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Importance Of Wireless Access In Vehicular Communication

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Research development of recent years has identified the Wireless Access in Vehicular Environment (WAVE) technology as a prominent and efficient candidate for future vehicular communication. Under WAVE standard safety messages are broadcast or exchanged between all involved mobiles at the rate of 1 to 10 Hz. However, in a congested environment, Broadcast Storm (BSt) problem naturally occurs and exhausts the available channel bandwidth thereby rendering exchange and sharing of vital information impossible. In our recent work, the Dynamic Broadcast Storm Mitigation Algorithm (DBSMA) proved to be a good candidate for BSt problem mitigation for Cooperative Awareness Messages (CAMs) only. In the present work, the DBSMA is improved (IDBSMA) to …show more content…

The DSRC [3] was initially coined in USA [4] by the Federal Communication Commission (FCC) [5]. Beside tremendous effort and contribution done all over the world to ensure effective implementation of the WAVE technology into modern automobile, numerous challenges are still hindering the success and integration of the embedded benefits brought by this technology into modern cars. One of the most critical challenges is the message congestion caused by a Broadcast Storm (BSt) problem. In fact, the European Telecommunication Standards Institute (ETSI) has defined two types of messages for safety-related applications, namely, Cooperative Awareness Messages (CAMs) [6] and Decentralized Environmental Notification Messages (DENMs) [7]. CAMs type message must be broadcasted periodically at the rate of 1–10Hz, depending on the context. A Wave Short Message (WSMP) of type CAMs or Basic Safety Messages (BSMs) of 200 bytes frame long contains information about the mobile’s position, speed, and direction of the vehicle. In general, CAM messages are time triggered and is broadcasted continuously every 50 ms during the Control Channel (CCH) time interval. DENMs, however are event driven type messages and triggered when a safety-critical situation occurs. Based on the standard prescription, when several vehicles are found in the same

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