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In this paper, a unified analytical framework is established to study the performance of multichannel Drive-thru Internet systems. However, originally designed for quasi-static single-channel-based small-scale indoor applications, the performance of IEEE 802.11 in the outdoor vehicular environment, where a large number of fast-moving vehicles simultaneously contend for channel access in the multichannel environment, is still unclear. For the purpose of efficiently supporting various services, Wireless Access in Vehicular Environment (WAVE), which is the standard for VANETs communications, specifies multichannel utilization, where the overall bandwidth is subdivided into seven channels, namely, one Control Channel (CCH) and six Service Channels (SCHs).

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Drive-thru Internet systems are multiple-access wireless networks in which users in moving vehicles request/receive services such as digital map update and MP3 download to/from a Road Side Unit (RSU) as the vehicles pass through the coverage range of the RSU. Recently, the interest regarding Drive-thru Internet systems has been rapidly arising in industrial and academic fields in view of the widespread adoption of IEEE 802.11 networks and its great potential to provide cost-effective Internet access.

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Finally, we discuss the open issues to improve the MAC performance and future work on MAC design for VANETs. From the viewpoint of 7 aspects, we compare the advantages and disadvantages of these typical MAC protocols.

General design and optimization mechanisms of these commonly used MAC protocols for VANETs are reviewed. Both are further discussed based on their hierarchical structures, i.e., distributed and centralized structures. Then, we divide the MAC protocols proposed for VANETs into single-channel MAC protocols and multi-channel MAC protocols according to the number of physical occupied spectrum resources. In this paper, we review the standards of some countries for VANETs. Medium access control (MAC) protocols can ensure fair and efficient sharing of channel resources among multiple vehicles for VANETs, which can provide timely packet transmissions and significantly improve road safety. Vehicular ad hoc networks (VANETs) need to support the timely end-to-end transmissions of safety and non-safety messages.

In this paper, the analysis and simulation results of highway and four-way intersection scenarios are given and the validity of the ASMAC protocol is verified by comparing with the VeMAC and SAMD protocols. When the vehicle finds that there is no accessible time slot in the time slot set, it accesses the available time slot in the reverse time slot set to improve the efficiency of time slot access. The vehicle selects a time slot access corresponding to the time slot set. In the ASMAC protocol, the frame is divided into several time slots based on TDMA, and the time slots in a frame are divided into two time slot sets according to the driving direction. ASMAC adapts the access time slot according to the driving direction of the vehicle and the traffic density ratio to improve the time slot access efficiency. In this paper, we propose an adaptive time slot access MAC protocol in distributed VANET (ASMAC). The existing MAC protocol with fixed time slot allocation cannot solve the problem of time slot resource exhaustion or waste when the traffic density is unbalanced. Download it and make the most of the fastest P2P network.The media access control (MAC) protocol is responsible for channel resource sharing and conflict management in the communication process in VANET, which is of great significance for ensuring efficient and reliable communication. Transmission also offers you the chance to control it remotely by accessing it by means of a web interface, which makes it one of the best options to download from the BitTorrent network from a Mac.

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Possibly the best torrent download client for Mac.

Possibility to access it on the web and control it remotely.

Security options to generate blacklists and block downloads.

And although like the majority of clients, it doesn't include a search engine, it does have a refined interface programmed in Cocoa that provides it with a very functional design. It includes the usual options available in this kind of programs, like those that make the transfers secure, but it also includes protection options to draw up blacklists of files, users and IPs. Transmission is one of the most complete BitTorrrent clients and it can even be considered that it is better than the official client. A BitTorrent download client that outdoes its rivals torrent download clients for Apple computers. Transmission has become one of the best solutions to download files from the BitTorrent network.