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2017 9th International Conference on Communication Systems and Networks (COMSNETS)最新文献

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Sequential cooperative spectrum sensing in cognitive radio networks: Optimal selection of secondary users and their spectral measurements 认知无线电网络中的顺序协同频谱感知:二次用户的最佳选择及其频谱测量
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945394
L. Pillutla, Bhuvan Joshi
In this paper we consider the problem of spectrum sensing in cognitive radio networks which involves detection of primary (licensed) users (PUs) by secondary (unlicensed) users (SUs), who are interested in transmitting their data opportunistically. To facilitate accurate detection of PUs by the fusion center (FC) based on the energy measurements received from the chosen set of SUs, we formulate an optimization problem for selection of SUs and the number of samples they need to collect of the underlying spectrum. By assuming that the FC uses a sequential probability ratio test (SPRT) for performing spectrum sensing we formulate the problem of joint optimization over subset of SUs and the number of samples each of the SU in the chosen subset needs to collect, so that a composite cost function is maximized. For the computation of the optimal subset of SUs and the number of samples each SU has to collect we propose an algorithm based on DSO, in which optimization over the subset of SUs and the number of samples is done successively till convergence to the optimal set of values is achieved. Our simulation results demonstrate the efficacy of the proposed optimization approach based on SPRT as against that of a fixed sample size test at the FC. Specifically, the average number of samples required for an SPRT is much lower than that of a fixed sample size test for given values of probability of detection and probability of false alarm. The simulation results also confirm tracking ability of the proposed DSO based algorithms, in response to variations in the corresponding channel gains between the SUs and the FC.
在本文中,我们考虑了认知无线电网络中的频谱感知问题,该问题涉及到次要(未授权)用户(SUs)对主(许可)用户(pu)的检测,这些用户对机会主义地传输数据感兴趣。为了方便融合中心(FC)根据从所选的su集合接收到的能量测量准确检测pu,我们制定了一个su选择及其需要收集的底层光谱样品数量的优化问题。通过假设FC使用序列概率比测试(SPRT)进行频谱感知,我们制定了SU子集的联合优化问题以及所选子集中的每个SU需要收集的样本数量,从而使复合代价函数最大化。对于SU的最优子集和每个SU需要收集的样本数量的计算,我们提出了一种基于DSO的算法,该算法在SU的子集和样本数量上依次进行优化,直到收敛到最优值集。我们的仿真结果证明了所提出的基于SPRT的优化方法的有效性,而不是在FC进行固定样本量的测试。具体而言,对于给定的检测概率和虚警概率值,SPRT所需的平均样本数量远低于固定样本量的测试。仿真结果还证实了所提出的基于DSO的算法在响应su和FC之间相应信道增益变化时的跟踪能力。
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引用次数: 0
SDN-based dynamic flow scheduling in optical data centers 基于sdn的光数据中心动态流调度
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945376
S. Girisankar, Tram Truong Huu, G. Mohan
Wavelength division multiplexing (WDM) based optical networks have been shown to be an attractive “green” solution for cloud data center networks because of its high bisection bandwidth, low power consumption and low complexity of network wiring. In addition to the circuit-switched nature of optical networks, the high degree of the optical switch and dynamic arrival of traffic flows make the problem of flow scheduling in optical data centers becomes very challenging. It has to consider not only the flow admission control but also wavelength assignment for the lightpaths. In this paper, we address the problem of flow scheduling in optical data centers. We first develop an optimization programming formulation that aims at maximizing the revenue for cloud providers in a long run. Since solving the optimization formulation is computationally prohibitive, we develop heuristic scheduling algorithms based on the congestion factor of traffic flows. We design a Software Defined Network framework that integrates the proposed algorithms to perform flow scheduling in optical data center networks. We evaluate the proposed algorithms through comprehensive simulations and compare their performance against that of a baseline algorithm. The results show that the proposed algorithms achieve good performance improvement compared to the baseline algorithm.
