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Proceedings of the 19th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems最新文献

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Performance of D2D Underlay and Overlay for Elastic Traffic 弹性交通中D2D底层和覆盖的性能
Prajwal Osti, P. Lassila, S. Aalto
We explore the performance of different resource allocation schemes for transferring elastic traffic in a cellular network that is either overlaid or underlaid with D2D traffic. To this end, we model a single cell during uplink transmissions and jointly consider the presence of a randomly varying number of D2D and cellular users in the system. We use different processor sharing queueing models to characterize the performance of the overlaying and underlaying schemes and measure the performance as the mean flow level delay. In the overlaying approach, depending on the load a certain fraction of the radio resources is reserved for the D2D traffic and the cellular traffic, and hence there is no interference between the D2D and cellular users. In the underlaying approach, the D2D users are allowed to opportunistically transmit unless being interfered by a cellular user nearby. Our numerical studies reveal that the underlaying D2D traffic scheme provides a good performance compared to other methods, especially if the interference range of a cellular user is small compared with the cell dimensions. Moreover, the so-called dynamic overlay method we propose appears to perform better than the static overlay scheme.
我们探讨了在蜂窝网络中传输弹性流量的不同资源分配方案的性能,该网络要么覆盖D2D流量,要么覆盖D2D流量。为此,我们在上行传输过程中对单个小区进行建模,并共同考虑系统中随机变化数量的D2D和小区用户的存在。我们使用不同的处理器共享队列模型来表征覆盖和底层方案的性能,并以平均流级延迟来衡量性能。在覆盖方法中,根据负载为D2D业务和蜂窝业务保留一定比例的无线电资源,因此D2D和蜂窝用户之间不存在干扰。在底层方法中,D2D用户被允许机会地传输,除非被附近的蜂窝用户干扰。我们的数值研究表明,与其他方法相比,底层D2D流量方案提供了良好的性能,特别是当蜂窝用户的干扰范围与蜂窝尺寸相比较小时。此外,我们提出的所谓动态叠加方法似乎比静态叠加方案性能更好。
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引用次数: 3
T-SIMn: Towards the High Fidelity Trace-Based Simulation of 802.11n Networks T-SIMn:面向802.11n网络的高保真跟踪仿真
A. Abedi, Andrew Heard, Tim Brecht
In this paper, we describe the design, implementation and evaluation of a new framework for the trace-based evaluation of 802.11n networks, which we call T-SIMn. We first develop novel techniques for collecting and processing traces for 802.11n networks that incorporate Frame Aggregation (FA). We then demonstrate that the simulator portion of our framework (SIMn) accurately simulates throughput for one, two and three-antenna Physical Layer Data Rates in 802.11n with FA. Finally, we evaluate the T-SIMn framework (including trace collection) by collecting traces using an iPhone which is representative of a wide variety of one antenna devices. We show that our framework can be used to accurately simulate these scenarios and we demonstrate the fidelity of SIMn by uncovering problems with our initial evaluation methodology. We expect that the T-SIMn framework will be suitable for easily and fairly comparing algorithms that must be optimized for different and varying 802.11n channel conditions which are challenging to evaluate experimentally. These include rate adaptation, frame aggregation and channel bandwidth adaptation algorithms. git
在本文中,我们描述了一种新的基于跟踪的802.11n网络评估框架的设计、实现和评估,我们称之为T-SIMn。我们首先开发用于收集和处理包含帧聚合(FA)的802.11n网络的迹线的新技术。然后,我们证明了我们的框架(SIMn)的模拟器部分准确地模拟了具有FA的802.11n中一个、两个和三个天线物理层数据速率的吞吐量。最后,我们通过使用代表各种单天线设备的iPhone收集跟踪来评估T-SIMn框架(包括跟踪收集)。我们展示了我们的框架可以用来准确地模拟这些场景,我们通过揭示我们的初始评估方法的问题来展示SIMn的保真度。我们期望T-SIMn框架将适用于简单和公平地比较算法,这些算法必须针对不同和变化的802.11n信道条件进行优化,这些条件在实验评估中具有挑战性。其中包括速率自适应、帧聚合和信道带宽自适应算法。git
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引用次数: 3
Passive Classification of Wi-Fi Enabled Devices 使能Wi-Fi设备的被动分类
A. Redondi, D. Sanvito, M. Cesana
We propose a method for classifying Wi-Fi enabled mobile handheld devices (smartphones) and non-handheld devices (laptops) in a completely passive way, that is resorting neither to traffic probes on network edge devices nor to deep packet inspection techniques to read application layer information. Instead, classification is performed starting from probe requests Wi-Fi frames, which can be sniffed with inexpensive commercial hardware. We extract distinctive features from probe request frames (how many probe requests are transmitted by each device, how frequently, etc.) and take a machine learning approach, training four different classifiers to recognize the two types of devices. We compare the performance of the different classifiers and identify a solution based on a Random Decision Forest that correctly classify devices 95% of the times. The classification method is then used as a pre-processing stage to analyze network traffic traces from the wireless network of a university building, with interesting considerations on the way different types of devices uses the network (amount of data exchanged, duration of connections, etc.). The proposed methodology finds application in many scenarios related to Wi-Fi network management/optimization and Wi-Fi based services.
