|Title||:||Piggybacking Assisted Channel Access Techniques for Efficient Information Dissemination in VANETs|
|Speaker||:||Moumita Patra (IITM)|
|Details||:||Tue, 29 Dec, 2015 3:30 PM @ BSB 361|
|Abstract:||:||Vehicular Ad-hoc Networks (VANETs) have emerged as an area with a large number of applications. Exchanging information among vehicles is imperative for seamless application services, enforcing researchers to focus on various information dissemination techniques in VANETs. Use of CSMA as the medium access control protocol as suggested in IEEE 802.11p standard for VANETs degrades the network performance due to high contention and random transmitter selection. We propose an efficient slotted transmission mechanism and a CDMA-based many-to-many communication scheme which exploit the benefits of simultaneous transmission and piggybacking of information to improve the performance of VANETs. While allowing simultaneous transmission guarantees faster dissemination of information, piggybacking facilitates dissemination of more information per transmission, thereby keeping the network more updated.
A slotted transmission system along with piggybacking of information helps to reduce delay and increases the number of messages delivered. However, scheduling of vehicles in such a scenario poses as a challenge. An efficient scheduling algorithm for slotted transmission along with piggybacking of information helps to minimize the average system age of the network. Average system age is the mean age of a vehicle's information at any other vehicle in the network.
Many-to-many communication enables simultaneous multi-packet transmission and reception of information between vehicles. It is observed through analysis and simulations that use of many-to-many communication for all types of VANET applications gives better performance than CSMA-based VANETs in terms of average end-to-end delay and average packet delivery ratio. Introducing piggybacking of information and an efficient algorithm to select vehicles for transmission further improves the performance.