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Enhanced IEEE 802.11 by integrating multiuser dynamic OFDMA 通过集成多用户动态OFDMA增强IEEE 802.11
Pub Date : 2012-04-29 DOI: 10.1109/WTS.2010.5479661
H. Ferdous, M. Murshed
In this paper, we discuss the problems associated with the present contention resolution mechanism of IEEE 802.11 DCF and present a new, dynamic and robust approach to improve it. Our new MAC, using OFDMA in the physical layer, can incorporate multiple concurrent transmissions or receptions in a dynamic manner and can adjust the collision probability based on the traffic load when nodes are endowed with a single half-duplex radio only. Simulation results show that our system improves throughput by up to 40 percent, reduces collision in control messages by up to 80 percent and reduces the average delay for data transmission by up to 20 percent.
本文讨论了现有IEEE 802.11 DCF争用解决机制存在的问题,并提出了一种新的、动态的、鲁棒的改进方法。我们的MAC在物理层采用OFDMA,可以动态地合并多个并发发送或接收,并且在节点仅被赋予单个半双工无线电时,可以根据业务负载调整碰撞概率。仿真结果表明,我们的系统将吞吐量提高了40%,将控制消息中的冲突减少了80%,将数据传输的平均延迟减少了20%。
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引用次数: 20
Distributed acceleration of mobile radio network optimisation algorithms 移动无线网络优化算法的分布式加速
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479627
Yuanzhou Ye, G. Megson
The past decade has witnessed explosive growth of mobile subscribers and services. With the purpose of providing better-swifter-cheaper services, radio network optimisation plays a crucial role but faces enormous challenges. The concept of Dynamic Network Optimisation (DNO), therefore, has been introduced to optimally and continuously adjust network configurations, in response to changes in network conditions and traffic. However, the realization of DNO has been seriously hindered by the bottleneck of optimisation speed performance. An advanced distributed parallel solution is presented in this paper, as to bridge the gap by accelerating the sophisticated proprietary network optimisation algorithm, while maintaining the optimisation quality and numerical consistency. The ariesoACP product from Arieso Ltd serves as the main platform for acceleration. This solution has been prototyped, implemented and tested. Real-project based results exhibit a high scalability and substantial acceleration at an average speed-up of 2.5, 4.9 and 6.1 on a distributed 5-core, 9-core and 16-core system, respectively. This significantly outperforms other parallel solutions such as multi-threading. Furthermore, augmented optimisation outcome, alongside high correctness and self-consistency, have also been fulfilled. Overall, this is a breakthrough towards the realization of DNO.
过去十年见证了移动用户和服务的爆炸式增长。为了提供更好、更快、更便宜的服务,无线网络优化发挥着至关重要的作用,但也面临着巨大的挑战。因此,动态网络优化(DNO)的概念被引入,以优化和持续调整网络配置,以响应网络条件和流量的变化。然而,优化速度性能的瓶颈严重阻碍了DNO的实现。本文提出了一种先进的分布式并行解决方案,在保持优化质量和数值一致性的同时,通过加速复杂的专有网络优化算法来弥补这一差距。Arieso公司的ariesacp产品是加速的主要平台。该解决方案已经原型化、实现和测试。基于实际项目的结果显示出高可伸缩性和显著的加速,在分布式5核、9核和16核系统上的平均加速分别为2.5、4.9和6.1。这明显优于多线程等其他并行解决方案。此外,增强的优化结果,以及高正确性和自一致性,也已经实现。总的来说,这是实现DNO的一个突破。
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引用次数: 2
Doppler estimation for OFDM based Aeronautical Data communication 基于OFDM的航空数据通信多普勒估计
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479657
J. Haque, M. C. Ertürk, H. Arslan
The frequency spectrum is deemed to be a valuable estate. Mobile users specifically the high-speed platforms are dependent on connectivity from satellite systems. Orthogonal frequency division multiplexing (OFDM) in combination with dense encoding, offers a robust communication and spectrum compression. OFDM is sensitive to frequency shift. This results in intercarrier interference (ICI) and degrades bandwidth efficiency. High mobility platform, such as train and aircraft offer a challenging environment for increasing the spectral efficiency of the physical layer. This paper discusses the potential development of an Aeronautical Data Network (ADN) and its channel issues in particularly the high mobility and its effects of using an OFDM communication structure. OFDM ICI and frequency shift caused by the high mobility of the platform is investigated and potential methods are proposed.
