The Experts below are selected from a list of 24525 Experts worldwide ranked by ideXlab platform

Abbas Jamalipour - One of the best experts on this subject based on the ideXlab platform.

  • an implementation of multichannel multi interface manet for fire engines and experiments with winds satellite mobile earth station
    Wireless Communications and Networking Conference, 2016
    Co-Authors: Yasunori Owada, Norihiko Katayama, Byeongpyo Jeong, Kiyohiko Hattori, Kiyoshi Hamaguchiv, Masugi Inoue, Kenichi Takanashi, Masafumi Hosokawa, Abbas Jamalipour
    Abstract:

    We propose a novel communication system for an emergency fire response team, which provides Internet service on the way to and in the disaster area. The system is composed of a multi-interface mobile ad-hoc network (MANET) router, a Global Positioning System (GPS) receiver, and two Wi-Fi interfaces with directional antennas, which can be easily attached to the roof of a vehicle. The front-side Wi-Fi interface of the vehicle is operated in the Infrastructure Mode, and the rear-side interface is operated in the access point Mode. Different channels are assigned to each AP interface of the vehicles. Infrastructure-Mode Wi-Fi interfaces automatically scan and connect to an appropriate AP interface and create MANET links. Some experiments using this wireless system with the WINDS satellite mobile earth station and nine fire engines were conducted in Ebetsu, Hokkaido. We measured the TCP throughput and confirmed that a throughput of more than 10 Mbps was able to be obtained by most of the node pairs. In addition, high-vision video streaming was able to be successfully transmitted to the streaming server on the Internet through MANET and satellite communication links while they were platooning.

  • WCNC - An implementation of multichannel multi-interface MANET for fire engines and experiments with WINDS satellite mobile earth station
    2016 IEEE Wireless Communications and Networking Conference, 2016
    Co-Authors: Yasunori Owada, Norihiko Katayama, Byeongpyo Jeong, Kiyohiko Hattori, Kiyoshi Hamaguchiv, Masugi Inoue, Kenichi Takanashi, Masafumi Hosokawa, Abbas Jamalipour
    Abstract:

    We propose a novel communication system for an emergency fire response team, which provides Internet service on the way to and in the disaster area. The system is composed of a multi-interface mobile ad-hoc network (MANET) router, a Global Positioning System (GPS) receiver, and two Wi-Fi interfaces with directional antennas, which can be easily attached to the roof of a vehicle. The front-side Wi-Fi interface of the vehicle is operated in the Infrastructure Mode, and the rear-side interface is operated in the access point Mode. Different channels are assigned to each AP interface of the vehicles. Infrastructure-Mode Wi-Fi interfaces automatically scan and connect to an appropriate AP interface and create MANET links. Some experiments using this wireless system with the WINDS satellite mobile earth station and nine fire engines were conducted in Ebetsu, Hokkaido. We measured the TCP throughput and confirmed that a throughput of more than 10 Mbps was able to be obtained by most of the node pairs. In addition, high-vision video streaming was able to be successfully transmitted to the streaming server on the Internet through MANET and satellite communication links while they were platooning.

Tzi-cker Chiueh - One of the best experts on this subject based on the ideXlab platform.

  • passive and accurate traffic load estimation for Infrastructure Mode wireless lan
    Modeling Analysis and Simulation of Wireless and Mobile Systems, 2007
    Co-Authors: Tzi-cker Chiueh
    Abstract:

    The exponential increase in the deployment of IEEE 802.11-based wireless LAN (WLAN) technology has transformed it into an essential building block of the networking Infrastructure of commercial enterprises. How to effectively manage these WLAN networks and stop malicious intruders are the two main barriers for further spread of this technology. At the same time, the enormous economies of scale behind IEEE 802.11-based WLAN products also result in rapid technological advances and astounding pricing efficiencies. In this paper, we describe the design, implementation, and evaluation of a scalable wireless LAN traffic monitoring system called WIreless Network senTRY (Wintry), which provides real-time visibility of the usage of an enterprise's wireless links in a way that is completely transparent to the monitored WLAN networks. Moreover, Wintry is able to leverage low-cost programmable WLAN access points and reduce the total hardware cost to the minimum. A key feature of Wintry is an accurate radio channel busy time estimation algorithm that correctly takes into account both back-off delay and corrupted packets in WLAN traffic load computation without requiring any modification to monitored WLAN devices.

  • MSWiM - Passive and accurate traffic load estimation for Infrastructure-Mode wireless lan
    Proceedings of the 10th ACM Symposium on Modeling analysis and simulation of wireless and mobile systems - MSWiM '07, 2007
    Co-Authors: Tzi-cker Chiueh
    Abstract:

    The exponential increase in the deployment of IEEE 802.11-based wireless LAN (WLAN) technology has transformed it into an essential building block of the networking Infrastructure of commercial enterprises. How to effectively manage these WLAN networks and stop malicious intruders are the two main barriers for further spread of this technology. At the same time, the enormous economies of scale behind IEEE 802.11-based WLAN products also result in rapid technological advances and astounding pricing efficiencies. In this paper, we describe the design, implementation, and evaluation of a scalable wireless LAN traffic monitoring system called WIreless Network senTRY (Wintry), which provides real-time visibility of the usage of an enterprise's wireless links in a way that is completely transparent to the monitored WLAN networks. Moreover, Wintry is able to leverage low-cost programmable WLAN access points and reduce the total hardware cost to the minimum. A key feature of Wintry is an accurate radio channel busy time estimation algorithm that correctly takes into account both back-off delay and corrupted packets in WLAN traffic load computation without requiring any modification to monitored WLAN devices.

