The Experts below are selected from a list of 22740 Experts worldwide ranked by ideXlab platform
Yunhao Liu - One of the best experts on this subject based on the ideXlab platform.
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On Improving Wireless Channel Utilization: A Collision Tolerance-Based Approach
IEEE Transactions on Mobile Computing, 2017Co-Authors: Jiliang Wang, Daibo Liu, Yunhao LiuAbstract:Packet corruption caused by collision is a critical problem that hurts the performance of wireless networks. Conventional medium access control (MAC) protocols resort to collision avoidance to maintain acceptable efficiency of Channel Utilization. According to our investigation and observation, however, collision avoidance comes at the cost of miscellaneous overhead, which oppositely hurts Channel Utilization, not to mention the poor resiliency and performance of those protocols in face of dense networks or intensive traffic. Discovering the ability to tolerate collisions at the physical layer implementations of wireless networks, we in this paper propose $Coco$ , a protocol that advocates simultaneous accesses from multiple senders to a shared Channel, i.e., optimistically allowing collisions instead of simply avoiding them. With a simple but effective design, $Coco$ addresses the key challenges in achieving collision tolerance, such as precise sender alignment and the control of transmission concurrency. We implement $Coco$ in 802.15.4 networks and evaluate its performance through extensive experiments with 21 TelosB nodes. The results demonstrate that $Coco$ is light-weight and enhances Channel Utilization by at least $20\,\text{percent}$ in general cases, compared with state-of-the-arts protocols.
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voice over the dins improving wireless Channel Utilization with collision tolerance
International Conference on Network Protocols, 2013Co-Authors: Jiliang Wang, Yunhao LiuAbstract:Packet corruption caused by collision is a critical problem that hurts the performance of wireless networks. Conventional medium access control (MAC) protocols resort to collision avoidance to maintain acceptable efficiency of Channel Utilization. According to our investigation and observation, however, collision avoidance comes at the cost of miscellaneous overhead, which oppositely hurts Channel Utilization, not to mention the poor resiliency and performance of those protocols in face of dense networks or intensive traffic. Discovering the ability to tolerate collisions at the physical layer implementations of wireless networks, we in this paper propose Coco, a MAC protocol that advocates simultaneous accesses from multiple senders to a shared Channel, i.e., optimistically allowing collisions instead of simply avoiding them. With a simple but effective design, Coco addresses the key challenges in achieving collision tolerance, such as precise sender alignment and fine control of the transmission concurrency. We implement Coco in 802.15.4 networks and evaluate its performance through extensive experiments with 21 TelosB nodes. The results demonstrate that Coco is light-weight and enhances Channel Utilization by at least 20% in general cases, compared with state-of-the-arts protocols.
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MASS - STAGGER: Improving Channel Utilization for Convergecast in Wireless Sensor Networks
2013 IEEE 10th International Conference on Mobile Ad-Hoc and Sensor Systems, 2013Co-Authors: Jiliang Wang, Wei Dong, Yunhao LiuAbstract:Channel Utilization for wireless sensor networks is far from efficient, especially for convergecast in which multiple nodes are sending packets to a receiver. In this paper, we analyze the Channel Utilization when multiple nodes contend for the Channel in convergecast and show that Channel Utilization can be improved by accumulating packets on each node. However, the number of accumulated packets should be carefully determined. Otherwise, the system performance may not be improved or even be degraded, e.g., incurring additional packet delay. Based on the analysis result, we present STAGGER to achieve Channel Utilization improvement while guarantee the worst case performance. We implement STAGGER in TinyOS 2.1 and evaluate its performance on TelosB nodes. STAGGER only uses local information to determine the number of accumulated packets without incurring additional overhead. It adopts CSMA at the low level and preserves its nice properties, e.g., fairness. The experimental results show that the design can significantly improve the per-hop throughput and reduce packet loss ratio under high traffic rate.
