Bibliografías temáticas / IEEE802.11p

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Literatura académica sobre el tema "IEEE802.11p"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 4 de mayo de 2024

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Artículos de revistas sobre el tema "IEEE802.11p"

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Mohi Uddin, Khandaker Mohammad, Nayeema Islam, Nur-A. Alam y Jahanara Akhtar. "Performance Comparison of IEEE802.11a, IEEE802.11b, IEEE802.11g and IEEE802.11n in Multiple Routers". Asian Journal of Applied Science and Technology 04, n.º 04 (2020): 65–72. http://dx.doi.org/10.38177/ajast.2020.4406.

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Ali Mohammed, Almutaz y Ibrahim Elimam Abdalla. "Performance Analysis of FTP, HTTP and Database for IEEE802.11, IEEE802.11a, IEEE802.11b and IEEE802.11g using OPNET Simulator". International Journal of Computer Trends and Technology 38, n.º 2 (25 de agosto de 2016): 57–62. http://dx.doi.org/10.14445/22312803/ijctt-v38p111.

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Yoon, Sanghun, Seongkeun Jin, Daegyo Shin y Kitaeg Lim. "Diversity modem for IEEE802.11p WAVE". Journal of IKEEE 18, n.º 4 (31 de diciembre de 2014): 495–501. http://dx.doi.org/10.7471/ikeee.2014.18.4.495.

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Ammar, F. y Hanafi Hanafi. "ANALISIS TRANSFER RATE WIRELESS LOCAL AREA NETWORK DENGAN STANDAR IEEE 802.11A DAN IEEE 802.11G PADA KANAL LINE OF SIGHT". Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering) 3, n.º 1 (26 de abril de 2016): 31–39. http://dx.doi.org/10.33019/ecotipe.v3i1.28.

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WiFi bekerja pada band 2,4 GHz dan 5 GHz. Standar WiFi yang bekerja pada frekuensi ini antara lain IEEE802.11g dan IEEE802.11a. Pada penelitian ini dilakukan pengukuran terhadap transfer rate download dan upload data dengan standar IEEE802.11g dan IEEE802.11a. Pengukuran dilakukan pada kanal Line of Sight (LOS), menggunakan dua buah laptop yang dihubungkan dengan Access Point (AP) standar IEEE802.11g dan IEEE802.11a. Hasil penelitian diperoleh, pada standar IEEE802.11g, transfer rate download dan upload data tertinggi 2.662,54.KB/s dan 2.549,60 KB/s, dan terendah 484,50.KB/s dan 477,40 KB/s, sedangkan pada standar IEEE802.11a, transfer rate download dan upload data tertinggi 8.104,68 KB/s dan 5.744,24 KB/s, dan terendah 872,24 KB/s dan 465,38.KB/s. Pada standar IEEE802.11g, transfer rate download dan upload data pada sinyal terendah hingga di bawah 35% dan 30%, dari transfer rate download dan upload data tertinggi. Pada standar IEEE802.11a, transfer rate download dan upload data pada kualitas sinyal terendah hingga di bawah 20% dan 30%, dari transfer rate download dan upload data tertinggi. Kemampuan transfer rate download data Standar IEEE802.11a, 2–3 kali lebih baik pada kondisi kualitas sinyal tertinggi, dan tidak lebih dari 2 kali pada kondisi kualitas sinyal terendah, dibandingkan kemampuan transfer rate download data standar IEEE802.11g. Kemampuan transfer rate upload data Standar IEEE802.11a, 1,4–3 kali lebih baik pada kondisi kualitas sinyal tertinggi, dan 1-3 kali lebih baik pada kondisi kualitas sinyal terendah, dibandingkan kemampuan transfer rate upload data standar IEEE802.11g.
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Yadav, Shalini, Rahul Rishi, Yudhvir Singh, Zaid khudhur Hussein, Ahmed Ayoob Ibrahim y Sajjad Ali Ettyem. "Traffic Management in Ad-Hoc Network by Selection of Suitable Routing Protocol". Journal of Physics: Conference Series 2322, n.º 1 (1 de agosto de 2022): 012096. http://dx.doi.org/10.1088/1742-6596/2322/1/012096.