  • Low-latency mobile IP handoff for Infrastructure-Mode wireless LANs
    IEEE Journal on Selected Areas in Communications, 2004
    Co-Authors: Srikant Sharma, Ningning Zhu, Tzi-cker Chiueh
    Abstract:

    The increasing popularity of IEEE 802.11-based wireless local area networks (LANs) lends them credibility as a viable alternative to third-generation (3G) wireless technologies. Even though wireless LANs support much higher channel bandwidth than 3G networks, their network-layer handoff latency is still too high to be usable for interactive multimedia applications such as voice over IP or video streaming. Specifically, the peculiarities of commercially available IEEE 802.11b wireless LAN hardware prevent existing mobile Internet protocol (IP) implementations from achieving subsecond Mobile IP handoff latency when the wireless LANs are operating in the Infrastructure Mode, which is also the prevailing operating Mode used in most deployed IEEE 802.11b LANs. In this paper, we propose a low-latency mobile IP handoff scheme that can reduce the handoff latency of Infrastructure-Mode wireless LANs to less than 100 ms, the fastest known handoff performance for such networks. The proposed scheme overcomes the inability of mobility software to sense the signal strengths of multiple-access points when operating in an Infrastructure-Mode wireless LAN. It expedites link-layer handoff detection and speeds up network-layer handoff by replaying cached foreign agent advertisements. The proposed scheme strictly adheres to the mobile IP standard specification, and does not require any modifications to existing mobile IP implementations. That is, the proposed mechanism is completely transparent to the existing mobile IP software installed on mobile nodes and wired nodes. As a demonstration of this technology, we show how this low-latency handoff scheme together with a wireless LAN bandwidth guarantee mechanism supports undisrupted playback of remote video streams on mobile stations that are traveling across wireless LAN segments.

Arkady Zaslavsky - One of the best experts on this subject based on the ideXlab platform.

  • running variance metric for evaluating performance of wireless ip networks in the mobilecty testbed
    Testbeds and Research Infrastructures for the DEvelopment of NeTworks and COMmunities, 2005
    Co-Authors: Christer Ahlund, Robert Brannstrom, Arkady Zaslavsky
    Abstract:

    This paper proposes and analyzes a Running Variance Metric performance measurement of wireless local area networks and its formal aspects. Our approach evaluates the performance of wireless local area networks in Infrastructure Mode as well as in ad hoc Mode. The Running Variance Metric is used to discover relative traffic loads of available access-points/gateways at the network layer in order to provide connectivity to the wired network. The paper discusses a simulation study. The simulation results demonstrate the usefulness and efficiency of the Running Variance Metric to evaluate the utilization of available access-points/gateways. It is also shown that this metric can be used for hop-analysis in multihop ad hoc wireless networks.

  • TRIDENTCOM - Running variance metric for evaluating performance of wireless IP networks in the MobileCty testbed
    First International Conference on Testbeds and Research Infrastructures for the DEvelopment of NeTworks and COMmunities, 1
    Co-Authors: Christer Ahlund, Robert Brannstrom, Arkady Zaslavsky
    Abstract:

    This paper proposes and analyzes a Running Variance Metric performance measurement of wireless local area networks and its formal aspects. Our approach evaluates the performance of wireless local area networks in Infrastructure Mode as well as in ad hoc Mode. The Running Variance Metric is used to discover relative traffic loads of available access-points/gateways at the network layer in order to provide connectivity to the wired network. The paper discusses a simulation study. The simulation results demonstrate the usefulness and efficiency of the Running Variance Metric to evaluate the utilization of available access-points/gateways. It is also shown that this metric can be used for hop-analysis in multihop ad hoc wireless networks.

Junli Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Study of the TCP upstream/downstream unfairness issue with per-flow queuing over Infrastructure-Mode WLANs: Research Articles
    2005
    Co-Authors: Zhisheng Niu, Junli Zheng
    Abstract:

    Fairness is an important issue in WLANs due to their shared media nature. Essentially, IEEE 802.11 MAC protocols have been designed to provide fair access for all the competing mobile hosts. However, the fairness at MAC layer cannot be maintained at TCP layer in the presence of both mobile senders and receivers accessing to wired networks. In this paper, we investigate the TCP upstream/downstream unfairness issue over WLANs with per-flow queuing employed at the access point (AP). The interactions between the IEEE 802.11 MAC protocol and TCP are evaluated through analysis and simulation. Based on the derived analytical Model, an efficient solution is proposed to be implemented at the AP for fairness achievement. Copyright © 2005 John Wiley & Sons, Ltd.