基于波分复用(WDM)的光网络由于其高对分带宽、低功耗和低网络布线复杂性,已被证明是云数据中心网络的一种有吸引力的“绿色”解决方案。除了光网络的电路交换特性外,光交换的高度和流量的动态到达使得光数据中心的流量调度问题变得非常具有挑战性。它不仅要考虑进流控制,而且要考虑光路的波长分配。本文研究了光数据中心的流调度问题。我们首先开发了一个优化规划公式,旨在使云提供商的长期收益最大化。由于求解优化公式在计算上是禁止的,我们开发了基于交通流拥挤系数的启发式调度算法。我们设计了一个软件定义网络框架,该框架集成了所提出的算法来执行光数据中心网络中的流调度。我们通过综合模拟来评估所提出的算法,并将其性能与基线算法进行比较。结果表明,与基线算法相比,本文提出的算法取得了较好的性能提升。
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引用次数: 4
μPnP-WAN: Experiences with LoRa and its deployment in DR Congo μPnP-WAN: LoRa的经验及其在刚果民主共和国的部署
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945359
G. Ramachandran, F. Yang, Piers W. Lawrence, Sam Michiels, W. Joosen, D. Hughes
The Internet of Things (IoT) is being applied in a wide variety of applications, which demand a range of networking support. This includes wide area communication networks. Novel long range network technologies such as LoRa and Sigfox are emerging, but they remain difficult to deploy and configure for end-users who are not specialists in embedded systems. This paper addresses this problem by introducing μPnP-WAN, which combines the ease of use of the μPnP peripheral system, with the long range LoRa network to realise the first true plug-and-play solution for long-range sensing and actuation. Our evaluation shows that μPnP-WAN can achieve a range of up to 3.5 kilometers in ad-hoc suburban deployments and multi-year battery lifetime. Furthermore, our deployment of μPnP-WAN device in DR Congo to monitor the temperature of blood fridges shows the effectiveness of μPnP-WAN device in real-world application scenarios.
物联网(IoT)正被应用于各种各样的应用中,这些应用需要一系列的网络支持。这包括广域通信网络。LoRa和Sigfox等新型远程网络技术正在兴起,但对于不是嵌入式系统专家的最终用户来说,它们仍然难以部署和配置。本文通过引入μPnP- wan解决了这个问题,它结合了μPnP外设系统的易用性和远程LoRa网络,实现了第一个真正的即插即用的远程传感和驱动解决方案。我们的评估表明,μPnP-WAN可以在临时郊区部署中实现高达3.5公里的范围和多年的电池寿命。此外,我们在刚果民主共和国部署的μPnP-WAN设备用于监测血液冰箱的温度,显示了μPnP-WAN设备在实际应用场景中的有效性。
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引用次数: 22
Interference reduction by switching the underlaying transmitter in D2D communications 通过切换D2D通信中的底层发射机来减少干扰
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945421
Chaudhari Mahesh Shamrao, Prashant Kumar, Preetam Kumar
Enabling the device-to-device (D2D) communication in the cellular network (CN) induces the problem of interference. This paper proposes a scheme of controlling the power of the D2D user equipments (DUEs) by switching D2D transmitter on the basis of receiver-sensitivity. The performance of the proposed scheme has been evaluated in slow fading environment, with the assumptions that the proximity gains, instantaneous gains between base station (BS) and mobile user equipments (UEs) is available at the BS and that the D2D users (DUs) are moving slowly. It has been shown that the cell sum-rate increases significantly compared to conventional CN infrastructure without degrading the performance of the cellular users.
在蜂窝网络(CN)中启用设备对设备(D2D)通信会引起干扰问题。本文提出了一种基于接收灵敏度,通过切换D2D发射机来控制D2D用户设备功率的方案。在慢衰落环境下,假设基站和移动用户设备之间的接近增益和瞬时增益在基站处可用,并且D2D用户移动缓慢,对该方案的性能进行了评估。已经证明,与传统的CN基础设施相比,小区和速率显着增加,而不会降低小区用户的性能。
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引用次数: 4
Learning based gain-aware content dissemination in delay tolerant networks 时延容忍网络中基于学习的增益感知内容传播
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945377
Faezeh Hajiaghajani, S. Biswas
This paper presents a multicast Delay Tolerant Network (DTN) routing protocol with the goal of maximizing an economic gain for Device-to-Device (D2D) commercial content dissemination. The defined economic gain is a composite routing performance index, which combines revenue from delivery, and forwarding cost from disseminating commercial content such as coupons. Majority of existing approaches, due to lack of gain-awareness, cannot control the economic gain of dissemination, as defined in this context. In the proposed approach, which is inspired by Q-learning, nodes are able to learn a set of forwarding actions which lead to a higher expected reward, i.e., gain. Due to the online learning framework, this Q-learning based Gain-aware Routing (QGR) protocol is expected to be robust in diverse and dynamic mobility environments. Using the DTN simulation software ONE, we run experiments for functional validation and performance evaluation of the proposed protocol with respect to two existing competitive protocols under different protocol constraints and mobility scenarios.