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Abstract The need for traffic management has risen at the same pace as the number of cars has changed dramatically. Even though VANET and MANET have seen tremendous growth, traffic management is still essential. There is a demand for effective traffic management among the vehicles, which necessitates their communication ability. Routing protocols facilitate the transmission of data between vehicles. There are several routing protocols in a MANET, and choosing the optimal one is challenging. The IEEE802.11p standard is used for data transfer via routing protocols in the current operational environment. C-V2X is a developing technology superior to IEEE802.11p in terms of efficiency. Qualcomm is the creator of C-V2X. AODV, AMODV, and MDART are some appropriate routing protocols for evaluation. The Average End-to-End Delay, Average Throughput, and Packet Delivery Ratio of each protocol are analyzed. The Network Simulator 2.35 (NS2) simulates these routing protocols. This article concludes that the performance of C-V2X using AOMDV protocols is superior to that of IEEE802.11p. This research claims that AOMDV’s architecture might be improved to provide more accurate figures for the average end-to-end latency.
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Alwer, Abdulkader O., Jawad Rasheed, Adnan M. Abu-Mahfouz y Parvaneh Shams. "Study and Evaluation of Quality of Services in Mobile Internet Protocol v6 Using IEEE802.11e". Wireless Communications and Mobile Computing 2022 (17 de noviembre de 2022): 1–11. http://dx.doi.org/10.1155/2022/3092512.

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Mobile Internet Protocol v6 (MIPv6) is a protocol that allows a mobile node (MN) to transparently maintain connections while moving from one subnet to another. Using the route optimization (RO) method in MIPv6 gives optimized routing and helps avoid triangular routing. In real-time applications such as video conference applications, quality of service (QoS) issues will increase especially in the handover process between subnets. This study investigates the performance of MIPv6 handover in IEEE802.11e standard in wireless environments. The investigation considers that handover for the MN moves between 2 home agents (HA). The system model’s fundamental performance limits are measured by packet delay variation, HA binding delay, and wireless local area network (WLAN) media access delay analysis metrics in video conference applications. According to the results of real-time simulations, network performance during the handover process can be effectively improved as the packet lost during handover decreased significantly from 43% in IEEE802.11b distributed coordination function (DCF) to 36% in IEEE802.11e hybrid coordination function (HCF). Furthermore, experimental results prove that IEEE802.11e connects to new HA roughly 20% quicker than IEEE802.11b, and IEEE802.11b has 100 times more time delay than IEEE802.11e. In addition to this, the WLAN media access delay of IEEE802.11b often reaches 0.00011 s as compared to 0.000005 s of IEEE802.11e. Thus, it is evident that the performance of IEEE802.11e in terms of packet delay variation, HA binding delay, and WLAN media access delay is better than IEEE802.11b. Likewise, it is noted that network speed during the handover process in IEEE802.11e can be considerably improved in a MIPv6 scenario.
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Yoon, Sang-Hun, Seong-Keun Jin, Dae-Kyo Shin, Ki-Taeg Lim y Han-Gyun Jung. "Decision Feedback Based Diversity Modem for IEEE802.11p WAVE". Journal of IKEEE 19, n.º 3 (30 de septiembre de 2015): 400–406. http://dx.doi.org/10.7471/ikeee.2015.19.3.400.

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Jin, Seong-Keun, Sang-Hun Yoon y Dae-Kyo Shin. "Performances of Various AGC Algorithms for IEEE802.11p WAVE". Journal of IKEEE 18, n.º 4 (31 de diciembre de 2014): 502–8. http://dx.doi.org/10.7471/ikeee.2014.18.4.502.

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Cui, Xuerong, Juan Li y Bing Li. "Wireless Ranging Method for Vehicular Node based-on IEEE802.11p Short Preamble". Procedia Computer Science 129 (2018): 115–22. http://dx.doi.org/10.1016/j.procs.2018.03.087.

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Husain, Akhtar y S. C. Sharma. "Simulated Analysis of Location and Distance Based Routing in VANET with IEEE802.11p". Procedia Computer Science 57 (2015): 323–31. http://dx.doi.org/10.1016/j.procs.2015.07.346.

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Tesis sobre el tema "IEEE802.11p"

1

Chakroun, Omar. "Techniques de contrôle de congestion et de dissémination d'informations dans les réseaux véhiculaires". Thèse, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5893.

