well as the details of multi-hop packet transmission, regarding the dynamic status of vehicles, onto suitable parameters of the queueing networks. In our modeling approach, we take the details of MAC and routing schemes into account by classifying the vehicles based on their mobility patterns and considering...
Effect of traffic-load dependent vehicle routing algorithm on the connectivity in VANETs
, Article IEEE Vehicular Technology Conference, 15 May 2011 through 18 May 2011 ; May , 2011 , Page(s): 1 - 5 ; 15502252 (ISSN) ; 9781424483310 (ISBN) ; Ashtiani, F ; Sharif University of Technology
2011
Abstract
In this paper, we evaluate how traffic-load dependent vehicle routing at intersections is able to improve the connectivity status of all streets. To this end, we consider a VANET scenario, comprised of several streets and intersections. Then, we focus on two vehicle routing algorithms, one based on the distance to destination, i.e., traffic-load independent (TLI) algorithm, and another one based on both distance to destination and traffic load status of the local streets, i.e., traffic-load dependent (TLD) algorithm. By employing a simple mobility model based on an open BCMP queueing network, we derive the spatial traffic distribution at two cases. Afterwards, we propose a simple algorithm...
Mobility analyzer: A framework for analysis and recognition of mobility traces in mobile Ad-Hoc networks
, Article 3rd International Conference on New Technologies, Mobility and Security, 20 December 2009 through 23 December 2009 ; 2009 ; 9781424462735 (ISBN) ; Hemmatyar, A. M. A ; Rabiee, H. R ; Mousavi, S. M ; Khaledi, M. H ; Sharif University of Technology
Abstract
Mobility is one of the most challenging issues in mobile Ad-Hoc networks which has a significant impact on performance of network protocols. To cope with this issue, the protocol designers should be able to analyze the movement of mobile nodes in a particular wireless network. In this paper, a new framework called Mobility Analyzer has been introduced for analysis and recognition of mobility traces. At first, the Mobility Analyzer acquires some mobility traces collected by GPS or generated with mobility simulators; then it calculates some mobility metrics which represent the movement behavior of the mobile nodes; finally it attempts to classify mobility traces into particular mobility models...
An area-scalable human-based mobility model
, Article Computer Networks ; Volume 177 , 2020 ; Foroozani, A ; Rezaei, S ; Hemmatyar, A. M. A ; Movaghar, A ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Mobile networks have been growing rapidly, where it is of paramount importance to evaluate the performance of any protocol designed for such networks before deployment. Mobility is one of the main mobile network issues that directly affects performance metrics. Since mobile nodes are often carried by their owners, nodes movement should be modeled according to humans movement. In this paper, we extend our previously published human mobility model based on real collected data. The real human movement is traced, cleaned up and analyzed. To the best of our knowledge, our collected data set is the only one that contains the detail of both walking and driving nodes. The analysis shows several...
SME: Learning automata-based algorithm for estimating the mobility model of soccer players
, Article 6th IEEE International Conference on Cognitive Informatics, ICCI 2007, Lake Tahoe, CA, 6 August 2007 through 8 August 2007 ; October , 2007 , Pages 462-469 ; 1424413273 (ISBN); 9781424413270 (ISBN) ; Sefidpour, A. R ; Manzuri Shalmani, M. T ; Iraji, R ; Sharif University of Technology
2007
Abstract
Soccer model and relation of players and coach has been analyzed by a learning automata-based method, called Soccer Mobility Estimator (SME), who estimates the mobility model of soccer players. During a soccer match, players play according to a certain program designed by coach. The pattern of players' mobility is not stochastic and it can be assumed that they are playing with a certain mobility model. Since knowledge about mobility model of nodes in mobile ad-hoc networks has a substantial effect on its performance evaluation, knowledge about mobility model of soccer players can be useful for coaches and experts for game analysis. In fact the mobility model of players could be an important...
Mobility pattern recognition in mobile ad-hoc networks
, Article 4th International Conference on Mobile Technology, Applications and Systems, Mobility 2007, Incorporating the 1st International Symposium on Computer Human Interaction in Mobile Technology, IS-CHI 2007, Singapore, 10 September 2007 through 12 September 2007 ; 2007 , Pages 302-309 ; 9781595938190 (ISBN) ; Rabiee, H. R ; Moshref, M ; Dabirmoghaddam, A ; Sharif University of Technology
2007
Abstract
A Mobile Ad hoc Network (MANET) is a collection of wireless mobile nodes forming a self-configuring network without using any existing infrastructure. Network nodes in a mobile Ad-hoc network move in some motion patterns called mobility models. The mobility models play a very important role in determining the protocol performance in MANET. Thus, it is essential to study and analyze various mobility models and their effect on MANET protocols. If we can recognize the mobility pattern of motion of mobile nodes in our environment we can customize our network protocols to deal with that existing mobility model. In this paper we introduce a new method for classification and pattern recognition of...
