Channel Switching and Time slot Techniques for TDMA MAC in VANETs

Abstract

vehicular ad hoc network [1, 2, 3] is a connection of moving and stationary vehicles newlineformed with the network infrastructure, RSU, and base station. Vehicles transmit messages, newlinepredict traffic congestion and avoid accidents. Vehicular communication is based on shared and newlinededicated channel resources with access techniques such as FDMA, CDMA, and TDMA. In newlineTDMA, the vehicles are allocated a dedicated time slot to access the channel resources. In this newlineresearch work, we focuses on channel switching and time slot techniques for TDMA MAC in newlineVANETs. The time slot is allocated to the prioritized vehicles for efficient channel resource newlineutilization. For secure time slot allocation and message transmission for the authentic nodes, in newlinethe research work we have proposed an ECC-based authentication for TDMA-based MAC. newlineThe initial part of the research work includes a comparative study of Contention-based and newlineContention-free MAC protocols in VANETs [4]. The detailed classification includes TDMAbased contention-free MAC protocols based on centralized, distributed, and hybrid approaches. newlineIn this chapter, we have analyzed the allocation of time slots for fixed and variable disjoint set newlineof time slots. The approaches used for splitting the total time into time frames and time slots are newlinediscussed in this chapter. The TDMA-based approaches proposed by researchers for channel newlineswitching, time slot, prioritization, and security are discussed in the chapter. Also, at the end of newlinethe chapter, the solution for the collision resolution by TDMA MAC approaches is discussed. newlineIn the proposed channel-switching approach [5], messages are analyzed to identify the newlinechannel for message transmission. Amongst the four SCH (service channels) and one CCH newline(control channel), the most appropriate channel is allocated to the vehicles for message transmission. If required channel is not availabile, then the next most appropriate channel is allocated. The proposed Markovian model calculates the probability of channel switching ...