Navegando por Assunto "VANET ( Vehicular ad hoc networks)"

Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Platoon-based driving protocol for multimedia transmission over vanet
(Universidade Federal do Pará, 2019-02-22) LOBATO JÚNIOR, Wellington Viana; VILLAS, Leandro Aparecido; http://lattes.cnpq.br/9830590737740134; ROSÁRIO, Dênis Lima do; http://lattes.cnpq.br/8273198217435163
Vehicular Ad-hoc NETworks (VANETs) allow users, services, and vehicles to share information, and will change our life experience with new autonomous driving applications. Multimedia will be one of the core services in VANETs, and are becoming a reality in smart environments, ranging from safety and security trafic warnings to live entertainment and advertisement videos. However, VANETs have a dynamic network topology with short contact time, which leads to communication aws and delays, increasing packet loss and decreasing the Quality of Experience (QoE) of transmitted videos. To cope with this, neighbor vehicles moving on the same direction and wishing to cooperate should form a platoon, where platoon members act as a relay node to forward video packets in autonomous VANETs. This master's dissertation introduces a Game Theory approach for Platoon-based driving (GT4P) for video dissemination services in urban and highway VANET scenarios. GT4P encourages the cooperation between neighbor vehicles by offering reward (money or coupon) for vehicles participating in the platoon. In this sense, GT4P establishes a platoon by taking into account vehicle direction, speed, distance, link quality, and travel path, which reduces the impact of vehicle mobility on the video transmission. Simulation results confirm the eficiency of GT4P for ensuring video transmissions with high QoE support compared to existing platoon-based driving protocols.
Acesso aberto (Open Access)
QoE and QoS-aware handover for vídeo transmission in heterogeneous vehicular networks
(Universidade Federal do Pará, 2018-03-19) MEDEIROS, Iago Lins de; CERQUEIRA, Eduardo Coelho; http://lattes.cnpq.br/1028151705135221
Vehicle Ad Hoc Networks (VANETs) offer a wide range of multimedia services ranging from safety and traffic warnings to entertainment and advertising videos. In this context, users can access content through vehicle-to-infrastructure (V2I) communication, which may consider different wireless networks, such as, LTE, Wi-Fi, etc. However, video streaming at a VANET with Quality of Experience (QoE) and Quality of Service (QoS) is a challenging task, due to the high vehicle’s mobility that causes communication failure with the infrastructure. To mitigate such factors, this master’s dissertation presents a handover algorithm that considers QoE, Quality of Service (QoS) and channel quality in heterogeneous networks, known as handover aware of Quality of Service, Experience and Radio (SER). The proposed algorithm considers the Analytic Hierarchy Process (AHP) to adjust the degree of importance of each criteria in choosing the appropriate radio base station that the mobile node must connect to, allowing a more efficient handover decision for video transmission with QoE support. Simulation results show that SER handover delivered videos with QoE 15 % better compared to the algorithms found in the literature.