LISA: Listening-based immediate SCH access scheme in VANETs

Vehicle Ad-Hoc Networks was developed in order to improve the safety and comfort while driving a car. Thereby, IEEE 802.11p and IEEE 1609.4 are used for this purpose. However, these protocols showed some limitations, and this is showed through the low probability of successful transmission for safety messages and through the low throughput achieved for service messages. This paper proposes new mechanism, Listening-based Immediate SCH Access (LISA), which enhances the channel utilization, i.e. improving the probability of successful safety packets transmission and increasing the throughput for service packets. Using LISA scheme, the probability of successful transmission has increased by 14% when the probability of transmission is equal to 80%, and the throughput has increased up to five times compared to the original protocol.