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

  • A cooperative approach to fully utilizing the aggregate bandwidth of all Service Channels in IEEE 802.11p/1609 networks
    2013 IEEE Symposium on Computers and Communications (ISCC), 2013
    Co-Authors: S Y Wang, Hung-wei Chiu, Jie Zheng, Xiao Chen
    Abstract:

    The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. One control Channel and six Service Channels are used in such a network. Ideally, the data transmission load generated by all Service providers and their user stations should be spread over all of the six Service Channels evenly to fully utilize the aggregate bandwidth of these Service Channels. However, the IEEE 802.11p/1609 standards do not define a way to achieve this load-balancing goal. As a result, many Service providers may choose to use the same Service Channel and leave some Service Channels totally unused. This will cause heavy congestion on some Service Channels while wasting the bandwidth of unused Service Channels. To solve this problem, in this paper we propose a cooperative approach to fully utilizing the bandwidth of the six Service Channels in the IEEE 802.11p/1609 networks. In our approach, every Service provider collects and computes the current load of the Service Channel that it is using and shares the computed load information with other Service providers on the control Channel via its WSA control packets. With this global knowledge, each Service provider can choose to use an idle or lightly-used Service Channel to avoid heavy congestion. We used the EstiNet network simulator and emulator to conduct simulation studies. Our simulation results show that our approach significantly improves the utilization of the aggregate bandwidth of the six Service Channels by as high as 600%.

  • ISCC - A cooperative approach to fully utilizing the aggregate bandwidth of all Service Channels in IEEE 802.11p/1609 networks
    2013 IEEE Symposium on Computers and Communications (ISCC), 2013
    Co-Authors: S Y Wang, Hung-wei Chiu, Jie Zheng, Xiao Chen
    Abstract:

    The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. One control Channel and six Service Channels are used in such a network. Ideally, the data transmission load generated by all Service providers and their user stations should be spread over all of the six Service Channels evenly to fully utilize the aggregate bandwidth of these Service Channels. However, the IEEE 802.11p/1609 standards do not define a way to achieve this load-balancing goal. As a result, many Service providers may choose to use the same Service Channel and leave some Service Channels totally unused. This will cause heavy congestion on some Service Channels while wasting the bandwidth of unused Service Channels. To solve this problem, in this paper we propose a cooperative approach to fully utilizing the bandwidth of the six Service Channels in the IEEE 802.11p/1609 networks. In our approach, every Service provider collects and computes the current load of the Service Channel that it is using and shares the computed load information with other Service providers on the control Channel via its WSA control packets. With this global knowledge, each Service provider can choose to use an idle or lightly-used Service Channel to avoid heavy congestion. We used the EstiNet network simulator and emulator to conduct simulation studies. Our simulation results show that our approach significantly improves the utilization of the aggregate bandwidth of the six Service Channels by as high as 600%.

  • WCNC - Improving the Channel Utilization of IEEE 802.11p/1609 Networks
    2009 IEEE Wireless Communications and Networking Conference, 2009
    Co-Authors: S Y Wang, W. J. Hung, T. W. Ho, C. L. Chou, Chao-hua Huang, Hung-chun Chen
    Abstract:

    The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. A new operational mode, called theWAVE (Wireless Access in Vehicular Environments) mode, is defined to enable communication among high-speed vehicles or between a vehicle and a roadside infrastructure network. In the WAVE mode, a mobile/stationary station uses a combined FDMA/TDMA Channel access scheme to switch its Channel between the control Channel and a Service Channel every 50 ms. The primary purpose of this design is to detect new Services announced by other stations. However, if a station would like to use all of its Service Channel bandwidth to transmit a large volume of data to another station, switching back to the control Channel every 50 ms without doing anything useful only unnecessarily reduces the maximum possible transmission throughput by a half. To overcome this problem, in this paper we propose an improved Channel access scheme to allow a station to stay on a Service Channel as long as it requires before returning to the control Channel. Our simulation results show that the proposed scheme significantly improves the Service Channel utilization under various network conditions.