本文提出了一种多播容忍延迟网络(DTN)路由协议,其目标是使设备到设备(D2D)商业内容传播的经济收益最大化。定义的经济收益是一个综合路由性能指数,它结合了配送收入和传播商业内容(如优惠券)的转发成本。由于缺乏对收益的认识,大多数现有办法无法控制在这方面所界定的传播的经济收益。在该方法中,受q学习的启发,节点能够学习一组转发动作,从而获得更高的期望奖励,即增益。由于在线学习框架,这种基于q学习的增益感知路由(QGR)协议有望在各种动态移动环境中保持鲁棒性。利用DTN仿真软件ONE,我们针对两种现有的竞争协议,在不同的协议约束和移动性场景下,对所提出的协议进行了功能验证和性能评估实验。
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引用次数: 5
Auto-tuning active queue management 自动调优活动队列管理
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945369
Joe H. Novak, S. Kasera
Active queue management (AQM) algorithms preemptively drop packets to prevent unnecessary delays through a network while keeping utilization high. Many AQM ideas have been proposed, but none have been widely adopted because these rely on pre-specification or pre-tuning of parameters and thresholds that do not necessarily adapt to dynamic network conditions. We develop an AQM algorithm that relies only on network runtime measurements and a natural threshold, the knee on the delay-utilization curve. We call our AQM algorithm Delay Utilization Knee (DUK) based on its key characteristic of keeping the system operating at the knee of the delay-utilization curve. We implement and evaluate DUK in the Linux kernel in a testbed, that we build, and in the ns-3 network simulator. We find that DUK can attain reduced queuing delay and reduced flow completion times compared to other algorithms with virtually no reduction in link utilization under varying network conditions.
主动队列管理(AQM)算法先发制人地丢弃数据包,以防止通过网络的不必要延迟,同时保持高利用率。已经提出了许多AQM思想,但没有一个被广泛采用,因为这些思想依赖于参数和阈值的预规范或预调优,而这些参数和阈值不一定适应动态网络条件。我们开发了一种AQM算法,该算法仅依赖于网络运行时测量和自然阈值,即延迟利用曲线的拐点。基于该算法能使系统在延迟利用曲线的拐点处运行的关键特性,我们将其称为延迟利用拐点算法(DUK)。我们在构建的Linux内核测试平台和ns-3网络模拟器中实现和评估DUK。我们发现,在不同的网络条件下,与其他算法相比,DUK可以获得更少的排队延迟和更少的流完成时间,而几乎没有减少链路利用率。
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引用次数: 3
On the importance of link characterization for wireless sensor networks in underground mines 论链路表征对井下无线传感器网络的重要性
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945456
A. Ranjan, P. Misra, H. B. Sahu
Characterization of communication links in wireless sensor networks (WSN) deployed in mine environment is of paramount importance for achieving reliable network performance. Inaccurate communication model may lead to the inferior performance of protocols designed hence may exhibit inconsistent behavior due to link degradation. It is thus significant to account for propagation factors that affect link performance of WSNs in underground mine environments. This work details observations from experimental measurements carried out in both metalliferous and coal mines to characterize the characteristics of communication links in WSNs. Based on the experimental research common denominator characteristics such as mine tunnel size, tunnel irregularities and mine infrastructure contributing to significant link degradation in WSNs in underground mines is discussed.
矿井环境下部署的无线传感器网络通信链路的特性对实现可靠的网络性能至关重要。不准确的通信模型会导致设计的协议性能下降,从而导致链路退化导致行为不一致。因此,考虑影响矿井环境下无线传感器网络链路性能的传播因素具有重要意义。这项工作详细介绍了在金属和煤矿进行的实验测量的观察结果,以表征无线传感器网络中通信链路的特性。在实验研究的基础上,讨论了矿井隧道尺寸、坑道不平整性和矿井基础设施等共同特征对地下矿井无线传感器网络链路退化的影响。
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引用次数: 4
Study and analysis of DSB-SC-FMCW radar in SDR platform SDR平台下DSB-SC-FMCW雷达的研究与分析
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945406
Vikas Arya, P. Jishnu, K. P. Ray
Radars are known for target detection but with time it found applications in other areas as well. In this paper, we demonstrate a method to send data over radar signal for communication without interfering with the original purpose of target detection. The proposed radar system is implemented using software defined radio (SDR).