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ICNP - Voice over the dins: Improving wireless Channel Utilization with collision tolerance
2013 21st IEEE International Conference on Network Protocols (ICNP), 2013Co-Authors: Jiliang Wang, Yunhao LiuAbstract:Packet corruption caused by collision is a critical problem that hurts the performance of wireless networks. Conventional medium access control (MAC) protocols resort to collision avoidance to maintain acceptable efficiency of Channel Utilization. According to our investigation and observation, however, collision avoidance comes at the cost of miscellaneous overhead, which oppositely hurts Channel Utilization, not to mention the poor resiliency and performance of those protocols in face of dense networks or intensive traffic. Discovering the ability to tolerate collisions at the physical layer implementations of wireless networks, we in this paper propose Coco, a MAC protocol that advocates simultaneous accesses from multiple senders to a shared Channel, i.e., optimistically allowing collisions instead of simply avoiding them. With a simple but effective design, Coco addresses the key challenges in achieving collision tolerance, such as precise sender alignment and fine control of the transmission concurrency. We implement Coco in 802.15.4 networks and evaluate its performance through extensive experiments with 21 TelosB nodes. The results demonstrate that Coco is light-weight and enhances Channel Utilization by at least 20% in general cases, compared with state-of-the-arts protocols.
Jiliang Wang - One of the best experts on this subject based on the ideXlab platform.
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On Improving Wireless Channel Utilization: A Collision Tolerance-Based Approach
IEEE Transactions on Mobile Computing, 2017Co-Authors: Jiliang Wang, Daibo Liu, Yunhao LiuAbstract:Packet corruption caused by collision is a critical problem that hurts the performance of wireless networks. Conventional medium access control (MAC) protocols resort to collision avoidance to maintain acceptable efficiency of Channel Utilization. According to our investigation and observation, however, collision avoidance comes at the cost of miscellaneous overhead, which oppositely hurts Channel Utilization, not to mention the poor resiliency and performance of those protocols in face of dense networks or intensive traffic. Discovering the ability to tolerate collisions at the physical layer implementations of wireless networks, we in this paper propose $Coco$ , a protocol that advocates simultaneous accesses from multiple senders to a shared Channel, i.e., optimistically allowing collisions instead of simply avoiding them. With a simple but effective design, $Coco$ addresses the key challenges in achieving collision tolerance, such as precise sender alignment and the control of transmission concurrency. We implement $Coco$ in 802.15.4 networks and evaluate its performance through extensive experiments with 21 TelosB nodes. The results demonstrate that $Coco$ is light-weight and enhances Channel Utilization by at least $20\,\text{percent}$ in general cases, compared with state-of-the-arts protocols.
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voice over the dins improving wireless Channel Utilization with collision tolerance
International Conference on Network Protocols, 2013Co-Authors: Jiliang Wang, Yunhao LiuAbstract:Packet corruption caused by collision is a critical problem that hurts the performance of wireless networks. Conventional medium access control (MAC) protocols resort to collision avoidance to maintain acceptable efficiency of Channel Utilization. According to our investigation and observation, however, collision avoidance comes at the cost of miscellaneous overhead, which oppositely hurts Channel Utilization, not to mention the poor resiliency and performance of those protocols in face of dense networks or intensive traffic. Discovering the ability to tolerate collisions at the physical layer implementations of wireless networks, we in this paper propose Coco, a MAC protocol that advocates simultaneous accesses from multiple senders to a shared Channel, i.e., optimistically allowing collisions instead of simply avoiding them. With a simple but effective design, Coco addresses the key challenges in achieving collision tolerance, such as precise sender alignment and fine control of the transmission concurrency. We implement Coco in 802.15.4 networks and evaluate its performance through extensive experiments with 21 TelosB nodes. The results demonstrate that Coco is light-weight and enhances Channel Utilization by at least 20% in general cases, compared with state-of-the-arts protocols.