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Les réseaux véhiculaires, connus sous le terme VANETs, sont des réseaux impliquant des communications entre deux ou plusieurs véhicules et éventuellement une communication avec des éléments d’infrastructure sur la route. Récemment, le concept de systèmes de transports intelligent a connu beaucoup d’intérêt. Les STI sont des systèmes utilisant les nouvelles technologies de communication sans fil appliquées au domaine du transport pour améliorer la sécurité routière, la logistique et les services d’information. Des défis majeurs ont besoin cependant d'être abordés pour offrir une communication sur la route sécurisée et fiable dans des environnements anonymes et quelquefois hostiles à la communication. Comme dans tout système de communication, les réseaux véhiculaires doivent opérer en respectant des contraintes en termes de qualité de service. Ces contraintes sont d’autant plus strictes quand il s’agit de fournir des services de sécurité sur la route. Ce projet vise à développer des techniques de communication véhiculaires pour le relayage d’informations de manière fiable et à faible délai entre véhicules voyageant à haute vitesse. Ces techniques devront permettre de respecter des contraintes temporelles sévères afin d’envisager leur utilisation dans des applications de sécurité sur la route. Pour ce faire, cette thèse proposera d’abord des techniques efficaces de dissémination d’informations utilisant des approches multi-métriques basées sur différentes mesures en temps-réel. Des méthodes de relayage seront proposées qui permettent de diminuer les délais d’acheminement et augmenter la probabilité de réception. Ces méthodes utiliseront, entre autres, des approches d’adaptation de la portée et/ou de la priorité des messages en fonction de leur type et de l’intérêt éventuels des véhicules récepteurs en la réception de ces messages. Dans un second volet, ce projet proposera des concepts et des méthodes afin de palier au problème de congestion dans les réseaux véhiculaires qui peut résulter conjointement à la dissémination d’informations. Ces concepts et méthodes viseront à respecter la fiabilité exigée par les applications de sécurité, tout en restant conforme aux nouveaux standards de communications véhiculaires.
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2

Azizian, Meysam. "Partage des ressources dans le nuage de véhicules". Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11526.

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Au cours des dernières années, on a observé l'intérêt croissant envers l'accessibilité à l'information et, en particulier, envers des approches innovantes utilisant les services à distance accessibles depuis les appareils mobiles à travers le monde. Parallèlement, la communication des véhicules, utilisant des capteurs embarqués et des dispositifs de communication sans fil, a été introduite pour améliorer la sécurité routière et l'expérience de conduite à travers ce qui est communément appelé réseaux véhiculaires (VANET). L'accès sans fil à l’Internet à partir des véhicules a déclenché l'émergence de nouveaux services pouvant être disponibles à partir ceux-ci. Par ailleurs, une extension du paradigme des réseaux véhiculaires a été récemment promue à un autre niveau. Le nuage véhiculaire (Vehicular Cloud) (VC) est la convergence ultime entre le concept de l’infonuagique (cloud computing) et les réseaux véhiculaires dans le but de l’approvisionnement et la gestion des services. Avec cette approche, les véhicules peuvent être connectés au nuage, où une multitude de services sont disponibles, ou ils peuvent aussi être des fournisseurs de services. Cela est possible en raison de la variété des ressources disponibles dans les véhicules: informatique, bande passante, stockage et capteurs. Dans cette thèse, on propose des méthodes innovantes et efficaces pour permettre la délivrance de services par des véhicules dans le VC. Plusieurs schémas, notamment la formation de grappes ou nuages de véhicules, la planification de transmission, l'annulation des interférences et l'affectation des fréquences à l'aide de réseaux définis par logiciel (SDN), ont été développés et leurs performances ont été analysées. Les schémas de formation de grappes proposés sont DHCV (un algorithme de clustering D-hop distribué pour VANET) et DCEV (une formation de grappes distribuée pour VANET basée sur la mobilité relative de bout en bout). Ces schémas de regroupement sont utilisés pour former dynamiquement des nuages de véhicules. Les systèmes regroupent les véhicules dans des nuages qui ne se chevauchent pas et qui ont des tailles adaptées à leurs mobilités. Les VC sont créés de telle sorte que chaque véhicule soit au plus D sauts plus loin d'un coordonnateur de nuage. La planification de transmission proposée implémente un contrôle d'accès moyen basé sur la contention où les conditions physiques du canal sont entièrement analysées. Le système d'annulation d'interférence permet d'éliminer les interférences les plus importantes; cela améliore les performances de planification d’utilisation de la bande passante et le partage des ressources dans les nuages construits. Enfin, on a proposé une solution à l'aide de réseaux définis par logiciel, SDN, où différentes bandes de fréquences sont affectées aux différentes liens de transmission de chaque VC afin d’améliorer les performances du réseau.
Abstract : In recent years, we have observed a growing interest in information accessibility and especially innovative approaches for making distant services accessible from mobile devices across the world. In tandem with this growth of interest, there was the introduction of vehicular communication, also known as vehicular ad hoc networks (VANET), leveraging onboard sensors and wireless communication devices to enhance road safety and driving experience. Vehicles wireless accessibility to the internet has triggered the emergence of service packages that can be available to or from vehicles. Recently, an extension of the vehicular networks paradigm has been promoted to a new level. Vehicular cloud (VC) is the ultimate convergence between the cloud computing concept and vehicular networks for the purpose of service provisioning and management. Vehicles can get connected to the cloud, where a multitude of services are available to them. Also vehicles can offer services and act as service providers rather than service consumers. This is possible because of the variety of resources available in vehicles: computing, bandwidth, storage and sensors. In this thesis, we propose novel and efficient methods to enable vehicle service delivery in VC. Several schemes including cluster/cloud formation, transmission scheduling, interference cancellation, and frequency assignment using software defined networking (SDN) have been developed and their performances have been analysed. The proposed cluster formation schemes are DHCV (a distributed D-hop clustering algorithm for VANET) and DCEV (a distributed cluster formation for VANET based on end-to-end relative mobility). These clustering schemes are used to dynamically form vehicle clouds. The schemes group vehicles into non-overlapping clouds, which have adaptive sizes according to their mobility. VCs are created in such a way that each vehicle is at most D-hops away from a cloud coordinator. The proposed transmission scheduling implements a contention-free-based medium access control where physical conditions of the channel are fully analyzed. The interference cancellation scheme makes it possible to remove the strongest interferences; this improves the scheduling performance and resource sharing inside the constructed clouds. Finally, we proposed an SDN based vehicular cloud solution where different frequency bands are assigned to different transmission links to improve the network performance.
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Karlsson, Carl. "IMPULSIVE NOISE MODELING AND COEXISTENCE STUDY OF IEEE 802.11 AND BLUETOOTH". Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-308.