New Mobility Model for MANETs Based on Real Data of Human Mobility
, M.Sc. Thesis Sharif University of Technology ; Hemmatyar, Ali Mohammad Afshin (Supervisor)
Abstract
Due to difficulties in setting up real mobile ad hoc networks, researchers must use simulation tools to evaluate their new protocols. One of the most important issues in MANET simulations is node movements. In reality nodes in MANET are transported by peopleand because of this,mobility models are based on human mobility. On the other hand, data of human mobility are rare and they are related to special locations so, none of the existing models have all the human mobility properties. By collecting data of human mobilityin the city of Tehran, new mobility model has been proposed that captures human mobility properties and is more realistic than existing models
Real Time Location Finding for Vehicles in Transport Systems
, M.Sc. Thesis Sharif University of Technology ; Hemmatyar, Afshin (Supervisor)
Abstract
In mobile ad hoc networks, having an efficient routing protocol to deal with dynamics in network topology, based on the user behavior learning, has a significant role in generating more accurate results. It is valuable to use a realistic mobility model in such networks so that the results from the simulation will reflect the actual reaction of mobile nodes in the real world. Using a realistic mobility model helps simulation to have more accurate results in comparison with other kinds of mobility models especially in a Vehicular Ad hoc Network (VANET). Before exchanging information between moving vehicles, the destination node should be located. However, the existing location service...
Design and Development of a Mobility Recognition System in PD Patients for Tele-rehabilitation
, M.Sc. Thesis Sharif University of Technology ; Behzadipour, Saeed (Supervisor) ; Alibiglou, Laila (Co-Supervisor)
Abstract
Parkinson's disease is a neurodegenerative disorder that affects motor functions. Performing mobility exercises help patients slowing down the progression of the illness and improving symptoms of the disease. Assessment and evaluation of activities of mobility exercises are critical for any treatment program particularly in tele-rehabilitation system. The purpose of the current study is to design an affordable and accurate wearable device with inertial measurement units (IMUs) for mobility activity recognition in Parkinson’s patients. The optimum number and arrangement (i.e. configuration) were found to minimize the cost while maintaining a fair accuracy. The activity recognition was...
Expert key selection impact on the MANETs' performance using probabilistic key management algorithm
, Article SIN 2013 - Proceedings of the 6th International Conference on Security of Information and Networks ; 2013 , Pages 347-351 ; 9781450324984 (ISBN) ; Minaei, M ; Golkari, M ; Movaghar, A ; Sharif University of Technology
2013
Abstract
Mobile ad hoc networks (MANETs) have been turned into very attractive area of research in the duration of recent years, whereas security is the most challenging point that they undergo. Cryptography is an essential solution for providing security within MANETs. However, storing all keys in every node, if practically possible, is inefficient in large scale MANETs due to some limitations such as memory or process capability. This paper extends our previous idea which was a novel probabilistic key management algorithm that stores only a few randomly chosen keys instead of all ones. In this paper, several different scenarios are proposed for key selection in which they are more practical, and...
Fuzzy mobility analyzer: A framework for evaluating mobility models in mobile ad-hoc networks
, Article IEEE Wireless Communications and Networking Conference, WCNC, 18 April 2010 through 21 April 2010 ; April , 2010 ; 15253511 (ISSN) ; 9781424463985 (ISBN) ; Rabiee, H. R ; Khaledi, M. H ; Sharif University of Technology
2010
Abstract
Mobility is one of the most challenging issues in mobile ad-hoc networks and has a significant impact on performance of network protocols. Different kinds of mobility models have been proposed to represent the movement pattern of mobile nodes in mobile ad-hoc networks. These models attempt to capture various mobility characteristics existing in real movement of mobile nodes. In this paper, a new framework called Fuzzy Mobility Analyzer has been proposed to evaluate mobility models. At first, our framework categorizes mobility models based on their mobility characteristics into five classes; subsequently it uses mobility metrics to capture the mobility and graph connectivity characteristics...
