A flexible medium access control framework for multimedia application support in wireless ATM

Includes bibliographical references.The field of wireless communications has seen phenomenal development over the last decade. With the current abundance of applications that use broadband multimedia over wired networks it is logical that users will want to have access to these same multimedia streams [rom a mobile terminal. Wireless solutions for connectivity to networks such as Ethernet networks already exist, however, a method of supporting access to an ATM network from a mobile terminal has not yet been standardised. Transporting ATM data over the wireless medium poses a number of problems. The Medium Access Control (MAC) layer of any proposed wireless ATM network would be responsible for resolving many of these problems. Unfortunately, research into MAC layers is hampered by the fact that most existing MAC layers cannot be modified in order to experiment with the effectiveness of the many MAC protocol techniques that exist

Adaptive reservation TDMA protocol for wireless multimedia traffic

An Adaptive Reservation Time Division Multiple Access (AR-TDMA) control protocol for Wireless Asynchronous Transfer Mode (WATM) networks is proposed in this paper. AR-TDMA combines the advantages of distributed access and centralised control for transporting Constant Bit Rate (CBR), Variable Bit Rate (VBR) and Available Bit Rate (ABR) traffic efficiently over a wireless channel. The contention slots access for reservation requests is governed by two protocols, the Adaptive Framed Pseudo-Bayesian Aloha with Adaptive Slot Assignment (AFPBAASA) protocol and the Framed Pseudo-Bayesian Aloha with Adaptively Prioritised Controlled Capture (FPBAAPCC) protocol. Both protocols provide different access priorities to the control packets in order to improve the Quality-of-Service (QoS) offered to time sensitive connections. AR-TDMA also features a novel integrated resource allocation algorithm that efficiently schedules terminals’ reserved access to the wireless ATM channel by considering their requested bandwidth and QoS. Integration of CBR, voice, VBR, data and control traffic over the wireless ATM channel using the proposed AR-TDMA protocol is considered in the paper. The performance of the AR-TDMA in conjunction with the AFPBA-ASA protocol and FPBA-APCC protocol has been investigated and the simulation results are presented showing that the protocol satisfies the required QoS of each traffic category while providing a highly efficient utilisation of approximately 96% for the wireless ATM channel

Design and performance evaluation of Wireless Multi-Protocol Label Switching (WMPLS)

Scope and Method of Study: The research presented in this document focuses on the design of a new protocol for high-speed wireless data communications. The primary goal of this new design is to overcome the limitations of its predecessors, while minimizing the needed resources and maximizing throughput and efficiency in its operations. Another important goal of the study is to provide a homogeneous protocol for wired and wireless networks in order to provide complete interoperability for overlay models and other protocols that can be designed on the basis of this work. The performance evaluation part of this document shows the areas in which improvement has been achieved over previous protocol implementations, and it also shows the areas in which further research is needed in order to improve the performance at least to the levels set by previous protocols.Findings and Conclusions: This study shows that a native wireless design and implementation of the Multi-Protocol Label Switching (MPLS) protocol provides improvements in the field of wireless data communications, providing a homogeneous platform for voice and data communication networks. The research is open for further improvements and modifications for services not contemplated in this document, and continuous developments should be conducted in order to obtain a working prototype of this proposal

Bulloch Times (Statesboro News-Statesboro Eagle)

https://digitalcommons.georgiasouthern.edu/bulloch-news-issues/3024/thumbnail.jp

Esnek üretim sisteminin gerçek zamanlı uzaktan erişimli kontrolü ve mekatronik eğitimine uygulanması