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This thesis describes the interference problem between IEEE 802.11 and Bluetooth. These well established communication standards are often used together simultaneously. Since both standards operate in the ISM-band at 2.45 GHz, they interfere with each other. In addition to this, interference from e.g. microwave ovens, heating processes, electric motors and cordless phones also occurs on the ISM-band. Due to this interference problem, a model has been developed in MATLAB to further investigate these interferences and the effects for the user.

The interference is modelled using the well known Class-A model for impulsive noise. The interference model is parameterized in the model and therefore the noise source(s) is described by a set of parameters derived from real measurements. Models for IEEE 802.11 legacy/b and Bluetooth are based on work published on the user community of MATHWORKS. To get a measure of performance, results from the model are presented as BER (Bit Error Rates) and PER (Packet Error Rates). When Bluetooth is used as a voice link, sound quality can also be performance evaluated directly by simply listening to a voice output file. To be able to track down a specific problem cause, measuring tools have also been included in the model to gain insight into what is causing bit/packet error.

A model describing the interference problem has been developed describing the real world usage of the standards by the use of state machines. Due to the complexity of the problem, and also for the model to be user friendly, this thesis is not composed of a thorough mathematical derivation describing BER probability for different modulation forms. The derivations for these has already been done and is therefore summarized and compared to when the model is validated. The model has been developed as a proof of concept for further work to fully support the current and coming IEEE standards for IEEE 802.11 and Bluetooth.

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4

Benaidja, Amira. "Echange d'informations en temps réel dans les réseaux de véhicules". Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCB045/document.

