The Experts below are selected from a list of 14688 Experts worldwide ranked by ideXlab platform

Lili Qiu - One of the best experts on this subject based on the ideXlab platform.

  • SOAR: Simple opportunistic adaptive routing protocol for wireless mesh networks
    IEEE Transactions on Mobile Computing, 2009
    Co-Authors: Eric Rozner, Jayesh Seshadri, Yogita Mehta, Lili Qiu
    Abstract:

    Multihop wireless mesh networks are becoming a new attractive communication paradigm owing to their low cost and ease of deployment. Routing protocols are critical to the performance and reliability of wireless mesh networks. Traditional routing protocols send traffic along predetermined paths and face difficulties in coping with unreliable and unpredictable wireless medium. In this paper, we propose a simple opportunistic adaptive routing protocol (SOAR) to explicitly support multiple simultaneous flows in wireless mesh networks. SOAR incorporates the following four major components to achieve high throughput and fairness: 1) adaptive Forwarding path selection to leverage path diversity while minimizing duplicate transmissions, 2) priority timer-based Forwarding to let only the best Forwarding Node forward the packet, 3) local loss recovery to efficiently detect and retransmit lost packets, and 4) adaptive rate control to determine an appropriate sending rate according to the current network conditions. We implement SOAR in both NS-2 simulation and an 18-Node wireless mesh testbed. Our extensive evaluation shows that SOAR significantly outperforms traditional routing and a seminal opportunistic routing protocol, ExOR, under a wide range of scenarios.

Hai Zhao - One of the best experts on this subject based on the ideXlab platform.

  • A Multi-Hop Broadcast Protocol for Emergency Message Dissemination in Urban Vehicular Ad Hoc Networks
    IEEE Transactions on Intelligent Transportation Systems, 2016
    Co-Authors: Yuanguo Bi, Hangguan Shan, Xuemin Sherman Shen, Ning Wang, Hai Zhao
    Abstract:

    In vehicular ad hoc networks (VANETs), multi-hop wireless broadcast has been considered a promising technology to support safety-related applications that have strict quality-of-service (QoS) requirements such as low latency, high reliability, scalability, etc. However, in the urban transportation environment, the efficiency of multi-hop broadcast is critically challenged by complex road structure, severe channel contention, message redundancy, etc. In this paper, we propose an urban multi-hop broadcast protocol (UMBP) to disseminate emergency messages. To lower emergency message transmission delay and reduce message redundancy, UMBP includes a novel Forwarding Node selection scheme that utilizes iterative partition, mini-slot, and black-burst to quickly select remote neighboring Nodes, and a single Forwarding Node is successfully chosen by the asynchronous contention among them. Then, bidirectional broadcast, multi-directional broadcast, and directional broadcast are designed according to the positions of the emergency message senders. Specifically, at the first hop, bidirectional broadcast or multi-directional broadcast conducts the Forwarding Node selection scheme in different directions simultaneously, and a single Forwarding Node is successfully chosen in each direction. Then, directional broadcast is adopted at each hop in the message propagation direction until the emergency message reaches an intersection area where multi-directional broadcast is performed again, which finally enables the emergency message to cover the target area seamlessly. Analysis and simulation results show that the proposed UMBP significantly improves the performance of multi-hop broadcast in terms of one-hop delay, message propagation speed, and message reception rate.

Xiaojun Wang - One of the best experts on this subject based on the ideXlab platform.

  • A Frequency Scalable Publish-Subscribe Forwarding Node
    2015 International Conference on Network and Information Systems for Computers, 2015
    Co-Authors: Xing Zheng, Juan Cao, Xing Qin, Lingling Sun, Jie Jin, Xiaojun Wang
    Abstract:

    Due to the ever increased energy consumption, large research effort has devoted to the energy efficiency area. In this paper, a frequency scalable publish-subscribe filter Forwarding Node has been proposed and implemented for addressing this challenge. The frequency scaling filter can operate on three different frequencies, which adapts its capacity and power on different network throughput. Our work show that the proposed frequency scaling filter Forwarding Node can improves the Forwarding speed of the router and more importantly reduces considerably the power consumption.