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.Son yıllarda elektrik-elektronik, bilgisayar ve kontrol sistemlerinde çok büyük gelişmeler yaşanmaktadır. Elektrik-elektronik, pnömatik-hidrolik, bilgisayar ve mekanik teknolojilerinin birlikte kullanılması neredeyse bir zorunluluk haline gelmiştir. Bunun sonucu olarak çok geniş bir alanı kapsayan mekatronik yeni bir mühendislik disiplini olarak ortaya çıkmıştır. Günümüzde sadece mekanik veya sadece elektronik ürünler neredeyse hiç bulunmamaktadır. Bu etkili değişiklikten dolayı günümüzün mühendislik eğitiminde de önemli gelişmeler yaşanmaktadır. Bu bağlamda mekatronik sistemler ve eğitimi oldukça önem kazanmıştır. Teorik bilgilerin pekiştirilmesi ve teoriyle uygulama arasındaki uyum derecesinin gösterilebilmesi amacıyla mühendislik eğitiminin değişik bölümlerinde ilgili dersler kapsamında veya bağımsız bir ders olarak laboratuvar uygulamalarına yer verilmesi gerekmektedir. Verilen eğitimin hedefine ulaşabilmesi için teorik bilginin yanında bu bilgilerin gerçek sistemler üzerinde de uygulanarak pekiştirilmesi gerekmektedir. Mekatronik eğitiminde kullanılmak amacıyla Festo Didaktik firması tarafından üretilen Esnek Üretim Sistemi; mekanik, elektrik, elektronik, sensörler, hareket elemanları, pnömatik ve robot teknolojileri gibi birçok disiplinlerarası mühendislik uygulama konusunu kapsamaktadır. Fakat bu deney seti, mevcut haliyle lisans düzeyindeki bir öğrenci bakışıyla çok karmaşık bir mekanik ve kontrol algoritmasına sahip olarak görülmektedir. Bu nedenle sistem mevcut haliyle öğrenci müdahalesinden uzak, sadece gösterim amaçlı olarak kullanılabilmektedir. Bu tez çalışmasında, mevcut Esnek Üretim Sistemi'nin mekanik ve elektriksel yapısı değiştirilmeden sisteme ilave olarak elektronik ve kontrol sistemi için yeni tasarımlar yapılmıştır. Böylece, deney seti temel düzeydeki öğrencilerin de mekatronik sistemler konusunda en yüksek derecede fayda sağlayabileceği ve kapsadığı teknolojik konuların uygulamalarını kolayca gerçekleştirebileceği bir yapıya kavuşturulmuştur. Bu amaçla, Esnek Üretim Sistemi istasyonlarının kontrollerini sağlamak amacıyla mikrokontrolör tabanlı elektronik kartlar tasarlanmıştır. Bu sayede, mekatronik sistemlerde önemli bir yere sahip olan mikrokontrolörler ile gerçek bir sistem üzerinde uygulama yapma imkânı sağlanmıştır. Sistemin kendi donanımı ve istasyonları arası haberleşmeyi sağlamak amacıyla CAN ağı kurulmuştur. İstasyonları CAN ağı üzerinden programlamak, dağıtık kontrol uygulamaları geliştirmek ve sistem için anlık durum izleme amacıyla LabVIEW tabanlı kullanıcı arayüzleri tasarlanmıştır. Ayrıca bazı istasyonların web ortamında uzaktan programlanabilmesi imkanı da sağlanmıştır.In recent years, great developments have been experienced in electric-electronic, computer and control systems. Using of electric-electronic, pneumatic-hydraulic, computer and mechanic technologies together has become an obligation. Consequently, the mechatronics that covers a very wide area has appeared as a new discipline. Today, neither mechanic nor electronic products are almost not available alone. Because of this effective change, very important developments have been experienced in the engineering education of today. With this regard, mechatronics systems and education has gained a great deal of importance. One of the most important phases of the engineering education is undoubtedly the laboratory applications. For a productive education, the courses must be given both theoretically and practically by being applied on real systems. In this study made for purpose of giving an applied and detailed mechatronics education, with the changes made on the electronic and control system by using the mechanical structure of the flexible manufacturing system manufactured by the Festo Company, a structure that the students can get the highest degree of benefit from the system and understand the principles of technological subjects it covers has been established. However, this experiment set, in its current situation, seems having a very complex mechanic and control algorithm in view of an undergraduate student. For this reason, the system can only be used for purpose of demonstration far from intervention of a student. In this study, new designs have been developed for the electric and control system without making any modification in the mechanic structure of the system. In this manner, the experiment set, with its current structure, college students will be benefited by the highest rate in mechatronics subject and applications of the technological subjects in covers will be easily realized. Therefore microcontroller based controlling stations of the flexible manufacturing system cards have been designed. In this way, the application opportunity on a real system with microcontrollers which have an important role in mechatronics systems has been ensured. CAN bus protocol has been set up to ensure communication between the stations and hardware of the system. LabVIEW graphical programming based user interfaces have been designed to program stations via network, develop distributed control applications and online monitoring the status for the system. In addition these, as a very important development of this study, web based programming of some certain FMS stations has been realized. Hence users of the experiment set-up can be adapt own programs to the system

