Browsing by Author "Rocha, Filipe"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Complementing vehicular connectivity coverage through cellular networksPublication . Rocha, Filipe; Luís, Miguel; Zúquete, André; Sargento, SusanaVehicular Ad hoc Networks (VANETs) support the development of safety and infotainment applications, allowing vehicles to communicate between each other and with the infrastructure, assuring their connection and of its occupants to the Internet These VANETs may rely on different technologies for their deployment, such as IEEE 802.11p/WAVE, C-V2X or Wi-Fi; however, complete coverage and full connectivity may not be assured. This work integrates, in a seamless approach, an additional communication interface via cellular networks into an existing VANET with mobility and multihoming support in order to increase its connection availability. The proposed solution makes use of commercial cellular networks without the need of any contribution by network providers, and maintaining transparency to the end-user. The validation and evaluation of the proposed solution was performed with a real network in real- world scenarios. The results showed that the proposed approach is able to maintain and increase the VANET connectivity.
- A multi-layer probing approach for video over 5G in vehicular scenariosPublication . 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 video streaming services in moving scenarios? What is the relationship between the network conditions and the video quality of experience? To answer to the previous questions, in this paper we propose a multi-layer probing approach able to assess video transmissions over 5G and 4G, combining data from all layers of a communication model, relating events from its origin layers. The probe's potential is thoroughly evaluated in two distinct video streaming use cases, both targeting a vehicular scenario supported by cellular 4G and 5G networks. Regarding the probe's performance, we show that a multitude of performance and quality indicators, from different stack layers, can be obtained. As for the performance of 4G and 5G networks in video streaming scenarios, the results have shown that the 5G links show a better overall performance in terms of video quality-of-experience, granting lower delays and jitter conditions, thus allowing video delay to be diminished and segment buffering to be better performed in comparison to 4G, while still showing adaptability in lightly traffic-saturated vehicular-to-vehicular scenarios.