我们提出了一种以完全被动的方式对支持Wi-Fi的移动手持设备(智能手机)和非手持设备(笔记本电脑)进行分类的方法,即既不借助于网络边缘设备上的流量探测,也不借助于深度数据包检测技术来读取应用层信息。相反,分类是从探测请求Wi-Fi帧开始执行的,这可以用廉价的商业硬件进行嗅探。我们从探测请求帧中提取不同的特征(每个设备传输多少个探测请求,频率等),并采用机器学习方法,训练四种不同的分类器来识别两种类型的设备。我们比较了不同分类器的性能,并基于随机决策森林确定了一个解决方案,该解决方案在95%的时间内正确地对设备进行分类。然后将分类方法用作预处理阶段,分析来自大学大楼无线网络的网络流量轨迹,并对不同类型的设备使用网络的方式(交换的数据量、连接的持续时间等)进行有趣的考虑。所提出的方法在与Wi-Fi网络管理/优化和基于Wi-Fi的服务相关的许多场景中都有应用。
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引用次数: 10
Do LoRa Low-Power Wide-Area Networks Scale? LoRa低功耗广域网能规模化吗?
Martin C. Bor, U. Roedig, T. Voigt, Juan M. Alonso
New Internet of Things (IoT) technologies such as Long Range (LoRa) are emerging which enable power efficient wireless communication over very long distances. Devices typically communicate directly to a sink node which removes the need of constructing and maintaining a complex multi-hop network. Given the fact that a wide area is covered and that all devices communicate directly to a few sink nodes a large number of nodes have to share the communication medium. LoRa provides for this reason a range of communication options (centre frequency, spreading factor, bandwidth, coding rates) from which a transmitter can choose. Many combination settings are orthogonal and provide simultaneous collision free communications. Nevertheless, there is a limit regarding the number of transmitters a LoRa system can support. In this paper we investigate the capacity limits of LoRa networks. Using experiments we develop models describing LoRa communication behaviour. We use these models to parameterise a LoRa simulation to study scalability. Our experiments show that a typical smart city deployment can support 120 nodes per 3.8 ha, which is not sufficient for future IoT deployments. LoRa networks can scale quite well, however, if they use dynamic communication parameter selection and/or multiple sinks.
新的物联网(IoT)技术,如远程(LoRa)正在出现,可以实现长距离的节能无线通信。设备通常直接与汇聚节点通信,这样就不需要构建和维护复杂的多跳网络。由于覆盖范围很广,而且所有设备都直接与几个汇聚节点通信,因此大量节点必须共享通信媒介。因此,LoRa提供了一系列通信选项(中心频率、扩频系数、带宽、编码速率),发射机可以从中选择。许多组合设置是正交的,并提供同时无碰撞的通信。然而,LoRa系统所能支持的发射机数量是有限的。本文主要研究LoRa网络的容量限制问题。通过实验,我们开发了描述LoRa通信行为的模型。我们使用这些模型来参数化LoRa仿真以研究可扩展性。我们的实验表明,典型的智慧城市部署可以支持每3.8 ha 120个节点,这对于未来的物联网部署是不够的。但是,如果使用动态通信参数选择和/或多个接收器,LoRa网络可以很好地扩展。
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引用次数: 612
Revisiting 802.11 Rate Adaptation from Energy Consumption's Perspective 从能耗角度重新审视802.11速率适配
Iñaki Ucar, Carlos Donato, P. Serrano, Andres Garcia-Saavedra, A. Azcorra, A. Banchs
Rate adaptation in 802.11 WLANs has received a lot of attention from the research community, with most of the proposals aiming at maximising throughput based on network conditions. Considering energy consumption, an implicit assumption is that optimality in throughput implies optimality in energy efficiency, but this assumption has been recently put into question. In this paper, we address via analysis and experimentation the relation between throughput performance and energy efficiency in multi-rate 802.11 scenarios. We demonstrate the trade-off between these performance figures, confirming that they may not be simultaneously optimised, and analyse their sensitivity towards the energy consumption parameters of the device. Our results provide the means to design novel rate adaptation schemes that takes energy consumption into account.