Mobility aware distributed topology control in mobile ad-hoc networks with model based adaptive mobility prediction
, Article 3rd IEEE International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2007, White Plains, NY, 8 October 2007 through 10 October 2007 ; 2007 , Pages 86- ; 0769528899 (ISBN); 9780769528892 (ISBN) ; Rabiee, H. R ; Moshref, M ; Dabirmoghaddam, A ; Sharif University of Technology
IEEE Computer Society
2007
Abstract
Topology control in mobile ad-hoc networks allows better spatial reuse of the wireless channel and control over network resources. Topology control algorithms tend to optimize network power usage by keeping the topology connected. However, few efforts have focused on the issue of topology control with mobility. One of the most efficient mobility aware topology control protocols is the "Mobility Aware Distributed Topology Control Protocol". The major problem with this protocol is the future distance predictor which uses mobility prediction to estimate the future distance of neighboring nodes. The efficiency of this estimator varies in presence of different mobility models, sampling rates and...
Mobility aware distributed topology control in mobile ad-hoc networks using mobility pattern matching
, Article WiMob 2009 - 5th IEEE International Conference on Wireless and Mobile Computing Networking and Communication, 12 October 2009 through 14 October 2009, Marrakech ; 2009 , Pages 453-458 ; 9780769538419 (ISBN) ; Mousavi, S. M ; Rabiee, H. R ; Movaghar, A ; Khaledi, MJ ; Ardakanian, O ; Sharif University of Technology
Abstract
Topology control algorithms in mobile ad-hoc networks aim to reduce the power consumption while keeping the topology connected. These algorithms can preserve network resources and increase network capacity. However, few efforts have focused on the issue of topology control in presence of node mobility. One of the notable mobility aware topology control protocols is the "Mobility Aware Distributed Topology Control Protocol". The main drawback of this protocol is on its mobility prediction method. This prediction method assumes linear movements and is unable to cope with sudden changes in the mobile node movements. In this paper, we propose a pattern matching based mobility prediction method...
A Realistic Urban Mobility Model for Mobile Ad Hoc Network
, M.Sc. Thesis Sharif University of Technology ; Manzuri, Mohammad Taghi (Supervisor)
Abstract
A Mobile Ad hoc NETwork (MANET) is a set of wireless mobile nodes that form a self configured network. MANETs do not have infrastructure and are not currently deployed on large scales. So research in this area is simulation based. Mobility model in a mobile ad hoc network explains the movement pattern of mobile users and is designed to describe the change of their location, velocity and acceleration over time. One of the challenges in this field is the definition of a common mobility model that provides an accurate and realistic movement description of mobile nodes. In this thesis we want to study the mobility pattern of vehicles on Kish Island and compare it with different kinds of...
Analysis of link lifetime in wireless mobile networks
, Article Ad Hoc Networks ; Volume 10, Issue 7 , September , 2012 , Pages 1221-1237 ; 15708705 (ISSN) ; Sarbazi Azad, H ; Sharif University of Technology
Abstract
Link lifetime (LL) analysis is crucially important in designing and evaluating wireless mobile network protocols. Although a considerable amount of research has been conducted on this issue, the current paper studies several aspects of link lifetime for the first time, e.g. a closed form expression for the probability distribution of the residual link lifetime (RLL) for the constant velocity mobility model is obtained, which facilitates marginal studies on the behavior of link lifetime. As a case, using a tail analysis of LL and RLL distributions, we analytically prove that they are heavy-tailed. Using this outcome, a self-similar behavior in the traffic pattern of a sample delay tolerant...
Mobility modeling, spatial traffic distribution, and probability of connectivity for sparse and dense vehicular ad hoc networks
, Article IEEE Transactions on Vehicular Technology ; Volume 58, Issue 4 , 2009 , Pages 1998-2007 ; 00189545 (ISSN) ; Ashtiani, F ; Javanmard, A ; Hamdi, M ; Sharif University of Technology
2009
Abstract
The mobility pattern of users is one of the distinct features of vehicular ad hoc networks (VANETs) compared with other types of mobile ad hoc networks (MANETs). This is due to the higher speed and the roadmap-restricted movement of vehicles. In this paper, we propose a new analytical mobility model for VANETs based on product-form queueing networks. In this model, we map the topology of the streets and the behavior of vehicles at both intersections and different parts of the streets onto different parameters of a BCMP1 open queueing network comprising M/G/nodes. This model represents a sparse situation for VANETs. To include the effect of dense situation on the mobility model, we modify the...