WiMAX (IEEE 802.16)-profıbus arabağlaşım elemanının petri ağlarla modellenmesi ve performans 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.Endüstriyel kontrol uygulamalarında saha seviyesindeki dağıtık kontrolör cihazların haberleşmesinde sahayolu ağları kullanılmaktadır. PROFIBUS (PROcess FIeld BUS) uluslararası standartlarla (IEC61158, EN50170) tanımlanmış en popüler sahayoludur. Üretim (fabrika), süreç ve bina otomasyon uygulamalarında yaygın olarak kullanılan PROFIBUS, 100 m ile 1200 m mesafede 9.6 kbps ile 12 Mbps arasındaki iletişim hızlarını desteklemektedir. Bu durum, PROFIBUS'ın daha geniş kapsama alanları ve yüksek hızlarda kullanılabilmesi için omurga teknolojisine sahip arabağlaşım elemanlarının kullanımını gerektirir.Arabağlaşım için kullanılan omurga protokolü gereksinimleri gelişen teknolojilerle birlikte değişmektedir. Günümüzde, kurulum kolaylığı ve hareketlilik avantajlarından dolayı kablolu omurga çözümlerine karşılık, kablosuz omurga çözümleri de kullanılmaya başlanmış ve hızla yaygınlaşmaktadır. Kablosuz genişbant omurga teknolojisi olan IEEE 802.16-WiMAX, görüş hattında 50 km'lik bir kapsama alanı, 120 Mbps veri transfer hızı ve farklı servis sınıflarında (UGS, rtPS, nrtPS, BE, ErtPS) hizmet kalitesi sunan bir protokoldür.Bu çalışmada, farklı lokasyonlardaki PROFIBUS segmentlerini IEEE 802.16-WiMAX kablosuz omurga teknolojisi üzerinden UGS servis sınıfı kullanarak birbirine bağlayan bir arabağlaşım birimi önerilmektedir. Bu birimin, senkronizasyon, koşutzamanlılık, kilitlenmeyi önleyebilme, üstel dağılım ve sabit zaman gecikme özellikleri olan Genelleştirilmiş Stokastik Petri Ağlar modeli sunulmaktadır. Ayrıca, model içerisinde PROFIBUS paketlerinin IEEE 802.16 paketleri içerisine kapsüllendiği önerilmektedir.Tasarlanan PROFIBUS/IEEE 802.16-WiMAX arabağlaşım birimi, geçit çıkış tampon boyutu, geçit giriş tampon boyutu, master istasyon jeton tutma süresi ve geçit PROFIBUS ayağı jeton tutma süresi parametrelerine bakılarak değerlendirilmiştir. Benzetimlerden alınan sonuçlar, arabağlaşım biriminin, farklı yükler altında yeterli bir hizmet sağladığını ve fiziksel gerçeklemesini yapacak olan kişiler için de başarımı ölçülebilir bir tasarım modeli sunduğunu göstermektedir.In the application of industrial controlling, fieldbuses are used in the communication of distributed controller devices at field layer. PROFIBUS (PROcess FIeld BUS) which is defined with the international standards (IEC61158, EN50170) is the most popular fieldbus. PROFIBUS which is used frequently in manufacturing (factory), process and building automations, provides datarates from 9.6 kbps to 12 Mbps at distance from 100 to 1200 meters. This situation requires using of internetworking units which has backbone technology, for using PROFIBUS at more coverage area and high datarates.The requirements of a backbone protocol used for internetworking, are changed by the development in technology. Nowadays, because of advantages of easiness in installation and mobility, in addition to the wired backbone solutions, wireless backbone solutions began to be used and rapidly became common. As a wireless broadband backbone technology, IEEE 802.16-WiMAX is a protocol that can serve a 50 km coverage area, a 120 Mbps datarate and a QoS at different service classes (UGS, rtPS, nrtPS, BE, ErtPS) in line-of-sight.In this study, an internetworking unit is proposed that interconnects PROFIBUS segments placed at different locations through a wireless backbone technology of IEEE 802.16-WiMAX by using UGS service class. By the features of synchronization, concurrent, deadlock avoidance, exponential distribution and constant time delay, Generalized Stochastic Petri Nets model of the unit is done. Also in the model, it is proposed that PROFIBUS packets are encapsulated into IEEE 802.16 packets.The designed PROFIBUS/IEEE 802.16-WiMAX internetworking unit is analyzed according to gateway output buffer size, gateway input buffer size, master station token holding time and gateway PROFIBUS side token holding time parameters. The outputs of simulations show that internetworking unit can support a sufficient service under different loads and present a designed model with a measurable performance for the people who want to implement it physically