频谱被认为是宝贵的财产。移动用户,特别是高速平台,依赖于卫星系统的连接。正交频分复用(OFDM)与密集编码相结合,提供了可靠的通信和频谱压缩。OFDM对频移很敏感。这将导致载波间干扰(ICI)并降低带宽效率。高移动性平台,如火车和飞机,为提高物理层的频谱效率提供了具有挑战性的环境。本文讨论了航空数据网络(ADN)的潜在发展及其信道问题,特别是高移动性及其使用OFDM通信结构的影响。研究了OFDM平台高移动性引起的ICI和频移问题,并提出了可能的解决方法。
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引用次数: 4
A study on evolving the architecture of circuit switched domain in UMTS core networks UMTS核心网电路交换域体系结构演化研究
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479632
Ye Ouyang, M. Fallah
Most mobile operators, particularly those operators with 2G GSM networks, prefer UMTS R99 or R4 as their 3G standard to evolve and upgrade their legacy 2G mobile networks. The UMTS technique, as a smooth replacement for GSM technique, provides an evolved path for the mobile operators to deploy the next generation IP based soft-switch mobile core networks. This paper first describes the basic architecture and topology of UMTS R4 core network and introduces two options in network planning: flat structure or layered structure. To propose an evolution path, the paper then suggests a “three layer structure” solution to seamlessly converge UMTS R4 core network with legacy GSM core network. The proposed solution approach achieves the all-IP vision and is capable of convergence with IMS and EPC.
大多数移动运营商,特别是那些拥有2G GSM网络的运营商,更喜欢UMTS R99或R4作为他们的3G标准,以发展和升级他们的传统2G移动网络。UMTS技术作为GSM技术的平稳替代,为移动运营商部署下一代基于IP的软交换移动核心网提供了一条演进路径。本文首先介绍了UMTS R4核心网的基本架构和拓扑结构,并介绍了网络规划的两种选择:平面结构和分层结构。为了提出演进路径,论文提出了一种“三层结构”解决方案,以无缝融合UMTS R4核心网与传统GSM核心网。该方案实现了全ip远景,并能与IMS和EPC融合。
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引用次数: 2
Measurements and characterization of link quality metrics in energy constrained IEEE 802.15.4 能量受限IEEE 802.15.4中链路质量度量的测量和表征
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479660
J. G. Servin, Á. G. Andrade
[Summary form only given]. As more and more low-cost high-quality devices appear on the market and new applications emerge every day, short-range wireless personal area networks (WPANs), both low and high-data-rate, are on the horizon. Two major efforts of IEEE are underway to enhance the development of WPANs. One is the specification of IEEE 802.15.3a, also known as ultra wideband (UWB), used in high-rate WPANs. The other is the specification of IEEE 802.15.4 for low-rate WPANs (LR-WPANs). When deploying LR-WPAN devices into a target field, information about how sensors perform at various distances and orientations relative to each other will make optimal placement easier. If each node is placed to maximize its performance in the network, the lifetime and quality of service for the entire network will increase, therefore an understanding of the wireless channel-operating environment is necessary. In this work, we evaluate through measurements, the basic characteristics of the communication channel using IEEE 802.15.4 radio devices. The experiments were conducted on the esplanade at the Engineering building. It consisted in capture the spatial radio channel properties due to stationary structures and obstacles, and the resulting findings will serve as the basis of an eventual methodology for predicting radio channel quality given an arbitrary layout. A simple transmission scheme was designed, where device-1 (receiver) acted as an access point (AP) and device-2 (transmitter) acted as a sensor placed at a location of interest. The esplanade was divided into 26×32 1m-by-1m grids, and device-2 was sequentially placed at each grid point (x,y), for one measurement. The RSSI and PER of each received packet were saved. Average RSSI and PER metrics presented for each link measurement were calculated over 3000 transmitted packets. The results clearly show the anisotropic nature of all metrics. Specifically, radio links with the same line-of-sight distance did not necessarily have similar average RSSI, or PER. As the superposition of multipath components arriving from different paths can often result in higher energy detected by the receiver (RSSI), but the resulting signal can easily be distorted from the original waveform given the phase differences of those components. About 90% of the links had a PER less than 0.005, and the worst link observed got a PER of 0.054. Links with 0.85 or higher packet reception ratios are considered good links. Links with 0.15 or less packet reception ratios are considered bad links. For one link, however, no obvious blockings but only few clutters were observed; the lower link qualities are thus attributed to multipath effects due to surrounding reflectors. Radio links between the sensors radios exhibited different path losses at different locations. The path loss was not only a function of path distance alone but also showed complex dependency on blocking and multipath effects caused by the surrounding obstacles. In genera
