QoS in Vehicular Ad Hoc Networks – A Survey
Vehicular ad hoc networks (VANETs) are different from mobile ad hoc networks (MANETs) in terms of their requirements, characteristics, and limitations. Protocols have been categorized according to various approaches taken by authors to provide quality of service (QoS). The roadside unit approach offers more reliable guaranteed service; however, on the downside, it is more costly. Assigning a mobile agent status to one particular vehicle is another approach to provide software reusability and flexibility. However, due to its decentralized methodology, its implementation is non-existent. In an enhanced approach, MANET’s reactive and proactive protocols have been modified and implemented in VANET domain to provide QoS. In another approach, innovative techniques combine with RSU approach to enable smooth multimedia streaming. However, this extended approach also requires huge capital. Providing guaranteed services such as reliability, maximum delay, and throughput in VANETS has always been a challenging task. Fast changing topologies and high speed mobility are real challenges to cope with. However, a few protocols have been proposed that provide guaranteed services in VANETS under highway and city environments. These protocols have been characterized and their advantages and disadvantages have been commented upon. The applicability of each protocol in different scenarios is given, and the usage of establishing both vehicle-to-vehicle and vehicle-to-infrastructure communication in the real world has been highlighted. Open research issues have also been presented.
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