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MASS - STAGGER: Improving Channel Utilization for Convergecast in Wireless Sensor Networks
2013 IEEE 10th International Conference on Mobile Ad-Hoc and Sensor Systems, 2013Co-Authors: Jiliang Wang, Wei Dong, Yunhao LiuAbstract:Channel Utilization for wireless sensor networks is far from efficient, especially for convergecast in which multiple nodes are sending packets to a receiver. In this paper, we analyze the Channel Utilization when multiple nodes contend for the Channel in convergecast and show that Channel Utilization can be improved by accumulating packets on each node. However, the number of accumulated packets should be carefully determined. Otherwise, the system performance may not be improved or even be degraded, e.g., incurring additional packet delay. Based on the analysis result, we present STAGGER to achieve Channel Utilization improvement while guarantee the worst case performance. We implement STAGGER in TinyOS 2.1 and evaluate its performance on TelosB nodes. STAGGER only uses local information to determine the number of accumulated packets without incurring additional overhead. It adopts CSMA at the low level and preserves its nice properties, e.g., fairness. The experimental results show that the design can significantly improve the per-hop throughput and reduce packet loss ratio under high traffic rate.
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ICNP - Voice over the dins: Improving wireless Channel Utilization with collision tolerance
2013 21st IEEE International Conference on Network Protocols (ICNP), 2013Co-Authors: Jiliang Wang, Yunhao LiuAbstract:Packet corruption caused by collision is a critical problem that hurts the performance of wireless networks. Conventional medium access control (MAC) protocols resort to collision avoidance to maintain acceptable efficiency of Channel Utilization. According to our investigation and observation, however, collision avoidance comes at the cost of miscellaneous overhead, which oppositely hurts Channel Utilization, not to mention the poor resiliency and performance of those protocols in face of dense networks or intensive traffic. Discovering the ability to tolerate collisions at the physical layer implementations of wireless networks, we in this paper propose Coco, a MAC protocol that advocates simultaneous accesses from multiple senders to a shared Channel, i.e., optimistically allowing collisions instead of simply avoiding them. With a simple but effective design, Coco addresses the key challenges in achieving collision tolerance, such as precise sender alignment and fine control of the transmission concurrency. We implement Coco in 802.15.4 networks and evaluate its performance through extensive experiments with 21 TelosB nodes. The results demonstrate that Coco is light-weight and enhances Channel Utilization by at least 20% in general cases, compared with state-of-the-arts protocols.
Q. Wang - One of the best experts on this subject based on the ideXlab platform.
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Maximization of the Channel Utilization in wireless heterogeneous multiaccess networks
IEEE Transactions on Vehicular Technology, 1997Co-Authors: Q. WangAbstract:The key aspect of personal communication services (PCS) is wireless access through local and wide area networks where there may exist a variety of services having different rates and diverse quality-of-service (QOS) requirements. This paper addresses the problem of maximizing the Channel Utilization in a wireless heterogeneous network with finite population. Slotted ALOHA with packet capture is used as the multiaccess protocol in the presence of background noise and Rayleigh fading. It is known that the capture effect, while significantly increasing the network throughput, causes unfairness among users in a heterogeneous network. To take fairness into consideration, individual throughput is used as the constraint with the Channel Utilization being the maximization objective. The maximization problem is then studied under various conditions by controlling the transmission power and/or probability. It is shown that for a narrow-band system under equal individual throughput requirement, transmission probability control is more effective than power control, and when a joint control strategy is employed, perfect or near perfect Channel Utilization can be achieved in the absence or presence of Rayleigh fading.
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Maximization of the Channel Utilization in wireless heterogeneous multi-access networks
Proceedings of ICUPC - 5th International Conference on Universal Personal Communications, 1Co-Authors: Q. WangAbstract:This paper addresses the problem of maximizing the Channel Utilization in a wireless heterogeneous network with finite population. Slotted ALOHA is used as the multi-access protocol with packet capture in the presence of background noise and Rayleigh fading. To take account of unfairness caused by capture effect, throughputs of individual users are used as constraints in the problem with network throughput being the maximization objective. The problem is then studied under various conditions by controlling transmission power and/or probability. It is shown that for a narrow-band system under equal throughput requirement, transmission probability control is more effective than power control, and when a joint control strategy is employed, perfect or near perfect Channel Utilization can be achieved in the absence or presence of Rayleigh fading.