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Les réseaux véhiculaires, connus sous le terme VANETs, sont des réseaux impliquant des communications entre deux ou plusieurs véhicules et éventuellement une communication avec des éléments d’infrastructure sur la route. Récemment, le concept de systèmes de transport intelligents (STI) a connu beaucoup d’intérêt. Les STI sont des systèmes utilisant les nouvelles technologies de communication sans fil appliquées au domaine du transport pour améliorer la sécurité routière, la logistique et les services d’information. Des défis majeurs ont besoin cependant d'être abordés pour offrir une communication sur la route sécurisée et fiable dans des environnements anonymes et quelquefois hostiles à la communication. Comme dans tout système de communication, les réseaux véhiculaires doivent opérer en respectant des contraintes en termes de qualité de service. Ces contraintes sont d’autant plus strictes quand il s’agit de fournir des services de sécurité sur la route. Ce projet vise à développer des techniques de communication véhiculaires pour le transfert des informations de manière fiable entre véhicules roulant à grande vitesse tout en contrôlant la surcharge du réseau. Ces techniques visent la prise en compte des contraintes temporelles sur les délais de transfert afin d’envisager leur utilisation dans des applications critiques telle que la sécurité sur la route. Pour ce faire, cette thèse propose d’abord un protocole optimal de dissémination de messages d’urgence pour les VANETs. Il est basé sur une stratégie de diffusion qui exploite les véhicules sur la direction opposée afin d’accélérer la dissémination du message d’urgence tout en réduisant le nombre de transmissions. Ainsi, et dans le but d’assurer une dissémination fiable et à faible surcoût, une technique de retransmission périodique intelligente permettant l’adaptation du protocol proposé à différentes densités du trafic routier est proposée. Dans un second volet, ce projet propose une approche hybride de dissémination de messages d’urgence qui combine alternativement les avantages des deux principales approches de dissémination existantes (Sender-oriented et Receiver-oriented dont notre première proposition fait partie) afin de garantir une transmission fiable des alertes tout en réduisant les délais. Les approches Receiver-Oriented qui sont les plus adaptées pour les applications de sécurité dans les VANETs peuvent minimiser la latence et les limitations des approches Sender-Oriented. Mais, ilsdoivent aussi mieux exploiter les apports des messages hello (beacons) échangés dans la technologie IEEE802.11P. Ainsi, et dans le but de surmonter les limites des approches de retransmissions périodiques et celles de relais- multiples afin d’assurer des échanges fiables de messages de sécurité tout en réduisant la surcharge de la bande passante, nous introduisons un nouveau mécanisme DR/BDR (Designated Relay/Backup Designated Relay). Le BDR, dans ce mécanisme, doit remplacer le DR et assurer sa tâche quand il détecte, à travers les beacons colorés échangés,l’échec de ce dernier dans la dissémination du message d’urgence
Vehicular Ad hoc NETworks (VANETs) have gained considerable attention in the past few years due to their promising applications such as safety warning, transport efficiency or mobile infotainment. Avoiding accidents and traffic jams are two main immediate benefits of vehicular networks. For instance, most drivers would like to receive real-time alerts about accidents happening at a short distance in front of their vehicles since these accidents could lead to collision chains involving tens of vehicles. Also, the ability to receive an alert about a potential traffic jam would allow drivers to take alternate routes, saving both time and fuel. In both cases, warning messages should be broadcasted to all vehicles traveling over a geographical area, and need to be delivered with high reliability, low delay and low overhead. It is therefore important to develop a reliable and efficient safety information dissemination protocol in vehicular networks. Due to the vehicle mobility and lossy wireless channel, highly reliable, scalable and fast multi-hop broadcast protocol is very challenging to design. A number of solutions have been proposed in the past few years. However, the tradeoff between reliability and efficiency in such solutions needs to be carefully considered. This thesis presents an optimal protocol for the broadcast of safety messages in VANETs. Optimality, in terms of delay and transmission count, is achieved using a broadcast strategy that exploits opposite vehicles. To carry out reliable and efficient broadcast coordination, intelligent periodic rebroadcasts, which effectively adapt our protocol to sparse and dense networks, are proposed. Simulations are conducted and results are presented to show that it has a better performance over existing competing protocols. As a second contribution, we propose an alternative Receiver-Sender approach that combines advantages of the two existing dissemination approaches (Sender-oriented and Receiver-oriented to which our first proposal belongs) to ensure low latency and high reliability. The proposal can use any sender or receiver oriented protocol but the same selected one is used during all the dissemination process. In order to overcome the unreliability and broadcast overhead generated by periodic rebroadcasts and multiple relays schemes, we introduce a DR/BDR (Designated Relay/Backup Designated Relay) mechanism where the BDR has to replace the DR when detecting,from exchanged colored beacons, its failure in informing concerned vehicles
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5

Zhang, Lei. "Architecture et mecanismes de bout en bout pour les communications mobiles et sans fil dans l'internet". Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2009. http://tel.archives-ouvertes.fr/tel-00435868.

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La gestion performante de la mobilité et l'amélioration des performances des couches basses sont deux enjeux fondamentaux dans le contexte des réseaux sans fil. Cette thèse apporte des solutions originales et innovantes qui visent à répondre à ces deux problématiques empêchant à ce jour d'offrir des possibilités de communication performantes et sans couture aux usagers mobiles accédant à l'Internet via des réseaux d'accès locaux sans fil (WLAN). Ces solutions se distinguent en particulier par l'impact minimum qu'elles ont sur les protocoles standards de l'Internet (niveaux transport et réseau) ou de l'IEEE (niveaux physique et liaison de données). S'inscrivant dans les paradigmes de "bout en bout" et "cross-layer", notre architecture permet d'offrir des solutions efficaces pour la gestion de la mobilité : gestion de la localisation et des handover en particulier. En outre, nous montrons que notre approche permet également d'améliorer l'efficacité des transmissions ainsi que de résoudre efficacement plusieurs syndromes identifiés au sein de 802.11 tels que les anomalies de performance, l'iniquité entre les flux et l'absence de contrôle de débit entre la couche MAC et les couches supérieures. Cette thèse résout ces problèmes en combinant des modèles analytiques, des simulations et de réelles expérimentations. Ces mécanismes adaptatifs ont été développés et intégrés dans une architecture de communication qui fournit des services de communication à haute performance pour réseaux sans fils tels que WIFI et WIMAX.
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6

Hameed, Mohsin. "Performance Investigation of IEEE802 : 11e for Industrial Wireless Network". Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4250.

