The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

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

  • analysis of Collision Probability in vehicular ad hoc networks
    Genetic and Evolutionary Computation Conference, 2009
    Co-Authors: Xun Guo, Yang Yang
    Abstract:

    Vehicular Ad Hoc Network (VANET) is a new type of ad hoc network with the characteristics of highly dynamic topology, variable vehicle velocity and density. In the performance evaluation of VANETs, traditional Collision Probability model is not suitable because it poorly reflects these characteristics. However, Collision Probability is a vital ingredient for any performance evaluation in IEEE 802.11 system. In order to get more accurate results of VANETsýý performance evaluation, a new model to estimate the Collision Probability in VANETs is proposed in this paper, which integrated the traditional model with the characteristics of VANETs. The model shows that the Collision Probability in VANETs is no longer a constant value as in traditional model, but a function of the factors reflecting the characteristics of VANETs. It increases along with the increasing of vehicle velocity or vehicle density. Simulation results using Network Simulator 2 (ns-2) show the validity and accuracy of the proposed model.

  • GEC Summit - Analysis of Collision Probability in vehicular ad hoc networks
    Proceedings of the first ACM SIGEVO Summit on Genetic and Evolutionary Computation - GEC '09, 2009
    Co-Authors: Xun Guo, Yang Yang
    Abstract:

    Vehicular Ad Hoc Network (VANET) is a new type of ad hoc network with the characteristics of highly dynamic topology, variable vehicle velocity and density. In the performance evaluation of VANETs, traditional Collision Probability model is not suitable because it poorly reflects these characteristics. However, Collision Probability is a vital ingredient for any performance evaluation in IEEE 802.11 system. In order to get more accurate results of VANETsýý performance evaluation, a new model to estimate the Collision Probability in VANETs is proposed in this paper, which integrated the traditional model with the characteristics of VANETs. The model shows that the Collision Probability in VANETs is no longer a constant value as in traditional model, but a function of the factors reflecting the characteristics of VANETs. It increases along with the increasing of vehicle velocity or vehicle density. Simulation results using Network Simulator 2 (ns-2) show the validity and accuracy of the proposed model.

Fangching Ren - One of the best experts on this subject based on the ideXlab platform.

  • rach Collision Probability for machine type communications
    Vehicular Technology Conference, 2012
    Co-Authors: Rayguang Cheng, Chiahung Wei, Shiaoli Tsao, Fangching Ren
    Abstract:

    This paper summarizes the two definitions of the Collision Probability from the perspective of an MTC device and an RAO were presented in 3GPP TR 37.868. We use the results presented in TR 37.868 to show the inconsistency between the two definitions. It worth to note that the researcher needs to clearly specify the definition they used in presenting the results of their proposed radio access network overload control schemes. This paper further presents an analytical model to derive the Collision Probability, the success Probability, and the idle Probability based on the two definitions.

  • VTC Spring - RACH Collision Probability for Machine-Type Communications
    2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 2012
    Co-Authors: Rayguang Cheng, Chiahung Wei, Shiaoli Tsao, Fangching Ren
    Abstract:

    This paper summarizes the two definitions of the Collision Probability from the perspective of an MTC device and an RAO were presented in 3GPP TR 37.868. We use the results presented in TR 37.868 to show the inconsistency between the two definitions. It worth to note that the researcher needs to clearly specify the definition they used in presenting the results of their proposed radio access network overload control schemes. This paper further presents an analytical model to derive the Collision Probability, the success Probability, and the idle Probability based on the two definitions.

Xun Guo - One of the best experts on this subject based on the ideXlab platform.

  • analysis of Collision Probability in vehicular ad hoc networks
    Genetic and Evolutionary Computation Conference, 2009
    Co-Authors: Xun Guo, Yang Yang
    Abstract:

    Vehicular Ad Hoc Network (VANET) is a new type of ad hoc network with the characteristics of highly dynamic topology, variable vehicle velocity and density. In the performance evaluation of VANETs, traditional Collision Probability model is not suitable because it poorly reflects these characteristics. However, Collision Probability is a vital ingredient for any performance evaluation in IEEE 802.11 system. In order to get more accurate results of VANETsýý performance evaluation, a new model to estimate the Collision Probability in VANETs is proposed in this paper, which integrated the traditional model with the characteristics of VANETs. The model shows that the Collision Probability in VANETs is no longer a constant value as in traditional model, but a function of the factors reflecting the characteristics of VANETs. It increases along with the increasing of vehicle velocity or vehicle density. Simulation results using Network Simulator 2 (ns-2) show the validity and accuracy of the proposed model.