雷达以目标探测而闻名,但随着时间的推移,它也在其他领域得到了应用。在本文中,我们演示了一种通过雷达信号发送数据进行通信的方法,而不会干扰目标检测的原始目的。该雷达系统采用软件定义无线电(SDR)实现。
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引用次数: 3
Performance analysis of dual-hop DF relaying systems in the combined presence of CEE and RFI CEE和RFI联合存在下双跳DF中继系统的性能分析
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945397
A. Mishra, Debmalya Mallick, Mareesh Issar, Poonam Singh
This paper presents the performance analysis of decode-and-forward (DF) relaying system in presence of both channel estimation error (CEE) and radio frequency impairments (RFI). First, the end-to-end signal-to-noise-plus-distortion-and-error ratio (SNDER) expression is derived, followed by an exact closed-form outage probability (OP) expression for Nakagami-m fading channel. As a special case, the OP analysis for Rayleigh fading channel is also provided. From the derived expressions, the relation amongst CEE and RFI is analyzed. For a complete study, the high SNR analysis of the derived equations is also carried out. The analytical results have been verified using the Monte Carlo simulations. Finally, intriguing results are presented with the help of plots shown in the numerical analysis.
本文对信道估计误差(CEE)和射频损伤(RFI)情况下的译码转发(DF)中继系统进行了性能分析。首先,推导了端到端信噪加失真误码率(SNDER)表达式,然后推导了Nakagami-m衰落信道的精确闭式中断概率(OP)表达式。作为特例,本文还对瑞利衰落信道进行了OP分析。从推导表达式出发,分析了CEE与RFI之间的关系。为了进行完整的研究,还对导出的方程进行了高信噪比分析。利用蒙特卡罗模拟对分析结果进行了验证。最后,借助数值分析中的图形给出了有趣的结果。
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引用次数: 8
Analysis of the Tau concept used in aircraft collision avoidance through kinematic simulations 通过运动学仿真分析Tau概念在飞机避碰中的应用
Pub Date : 1900-01-01 DOI: 10.1109/COMSNETS.2017.7945428
Sushrut Vaidya, Taha Khot
The airborne Traffic Alert and Collision Avoidance System (TCAS) is the current standard for detecting and avoiding potential mid-air collisions. Based on information received from nearby aircraft, TCAS issues Traffic Advisories (TAs) to alert pilots about potential conflicts. If an impending collision threat arises, TCAS provides Resolution Advisories (RAs) involving vertical maneuvers (such as Climb or Descend) to help resolve the threat. The TCAS logic primarily uses a parameter Tau, which is a measure of the time to the closest point of approach, in terms of range or vertical separation, between the two aircraft. In this paper, we use particle kinematics-based simulations to generate two-aircraft mid-air encounters with different geometries and closure rates, and we assess and compare the performance of collision threat detection criteria that employ conventional and modified definitions of Tau as well as a criterion that closely models the logic of TCAS. We analyze encounters between jet airliners, as well as those between jet airliners and small general aviation aircraft in urban airspace. Low closure rate encounters are also considered. Performance of different threat detection criteria is assessed by calculating the range and vertical separation between aircraft at the instant of RA generation. The modified Tau definitions provide greater separations than the conventional ones. The criterion that closely models the threat detection logic of TCAS provides intermediate levels of separation.
空中交通警报和碰撞避免系统(TCAS)是当前检测和避免潜在空中碰撞的标准。根据从附近飞机收到的信息,TCAS发布交通通知(TAs),提醒飞行员注意潜在的冲突。如果即将发生的碰撞威胁出现,TCAS提供解决建议(RAs),包括垂直机动(如爬升或下降),以帮助解决威胁。TCAS逻辑主要使用参数Tau,这是两架飞机之间距离或垂直距离的最近接近点的时间度量。在本文中,我们使用基于粒子运动学的仿真来生成具有不同几何形状和闭合率的两架飞机的空中相遇,并评估和比较了采用传统和修改的Tau定义以及密切模拟TCAS逻辑的标准的碰撞威胁检测标准的性能。我们分析了喷气式客机之间的相遇,以及喷气式客机与小型通用航空飞机在城市空域的相遇。低关闭率遭遇也被考虑在内。通过计算RA生成瞬间飞机之间的距离和垂直距离来评估不同威胁检测准则的性能。修改后的Tau定义提供了比传统定义更大的分离。密切模拟TCAS威胁检测逻辑的准则提供了中间级别的分离。
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引用次数: 2
期刊
2017 9th International Conference on Communication Systems and Networks (COMSNETS)
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