1,721,000 research outputs found
Mobility management in next generation wireless metropolitan area networks:Master's thesis
No full textThe next generation of wireless access technologies cannot succeed by providing either high data rates or full mobility support. Instead, it will be required to provide both broadband connectivity and support for full mobility. Worldwide Interoperability for Microwave Access (WiMAX) and High Speed Packet Access (HSPA) are two upcoming technologies, which can live up to these high expectations. In this master's thesis, WiMAX and HSPA are reviewed, paying special attention to mobility management issues and support for modern mixed multimedia traffic. In order to observe the real performance of currently available commercial equipment under such traffic conditions, measurement results from a WiMAX testbed are provided. These results show that even with rudimentary fixed WiMAX equipment, the effective capacity of the wireless link is substantially higher than that of the wireless access technologies currently dominating the markets. Wireless access technologies often need assistance from network layer protocols, in order to deliver full mobility support at the system level. In WiMAX, the Mobile Internet Protocol (MIP) is used for network layer mobility management. This master's thesis overviews different MIP variants, including the Mobile Internet Protocol Version 6 (MIPv6), which is reviewed in detail. The handover latencies of the MIPv6 are also studied using a testbed. The measurement results show that in order for the MIPv6 to handle network layer mobility management in a satisfactory manner, all the wireless networks involved in a handover must be carefully configured
The proceedings of Testing Solutions for 4G Radio Access Technologies Seminar
No full textEnsuring the quality and correctness of complex system such 3G Long Term Evolution LTE sets major challenges for the effi ciency of the testing activities. Testing is needed to be carried out in multiple phas-es from early phase unit testing towards system and acceptance testing of overall system, each phase typi-cally needing different set of test tools, scripts and environments. As the implementation of a particular unit (e.g., protocol layer) is often also dependent on other units that may not be available during early phase testing, a great amount of environment simulations are also needed to facilitate the testing. In addi-tion, with development of embedded system such LTE base station, the target hardware may not be avail-able in early phase testing, requiring execution of tests in simulated target environment. The seminar focuses on results of the CrossNet project, which is a crosslayer network support function and optimization research and development project for evolving broadband wireless access standards. The goal is to connect the existing physical layer simulation and hardware emulation models to the high layer network emulators and testers. This provides opportunities for network testing equipment development and network protocol crosslayer optimization in practical networks and products
The proceedings of Testing Solutions for 4G Radio Access Technologies Seminar
No full textEnsuring the quality and correctness of complex system such 3G Long Term Evolution LTE sets major challenges for the effi ciency of the testing activities. Testing is needed to be carried out in multiple phas-es from early phase unit testing towards system and acceptance testing of overall system, each phase typi-cally needing different set of test tools, scripts and environments. As the implementation of a particular unit (e.g., protocol layer) is often also dependent on other units that may not be available during early phase testing, a great amount of environment simulations are also needed to facilitate the testing. In addi-tion, with development of embedded system such LTE base station, the target hardware may not be avail-able in early phase testing, requiring execution of tests in simulated target environment. The seminar focuses on results of the CrossNet project, which is a crosslayer network support function and optimization research and development project for evolving broadband wireless access standards. The goal is to connect the existing physical layer simulation and hardware emulation models to the high layer network emulators and testers. This provides opportunities for network testing equipment development and network protocol crosslayer optimization in practical networks and products
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Transport Use Case Trials of 5G-HEART Project
Full text link5G-HEART (5G HEalth AquacultuRe and Transport validation trials) project focuses on realising 5G trials and validating 5G Key Performance Indicators (KPIs) on the vital vertical use-cases of healthcare, transport and aquaculture. In the health area, 5G-HEART validates pillcams for automatic detection in screening of colon cancer and vital-sign patches with advanced geo-localization as well as 5G Augmented/Virtual Reality (AR/VR) paramedic services. In the transport area, 5G-HEART validates autonomous/ assisted/ remote driving and vehicle data services. In the aquaculture area, 5G-HEART validates 5G-based fish farm monitoring systems. Among them, transport sector connected with fifth generation (5G) mobile communications systems will drive transformational changes while bringing social, economic and industrial benefits to the economies that take the lead in its adoption. 5G-enabled industry digitisation for automotive and public transport represents 10% and 8% of the overall $1.3T market in 2026, respectively. In this paper, transport use case trials of 5G-HEART project are introduced
Transport Use Case Trials of 5G-HEART Project
No full text5G-HEART (5G HEalth AquacultuRe and Transport validation trials) project focuses on realising 5G trials and validating 5G Key Performance Indicators (KPIs) on the vital vertical use-cases of healthcare, transport and aquaculture. In the health area, 5G-HEART validates pillcams for automatic detection in screening of colon cancer and vital-sign patches with advanced geo-localization as well as 5G Augmented/Virtual Reality (AR/VR) paramedic services. In the transport area, 5G-HEART validates autonomous/ assisted/ remote driving and vehicle data services. In the aquaculture area, 5G-HEART validates 5G-based fish farm monitoring systems. Among them, transport sector connected with fifth generation (5G) mobile communications systems will drive transformational changes while bringing social, economic and industrial benefits to the economies that take the lead in its adoption. 5G-enabled industry digitisation for automotive and public transport represents 10% and 8% of the overall $1.3T market in 2026, respectively. In this paper, transport use case trials of 5G-HEART project are introduced
Mobile WiMAX
No full textOne of the technologies that can lay the foundation for the next generation (fourth generation [4G]) of mobile broadband networks is popularly known as “WiMAX.” WiMAX, Worldwide Interoperability for Micro wave Access, is de-signed to deliver wireless broadband bitrates, with Quality of Service(QoS) guarantees for different traffic classes, robust security, and mo-bility. This article provides an overview of mobile WiMAX, which is based on the wireless local and Metropolitan-Area Network (MAN) standards IEEE 802.16-2004[1] and 802.16e-2005[2]. We introduce WiMAX and focus on its mobile system profile and briefly review the role of the WiMAX Forum. We summarize the critical points of the WiMAX network reference model and present the salient charac-teristics of the PHY and MAC layers as specified in [1] and [2]. Then we address how mobile nodes enter a WiMAX network and explain the fundamentals of mobility support in WiMAX. Finally, we briefly compare WiMAX with High-Speed Packet Access (HSPA), another contender for 4G
Transport Use Case Trials of 5G-HEART Project
Full text link5G-HEART (5G HEalth AquacultuRe and Transport validation trials) project focuses on realising 5G trials and validating 5G Key Performance Indicators (KPIs) on the vital vertical use-cases of healthcare, transport and aquaculture. In the health area, 5G-HEART validates pillcams for automatic detection in screening of colon cancer and vital-sign patches with advanced geo-localization as well as 5G Augmented/Virtual Reality (AR/VR) paramedic services. In the transport area, 5G-HEART validates autonomous/ assisted/ remote driving and vehicle data services. In the aquaculture area, 5G-HEART validates 5G-based fish farm monitoring systems. Among them, transport sector connected with fifth generation (5G) mobile communications systems will drive transformational changes while bringing social, economic and industrial benefits to the economies that take the lead in its adoption. 5G-enabled industry digitisation for automotive and public transport represents 10% and 8% of the overall $1.3T market in 2026, respectively. In this paper, transport use case trials of 5G-HEART project are introduced
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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