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The advantages of using IEEE 802.11-based Wireless Local Area Networks (WLAN) in industrial automation applications are substantial and include: mobility, ease and speed of installation, flexibility and costs. But wireless applications for industrial automation applications have rigorous requirements on quality of service (QoS) for the transmission of real-time critical process data. IEEE 802.11-based WLANs, which were initially designed only for best effort traffic, did not provide any QoS support for this kind of traffic. Therefore the IEEE 802.11e standard amendment was introduced and ratified in 2005. It defines the concept of a Hybrid Co-ordination Function (HCF) at the MAC layer for medium access control. HCF is a combination of HCF Controlled Channel Access (HCCA) with parameterized quality of service (QoS) and Enhanced Channel Access (EDCA) with prioritized QoS.

The contemporary work deals with the performance evaluation of HCCA for industrial wireless network. A HCCA simulation model has been implemented using OPNET modeler. The simulation results are compared with EDCA in terms of delays for various scenarios.

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Liu, Zuo. "Supporting VoIP in IEEE802.11 distributed WLANs". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/supporting-voip-in-ieee80211-distributed-wlans(1a6225c3-770e-4ce1-8fbb-b1e3f05534d2).html.

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Telecommunications is converging on the use of IP based networks. Due to the low cost of VoIP applications, they are being increasingly used instead of conventional telephony services. IEEE802.11 WLANs are already widely used both commercially and domestically. VoIP applications will also expand from usage over wired networks to voice communications over IEEE802.11 WLANs. This is known as VoWLAN. The use of VoWLAN may reach the maximum capacity of a wireless channel if there are many simultaneous VoIP calls operating close to each other. There is much published research based on a single IEEE802.11 infrastructure WLAN concluding that packet loss, transmission efficiency and latency issues are the major challenges limiting the VoWLAN capacity. The VoIP service quality will drop sharply when the demands exceed the WLAN’s capacity. This thesis demonstrates that these challenges also apply to distributed WLANs. To extend these findings from the existing research, the analysis in this thesis indicates that the capacity of a single IEEE802.11 WLAN channel is 12 VoIP calls. When the number of simultaneous VoIP calls is within the capacity, the WLAN can deliver more than 90% of the voice packets to the receiver within 150 ms (the lowest network performance for supporting acceptable VoIP service). However, as soon as the traffic loads are beyond the wireless channel capacity e.g. the number of simultaneous VoIP calls is greater than 13, the VoIP service quality catastrophically collapses. When the capacity is exceeded there are almost no voice packets that can be delivered to the receiver within 150 ms. Our research results indicate that the delay accumulation for voice packets in the transmitter’s outgoing buffer causes this problem. Our research also found that dropping ‘stale’ voice packets that are already late for delivery to the receiver can give more transmission opportunities to those voice packets that may still be delivered in time. This thesis presents a new strategy called Active Cleaning Queue (ACQ) which actively drops ‘stale’ voice packets from the outgoing buffer and prevents the accumulation of delay in congested conditions. When ACQ is applied in a saturated wireless channel the network performance for supporting VoIP traffic was found to gradually decrease proportional to the numbers of simultaneous VoIP calls rather than catastrophically collapse. There is also published research suggesting that the aggregation of packets can improve the efficiency of WLAN transmissions. An algorithm called Small Packet Aggregation for Wireless Networks (SPAWN) is also presented in this thesis to improve transmission efficiency of small voice packets in WLANs without introducing further delay to VoIP traffic. The evaluation result shows that after applying the SPAWN algorithm, the VoIP capacity of a single wireless channel can be extended up to 24 simultaneous calls.
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Olsson, Mattias. "A Rapid Prototype of an IEEE802.11a Synchronizer". Thesis, Linköping University, Department of Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1457.

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The first part of the thesis consists of a theoretical overview of OFDM, the effects of different imperfections like carrier frequency offset, timing offset and phase noise followed by a short overview of the IEEE802.11a standard for WLAN. The second part consists of an overview of a number of different techniques for synchronization that have been published. A technique based on correlation in the time domain is chosen and implemented as a floaing-point model and later as a fixed-point model using Matlab, Simulink and Xilinx System Generator. The fixed-point model is then synthesized to an FPGA to verify that the design flow works and that a required clock frequency can be achieved.

