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The transmission of safety applications in VANET is clearly the top concern. However, the non-safety applications, which improve the quality of experience, as well as the efficiency of the traffic, also need to be paid more attention. In VANET, the safety applications are transmitted in control channel interval and the non-safety applications can be transmitted only in service channel interval. In this paper, we propose a priority-based multichannel MAC to support the non-safety applications in service channel interval in Vehicle-to-Infrastructure communication with the presence of roadside unit. The novel MAC also allocates service channel according to the priority and divides the vehicles, which have the same required service channel, into four priority groups to enhance the EDCA mechanism. We use the mathematical model and the simulation for evaluating the performance under the influence of velocity with a different number of vehicles in the network.

This paper evaluates the quality of service (QoS) in Wi-Fi networks considering medium access control algorithms. It provides the wireless local area networks (WLAN) traffic analysis based on hotspot statistics. It also studies the distribution of physical layer frame arrival time and channel utilization time. The results show the presence of self-similar distribution dramatically influencing the QoS parameters. The paper suggests QoS evaluation model in Wi-Fi public networks considering both user and signaling traffic.

The article proposes algorithms for allocating channel resources in a heterogeneous radio access network that simultaneously uses the frequency resources of a 5G network and an unlicensed wireless access network. It is shown that the use of a balancer in such network will make it possible to level the problem of the mutual wireless technologies influence, in particular, interference. To implement the algorithms, it is proposed to use the capabilities of the cloud server architecture.

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