  • Improving the Channel utilization of IEEE 802.11p/1609 networks
    IEEE Wireless Communications and Networking Conference WCNC, 2009
    Co-Authors: S Y Wang, W. J. Hung, M. S. Hsu, T. W. Ho, K.c. Liu, C. F. Huang, H. Y. Chen, C.c. Lin
    Abstract:

    The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. A new operational mode, called the WAVE (Wireless Access in Vehicular Environments) mode, is defined to enable communication among high-speed vehicles or between a vehicle and a roadside infrastructure network. In the WAVE mode, a mobile/stationary station uses a combined FDMA/TDMA Channel access scheme to switch its Channel between the control Channel and a Service Channel every 50 ms. The primary purpose of this design is to detect new Services announced by other stations. However, it a station would like to use all of its Service Channel bandwidth to transmit a large volume of data to another station, switching back to the control Channel every 50 ms without doing anything useful only unnecessarily reduces the maximum possible transmission throughput by a half. To overcome this problem, in this paper we propose an improved Channel access scheme to allow a station to stay on a Service Channel as long as it requires before returning to the control Channel. Our simulation results show that the proposed scheme significantly improves the Service Channel utilization under various network conditions.

Antonella Molinaro - One of the best experts on this subject based on the ideXlab platform.

  • ICUMT - CRaSCH: A cooperative scheme for Service Channel reservation in 802.11p/WAVE vehicular ad hoc networks
    2009 International Conference on Ultra Modern Telecommunications & Workshops, 2009
    Co-Authors: Claudia Campolo, A. Cortese, Antonella Molinaro
    Abstract:

    IEEE 802.11p is an emerging standard intended to support wireless access in the vehicular environment and to deliver both safety and non-safety applications to vehicles on the roads. Despite the massive research effort related to the design of reliable and timely schemes for dissemination of safety messages, only a few works have investigated on-the-road delivery of non-safety data traffic, such as comfort and entertainment applications (e.g., multimedia, web browsing, e-mails, e-maps), by considering the standard features and capabilities. The IEEE802.11p/WAVE (Wireless Access for Vehicular Environment) standard foresees that safety and control messages are carried over a dedicated control Channel, while non safety messages can be delivered over one of a set of available Service Channels. In this paper, we propose a cooperative reservation scheme for Service Channels to be carried out by wireless nodes acting as WAVE providers. The proposal is fully compliant with the IEEE802.11p/WAVE standard and supports both V2I (Vehicle-to-Infrastructure) and V2V (Vehicle-to-Vehicle) communications. We expect that the cooperative scheme can outperform the legacy IEEE 802.11p/WAVE protocol, by reducing the cases where two or more providers choose the same Service Channel for non-safety traffic delivery. This would result in improved system performance without adversely affecting the delivery of safety applications on the control Channel.

  • crasch a cooperative scheme for Service Channel reservation in 802 11p wave vehicular ad hoc networks
    International Conference on Ultra Modern Telecommunications, 2009
    Co-Authors: Claudia Campolo, A. Cortese, Antonella Molinaro
    Abstract:

    IEEE 802.11p is an emerging standard intended to support wireless access in the vehicular environment and to deliver both safety and non-safety applications to vehicles on the roads. Despite the massive research effort related to the design of reliable and timely schemes for dissemination of safety messages, only a few works have investigated on-the-road delivery of non-safety data traffic, such as comfort and entertainment applications (e.g., multimedia, web browsing, e-mails, e-maps), by considering the standard features and capabilities. The IEEE802.11p/WAVE (Wireless Access for Vehicular Environment) standard foresees that safety and control messages are carried over a dedicated control Channel, while non safety messages can be delivered over one of a set of available Service Channels. In this paper, we propose a cooperative reservation scheme for Service Channels to be carried out by wireless nodes acting as WAVE providers. The proposal is fully compliant with the IEEE802.11p/WAVE standard and supports both V2I (Vehicle-to-Infrastructure) and V2V (Vehicle-to-Vehicle) communications. We expect that the cooperative scheme can outperform the legacy IEEE 802.11p/WAVE protocol, by reducing the cases where two or more providers choose the same Service Channel for non-safety traffic delivery. This would result in improved system performance without adversely affecting the delivery of safety applications on the control Channel.

  • VNC - Cooperative Service Channel reservation to improve performances of IEEE 802.11p/WAVE networks
    2009 IEEE Vehicular Networking Conference (VNC), 2009
    Co-Authors: Claudia Campolo, A. Cortese, Antonella Molinaro
    Abstract:

    The upcoming IEEE802.11p/WAVE (Wireless Access for Vehicular Environment) standard is intended to deliver both safety and non-safety applications to vehicles on the roads. Despite huge research on safety traffic, only a few works have investigated non-safety comfort and entertainment applications (e.g., multimedia, web browsing, e-maps) when considering the WAVE standard features and capabilities. In this paper, we focus on the effective transport of non-safety applications and design a cooperative scheme among WAVE Service providers for the reservation of non-interfering Channels dedicated to non-safety traffic. The proposal, which is fully compliant with the IEEE802.11p/WAVE standard, by lowering contention among providers, improves the performances of applications delivered over the Service Channels.

