Assisting V2V failure recovery using Device-to-Device Communications

This paper aims to propose a new solution for failure recovery (dead-ends) in Vehicle to Vehicle (V2V) communications through LTE-assisted Device-to-Device communications (D2D). Based on the enhanced networking capabilities offered by Intelligent Transportation Systems (ITS) architecture, our solution can efficiently assist V2V communications in failure recovery situations. We also derive an analytical model to evaluate generic V2V routing recovery failures. Moreover, the proposed hybrid model is simulated and compared to the generic model under different constrains of worst and best cases of D2D discovery and communication. According to our comparison and simulation results, the hybrid model decreases the delay for alarm message propagation to the destination (typically the Traffic Control Center TCC) through the Road Side Unit (RSU)Comment: 3 page

A Hybrid Model to Extend Vehicular Intercommunication V2V through D2D Architecture

In the recent years, many solutions for Vehicle to Vehicle (V2V) communication were proposed to overcome failure problems (also known as dead ends). This paper proposes a novel framework for V2V failure recovery using Device-to-Device (D2D) communications. Based on the unified Intelligent Transportation Systems (ITS) architecture, LTE-based D2D mechanisms can improve V2V dead ends failure recovery delays. This new paradigm of hybrid V2V-D2D communications overcomes the limitations of traditional V2V routing techniques. According to NS2 simulation results, the proposed hybrid model decreases the end to end delay (E2E) of messages delivery. A complete comparison of different D2D use cases (best & worst scenarios) is presented to show the enhancements brought by our solution compared to traditional V2V techniques.Comment: 6 page

Surveying Position Based Routing Protocols for Wireless Sensor and Ad-hoc Networks

A focus of the scientific community is to design network oriented position-based routing protocols and this has resulted in a very high number of algorithms, different in approach and performance and each suited only to particular applications. However, though numerous, very few position-based algorithms have actually been adopted for commercial purposes. This article is a survey of almost 50 position-based routing protocols and it comes as an aid in the implementation of this type of routing in various applications which may need to consider the advantages and pitfalls of position-based routing. An emphasis is made on geographic routing, whose notion is clarified as a more restrictive and more efficient type of position-based routing. The protocols are therefore divided into geographic and non-geographic routing protocols and each is characterized according to a number of network design issues and presented in a comparative manner from multiple points of view. The main requirements of current general applications are also studied and, depending on these, the survey proposes a number of protocols for use in particular application areas. This aims to help both researchers and potential users assess and choose the protocol best suited to their interest

Array communications in wireless sensor networks

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Kablosuz algılayıcı ağlar için öncelik tabanlı yeni bir yönlendirme protokolü tasarımı ve başarım analizi

06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır.Gelişen teknolojiyle birlikte boyutu küçük ve hata oranı düşük, işlem gücü ve iletim becerileri yüksek, üzerinde birden fazla algılayıcı barındırabilen uygun fiyatlı algılayıcı düğümler tasarlanabilmektedir. Algılama, hesaplama ve iletim yapabilen yüzlerce hatta binlerce algılayıcı düğüm bir araya gelerek kablosuz algılayıcı ağları oluşturur. Kablosuz algılayıcı ağlar düşük maliyetli ve çok işlevsel düğümlerden oluştuklarından genelde ulaşılması güç ve geniş alana sahip bölgelerde yapılan uygulamalarda öne çıkmaktadır. Enerji kaynakları sınırlı olan düğümlerin, bakım veya düzenleme yapılmaksızın uzun süre algılama ve iletim yapabilmeleri önemlidir. Kablosuz algılayıcı ağların en önemli problemlerinden birisi yönlendirmedir. Kendine özgü karakteristiklerinden dolayı kablosuz algılayıcı ağlara özel protokoller tasarlanması gerekmektedir. Yüzlerce düğümden oluşan kablosuz algılayıcı ağlar, birim zamanda çok fazla sayıda veri üretirler. Büyük miktarda üretilen verinin iletilmesi esnasında oluşacak tıkanıklık gibi durumlardan dolayı önemsiz veriler alıcıya teslim edilirken daha önemli verilerin alıcıya zamanında ya da hiç ulaştırılamaması ciddi bir problemdir. Yüksek öncelikli veriler yüksek paket teslim oranı ve beklenen düşük gecikme ile iletilemediğinde, doğal felaketler gibi acil tedbir üretilmesi gereken uygulamalarda hem maddi hem de manevi kayıplar yaşanır. Bu tez çalışmasında, kablosuz algılayıcı ağlarda veri önceliği kaynak düğüm tarafından belirlenen, yüksek öncelikli verilere daha iyi hizmet sağlarken tüm verilerin alıcıya teslim edilmesini hedefleyen “İşaretsiz Öncelik Tabanlı Yönlendirme – PBBR” (Priority Beaconless Based Routing) adı verilen yeni bir yönlendirme protokolü tasarlanmıştır. Tasarlanan “PBBR” protokolünün “Omnet++” benzetim aracı kullanılarak başarımı incelenmiştir. “PBBR” protokolü yönlendirme ek yükü, paket teslim oranı ve uçtan uca ortalama paket gecikmesi açısından yüksek başarım elde etmektedir. Bunlar dışında “PBBR” protokolü daha az bellek kapasitesi kullanmakta, veri üretilen sahanın genişliğini daha uzun süre korumakta ve her bölgeden veriyi hedef alıcıya ulaştırmaktadır. SUMMARYBy means of developing technology, it is possible to design sensor nodes with suitable prices, in small sizes, with low fault rates, containing more than one sensor and with high processing and transmitting capabilities. Wireless networks are built through thousands of combined sensor nodes which can sense, calculate and transmit. As wireless sensor networks are low cost and composed of multi-functional nodes, they are usually used in wide regions where access is difficult. It is important that they are able to sense and transmit for a long time without having any maintenance or adjustment with limited energy sources. One of the most important problems of wireless sensor networks is routing problem. Special protocols for the wireless sensor networks are required to be designed because of its own characteristics. Wireless sensor networks consisted of hundreds of nodes generate a great deal of data at a unit time. Because of situations like blockage while transmitting the huge generated data, not being able to deliver more important data in time or unable to deliver the data at all may emerge as a serious problem while insignificant data are delivered to the receiver. When high priority data with high packet delivery rates and the low expected delay cannot be transmitted, both material and spiritual losses are experienced in cases such as natural disasters which need urgent measures. In this thesis, a new routing protocol PBBR” (Priority Beaconless Based Routing) was designed which was determined by the source node wireless sensor networks and aimed delivering all data to the receiver as well as providing a better service for high priority data. The performance of the designed "PBBR" protocol was analyzed by simulation tool “Omnet ++”. PBBR protocol gives much better results according to routing additional load, packet delivery rate and end to end average packet delay. In addition to these, "PBBR" protocol uses less memory capacity, maintains the width of the area where the data are generated for a longer period and transmits data from each region to the target receiver