Temat: ad-hoc networks - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Providing QoS Guarantees in Broadband Ad Hoc Networks
Autorzy:: Natkaniec, M.
Kosek-Szott, K.
Szott, S.
Głowach, A.
Pach, A. R.
Powiązania:: https://bibliotekanauki.pl/articles/308394.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad-hoc networks
QoS
IEEE 802.11 EDCA
Opis:: This paper presents a novel QoS architecture for IEEE 802.11 multihop broadband ad hoc networks integrated with infrastructure. The authors describe its features, including MAC layer measurements, traffic differentiation, and admission control. The modules required by the network elements as well as their integration are also presented. Additionally, the paper presents results which validate its correct operation and prove its superiority over plain IEEE 802.11. The authors are convinced that the proposed solution will provide QoS support for a variety of services in future mobile ad hoc networks.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 4; 92-98
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Parallel and Distributed Simulation of Ad Hoc Networks
Autorzy:: Sikora, A.
Niewiadomska-Szynkiewicz, E.
Powiązania:: https://bibliotekanauki.pl/articles/309034.pdf
Data publikacji:: 2009
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad hoc networks
distributed simulation
mobile network
software systems
Opis:: Modeling and simulation are traditional methods used to evaluate wireless network design. This paper addresses issues associated with the application of parallel discrete event simulation to mobile ad hoc networks design and analysis. The basic characteristics and major issues pertaining to ad hoc networks modeling and simulation are introduced. The focus is on wireless transmission and mobility models. Particular attention is paid to the MobASim system, a Javabased software environment for parallel and distributed simulation of mobile ad hoc networks. We describe the design, performance and possible applications of presented simulation software.
Źródło:: Journal of Telecommunications and Information Technology; 2009, 3; 76-84
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: LPAR: an adaptive routing strategy for MANETs
Autorzy:: Abolhasan, M.
Wysocki, T. A.
Dutkiewicz, E.
Powiązania:: https://bibliotekanauki.pl/articles/307737.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: LPAR
GPS-based routing protocol
mobile ad hoc networks
Opis:: This paper presents a new global positioning system (GPS)-based routing protocol, called location-based point-to-point adaptive routing (LPAR) for mobile ad hoc networks. This protocol utilises a 3-state route discovery strategy in a point-to-point manner to reduce routing overhead while maximising throughput in medium to large mobile ad hoc networks. In LPAR, data transmission is adaptable to changing network conditions. This is achieved by using a primary and a secondary data forwarding strategy to transfer data from the source to the destination when the condition of the route is changed during data transmission. A simulation study is performed to compare the performance of LPAR with a number of different exisiting routing algorithms. Our results indicate that LPAR produces less overhead than other simulated routing strategies, while maintains high levels of throughput.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 2; 28-37
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Multiobjective Design of Wireless Ad Hoc Networks: Security, Real-Time and Lifetime
Autorzy:: Zdravko, K.
Powiązania:: https://bibliotekanauki.pl/articles/308972.pdf
Data publikacji:: 2009
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad hoc networks
low-power routing
multihop communication
secure routing
Opis:: This paper deals with the tradeoffs between security, real-time and lifetime performance. Due to the multihop nature of communication wireless ad hoc networks are very vulnerable to attacks. Malicious nodes included in a routing path may misbehave and organize attacks such as black holes. Scaling the number of hops for a packet delivery we trade off energy efficiency against security and real-time communication. To study the multihop communication we propose a hierarchical communication model. The REWARD (receive, watch, redirect) algorithm for secure routing is employed as a main example for corrective actions. Symmetrical routing is a distinguish feature of protocols such as REWARD and we outline the threshold of conflict between power-efficient partitioning of communication links and symmetrical routing.
Źródło:: Journal of Telecommunications and Information Technology; 2009, 2; 13-21
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Performance analysis of reactive shortest path and multi-path routing mechanism with load balance
Autorzy:: Pham, P.P.
Perreau, S.
Powiązania:: https://bibliotekanauki.pl/articles/307735.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad hoc networks
load balance
multi-path routing protocol
overheads
Opis:: Research on multi-path routing protocols to provide improved throughput and route resilience as compared with single-path routing has been explored in details in the context of wired networks. However, multi-path routing mechanism has not been explored thoroughly in the domain of ad hoc networks. In this paper, we analyze and compare reactive single-path and multi-path routing with load balance mechanisms in ad hoc networks, in terms of overhead, traffic distribution and connection throughput. The results reveals that in comparison with general single-path routing protocol, multi-path routing mechanism creates more overheads but provides better performance in congestion and capacity, provided that the route length is within a certain upper bound which is derivable. The analytical results are further confirmed by simulation.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 2; 38-47
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Comparative Study of Wireless Sensor Networks Energy-Efficient Topologies and Power Save Protocols
Autorzy:: Niewiadomska-Szynkiewicz, E.