[仅提供摘要形式]。随着市场上越来越多的低成本、高质量的设备的出现和新应用的不断涌现,低速率和高速率的短距离无线个人区域网络(wpan)已经崭露头角。IEEE正在进行两项主要工作来促进无线局域网的发展。一个是IEEE 802.15.3a规范,也被称为超宽带(UWB),用于高速无线局域网。另一个是IEEE 802.15.4低速率无线局域网(lr - wpan)规范。当将LR-WPAN设备部署到目标场地时,有关传感器在不同距离和相对方向上的表现的信息将使最佳放置更容易。如果每个节点都被放置在网络中以最大化其性能,整个网络的服务寿命和质量将会增加,因此了解无线信道操作环境是必要的。在这项工作中,我们通过测量来评估使用IEEE 802.15.4无线电设备的通信信道的基本特性。实验是在工程大楼的广场上进行的。它包括捕捉由于固定结构和障碍物造成的空间无线电信道特性,所得结果将作为在给定任意布局的情况下预测无线电信道质量的最终方法的基础。设计了一个简单的传输方案,其中设备-1(接收器)充当接入点(AP),设备-2(发射器)充当放置在感兴趣位置的传感器。广场被划分为26×32 1m × 1m的网格,设备-2依次放置在每个网格点(x,y),进行一次测量。保存接收到的每个报文的RSSI和PER。每个链路测量的平均RSSI和PER指标是在3000个传输数据包上计算的。结果清楚地显示了所有指标的各向异性。具体来说,具有相同视距的无线电链路不一定具有相似的平均RSSI或PER。由于来自不同路径的多径分量的叠加通常会导致接收器检测到更高的能量(RSSI),但由于这些分量的相位差,产生的信号很容易从原始波形中失真。大约90%的链接的PER值小于0.005,观察到的最差链接的PER值为0.054。0.85或更高的数据包接收率被认为是良好的链路。数据包接收比小于等于0.15的链路被认为是坏链路。然而,对于一个链接,没有明显的阻塞,只有少数杂乱的观察;因此,较低的链路质量归因于周围反射器的多径效应。传感器无线电之间的无线电链路在不同位置表现出不同的路径损耗。路径损失不仅是路径距离的函数,还与周围障碍物引起的阻塞效应和多径效应有复杂的关系。总的来说,观察到链接的质量很好;多数PERs均小于0.01,与前人的研究结果一致。本文中的实验是探索在任何位置预测无线电性能的方法的初步研究。
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引用次数: 2
A method of automatic assessment of feature compatibility in mobile networks 移动网络中特征兼容性的自动评估方法
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479639
Szymon Fedor, Liam Fallon
Deployment and upgrade of a mobile network have always been challenging tasks. Very often they require human intervention because telecom networks are complex systems composed of different nodes that need to be compatible in order to communicate and provide network services. Therefore in current telecommunication systems a network expert must check all the requirements and compatibilities of the network prior to activation of a new service. Automation of the assessment of network compatibility is one of the key enablers for Autonomic Management of telecom networks. In this paper we describe a new method for automatic end-to-end assessment of compatibility between network features in a telecom network. The method enables fast, easy and accurate decision making regarding the planning of new feature deployment or the upgrade of already existing features. We built a prototype that demonstrates the described method. It shows that our method is not bound to any type of telecom network and could be used to automate deployment or upgrade of a multiple-domain network.
移动网络的部署和升级一直是一项具有挑战性的任务。它们通常需要人工干预,因为电信网络是由不同节点组成的复杂系统,为了通信和提供网络服务,这些节点需要兼容。因此,在当前的电信系统中,网络专家必须在启动一项新业务之前检查网络的所有要求和兼容性。网络兼容性评估的自动化是实现电信网络自治管理的关键因素之一。本文描述了一种电信网络中网络特征之间的端到端兼容性自动评估的新方法。该方法能够快速、简便、准确地对新特性的部署或现有特性的升级进行规划决策。我们构建了一个原型来演示所描述的方法。结果表明,该方法不受任何类型的电信网络的约束,可用于多域网络的自动部署或升级。
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引用次数: 0
Mobile communications for development: Enabling strategic and low-cost e-applications for rural and remote areas 移动通信促进发展:为农村和偏远地区提供战略性和低成本的电子应用
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479644
Souma Badombena-Wanta, E. Sheybani
The evolution and growth of digital communications technologies has spurred various instances where wireless communications are being tremendously utilized to a multitude of ends and more importantly provoking new paradigm shifts. Digital inclusion and connectivity availability on a global scale remains one critical concern and definitely fuels the motivation and initiative for innovative solutions and appropriate models to bring the digital divide to a close. Mobile Information and Communications Technologies (ICTs) are more than a suitable and powerful technology that will help provide connectivity and digital access in a much faster and cheaper way for underserved areas of the globe, and therefore are to be strategically investigated and assessed within their most vital, strategic and profitable functional or usage contexts.