  • CRaSCH: A cooperative scheme for Service Channel reservation in 802.11p/WAVE vehicular ad hoc networks
    2009 International Conference on Ultra Modern Telecommunications and Workshops, 2009
    Co-Authors: Claudia Campolo, A. Cortese, Antonella Molinaro
    Abstract:

    IEEE 802.11p is an emerging standard intended to support wireless access in the vehicular environment and to deliver both safety and non-safety applications to vehicles on the roads. Despite the massive research effort related to the design of reliable and timely schemes for dissemination of safety messages, only a few works have investigated on-the-road delivery of non-safety data traffic, such as comfort and entertainment applications (e.g., multimedia, web browsing, e-mails, e-maps), by considering the standard features and capabilities. The IEEE802.11p/WAVE (Wireless Access for Vehicular En- vironment) standard foresees that safety and control messages are carried over a dedicated control Channel, while non safety messages can be delivered over one of a set of available Service Channels. In this paper, we propose a cooperative reservation scheme for Service Channels to be carried out by wireless nodes acting as WAVE providers. The proposal is fully compliant with the IEEE802.11p/WAVE standard and supports both V2I (Vehicle-to-Infrastructure) and V2V (Vehicle-to-Vehicle) commu- nications.We expect that the cooperative scheme can outperform the legacy IEEE 802.11p/WAVE protocol, by reducing the cases where two or more providers choose the same Service Channel for non-safety traffic delivery. This would result in improved system performance without adversely affecting the delivery of safety applications on the control Channel.

  • Cooperative Service Channel reservation to improve performances of IEEE 802.11p/WAVE networks
    2009 IEEE Vehicular Networking Conference (VNC), 2009
    Co-Authors: Claudia Campolo, A. Cortese, Antonella Molinaro
    Abstract:

    The upcoming IEEE802.11p/WAVE (wireless access for vehicular environment) standard is intended to deliver both safety and non-safety applications to vehicles on the roads. Despite huge research on safety traffic, only a few works have investigated non-safety comfort and entertainment applications (e.g., multimedia, web browsing, e-maps) when considering the WAVE standard features and capabilities. In this paper, we focus on the effective transport of non-safety applications and design a cooperative scheme among WAVE Service providers for the reservation of non-interfering Channels dedicated to non-safety traffic. The proposal, which is fully compliant with the IEEE802.11p/WAVE standard, by lowering contention among providers, improves the performances of applications delivered over the Service Channels.

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

  • Winter Simulation Conference - Optimal Service Channel reconfiguration based on multi-agent simulation
    2008 Winter Simulation Conference, 2008
    Co-Authors: Jin Yan Shao, Jin Dong
    Abstract:

    Solving the problem of long queues becomes increasingly urgent in many on-site Service outlets. For example, in a bank branch or a government agency, customers may have to wait for a very long time to be served. How to optimally reconfigure the capability of Service Channels in such outlets is a key for the Service providers to improve efficiency and quality of Service. In this paper, we propose a method to optimally configure Service Channels at a given Service outlet. We integrate customer experience metrics with cost and profit into a unified objective function for optimization. Multi-agent simulation technique is employed to model the stochastic Service processes and customer behavior, and to evaluate the objective function in optimizing Service Channel capacity. Some real-life data collected from bank branches provide significant empirical support to the method and demonstrate that the presented method is both effective and efficient.

  • Optimal Service Channel reconfiguration based on multi-agent simulation
    2008 Winter Simulation Conference, 2008
    Co-Authors: Jin Yan Shao, Jin Dong
    Abstract:

    Solving the problem of long queues becomes increasingly urgent in many on-site Service outlets. For example, in a bank branch or a government agency, customers may have to wait for a very long time to be served. How to optimally reconfigure the capability of Service Channels in such outlets is a key for the Service providers to improve efficiency and quality of Service. In this paper, we propose a method to optimally configure Service Channels at a given Service outlet. We integrate customer experience metrics with cost and profit into a unified objective function for optimization. Multi-agent simulation technique is employed to model the stochastic Service processes and customer behavior, and to evaluate the objective function in optimizing Service Channel capacity. Some real-life data collected from bank branches provide significant empirical support to the method and demonstrate that the presented method is both effective and efficient.