802.11 wlan的速率自适应已经受到了研究界的广泛关注,大多数建议的目标是基于网络条件最大化吞吐量。考虑到能源消耗,一个隐含的假设是吞吐量的最优性意味着能源效率的最优性,但这一假设最近受到了质疑。在本文中,我们通过分析和实验来解决多速率802.11场景中吞吐量性能和能源效率之间的关系。我们展示了这些性能数据之间的权衡,确认它们可能无法同时优化,并分析了它们对设备能耗参数的敏感性。我们的研究结果为设计考虑能源消耗的新型速率适应方案提供了手段。
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引用次数: 8
Making On-Demand Routing Efficient with Route-Request Aggregation 通过路由请求聚合使按需路由更高效
Maziar Mirzazad Barijough, J. Garcia-Luna-Aceves
In theory, on-demand routing is very attractive for mobile ad hoc networks (MANET), because it induces signaling only for those destinations for which there is data traffic. However, in practice, the signaling overhead of existing on-demand routing protocols becomes excessive as the rate of topology changes increases due to mobility or other causes. We introduce the first on-demand routing approach that eliminates the main limitation of on-demand routing by aggregating route requests (RREQ) for the same destinations. The approach can be applied to any existing on-demand routing protocol, and we introduce the Ad-hoc Demand-Aggregated Routing with Adaptation (ADARA) as an example of how RREQ aggregation can be used. ADARA is compared to AODV and OLSR using discrete-event simulations, and the results show that aggregating RREQs can make on-demand routing more efficient than existing proactive or on-demand routing protocols.
理论上,按需路由对移动自组织网络(MANET)非常有吸引力,因为它只对那些有数据流量的目的地诱导信令。然而,在实践中,由于移动性或其他原因导致拓扑变化的速度增加,现有按需路由协议的信令开销会变得过高。我们介绍了第一种按需路由方法,该方法通过聚合相同目的地的路由请求(RREQ)来消除按需路由的主要限制。该方法可以应用于任何现有的按需路由协议,我们介绍了带有自适应的Ad-hoc需求聚合路由(ADARA)作为如何使用RREQ聚合的示例。利用离散事件仿真将ADARA与AODV和OLSR进行了比较,结果表明,聚合rreq可以使按需路由比现有的主动或按需路由协议更有效。
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引用次数: 0
Learning-Based Resource Allocation Scheme for TDD-Based 5G CRAN System 基于tdd的5G CRAN系统基于学习的资源分配方案
Sahar Imtiaz, H. Ghauch, Muhammad Mahboob Ur Rahman, G. Koudouridis, J. Gross
Provision of high data rates with always-on connectivity to high mobility users is one of the motivations for design of fifth generation (5G) systems. High system capacity can be achieved by coordination between large number of antennas, which is done using the cloud radio access network (CRAN) design in 5G systems. In terms of baseband processing, allocation of appropriate resources to the users is necessary to achieve high system capacity, for which the state of the art uses the users' channel state information (CSI); however, they do not take into account the associated overhead, which poses a major bottleneck for the effective system performance. In contrast to this approach, this paper proposes the use of machine learning for allocating resources to high mobility users using only their position estimates. Specifically, the `random forest' algorithm, a supervised machine learning technique, is used to design a learning-based resource allocation scheme by exploiting the relationships between the system parameters and the users' position estimates. In this way, the overhead for CSI acquisition is avoided by using the position estimates instead, with better spectrum utilization. While the initial numerical investigations, with minimum number of users in the system, show that the proposed learning-based scheme achieves 86% of the efficiency achieved by the perfect CSI-based scheme, if the effect of overhead is factored in, the proposed scheme performs better than the CSI-based approach. In a realistic scenario, with multiple users in the system, the significant increase in overhead for the CSI-based scheme leads to a performance gain of 100%, or more, by using the proposed scheme, and thus proving the proposed scheme to be more efficient in terms of system performance.
