The emerging adoption of wireless communications on surface transportation systems has generated ... more The emerging adoption of wireless communications on surface transportation systems has generated extensive interest among researchers over the last several years. Innovative inter-vehicular communications and vehicle-to-infrastructure communications achieve road traffic safety, ecstatic driving and delightful travelling experiences. Multi-hop information dissemination in vehicular ad hoc networks is challenged by high mobility and frequent disconnections of wireless nodes. This paper presents a new routing scheme for Highway/Freeway VANETs, which consists of a unicast destination discovery process, a robust forward node selection mechanism and a positional hello mechanism. In this paper, no dedicated path is framed in order to prevent frequent path maintenance. In addition, the avoidance of flooding and location services substantially reduces the control overhead. Positional hello scheme ensures connectivity and diminishes control overhead concurrently. Simulation results signify the benefits of the proposed routing strategy (i.e. DDOR) has higher packet delivery ratio, reduced routing overhead and shorter delay compared with previous works.
Vehicular Ad Hoc Network has recently been considered as attractive network architecture to provi... more Vehicular Ad Hoc Network has recently been considered as attractive network architecture to provide various services ranging from road safety to entertainment applications.
Routing in vehicular network is a major challenge and research area. The major threat is the node... more Routing in vehicular network is a major challenge and research area. The major threat is the node density and high dynamics of the network topology. Existing position based routing protocols try to solve this by forwarding data in greedy forwarding way. However, they solely depend upon Location services. Location service makes a lot of transactions in the network traffic. Proactive routing protocols find the destination information by flooding RREQ messages. But flooding also increases routing overhead. Again they maintain a route from source to destination. The lifetime of route is same as the life time of the edge with smallest life time. This makes it vulnerable to path break up, which leads to frequent RREQ flooding. We have tried to solve the above stated problems in three manners: (1) Location service overhead problem: We have not used any location server; rather a destination discovery message is sent from source to destination which finds the destination direction relative to source. If the destination direction is known this is not used. (2) Flooding of RREQ problem: We have not used any flooding. We have used only unicast messages. (3) Path break-up problem: We have not used any dedicated path from source to destination for data transmission. Rather we have selected the next hop in the direction of destination to send a packet using an algorithm called smart next hop selection algorithm (SNESA). Also we have tried to reduce the frequency of HELLO messages using neighbor update algorithm which validates the neighborhood of a node.
IEEE Transactions on Intelligent Transportation Systems, 2011
Vehicular ad hoc networks (VANETs) have recently been considered as an attractive network archite... more Vehicular ad hoc networks (VANETs) have recently been considered as an attractive network architecture to provide various services ranging from road safety to entertainment applications. In this paper, we propose an IEEE-802.11-based multihop broadcast protocol to address the issue of emergency message dissemination in VANETs. The protocol adopts a binary-partition-based approach to repetitively divide the area inside the transmission range to obtain the furthest possible segment. The forwarding duty is then delegated to a vehicle chosen in that segment. Aside from accomplishing directional broadcast for highway scenario, the protocol also exhibits good adaptation to complex road structures. The main focus of the paper lies in reducing broadcast delay, which is an important factor for time-critical safety applications. Most importantly, the contention delay remains almost constant, irrespective of vehicle density. Mathematical analysis is performed to assess the effectiveness of the protocol. Simulation results demonstrate that the proposed protocol imparts greater performance in terms of latency and message progress when compared with contemporary multihop broadcast protocols for VANETs.
The emerging adoption of wireless communications on surface transportation systems has generated ... more The emerging adoption of wireless communications on surface transportation systems has generated extensive interest among researchers over the last several years. Innovative inter-vehicular communications and vehicle-to-infrastructure communications achieve road traffic safety, ecstatic driving and delightful travelling experiences. Multi-hop information dissemination in vehicular ad hoc networks is challenged by high mobility and frequent disconnections of wireless nodes. This paper presents a new routing scheme for Highway/Freeway VANETs, which consists of a unicast destination discovery process, a robust forward node selection mechanism and a positional hello mechanism. In this paper, no dedicated path is framed in order to prevent frequent path maintenance. In addition, the avoidance of flooding and location services substantially reduces the control overhead. Positional hello scheme ensures connectivity and diminishes control overhead concurrently. Simulation results signify the benefits of the proposed routing strategy (i.e. DDOR) has higher packet delivery ratio, reduced routing overhead and shorter delay compared with previous works.
Vehicular Ad Hoc Network has recently been considered as attractive network architecture to provi... more Vehicular Ad Hoc Network has recently been considered as attractive network architecture to provide various services ranging from road safety to entertainment applications.
Routing in vehicular network is a major challenge and research area. The major threat is the node... more Routing in vehicular network is a major challenge and research area. The major threat is the node density and high dynamics of the network topology. Existing position based routing protocols try to solve this by forwarding data in greedy forwarding way. However, they solely depend upon Location services. Location service makes a lot of transactions in the network traffic. Proactive routing protocols find the destination information by flooding RREQ messages. But flooding also increases routing overhead. Again they maintain a route from source to destination. The lifetime of route is same as the life time of the edge with smallest life time. This makes it vulnerable to path break up, which leads to frequent RREQ flooding. We have tried to solve the above stated problems in three manners: (1) Location service overhead problem: We have not used any location server; rather a destination discovery message is sent from source to destination which finds the destination direction relative to source. If the destination direction is known this is not used. (2) Flooding of RREQ problem: We have not used any flooding. We have used only unicast messages. (3) Path break-up problem: We have not used any dedicated path from source to destination for data transmission. Rather we have selected the next hop in the direction of destination to send a packet using an algorithm called smart next hop selection algorithm (SNESA). Also we have tried to reduce the frequency of HELLO messages using neighbor update algorithm which validates the neighborhood of a node.
IEEE Transactions on Intelligent Transportation Systems, 2011
Vehicular ad hoc networks (VANETs) have recently been considered as an attractive network archite... more Vehicular ad hoc networks (VANETs) have recently been considered as an attractive network architecture to provide various services ranging from road safety to entertainment applications. In this paper, we propose an IEEE-802.11-based multihop broadcast protocol to address the issue of emergency message dissemination in VANETs. The protocol adopts a binary-partition-based approach to repetitively divide the area inside the transmission range to obtain the furthest possible segment. The forwarding duty is then delegated to a vehicle chosen in that segment. Aside from accomplishing directional broadcast for highway scenario, the protocol also exhibits good adaptation to complex road structures. The main focus of the paper lies in reducing broadcast delay, which is an important factor for time-critical safety applications. Most importantly, the contention delay remains almost constant, irrespective of vehicle density. Mathematical analysis is performed to assess the effectiveness of the protocol. Simulation results demonstrate that the proposed protocol imparts greater performance in terms of latency and message progress when compared with contemporary multihop broadcast protocols for VANETs.
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Papers by Jagruti Sahoo