Multiservice Ethernet Digital Distributed Antenna Systems

Over 90% of wireless communications traffic occurs indoors and in-building wireless coverage is still one of the biggest obstacles for wireless users. As the growing demands on wireless capacity, coverage and connectivity have led to 4G and 5G standards, it has also become increasingly important to design and implement future-proof indoor wireless services in a cost effective manner. This thesis introduces a novel multi-service digital distributed antenna systems (DDAS) for indoor wireless coverage, which not only is able to transport multiple wireless carriers from different vendors and mobile operators, but also allows a converged architecture to integrate indoor wireless system with existing Ethernet infrastructures. The Cloud Radio Access Networks (C-RAN) has been suggested by major telecom vendors as the main architecture for last-mile coverage in 5G. However, the digital fronthaul interface defined in common public radio interface (CPRI), which is most widely adopted standard for C-RAN, requires very expensive infrastructures to be built due to the high data rate generated after digitisation. A solution has been introduced at the University of Cambridge previously to remove the digital redundancy by using a data compression technique which has shown 3-times higher transmission efficiency than CPRI. This thesis extends the concept to a more robust architecture allowing multiple wireless services to be transmitted simultaneously as well as being carried over standard Ethernet without losing the Quality of End-user Experience (QoE) and the Quality of Service (QoS) of in-building mobile network. A two-channel DDAS system with data compression algorithm is experimentally demonstrated, showing wide RF dynamic range for both 4G LTE service and 3G WCDMA service simultaneously carried over a single fibre-based infrastructure. The system leads to the design and implementation of full-service DDAS system allowing 14 channels (all 2/3/4G service from three major mobile operators) to be carried over single 10Gbps network. Typically, the system using CPRI will need over 30Gbps network to be installed for wireless coverage. Another key aspect covered in this thesis is the design and implementation of the multi-service DDAS over Ethernet (Eth-DDAS). Due to the stringent latency requirement in wireless services, mitigation of delays and errors in frame ordering has become a key challenge for putting DDAS over Ethernet. To overcome these problems, a special Eth-DDAS frame structure is proposed in this thesis. After digitisation, digital signal bearing RF information is packetised onto Ethernet-compatible frames with additional timestamps and sequence numbers before transported via fibre to the receiver. Three latency scenarios are tested with different payload sizes of the proposed frame structure and real-time RF performance is measured to prove the capability of implementation of such system in real-life using commercial off-the-shelf (COTS) ADC/DAC and FPGAs

Winona Daily News

https://openriver.winona.edu/winonadailynews/2316/thumbnail.jp

Topographical memoir and report of Captain T. J. Cram, on Territories of Oregon and Washington

Topographical Memoir of the War Dept. of the Pacific. [1014] Military operations during the Indian war of 1855-1856 in Washington and Oregon; treaties negotiated, and their effects