为高移动性用户提供具有始终在线连接的高数据速率是设计第五代(5G)系统的动机之一。高系统容量可以通过大量天线之间的协调来实现,这是在5G系统中使用云无线接入网络(CRAN)设计完成的。在基带处理方面,为实现高系统容量,需要向用户分配适当的资源,为此,目前的技术使用用户的信道状态信息(CSI);然而,它们没有考虑到相关的开销,这对有效的系统性能构成了主要的瓶颈。与此方法相反,本文提出使用机器学习仅使用其位置估计为高移动性用户分配资源。具体来说,“随机森林”算法是一种监督机器学习技术,通过利用系统参数和用户位置估计之间的关系来设计基于学习的资源分配方案。通过这种方式,通过使用位置估计来避免CSI采集的开销,具有更好的频谱利用率。最初的数值研究表明,在系统中用户数量最少的情况下,基于学习的方案的效率是基于csi的方案的86%,如果考虑开销的影响,该方案的性能优于基于csi的方案。在一个实际的场景中,系统中有多个用户,通过使用所建议的方案,基于csi的方案开销的显著增加导致性能提高100%,甚至更多,从而证明所建议的方案在系统性能方面更有效。
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引用次数: 15
Holistic Small Cell Traffic Balancing across Licensed and Unlicensed Bands 跨许可和非许可频段的整体小基站流量平衡
Ursula Challita, M. Marina
Due to the dramatic growth in mobile data traffic on one hand and the scarcity of the licensed spectrum on the other hand, mobile operators are considering the use of unlicensed bands (especially those in 5 GHz) as complementary spectrum for providing higher system capacity and better user experience. This approach is currently being standardized by 3GPP under the name of LTE Licensed-Assisted Access (LTE-LAA). In this paper, we take a holistic approach for LTE-LAA small cell traffic balancing by jointly optimizing the use of the licensed and unlicensed bands. We pose this traffic balancing as an optimization problem that seeks proportional fair coexistence of WiFi, small cell and macro cell users by adapting the transmission probability of the LTE-LAA small cell in the licensed and unlicensed bands. The motivation for this formulation is for the LTE-LAA small cell to switch between or aggregate licensed and unlicensed bands depending on the interference/traffic level and the number of active users in each band. We derive a closed form solution for this optimization problem and additionally propose a transmission mechanism for the operation of the LTE-LAA small cell on both bands. Through numerical and simulation results, we show that our proposed traffic balancing scheme, besides enabling better LTE-WiFi coexistence and efficient utilization of the radio resources relative to the existing traffic balancing scheme, also provides a better tradeoff between maximizing the total network throughput and achieving fairness among all network flows compared to alternative approaches.
由于流动数据流量的急剧增长,而另一方面又由于牌照频谱的稀缺,流动营办商正考虑使用免牌照频段(特别是5ghz频段)作为补充频谱,以提供更高的系统容量和更好的用户体验。这种方法目前正在由3GPP以LTE许可辅助接入(LTE- laa)的名义进行标准化。在本文中,我们通过联合优化许可和非许可频段的使用,采用整体方法实现LTE-LAA小小区流量平衡。我们将这种流量平衡作为一个优化问题,通过调整LTE-LAA小蜂窝在许可和未许可频段的传输概率,寻求WiFi、小蜂窝和宏蜂窝用户的比例公平共存。这种方案的动机是让LTE-LAA小型小区根据每个频段的干扰/流量水平和活跃用户数量在许可和未许可频段之间切换或聚合。我们推导了该优化问题的封闭解,并提出了在两个频段上运行LTE-LAA小蜂窝的传输机制。通过数值和仿真结果,我们表明,与现有的流量均衡方案相比,我们提出的流量均衡方案除了能够更好地实现LTE-WiFi共存和有效利用无线电资源外,还提供了更好的权衡,以最大限度地提高网络总吞吐量和实现所有网络流之间的公平性。
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引用次数: 9
Proceedings of the 19th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems 第19届ACM无线和移动系统建模、分析和仿真国际会议论文集
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引用次数: 0
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Proceedings of the 19th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems
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