76 documents found, page 1 of 8
Millimeter-wave testbed and modeling in NeXt generation URLLC communications
Dias, Eurico; Garcia Raposo, Duarte Miguel; Esfahanizadeh, Homa; Cohen, Alejandro; Vasudevan, Vipindev Adat; Ferreira, Tania; Luís, MiguelModeling realistic millimeter-wave (mmWave) channels is crucial to the study of ultra-reliable communication in next-generation wireless networks. MmWave provides significant gains over sub-6GHz communication but has very stringent requirements on channel conditions, since slight variations in the channel may result in significant performance degradation of mmWave communication. In this work, we present an expe...
Improving mmWave backhaul reliability: a machine-learning based approach
Ferreira, Tânia; Figueiredo, Alexandre; Raposo, Duarte; Luís, Miguel; Rito, Pedro; Sargento, SusanaWiGig technologies, such as IEEE 802.11ad and later IEEE 802.11ay, provide multi-gigabit short-range communication at 60 GHz for bandwidth-intensive applications. However, this band suffers from high propagation losses that can only be compensated using highly directional antennas, making millimeter-wave (mmWave) links susceptible to blockage and errors. This high sensitivity to blockage leads to unstable and u...
Hybrid wireless network with SDN and legacy devices in ad-hoc environments
Sousa, Daniela; Sargento, Susana; Luís, MiguelOn temporary events, like concerts or emergency scenarios, where a communication infrastructure may not be sufficient or even present, networks can be built in a spontaneous way with the available network elements and radio access technologies, to support proper communication and data access. However, these ad-hoc networks, without a centralized view, can be inefficient when compared to a detached centralized c...
Context-based caching in mobile information-centric networks
Leira, Luís; Luís, Miguel; Sargento, SusanaWireless networking is expected to sustain the direct interaction between personal users’ devices, and to provide connectivity on large-scale resource-constrained devices. However, conventional networking protocols fail in large scale mobile wireless environments, due to node mobility, dynamic topologies, and intermittent connectivity. Information-Centric Networking (ICN) has been considered the most promising ...
A multi-layer probing approach for video over 5G in vehicular scenarios
LOPES, RUI; Rocha, Filipe; Sargento, Susana; Luís, Miguel; Leitão, Ricardo; Marques, Eduardo; Antunes, BrunoFifth generation (5G) technologies are becoming a reality throughout the world. In parallel, vehicular networks rise their pace in terms of utilization; moreover, multimedia content transmissions are also getting an always increasing demand by their users. Besides the promised performance of 5G networks, several questions still arise among the community: are these networks capable of delivering high quality vid...
Consumer mobility awareness in named data networks
Caldeira Hernandez, Diego; Luís, Miguel; Sargento, SusanaMobile data traffic has increased significantly due to the evolution of wireless communication technologies. The Information Centric Network paradigm is considered as an alternative to bypass the restrictions imposed by the traditional IP networks, especially those related with the mobility of its users. Despite the potential advantages of this paradigm regarding mobile wireless environments, several research c...
Handling producer and consumer mobility in IoT publish-subscribe named data net...
Caldeira Hernandez, Diego; Gameiro, Luís; Senna, Carlos; Luís, Miguel; Sargento, SusanaIn recent years, the Internet of Things (IoT) has become a standard facet of modern communications, and information-centric networks have been pointed as an alternative to bypass the restrictions imposed by the traditional Internet protocol networks regarding the mobility of its network elements. However, the improvements imposed by this new paradigm fall short in large scale mobile wireless distributed environ...
Mobility sensing and V2X communication for emergency services
Figueiredo, Andreia; Rito, Pedro; Luís, Miguel; Sargento, SusanaThe warning of traveling emergency response vehicles (ERVs) is performed through the help of both sound and lights when the ERV is approaching. This is not an ideal situation for, at least, two reasons: the information is received only when the ERV is very close to other vehicles; and the other vehicles cannot understand where exactly the ERV is, and which action is the best according to its location and direct...
On the real experimentation and simulation models for millimeter-wave
Figueiredo, Alexandre; Ferreira, Tânia; Raposo, Duarte; Luís, Miguel; Rito, Pedro; Sargento, SusanaThe emergence of millimeter-wave based technologies is pushing the deployment of the 5th generation of mobile communications (5G), on the potential to achieve multi-gigabit and low-latency wireless links. Part of this breakthrough was only possible with the introduction of small antenna arrays, capable to form highly directional and electronically steerable beams. This strategy allowed the overcoming of some dr...
MobiWise: eco-routing decision support leveraging the internet of things
Aguiar, Ana; Fernandes, Paulo; Guerreiro, Andreia P.; Tomás, Ricardo; Agnelo, João; Santos, José Luís; Araújo, Filipe; Coelho, Margarida C.Eco-routing distributes traffic in cities to improve mobility sustainability. The implementation of eco-routing in real-life requires a diverse set of information, including different kinds of sensors. These sensors are often already integrated in city infrastructure, some are technologically outdated, and are often operated by multiple entities. In this work, we provide a use case-oriented system design for an...