  • Energy efficient solutions for the networks and routers
    Proceedings of the 2015 International Conference on Electrical Computer Engineering and Electronics, 2015
    Co-Authors: Xing Zheng, Lingling Sun, Jie Jin, Xiaojun Wang
    Abstract:

    Under the pressure of the global CO2 emission, energy efficiency is one of the most important aspects that need considerations in designing the future Internet. For reducing the power consumption of the Internet, people should focus their research attentions on the power-aware networks design and most power consuming networking devices such as routers. This paper overviews a number of promising solutions in recent years for reducing the energy consumption of the networks and routers. Moreover, we present our research achievement about an energy efficient networking Forwarding Node on the NetFPGA platform by combining the salient advantages of the Bloom filter based publish/subscribe Forwarding Node and frequency scaling. Our findings show that the frequency scalable Bloom filter (zFilter) Forwarding Node can not only improve the Forwarding performance, but also considerably reducing the power consumption of the router.

  • comparative study of power consumption of a netfpga based Forwarding Node in publish subscribe internet routing
    Computer Communications, 2014
    Co-Authors: Xing Zheng, Xiaojun Wang
    Abstract:

    Abstract Making the Internet more energy efficient is one of the objectives of future Internet research because of the rising energy cost and environmental concerns. As most Internet users are only interested in accessing information and not the physical location of it, there is also active research on evolving the current host-centric network architecture to an information-centric network (ICN) architecture, which also promises better support for security and mobility. This paper focuses on examining the power consumption of a routing Node in ICN. It is experimentally demonstrated that the Bloom filter based Forwarding Node in ICN is more energy efficient than the longest prefix match based Forwarding in the current host-centric network. The experiments were conducted on a Bloom filter (zFilter) Forwarding Node implemented on the open-source NetFPGA platform. The results in the paper show that using identical operation frequency and packet size of 60 bytes, the zFilter consumes less power than the IPv4 reference router by up to 3.5%. By reducing the operational core frequency, the zFilter at 62.5 MHz can reduce the total power by 9.9–13.8% and FPGA power by 17.8–26.1% compared to the reference router at 125 MHz, while still outperforming the reference router in terms of the packet loss and throughput. In addition, per packet energy consumption is evaluated for the zFilter and it is shown that the zFilter lowers the per packet energy consumption by up to 41.6% when compared with the IPv4 reference router.

  • Comparative study of power consumption of a NetFPGA-based Forwarding Node in publish–subscribe Internet routing
    Computer Communications, 2014
    Co-Authors: Xing Zheng, Xiaojun Wang
    Abstract:

    Abstract Making the Internet more energy efficient is one of the objectives of future Internet research because of the rising energy cost and environmental concerns. As most Internet users are only interested in accessing information and not the physical location of it, there is also active research on evolving the current host-centric network architecture to an information-centric network (ICN) architecture, which also promises better support for security and mobility. This paper focuses on examining the power consumption of a routing Node in ICN. It is experimentally demonstrated that the Bloom filter based Forwarding Node in ICN is more energy efficient than the longest prefix match based Forwarding in the current host-centric network. The experiments were conducted on a Bloom filter (zFilter) Forwarding Node implemented on the open-source NetFPGA platform. The results in the paper show that using identical operation frequency and packet size of 60 bytes, the zFilter consumes less power than the IPv4 reference router by up to 3.5%. By reducing the operational core frequency, the zFilter at 62.5 MHz can reduce the total power by 9.9–13.8% and FPGA power by 17.8–26.1% compared to the reference router at 125 MHz, while still outperforming the reference router in terms of the packet loss and throughput. In addition, per packet energy consumption is evaluated for the zFilter and it is shown that the zFilter lowers the per packet energy consumption by up to 41.6% when compared with the IPv4 reference router.