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Bergamo, Pierpaolo, Daniela Maniezzo, Kung Yao, Matteo Cesana, Giovanni Pau, Mario Gerla y Don Whiteman. "IEEE802.11 WIRELESS NETWORK UNDER AGGRESSIVE MOBILITY SCENARIOS". International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605385.

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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada
Wireless LAN (WLAN) has been extensively deployed in commercial, scientific and home applications due to the availability of low-cost wireless Network lnterace Cards (NICs) based on the IEEE802.11 standard. The purpose of this work is to study experimentally the behavior of an IEEE802.11 wireless network when the nodes arc characterized by mobility up to the speed of 240 km/h. This study leads to the understanding of the survivability and the performance of a connection under various aggressive mobility conditions. These studies may be adapted for data telemetry from mobile airborne nodes to fixed networks or between airborne nodes.
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Edbom, Emil y Henrik Henriksson. "Design comparison between HiperLAN/2 and IEEE802.11a services". Thesis, Linköping University, Department of Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1358.

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This paper is a study and comparison between the two Wireless LAN (WLAN) standards HiperLAN/2 and IEEE 802.11a. WLANs are used instead or together with ordinary LANs to increase mobility in for example an office. HiperLAN/2 is an European standard developed by ETSI and the IEEEs standard is American.

A WLAN-card consists roughly of a Medium Access Control (MAC), Physichal layer (PHY) and an antenna. The antenna is the same for the different standards.

Both standards operates at 5.4 GHz with a maximum transmission rate at 54 Mbit/s and they use OFDM to modulate the signal. This means that the physical layer in the two standards is similar.

The differences between the standards are in the Medium Access Control (MAC) layer. HiperLAN/2 has a much more complex MAC since it is developed with the starting point in cellular phones. Therefore this MAC is not very similar to ETHERNET that is the protocol used by regular network. On the other hand it is built to be compatible with cellular phones and other applications.

The 802.11a MAC is very much the same as in the 802.11b standard that is the most used standard at present. The difference is that 802.11a can send at much higher data rates. This MAC is build with starting point in ETHERNET so it has a similar interface to the computer. This makes it less complex.

The different MACs can provide different services. The greatest difference is that 802.11a can use a distributed send mode where any STA can send if the medium is idle. This reminds a lot of ETHERNET but they use different methods to sense if the medium is idle. In HiperLAN/2 are all transmissions scheduled by the AP. 802.11a can operate in a similar way but at the moment this mode is not as fully developed as in HiperLAN/2. There are working groups in IEEE that works toward an improvement of 802.11a so it can use queues with different priorities, this is already implemented in HiperLAN/2.

Another important issue in wireless environment is security. Both standards use encryption to protect their messages. The difference is that HiperLAN/2 changes their encryption key for every connection where 802.11a uses the same key the whole time. This gives HiperLAN/2 a better security with todays standard but thereare working groups dealing with implementing key-exchange functions and Kerberos use in 802.11a. Chapter 8 is a description of a program that we developed in C++. The program is used to monitor the different registers and ports a WLAN-card use. It is written for a 802.11b card and should be used together with Windows 2000. The source code can be found in appendix C.

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Libros sobre el tema "IEEE802.11p"

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Yŏn'guwŏn, Han'guk Chŏnja T'ongsin. 200Mbps-kŭp IEEE802.11n modem mit RF ch'ipset kaebal =: Development of IEEE802.11n modem and RF chip-sets with data rate 200Mbps. [Kyŏnggi-do Kwach'ŏn-si]: Chisik Kyŏngjebu, 2009.

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Capítulos de libros sobre el tema "IEEE802.11p"

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V.P., Harigovindan, A. V. Babu y Lillykutty Jacob. "Bit-Based Fairness in IEEE802.11p MAC for Vehicle-to-Infrastructure Networks". En Lecture Notes in Computer Science, 328–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29280-4_39.

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Sikora, Axel, Manuel Schappacher y Lars Möllendorf. "Automated RF Emulator for a Highly Scalable IEEE802.11p Communication and Localization Subsystem". En Lecture Notes in Computer Science, 11–22. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06644-8_2.

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Husain, Akhtar y S. C. Sharma. "Performance Analysis of Location and Distance Based Routing Protocols in VANET with IEEE802.11p". En Proceedings of 3rd International Conference on Advanced Computing, Networking and Informatics, 215–21. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2529-4_22.