Yi Hu - One of the best experts on this subject based on the ideXlab platform.

  • An Improved Coordinated MultiChannel MAC Scheme by Efficient Use of Idle Service Channels for VANETs
    2018 IEEE 87th Vehicular Technology Conference (VTC Spring), 2018
    Co-Authors: Liu Yang, Sangsha Fang, Yi Hu
    Abstract:

    In this paper, an improved coordinated multiChannel media access control (IC-MAC) scheme by efficient use of idle Service Channels is proposed for vehicular ad-hoc networks (VANETs). Different from the existing coordinated multiChannel MAC (C-MAC) scheme based on IEEE 802.11p and 1609.4, an improved mechanism for Service Channel reservation and Service message transmission is introduced in the proposed IC-MAC schemes. With the proposed mechanism, the idle Service Channel of the reservation time can be used to transmit Service messages when the quality-of-Service (QoS) of safety messages is guaranteed. To evaluate the performance of the IC-MAC scheme, the throughput and delay of Service messages are derived. Simulation results demonstrate that the throughput and delay performance can be improved by using the proposed IC-MAC scheme.

  • VTC Spring - An Improved Coordinated MultiChannel MAC Scheme by Efficient Use of Idle Service Channels for VANETs
    2018 IEEE 87th Vehicular Technology Conference (VTC Spring), 2018
    Co-Authors: Yongfu Ma, Liu Yang, Sangsha Fang, Yi Hu
    Abstract:

    In this paper, an improved coordinated multiChannel media access control (IC-MAC) scheme by efficient use of idle Service Channels is proposed for vehicular ad-hoc networks (VANETs). Different from the existing coordinated multiChannel MAC (C-MAC) scheme based on IEEE 802.11p and 1609.4, an improved mechanism for Service Channel reservation and Service message transmission is introduced in the proposed IC-MAC schemes. With the proposed mechanism, the idle Service Channel of the reservation time can be used to transmit Service messages when the quality-of-Service (QoS) of safety messages is guaranteed. To evaluate the performance of the IC-MAC scheme, the throughput and delay of Service messages are derived. Simulation results demonstrate that the throughput and delay performance can be improved by using the proposed IC-MAC scheme.

Choong Seon Hong - One of the best experts on this subject based on the ideXlab platform.

  • An efficient and reliable MAC in VANETs
    IEEE Communications Letters, 2014
    Co-Authors: Duc Ngoc Minh Dang, Sungwon Lee, Choong Seon Hong, Eui-nam Huh
    Abstract:

    Vehicular Ad hoc Network (VANET) is developed to enhance the safety, comfort and efficiency of driving. The IEEE 802.11p/WAVE and IEEE 1609.4 family are standards intended to support wireless access in VANETs. In this paper, we propose an Efficient and Reliable MAC protocol for VANETs (VER-MAC) which allows nodes to broadcast safety packets twice during both the control Channel interval and Service Channel interval to increase the safety broadcast reliability. By using the additional data structures, nodes can transmit Service packets during the control Channel interval to improve the Service throughput.

  • An Enhanced Multi-Channel MAC for Vehicular Ad Hoc Networks
    2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013
    Co-Authors: Choong Seon Hong
    Abstract:

    The IEEE 1609.4 [1] is a MAC extension of IEEE 802.11p [2] to support multi-Channel operations. However, the IEEE 1609.4 does not allow nodes to exchange non-safety messages during the CCH interval. This paper proposes a Vehicular Enhanced Multi-Channel MAC protocol (VEMMAC) for Vehicular Ad hoc Networks (VANETs). The VEMMAC adopts the IEEE 1609.4 with alternating sequences of the Control Channel (CCH) interval and the Service Channel (SCH) interval. Different from the IEEE 1609.4, the VEMMAC allows nodes to transmit non-safety messages during CCH interval and broadcast safety messages twice with each in the CCH and SCH interval. Our proposal can utilize the Channel resources more efficiently than the IEEE 1609.4. The simulation results show that the proposed VEMMAC protocol achieves higher throughput for Service data and is more reliable for safety messages broadcast than other protocols. © 2013 IEEE.