Kwaśniewski, P.
Windyga, I.
Powiązania:: https://bibliotekanauki.pl/articles/309032.pdf
Data publikacji:: 2009
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad hoc networks
energy conservation protocols
topology control
wireless sensor network
Opis:: Ad hoc networks are the ultimate technology in wireless communication that allow network nodes to communicate without the need for a fixed infrastructure. The paper addresses issues associated with control of data transmission in wireless sensor networks (WSN) - a popular type of ad hoc networks with stationary nodes. Since the WSN nodes are typically battery equipped, the primary design goal is to optimize the amount of energy used for transmission. The energy conservation techniques and algorithms for computing the optimal transmitting ranges in order to generate a network with desired properties while reducing sensors energy consumption are discussed and compared through simulations. We describe a new clustering based approach that utilizes the periodical coordination to reduce the overall energy usage by the network.
Źródło:: Journal of Telecommunications and Information Technology; 2009, 3; 68-75
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Multiobjective Approach to Localization in Wireless Sensor Networks
Autorzy:: Marks, M.
Niewiadomska-Szynkiewicz, E.
Powiązania:: https://bibliotekanauki.pl/articles/309060.pdf
Data publikacji:: 2009
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad hoc networks
localization
simulated annealing
stochastic optimization
wireless sensor network
Opis:: Wireless sensor network localization is a complex problem that can be solved using different types of methods and algorithms. Nowadays, it is a popular research topic. What becomes obvious is that there are several criteria which are essential when we consider wireless sensor networks. Our objective is to determine accurate estimates of nodes location under the constraints for hardware cost, energy consumption and computation capabilities. In this paper the application of stochastic optimization for performing localization of nodes is discussed. We describe two phase scheme that uses a combination of the trilateration method, along with the simulated annealing optimization algorithm. We investigate two variants of our technique, i.e., centralized and distributed. The attention is paid to the convergence of our algorithm for different network topologies and trade-off between its efficiency and localization accuracy.
Źródło:: Journal of Telecommunications and Information Technology; 2009, 3; 59-67
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Simulating capture behaviour in 802.11 radio modems
Autorzy:: Ware, C.
Wysocki, T. A.
Chicharo, J.
Powiązania:: https://bibliotekanauki.pl/articles/309552.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: wireless local area networks
ad hoc networks
capture models
medium access control protocol
fairness
Opis:: Simulation plays an important role in the performance evaluation of MAC protocols. Building simulation models which are able to accurately model physical behaviour is fundamental to the outcome of such techniques. Through both qualitative and quantitative comparison of experimental trace data against simulation results obtained using delay, power, and hybrid capture models, this paper investigates the performance of various packet capture models in the simulation analysis of the 802.11 PHY and MAC layer protocols. We illustrate these models are unable to accurately describe the fairness properties of the experimental data. A new model is proposed, Message Retraining, to describe the operation of an 802.11 receiver. We illustrate that the Message Retraining reception model is able to model the fairness characteristics obtained with an IEEE 802.11 radio modem more accurately than the previous capture models.
Źródło:: Journal of Telecommunications and Information Technology; 2001, 3; 46-54
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: On the Optimal Design of a Broadcast Data Dissemination System over VANET Providing V2V and V2I Communications "The Vision of Rome as a Smart City"
Autorzy:: Palma, V.
Vegni, A. M.
Powiązania:: https://bibliotekanauki.pl/articles/307842.pdf
Data publikacji:: 2013
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: broadcast protocol
IEEE 802.11
V2V
V2I
Vehicular Ad hoc Networks
Opis:: In different this paper we present the performance evaluation study of a simple broadcast data dissemination technique in new emerging Vehicular Ad hoc Networks (VANETs). Differently from the traditional Mobile Ad hoc NETworks (MANETs), VANETs require particular routing protocols, due to the high dynamism of the network topology, and to different traffic and mobility patterns. For safety and emergency message applications, broadcast data dissemination is an important key factor in VANETs. However, the design of optimal deployment of relay nodes in different network scenarios allows to enhance system performance. At this aim, this work analyzes vehicular network performances in terms of throughput and delays, for different traffic scenarios, exploiting both inter-vehicular communications, as well as the availability of fixed network infrastructure.
Źródło:: Journal of Telecommunications and Information Technology; 2013, 1; 41-48
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: On a practical approach to low-cost ad hoc wireless networking
Autorzy:: Gburzyński, P.
Olesiński, W.