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Fang Yi, Leu y Chang Chia Wen. "Enhancing UORA for IEEE802.11be". En Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 69–82. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55976-1_7.

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Nascimento, Alberto y Jonathan Rodriguez. "Dynamic Resource Allocation for IEEE802.16e". En Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 147–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03819-8_15.

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Lee, Jong-hu y Jae-cheol Ryou. "Strong User Authentication in IEEE802.11 Wireless LAN". En Web and Communication Technologies and Internet-Related Social Issues — HSI 2003, 638–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-45036-x_68.

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Krishnam Raju, K. V. y V. Valli Kumari. "Formal Verification of IEEE802.11i WPA-GPG Authentication Protocol". En Information Technology and Mobile Communication, 267–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20573-6_44.

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Al-Tarawneh, Luae’ A. "Medical Grade QoS Improvement Using IEEE802.11e WLAN Protocol". En Smart Technologies and Innovation for a Sustainable Future, 229–35. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01659-3_26.

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Krishnam Raju, K. V., V. Valli Kumari, N. Sandeep Varma y K. V. S. V. N. Raju. "Formal Verification of IEEE802.16m PKMv3 Protocol Using CasperFDR". En Information and Communication Technologies, 590–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15766-0_101.

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Rademacher, Michael, Mathias Kretschmer y Karl Jonas. "Exploiting IEEE802.11n MIMO Technology for Cost-Effective Broadband Back-Hauling". En Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 1–11. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08368-1_1.

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Actas de conferencias sobre el tema "IEEE802.11p"

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Bloessl, Bastian, Mario Gerla y Falko Dressler. "IEEE802.11p in fast fading scenarios". En the First ACM International Workshop. New York, New York, USA: ACM Press, 2016. http://dx.doi.org/10.1145/2980100.2980104.

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Patel, Maulik y Vijay Ukani. "Optimized handoff process in IEEE802.11p based VANET". En 2012 1st International Conference on Emerging Technology Trends in Electronics, Communication and Networking (ET2ECN). IEEE, 2012. http://dx.doi.org/10.1109/et2ecn.2012.6470119.

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Silva, Joao Nuno y Joao Nuno Matos. "Design of a Power Amplifier for IEEE802.11p applications". En IEEE EUROCON 2015 - International Conference on Computer as a Tool (EUROCON). IEEE, 2015. http://dx.doi.org/10.1109/eurocon.2015.7313748.

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Yang, Yan. "Inter-Vehicle Cooperative Channel Estimation for IEEE802.11p Systems". En 2016 IEEE 83rd Vehicular Technology Conference (VTC Spring). IEEE, 2016. http://dx.doi.org/10.1109/vtcspring.2016.7504299.

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Poochaya, Settawit, Peerapong Uthansakul y Monthippa Uthansakul. "Performance evaluation on using IEEE802.11p for indoor DSRC approach". En 2012 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2012. http://dx.doi.org/10.1109/apcap.2012.6333199.

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Santamaria, Amilcare Francesco, Cesare Sottile, Andrea Lupia y Pierfrancesco Raimondo. "An efficient traffic management protocol based on IEEE802.11p standard". En 2014 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS). IEEE, 2014. http://dx.doi.org/10.1109/spects.2014.6880004.

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Hu, Lin, Thomas Kaiser, Claus Kupferschmidt, Hieu Nguyen y Huang Jing. "A study of the key technology of IEEE802.11p-2010". En 2011 International Conference on Graphic and Image Processing. SPIE, 2011. http://dx.doi.org/10.1117/12.913563.

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Bourdoux, A., H. Cappelle y A. Dejonghe. "Channel Tracking for Fast Time-Varying Channels in IEEE802.11p Systems". En 2011 IEEE Global Communications Conference (GLOBECOM 2011). IEEE, 2011. http://dx.doi.org/10.1109/glocom.2011.6134024.

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Ping Wang, Fei Wang, Yusheng Ji, Fuqiang Liu y Xinhong Wang. "Performance analysis of EDCA with strict priorities broadcast in IEEE802.11p VANETs". En 2014 International Conference on Computing, Networking and Communications (ICNC). IEEE, 2014. http://dx.doi.org/10.1109/iccnc.2014.6785368.

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Stoica, Razvan-Andrei, Stefano Severi y Giuseppe Thadeu Freitas de Abreu. "On prototyping IEEE802.11p channel estimators in real-world environments using GNURadio". En 2016 IEEE Intelligent Vehicles Symposium (IV). IEEE, 2016. http://dx.doi.org/10.1109/ivs.2016.7535356.

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