K.g. Shin - One of the best experts on this subject based on the ideXlab platform.
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Achieving efficient Channel Utilization and weighted fairness for data communications in IEEE 802.11 WLAN under the DCF
IEEE 2002 Tenth IEEE International Workshop on Quality of Service (Cat. No.02EX564), 2002Co-Authors: Daji Qiao, K.g. ShinAbstract:Fair allocation of bandwidth and maximization of Channel Utilization are two important issues when designing a contention-based wireless medium access control (MAC) protocol. However, achieving both design goals at the same time is very difficult, and has not yet been addressed elsewhere. We study this challenging problem, particularly for data communications in IEEE 802.11 wireless local area networks (WLANs). We propose a priority-based fair medium access control (P-MAC) protocol by modifying the distributed coordination function (DCF) of the IEEE 802.11 MAC. The key idea is that the contention window size for each wireless station is properly selected to reflect: (1) the relative weights among data traffic flows, so as to achieve the weighted fairness; (2) the number of stations contending for the wireless medium, so as to maximize the aggregate throughput. In P-MAC, our approximations to the optimal contention window sizes, which are based on a theoretical analysis, are evaluated numerically and shown to work well under different network configurations and traffic scenarios. Moreover, simulation results show that, with few changes to the original DCF, P-MAC performs significantly better in terms of both fairness and throughput.
Ping Wang - One of the best experts on this subject based on the ideXlab platform.
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an efficient Channel Utilization scheme for wia pa industrial wireless networks based on link skipping
Green Computing and Communications, 2016Co-Authors: Heng Wang, Lun Shao, Shuyang Xia, Ping WangAbstract:WIA-PA (Wireless Networks for Industrial Automation-Process Automation) standard has become one of the three major IEC (International Electrotechnical Commission) standards for industrial wireless networks technology, and multi-Channel frequency hopping mechanism is significant for the performance of WIA-PA networks. Existing AFH (adaptive frequency hopping) mechanism for WIA-PA networks is based on retransmissions and requires multiple interactions, including notifications and acknowledgements. It increases the complexity and resource consumption of the networks. To solve the problem, we consider an efficient Channel Utilization scheme based on link skipping. In our proposed scheme, Channel conditions are evaluated from Channel history information in three levels: single point level, cluster level and whole network level, and then the network devices synthesize the evaluation results and skip the interfered links flexibly before transmitting packets. Experimental results verify that the proposed scheme decreases the packet loss probability, as well as accelerates the reaction time of Channel interference appearance effectively.
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iThings/GreenCom/CPSCom/SmartData - An Efficient Channel Utilization Scheme for WIA-PA Industrial Wireless Networks Based on Link Skipping
2016 IEEE International Conference on Internet of Things (iThings) and IEEE Green Computing and Communications (GreenCom) and IEEE Cyber Physical and , 2016Co-Authors: Heng Wang, Lun Shao, Xia Shuyang, Ping WangAbstract:WIA-PA (Wireless Networks for Industrial Automation-Process Automation) standard has become one of the three major IEC (International Electrotechnical Commission) standards for industrial wireless networks technology, and multi-Channel frequency hopping mechanism is significant for the performance of WIA-PA networks. Existing AFH (adaptive frequency hopping) mechanism for WIA-PA networks is based on retransmissions and requires multiple interactions, including notifications and acknowledgements. It increases the complexity and resource consumption of the networks. To solve the problem, we consider an efficient Channel Utilization scheme based on link skipping. In our proposed scheme, Channel conditions are evaluated from Channel history information in three levels: single point level, cluster level and whole network level, and then the network devices synthesize the evaluation results and skip the interfered links flexibly before transmitting packets. Experimental results verify that the proposed scheme decreases the packet loss probability, as well as accelerates the reaction time of Channel interference appearance effectively.