  • Power consumption in a zfilter publish/subscribe based Forwarding Node
    IET International Conference on Information and Communications Technologies (IETICT 2013), 2013
    Co-Authors: Tom Molloy, Xing Zheng, Olga Ormond, Feng Guo, Xiaojun Wang
    Abstract:

    In recent years, a new internet architecture based on the publish/subscribe paradigm has been adopted by organizations such as the FP7 EU project PSIRP (Publish/Subscribe Internet Paradigm) and its follow on FP7 EU project PURSUIT (Publish/Subscribe Internet Technology). Furthermore, a publish/subscribe based zFilter Forwarding Node has been developed and implemented on the NetFPGA platform. The zFilter Forwarding Node replaces IP Forwarding implementation with a bloom filter matching technique. In this study, it is described how as part of the FP7 EU project ECOnet, the zFilter Forwarding Node is investigated and its power consumption is compared with the that of the IP based reference router design under various traffic conditions. The major findings in the paper show that the zFilter Forwarding Node can consume 21.5%-26.15% less dynamic power than the IPv4 reference router while still maintaining a better performance in terms of throughput and packet loss.

Jin-young Choi - One of the best experts on this subject based on the ideXlab platform.

  • A medium access control scheme for providing reliability in wireless Ad Hoc networks
    Lecture Notes in Computer Science, 2006
    Co-Authors: Song-hee Lee, Jin-young Choi
    Abstract:

    We propose a medium access control (MAC) protocol called MMPR that supports reliable medium access control in wireless ad hoc networks. MMPR protocol focuses on interaction between a MAC and upper layers, whereby the MAC layer indirectly influences selection of the most reliable next Forwarding Node set by considering link channel states. The MMPR protocol reduces the number of contention phases and control frames using transmission power control techniques, considerably reducing the time required for broadcasting. In addition, our protocol increases throughput under channel fading and interference using a modified CSMA/CA scheme. Our simulation shows that MMPR is substantially more reliable and it provides high throughput in ad hoc network models compared to 802.11 broadcast and BMMM*.

L M Patnaik - One of the best experts on this subject based on the ideXlab platform.

  • rrdvcr real time reliable data delivery based on virtual coordinating routing for wireless sensor networks
    Journal of Computer Science, 2018
    Co-Authors: C S Sengar, K R Venugopal, S S Iyengar, L M Patnaik
    Abstract:

    Real-time industrial application requires a routing protocol that guarantees data delivery with reliable, efficient and low end-to-end delay. Existing Two-Hop Velocity based Routing (THVR) protocol relates two-hop velocity to end-to-end delay to select the next Forwarding Node, that has the overhead of exchanging control packets and depleting the available energy in Nodes. We propose a Real-Time Reliable Data delivery based on Virtual Coordinates Routing (RRDVCR) algorithm, based on the number of hops to the destination rather than geographic distance. Selection of Forwarding Node is based on packet progress offered by two-hops, link quality and available energy at the Forwarding Nodes. All these metric are co-related by dynamic co-relation factor. The proposed protocol uses a selective acknowledgment scheme that results in lower overhead and energy consumption. Simulation results show that there is about 22 and 9.5% decrease in energy consumption compared to SPEED  respectively, 16 and 38% increase in packet delivery compared to THVR and SPEED respectively and overhead is reduced by 50%.

  • rrdvcr real time reliable data delivery based on virtual coordinating routing for wireless sensor networks
    IEEE International Conference Computer and Communications, 2016
    Co-Authors: C S Sengar, K R Venugopal, S S Iyengar, L M Patnaik
    Abstract:

    Real-time industrial application requires routing protocol that guarantees data delivery with reliable, efficient and low end-to-end delay. Existing Routing(THVR) [13] is based velocity of Two-Hop Velocity and protocol relates two-hop velocity to delay to select the next Forwarding Node, that has overhead of exchanging control packets, and depleting the available energy in Nodes. We propose a Real-Time Reliable Data delivery based on Virtual Coordinates Routing (RRDVCR) algorithm, based on the number of hops to the destination rather than geographic distance. Selection of Forwarding Node is based on packet progress offered by two-hops, link quality and available energy at the Forwarding Nodes. All these metric are co-related by dynamic co-relation factor. The proposed protocol uses selective acknowledgment scheme that results in lower overhead and energy consumption. Simulation results shows that there is about 22% and 9.5% decrease in energy consumption compared to SPEED [8] and THVR [13] respectively, 16% and 38% increase in packet delivery compared to THVR [13] and SPEED [8] respectively, and overhead is reduced by 50%.