Powiązania:: https://bibliotekanauki.pl/articles/308509.pdf
Data publikacji:: 2008
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad hoc wireless networks
sensor networks
operating systems
reactive systems
specification
simulation
Opis:: Although simple wireless communication involving nodes built of microcontrollers and radio devices from the low end of the price spectrum is quite popular these days, one seldom hears about serious wireless networks built from such devices. Most of the commercially available nodes for ad hoc networking (somewhat inappropriately called "motes") are in fact quite serious computers with megabytes of RAM and rather extravagant resource demands. We show how one can build practical ad hoc networks using the smallest and cheapest devices vailable today. In our networks, such devices are capable of sustaining swarm-intelligent sophisticated routing while offering enough processing power to cater to complex applications involving distributed sensing and monitoring.
Źródło:: Journal of Telecommunications and Information Technology; 2008, 1; 29-42
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: LDAOR - Location and Direction Aware Opportunistic Routing in Vehicular Ad hoc Networks
Autorzy:: Barootkar, M.
Rahbar, A. G.
Sabaei, M.
Powiązania:: https://bibliotekanauki.pl/articles/309175.pdf
Data publikacji:: 2016
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: carry-and-forward mechanism
contact history knowledge
direction and location aware routing
opportunistic routing
vehicular ad hoc networks
Opis:: Routing in Vehicular Ad hoc Networks (VANETs) has found significant attention because of its unique features such as lack of energy constraints and high-speed vehicles applications. Besides, since these networks are highly dynamic, design process of routing algorithms suitable for an urban environment is extremely challenging. Appropriate algorithms could be opportunistic routing (OR) where traffic transmission is performed using the store-carry-forward mechanism. An efficient OR mechanism, called Location and Direction Aware Opportunistic Routing (LDAOR), is proposed in this paper. It is based on the best neighbor node selection by using vehicles positions, vehicles directions, and prioritization of messages from buffers, based on contact histories and positions of neighbor nodes to destination. In LDAOR, when multiple nodes make contact with a carrier node, the closest neighbor node to destination is selected as the best forwarder. However, when only one node makes contact with the carrier node, the message is delivered to it if it moves toward the destination. Using the ONE simulator, the obtained performance evaluation results show that the LDAOR operates better than conventional OR algorithms. The LDAOR not only increases delivery rate, but also reduces network overhead, traffic loss, and number of aborted messages.
Źródło:: Journal of Telecommunications and Information Technology; 2016, 1; 68-83
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Flow Aggregation for Energy-Aware Ad-Hoc Wireless Networks Respecting QoS Provisions
Autorzy:: Boukrim, Mustapha
Antari, Jilali
Powiązania:: https://bibliotekanauki.pl/articles/308936.pdf
Data publikacji:: 2020
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: ad hoc wireless networks
flow aggregation
global energy consumption
ILP
QoS provisions
Opis:: Emerging communication technologies are now leading developers to design IT systems taking into count their energy-related considerations. Much research performed in the area of ad-hoc wireless networks tends to distribute the ﬂows over all nodes of the network, which increases the amount of energy consumed by each node and reduces longevity of the network. To overcome these problems, this paper seeks to aggregate a set of ﬂows within a number of nodes that is as low as possible in order to be capable of routing those ﬂows. This proposal allows to maximize the number of network nodes that may be turned oﬀ. The proposed solution was formulated as an integer linear programming (ILP) problem using a set of energy and quality of service (QoS) constraints. This formulation minimizes the total energy consumed by the nodes to construct a topology network that is capable of meeting QoS requirement for a set ﬂows inserted into the network. To evaluate the eﬃciency of the proposed model, a performance-based comparison was conducted with another routing model. The simulation results show that the proposed model oﬀers better performance in terms of global energy consumption and network load.
Źródło:: Journal of Telecommunications and Information Technology; 2020, 1; 31-38
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Heavy Gas Cloud Boundary Estimation and Tracking using Mobile Sensors
Autorzy:: Krzysztoń, M.
Niewiadomska-Szynkiewicz, E.
Powiązania:: https://bibliotekanauki.pl/articles/309177.pdf
Data publikacji:: 2016
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: deployment strategies
heavy gas cloud boundary tracking
MANET
mobile ad hoc network
mobility models
sensor networks
Opis:: This paper addresses issues concerned with design and managing of monitoring systems comprised of mobile wireless sensing devices (MANETs). The authors focus on self-organizing, cooperative and coherent networks that maintain a continuous communication with a central operator and adopt to changes in an unknown environment to achieve a given goal. The attention is focused on the development of MANET for heavy gas clouds detection and its boundary estimating and tracking. Two strategies for constructing the MANET are described, in which sensors explore the region of interest to detect the gas cloud, create temporary network topology and finally, cover the cloud boundary, and track the moving cloud. The utility and efficiency of the proposed strategies has been justified through simulation experiments.
Źródło:: Journal of Telecommunications and Information Technology; 2016, 3; 38-49
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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