The Experts below are selected from a list of 15408 Experts worldwide ranked by ideXlab platform
Yoonyoung Sung - One of the best experts on this subject based on the ideXlab platform.
-
VTC Spring - Light-Weight Reliable Broadcast Message Delivery for Vehicular Ad-Hoc Networks
2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 2012Co-Authors: Yoonyoung SungAbstract:Reliability as well as efficiency of transmissions is of a paramount issue for the safety critical services of VANET due to the urgency and/or significance of the Messages. To this end,various retransmission mechanisms have been studied for reliable Broadcast Message delivery in VANETs. Most of the existing approaches, though, rely on periodic beacons for retransmission decisions and intrinsically require high control overheads. Especially, in urban environments where the traffic density tends to be high, minimizing control overheads is important not only for the efficiency but also for the reliability of user Message delivery. In this paper, we propose an efficient Broadcast Message delivery mechanism, which does not rely on the periodic beacon exchanges. Based on the observation that the Broadcast Message delivery could be particularly difficult at the intersections due to the signal diffraction and attenuation caused by the obstacles such as buildings around the corners of the intersection, a novel mechanism to make efficient and effective retransmissions across an intersection is proposed. Simulation results show that the proposed mechanism can provide similar or better reliability while incurring prominently less overheads than the existing approaches.
-
ICOIN - Road-based Broadcast Message dissemination approach in VANETs
The International Conference on Information Networking 2011 (ICOIN2011), 2011Co-Authors: Yoonyoung Sung, Meejeong LeeAbstract:Broadcast is a typical Message dissemination mechanism for emergency notifications, traffic information, notice and advertisement Messages in VANETs. In this paper, we identify the cases that the Broadcast Message cannot be propagated with the Contention-Based Forwarding approach which is one of the most representative dissemination approaches for VANETs and propose road-based Broadcast Message dissemination approach for more reliable dissemination.
H. Hassanein - One of the best experts on this subject based on the ideXlab platform.
-
IPCCC - SeMAC: robust Broadcast MAC protocol for multi-hop wireless ad hoc networks
2006 IEEE International Performance Computing and Communications Conference, 2006Co-Authors: H. HassaneinAbstract:In an ad hoc network, Broadcast data communication is an unavoidable type of data transmission that provides synchronization, routing, and other Messages to all the neighboring devices. Guaranteeing that all neighboring MTs receive Broadcast Messages is a hard task in multi-hop wireless ad hoc networks, especially when the traffic load is heavy. In this paper, we propose the sequential medium access control (SeMAC) protocol which aims at collision-free communication and reduced overhead for predictable Broadcast Message to sustain dynamic changes in network topology, as well as facilitate smooth operation of peer-to-peer unicast in multi-hop ad hoc networks SeMAC is intended to complement the IEEE 802.11 DCF function and is shown in this paper to greatly enhance the performance of Broadcast and unicast communication of the IEEE 802.11.
Bidi Ying - One of the best experts on this subject based on the ideXlab platform.
-
privacy preserving Broadcast Message authentication protocol for vanets
Journal of Network and Computer Applications, 2013Co-Authors: Bidi Ying, D Makrakis, Hussein T MouftahAbstract:Abstract Vehicular Ad-hoc Networks (VANETs) will start becoming deployed within the next decade. Among other benefits, it is expected that VANETs will support applications and services targeting the increase of safety on the road, and assist in improving the efficiency of the road transportation network. However, several serious challenges remain to be solved before efficient and secure VANET technology becomes available, one of them been efficient authentication of Messages in a VANET. There is a significant body of research work addressing this issue, however, while progress has been made, the challenge is still far from having been resolved and reliable and secure systems ready for deployment becoming available. In this paper, we propose the Privacy Preserving Broadcast Message Authentication (PPBMA) scheme, which, instead of performing asymmetric verification, uses Message Authentication Code (MAC) functionality and HASH operations to authenticate Messages. Moreover, we use two-level key hash chain, which assists avoiding Message losses. Simulation results demonstrate that PPBMA has superior performances in terms of packet loss rate and Message delivery latency when compared to existing solutions. Due to this advantage, it can support emergency and routine Messages alike, while existing solutions can only support routine Messages.
Hoon Oh - One of the best experts on this subject based on the ideXlab platform.
-
RSBP: A Reliable Slotted Broadcast Protocol in Wireless Sensor Networks
Sensors, 2012Co-Authors: Phan Van Vinh, Hoon OhAbstract:In wireless sensor networks for monitoring and control applications, a sink node needs to disseminate Messages to all nodes to acquire monitoring data or to control the operation of sensor nodes. The basic flooding protocol suffers from low transmission reliability in Broadcasting Messages due to the hidden terminal problem. Besides, it can cause the Broadcast storm problem by having many nodes reBroadcast the received Message simultaneously. In order to resolve these problems while minimizing energy consumption in delivery of Broadcast Messages, we propose a reliable slotted Broadcast protocol (RSBP) that allocates Broadcast time slots to nodes based on their slot demands and then allows every node to transmit its Broadcast Message within the allocated slots. Then, every node can Broadcast Messages safely in a contention-free manner. Moreover, RSBP can be deployed easily since it does not have any specific requirements such as GPS, multi-channels and directional antennas that may not be always available in real scenarios. We show by experimental study that RSBP significantly outperforms other Broadcast protocols in terms of safety-critical packet delivery and energy consumption.
Xin Yuan - One of the best experts on this subject based on the ideXlab platform.
-
Techniques for pipelined Broadcast on ethernet switched clusters
Journal of Parallel and Distributed Computing, 2008Co-Authors: Pitch Patarasuk, Xin Yuan, Ahmad FarajAbstract:By splitting a large Broadcast Message into segments and Broadcasting the segments in a pipelined fashion, pipelined Broadcast can achieve high performance in many systems. In this paper, we investigate techniques for efficient pipelined Broadcast on clusters connected by multiple Ethernet switches. Specifically, we develop algorithms for computing various contention-free Broadcast trees that are suitable for pipelined Broadcast on Ethernet switched clusters, extend the parametrized LogP model for predicting appropriate segment sizes for pipelined Broadcast, show that the segment sizes computed based on the model yield high performance, and evaluate various pipelined Broadcast schemes through experimentation on Ethernet switched clusters with various topologies. The results demonstrate that our techniques are practical and efficient for contemporary fast Ethernet and Giga-bit Ethernet clusters.
-
IPDPS - Pipelined Broadcast on Ethernet switched clusters
Proceedings 20th IEEE International Parallel & Distributed Processing Symposium, 2006Co-Authors: Pitch Patarasuk, Ahmad Faraj, Xin YuanAbstract:We consider unicast-based pipelined Broadcast schemes for clusters connected by multiple Ethernet switches. By splitting a large Broadcast Message into segments and Broadcasting the segments in a pipelined fashion, pipelined Broadcast may achieve very high performance. We develop algorithms for computing various contention-free Broadcast trees on Ethernet switched clusters that are suitable for pipelined Broadcast, and evaluate the schemes through experimentation. The conclusions drawn from our theoretical and experimental study include the following. First, pipelined Broadcast can be more effective than other common Broadcast schemes including the ones used in the latest versions of MPICH and LAM/MPI when the Message size is sufficiently large. Second, contention-free Broadcast trees are essential for pipelined Broadcast to achieve high performance. Finally, while it is difficult to determine the optimal Message segment size for pipelined Broadcast, finding one size that gives good performance is relatively easy.
