Analysis of Hybrid MAC Protocols in Vehicular Ad Hoc Networks (VANET) for QoS Sensitive IoT Applications

Vehicular Ad Hoc Networks (VANET) represent the base for future Intelligent Transportation system (ITS). The technology proposed to face different traffic problems related either to human safety, general safety, or Internet-related services. MAC protocols and routing protocols were developed to play a vital role in VANET communication. MAC protocols represent the time organizer to utilize the channel efficiently. This paper introduces the concept of TDMA efficiency working under hybrid protocols. It discusses recent hybrid MAC schemes and their performance in different proposed scenarios as well as in the term of TDMA frame efficiency. Efficiency of the frame serves in the enhancement and incrementing the bits in one TDMA frame. Where the efficiency is the amount of useful data to be transmitted within an allocated time can be expressed as the efficiency of access method utilized in MAC layer. Efficiency of TDMA frame represents the ratio of useful information bits to the total bits in a frame. This paper discusses hybrid MAC protocols with respect to QoS parameters. It also provides a comparison between the efficiency of hybrid MAC protocols.