Browsing by Author "Silva, Miguel"
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- Edge virtualization in multihomed vehicular networksPublication . Silva, Miguel; Luís, Miguel; Sargento, SusanaVehicular Networks (VANETs) are a critical component of a Smart City environment. They extended the connectivity plane with support for a wide range of applications, from safety to entertainment. Such services, when deployed outside the vehicular network, may imply an additional delay, which can be critical. In addition, these services become inaccessible whenever the vehicles lose contact with the infrastructure.This paper proposes a practical solution that aims to minimize the impact of the services' location and its inaccessibility in a VANET. The solution focuses on using Network Function Virtualization technologies to support the deployment of the services at the edge of a mobility-enabled multihomed VANET, thus allowing the services to be accessible in intermittent connectivity situations, as well as enabling lower delays for critical services. The results obtained show that the solution is capable of deploying services at the edge of the VANET with low delay and with a fast recovery when in handover and mobility scenarios.
- Exploring software defined networks for seamless handovers in vehicular networksPublication . Silva, Miguel; Teixeira, Pedro; Anjos Gomes, Christian; Dias, Duarte; Luís, Miguel; Sargento, SusanaWith the growing interest in autonomous driving, constant connectivity for vehicles is becoming essential to enable the complete knowledge of the surrounding area, transmit and receive data that is crucial for the autonomous control. The vehicle mobility results in frequent service interruptions, and therefore, seamless handovers are required to mitigate this problem. Several IP-based solutions have been proposed in the literature, but they require tunneling approaches, which present excessive signaling and data overhead, service delay, and packet loss. One of these approaches, the NEMO-enabled Proxy Mobile IPv6 (N-PMIPv6) architecture, supports transparent handovers and simultaneous multi-homing, but at the cost of a high complexity and network overhead. This work explores the flexibility of Software Defined Networks (SDNs) in the management of a Vehicular Ad-hoc NETwork (VANET). In particular, the SDN concept is used to provide a seamless horizontal handover for the vehicle and its end-users. Two different SDN architectures are proposed, evaluating the impact of the depth of the softwarization environment. Real vehicular hardware and emulated mobility scenarios are used in the evaluation process where different application services are exploited. Results show that the lower complexity of the SDN solution allows for a better performance during a handover in a VANET, in terms of delays, packet losses and network overhead, making it seamless for the vehicles and its users.
- Using aerial and vehicular NFV infrastructures to agilely create vertical servicesPublication . Nogales, Borja; Silva, Miguel; Vidal, Ivan; Luís, Miguel; VALERA, FRANCISCO; Sargento, Susana; Azcorra, Arturo5G communications have become an enabler for the creation of new and more complex networking scenarios, bringing together different vertical ecosystems. Such behavior has been fostered by the network function virtualization (NFV) concept, where the orchestration and virtualization capabilities allow the possibility of dynamically supplying network resources according to its needs. Nevertheless, the integration and performance of heterogeneous network environments, each one supported by a different provider, and with specific characteristics and requirements, in a single NFV framework is not straightforward. In this work we propose an NFV-based framework capable of supporting the flexible, cost-effective deployment of vertical services, through the integration of two distinguished mobile environments and their networks: small sized unmanned aerial vehicles (SUAVs), supporting a flying ad hoc network (FANET) and vehicles, promoting a vehicular ad hoc network (VANET). In this context, a use case involving the public safety vertical will be used as an illustrative example to showcase the potential of this framework. This work also includes the technical implementation details of the framework proposed, allowing to analyse and discuss the delays on the network services deployment process. The results show that the deployment times can be significantly reduced through a distributed VNF configuration function based on the publish-subscribe model.