Abstract
With the arrival of 5G, the wireless network will be provided with abundant spectrum resources, massive data transmissions and low latency communications, which makes Vehicle-to-Everything applications possible. However, VANETs always accompany with frequent network topology changes due to the highly mobile feature of vehicles. As a result, the network performance will be affected by the frequent handover. In this paper, a seamless handover scheme is proposed where the Software-Defined Networking (SDN) and Mobile Edge Computing (MEC) technologies are employed to adapt to the dynamic topology change in VANETs. The introduction of SDN provides a global view of network topology and centralized control, which enables a stable transmission layer connection when a handover takes place, so that the upper layer performance is not influenced by the network changes. By employing MEC server, the data are cached in advance before a handover happens, so that the vehicle can restore normal communication faster. In order to confirm the superiority of our proposal, computer simulations are conducted from different aspects. The results show that our proposal can significantly improve the network performance when a handover happens.
Highlights
In recent years, with the rapid development of communication technology, the Vehicular Ad hoc NETwork (VANET) technology [1,2] is regarded as one of the main solutions that are able to provide a wide variety of services in vehicular environments
We improve the previous work by proposing a new caching algorithm based on mobile edge computing, and introduce a new idea of two level Software-Defined Networking (SDN) controller that utilizes the global view of SDN to improve the overall efficiency
Level 2 is formed by base stations which are equipped with SDN controllers and Mobile Edge Computing (MEC) servers to proactively cache data in MEC servers to reduce packet loss during the handover
Summary
With the rapid development of communication technology, the Vehicular Ad hoc NETwork (VANET) technology [1,2] is regarded as one of the main solutions that are able to provide a wide variety of services in vehicular environments. MEC is employed to support handover by proactively caches the data at the new base station. Another key technology worth mentioning is the Software-Defined Networking (SDN). We propose a scheme that uses SDN technology to achieve a global view of network and conducts a handover by maintaining the same address. We improve the previous work by proposing a new caching algorithm based on mobile edge computing, and introduce a new idea of two level SDN controller that utilizes the global view of SDN to improve the overall efficiency. The data under transmissions will be cached on the MEC server which belongs to the another base station that the vehicle will handover to.
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