|Title||:||Novel Sleep-mode Enabled RSU Placement and Cellular Infrastructure Based Solutions for Low Cost and Energy Efficient VANETs|
|Speaker||:||Moumita Patra (IITM)|
|Details||:||Tue, 8 Mar, 2016 2:00 PM @ BSB 361|
|Abstract:||:||Vehicular Ad-hoc Networks (VANETs) have emerged as an area with a large number of applications. The highly distributed environment of VANETs poses a challenge in achieving continuous connectivity and seamless execution of applications. For continuous connectivity, it is mandatory to have high coverage. Road Side Units (RSUs) are static infrastructure units which act as gateways to the Internet and are responsible for providing coverage in VANETs. Thus, for high coverage, it is necessary to place more RSUs in a given area. However, placement of more RSUs leads to high deployment and maintenance cost. Therefore, it is necessary to place RSUs in such a way that the aforementioned costs are reduced without compromising on the delay and Packet Delivery Ratio (PDR) constraints. Moreover, RSUs use grid power which is dependant on non-renewable energy resources. Use of non-renewable energy resources has adverse effects on the environment. Thus, it is necessary to reduce the amount of energy consumed by RSUs.
In the literature, different placement strategies have been proposed to reduce the deployment and maintenance cost of RSUs and various scheduling techniques have been proposed for sleep-mode enabled RSUs to reduce the total energy consumed. However, to get both the benefits, it is required to have a combined solution which will ensure efficient placement and scheduling of sleep-mode enabled RSUs. Hence, we propose joint placement and sleep scheduling of RSUs such that the total cost and energy consumption at RSUs are reduced without compromising on delay and PDR. We formulate an optimization problem which captures the behaviour of a realistic scenario and propose an Energy Efficient Candidate Location Selection algorithm to jointly perform placement and sleep scheduling of grid-connected solar powered RSUs.
Looking at the advantages of cellular networks, such as LTE, it has been suggested in the literature that cellular networks are capable of fulfilling the demands posed in VANET scenarios. Availability of high bandwidth, large coverage area, and low latency are some of the advantages of cellular networks which help in overcoming the challenges of high speed vehicular communication. Hence, we propose a VANET with cellular infrastructure as a backbone and analyse its performance in terms of delay, throughput, and energy efficiency. We use mobile Femto Access Points (FAPs) as relays in order to reduce the deployment and maintenance cost and the amount of energy consumed. Simulation results show that introducing cellular network as a backbone with mobile FAPs as relays, gives much better performance in terms of delay and energy consumed when compared to traditional VANET scenario where IEEE 802.11p standard is used and RSUs act as gateways.