  • study of the tcp upstream downstream unfairness issue with per flow queuing over Infrastructure Mode wlans
    Wireless Communications and Mobile Computing, 2005
    Co-Authors: Zhisheng Niu, Junli Zheng
    Abstract:

    Fairness is an important issue in WLANs due to their shared media nature. Essentially, IEEE 802.11 MAC protocols have been designed to provide fair access for all the competing mobile hosts. However, the fairness at MAC layer cannot be maintained at TCP layer in the presence of both mobile senders and receivers accessing to wired networks. In this paper, we investigate the TCP upstream/downstream unfairness issue over WLANs with per-flow queuing employed at the access point (AP). The interactions between the IEEE 802.11 MAC protocol and TCP are evaluated through analysis and simulation. Based on the derived analytical Model, an efficient solution is proposed to be implemented at the AP for fairness achievement. Copyright © 2005 John Wiley & Sons, Ltd.

  • Study of the TCP upstream/downstream unfairness issue with per‐flow queuing over Infrastructure‐Mode WLANs
    Wireless Communications and Mobile Computing, 2005
    Co-Authors: Zhisheng Niu, Junli Zheng
    Abstract:

    Fairness is an important issue in WLANs due to their shared media nature. Essentially, IEEE 802.11 MAC protocols have been designed to provide fair access for all the competing mobile hosts. However, the fairness at MAC layer cannot be maintained at TCP layer in the presence of both mobile senders and receivers accessing to wired networks. In this paper, we investigate the TCP upstream/downstream unfairness issue over WLANs with per-flow queuing employed at the access point (AP). The interactions between the IEEE 802.11 MAC protocol and TCP are evaluated through analysis and simulation. Based on the derived analytical Model, an efficient solution is proposed to be implemented at the AP for fairness achievement. Copyright © 2005 John Wiley & Sons, Ltd.

Yasunori Owada - One of the best experts on this subject based on the ideXlab platform.

  • an implementation of multichannel multi interface manet for fire engines and experiments with winds satellite mobile earth station
    Wireless Communications and Networking Conference, 2016
    Co-Authors: Yasunori Owada, Norihiko Katayama, Byeongpyo Jeong, Kiyohiko Hattori, Kiyoshi Hamaguchiv, Masugi Inoue, Kenichi Takanashi, Masafumi Hosokawa, Abbas Jamalipour
    Abstract:

    We propose a novel communication system for an emergency fire response team, which provides Internet service on the way to and in the disaster area. The system is composed of a multi-interface mobile ad-hoc network (MANET) router, a Global Positioning System (GPS) receiver, and two Wi-Fi interfaces with directional antennas, which can be easily attached to the roof of a vehicle. The front-side Wi-Fi interface of the vehicle is operated in the Infrastructure Mode, and the rear-side interface is operated in the access point Mode. Different channels are assigned to each AP interface of the vehicles. Infrastructure-Mode Wi-Fi interfaces automatically scan and connect to an appropriate AP interface and create MANET links. Some experiments using this wireless system with the WINDS satellite mobile earth station and nine fire engines were conducted in Ebetsu, Hokkaido. We measured the TCP throughput and confirmed that a throughput of more than 10 Mbps was able to be obtained by most of the node pairs. In addition, high-vision video streaming was able to be successfully transmitted to the streaming server on the Internet through MANET and satellite communication links while they were platooning.

  • WCNC - An implementation of multichannel multi-interface MANET for fire engines and experiments with WINDS satellite mobile earth station
    2016 IEEE Wireless Communications and Networking Conference, 2016
    Co-Authors: Yasunori Owada, Norihiko Katayama, Byeongpyo Jeong, Kiyohiko Hattori, Kiyoshi Hamaguchiv, Masugi Inoue, Kenichi Takanashi, Masafumi Hosokawa, Abbas Jamalipour
    Abstract:

    We propose a novel communication system for an emergency fire response team, which provides Internet service on the way to and in the disaster area. The system is composed of a multi-interface mobile ad-hoc network (MANET) router, a Global Positioning System (GPS) receiver, and two Wi-Fi interfaces with directional antennas, which can be easily attached to the roof of a vehicle. The front-side Wi-Fi interface of the vehicle is operated in the Infrastructure Mode, and the rear-side interface is operated in the access point Mode. Different channels are assigned to each AP interface of the vehicles. Infrastructure-Mode Wi-Fi interfaces automatically scan and connect to an appropriate AP interface and create MANET links. Some experiments using this wireless system with the WINDS satellite mobile earth station and nine fire engines were conducted in Ebetsu, Hokkaido. We measured the TCP throughput and confirmed that a throughput of more than 10 Mbps was able to be obtained by most of the node pairs. In addition, high-vision video streaming was able to be successfully transmitted to the streaming server on the Internet through MANET and satellite communication links while they were platooning.