  • GEC Summit - Analysis of Collision Probability in vehicular ad hoc networks
    Proceedings of the first ACM SIGEVO Summit on Genetic and Evolutionary Computation - GEC '09, 2009
    Co-Authors: Xun Guo, Yang Yang
    Abstract:

    Vehicular Ad Hoc Network (VANET) is a new type of ad hoc network with the characteristics of highly dynamic topology, variable vehicle velocity and density. In the performance evaluation of VANETs, traditional Collision Probability model is not suitable because it poorly reflects these characteristics. However, Collision Probability is a vital ingredient for any performance evaluation in IEEE 802.11 system. In order to get more accurate results of VANETsýý performance evaluation, a new model to estimate the Collision Probability in VANETs is proposed in this paper, which integrated the traditional model with the characteristics of VANETs. The model shows that the Collision Probability in VANETs is no longer a constant value as in traditional model, but a function of the factors reflecting the characteristics of VANETs. It increases along with the increasing of vehicle velocity or vehicle density. Simulation results using Network Simulator 2 (ns-2) show the validity and accuracy of the proposed model.

Rayguang Cheng - One of the best experts on this subject based on the ideXlab platform.

  • rach Collision Probability for machine type communications
    Vehicular Technology Conference, 2012
    Co-Authors: Rayguang Cheng, Chiahung Wei, Shiaoli Tsao, Fangching Ren
    Abstract:

    This paper summarizes the two definitions of the Collision Probability from the perspective of an MTC device and an RAO were presented in 3GPP TR 37.868. We use the results presented in TR 37.868 to show the inconsistency between the two definitions. It worth to note that the researcher needs to clearly specify the definition they used in presenting the results of their proposed radio access network overload control schemes. This paper further presents an analytical model to derive the Collision Probability, the success Probability, and the idle Probability based on the two definitions.

  • VTC Spring - RACH Collision Probability for Machine-Type Communications
    2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 2012
    Co-Authors: Rayguang Cheng, Chiahung Wei, Shiaoli Tsao, Fangching Ren
    Abstract:

    This paper summarizes the two definitions of the Collision Probability from the perspective of an MTC device and an RAO were presented in 3GPP TR 37.868. We use the results presented in TR 37.868 to show the inconsistency between the two definitions. It worth to note that the researcher needs to clearly specify the definition they used in presenting the results of their proposed radio access network overload control schemes. This paper further presents an analytical model to derive the Collision Probability, the success Probability, and the idle Probability based on the two definitions.

Liang Qian - One of the best experts on this subject based on the ideXlab platform.

  • signal strength assistant grouping for lower hidden node Collision Probability in 802 11ah
    International Conference on Wireless Communications and Signal Processing, 2017
    Co-Authors: Laipeng Zhang, Zhe Guo, Lianghui Ding, Feng Yang, Liang Qian
    Abstract:

    Recently, 802.11ah with restricted access window for Collision attenuation has been proposed for Internet of Things (IoT) applications. Random grouping of nodes in different access window is utilized to reduce the hidden node Collision Probability. However, when the coverage area of the sink node is large, the occurrence Probability of hidden node problem is still high and severely impacts the system energy efficiency. Hence, in this paper, we propose a Signal Strength Assistant (SSA) grouping scheme to further alleviate this problem. In the proposed SSA grouping, several Reference Nodes (RN) with known locations are installed in the application scenario evenly. RNs sequentially transmit beacon signals, while the normal nodes monitor the signal strength from different RNs and join the group identified by the RN with the strongest average signal strength. We formulate the analytical model of the hidden node Collision Probability in SSA and analyze the optimal number of RN nodes to satisfy specific hidden node Collision Probability requirement. Furthermore, the performance of SSA is evaluated through extensive simulation. It is shown that mathematical and simulation results of SSA match well and the proposed SSA grouping can significantly reduce the hidden node Collision Probability in 802.11ah.

  • WCSP - Signal strength assistant grouping for lower hidden node Collision Probability in 802.11ah
    2017 9th International Conference on Wireless Communications and Signal Processing (WCSP), 2017
    Co-Authors: Laipeng Zhang, Zhe Guo, Lianghui Ding, Feng Yang, Liang Qian
    Abstract:

    Recently, 802.11ah with restricted access window for Collision attenuation has been proposed for Internet of Things (IoT) applications. Random grouping of nodes in different access window is utilized to reduce the hidden node Collision Probability. However, when the coverage area of the sink node is large, the occurrence Probability of hidden node problem is still high and severely impacts the system energy efficiency. Hence, in this paper, we propose a Signal Strength Assistant (SSA) grouping scheme to further alleviate this problem. In the proposed SSA grouping, several Reference Nodes (RN) with known locations are installed in the application scenario evenly. RNs sequentially transmit beacon signals, while the normal nodes monitor the signal strength from different RNs and join the group identified by the RN with the strongest average signal strength. We formulate the analytical model of the hidden node Collision Probability in SSA and analyze the optimal number of RN nodes to satisfy specific hidden node Collision Probability requirement. Furthermore, the performance of SSA is evaluated through extensive simulation. It is shown that mathematical and simulation results of SSA match well and the proposed SSA grouping can significantly reduce the hidden node Collision Probability in 802.11ah.