数字通信技术的发展和增长刺激了无线通信被广泛应用于多种目的的各种情况,更重要的是引发了新的范式转变。全球范围内的数字包容和连接可用性仍然是一个关键问题,肯定会激发创新解决方案和适当模式的动力和主动性,以弥合数字鸿沟。移动信息和通信技术(ict)不仅仅是一种合适和强大的技术,它将有助于以更快和更便宜的方式为全球服务不足的地区提供连接和数字接入,因此需要在其最重要、最具战略性和最有利可图的功能或使用环境中进行战略性调查和评估。
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引用次数: 24
Interference management of femtocell in macro-cellular networks 大蜂窝网络中飞基站的干扰管理
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479646
Rong-Terng Juang, Pangan Ting, Hsin-Piao Lin, D. Lin
This paper investigates the impact of femtocell interference on existing macrocells with fractional frequency reuse (FFR). Instead of using complicated transmission techniques by coordinating multiple base stations (BSs), this paper adaptively configures FFR pattern to avoids interference caused by femtocells, depending on density and locations of femtocells. Simulation results show that the proposed femtocell BS deployment can effectively reduce downlink interference to macro-cellular networks.
本文研究了飞基站干扰对现有分频复用(FFR)宏基站的影响。本文根据飞基站的密度和位置,自适应配置FFR方向图以避免飞基站的干扰,而不是采用协调多个基站的复杂传输技术。仿真结果表明,所提出的飞蜂窝BS部署能够有效地减少对宏蜂窝网络的下行干扰。
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引用次数: 58
ARMA companding scheme with improved symbol error rate for PAPR reduction in OFDM systems 提高码元错误率的ARMA扩宽方案用于OFDM系统中PAPR的降低
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479631
Yasir Rahmatallah, N. Bouaynaya, S. Mohan
This paper proposes a new nonlinear companding scheme with reduced symbol error rate (SER) that can be used to reduce peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. The proposed system outperforms conventional companding systems using the same nonlinear companding functions with respect to SER without impairing PAPR reduction capability. The proposed system estimates a few autoregressive moving average (ARMA) model parameters of the difference signal between the companded and uncompanded OFDM envelopes and passes these parameters to the receiver. Upon receiving the ARMA model parameters, the receiver regenerates the difference signal and then adds it to the received companded OFDM envelope to recover the uncompanded OFDM signal. The traditional schemes employ decompanding process instead to reconstruct the uncompanded OFDM signal. Mathematical proofs and simulation results for three typical nonlinear companding functions show that, under mild sufficient conditions, the proposed scheme outperforms the conventional schemes with respect to SER performance without impairing PAPR reduction capability.
针对正交频分复用(OFDM)系统中的峰均功率比问题,提出了一种降低符号误码率(SER)的非线性压缩方案。该系统在不影响PAPR降低能力的情况下,优于使用相同非线性压缩函数的传统压缩系统。该系统对经过压缩和未经过压缩的OFDM包络差信号的一些自回归移动平均(ARMA)模型参数进行估计,并将这些参数传递给接收机。接收端接收到ARMA模型参数后,重新生成差分信号,并将差分信号加入到接收到的经过压缩的OFDM包络中,恢复未经过压缩的OFDM信号。传统的方案采用分解过程来重建未合并的OFDM信号。对三个典型非线性压缩函数的数学证明和仿真结果表明,在轻度充分条件下,该方案在不影响PAPR降低能力的情况下,在SER性能方面优于传统方案。
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引用次数: 5
Welcome to WTS 2010 欢迎来到WTS 2010
Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479680
Steven R. Powell, T. Ketseoglou, R. Sankar
Welcome to the ninth annual Wireless Telecommunications Symposium. We hope that WTS 2010: Global Wireless Communications: The Next Generation will be a stimulating and rewarding experience for you. Wireless communications is truly a global subject and an excellent one for an interdisciplinary, international wireless communications conference like WTS to explore. During the next three days WTS 2010 will explore the next generation of global wireless communications in depth - in the invited speakers' presentations; in the Next Generation Wireless Networks and the Future of Vehicular Communications panel discussions; in the Testing Wireless Infrastructure, Cellular TV Phone, Network Security Architecture, and Wireless Network Security tutorials; and in the eight tracks of the accepted paper program: Wireless Communications: Military Aspects and Satellite Applications; Wireless Algorithms, Methods, Simulations, and Software; Wireless Communications and Network Technologies; Wireless Network Security; Ad Hoc, Sensor, Mesh Networks, and RFID; Wireless Telecommunications Services, Business and Policy; Wireless Standards and Platforms; and Wireless Communications in Latin America.
欢迎参加第九届年度无线通讯研讨会。我们希望WTS 2010:全球无线通信:下一代将是一个刺激和有益的经验,为您。无线通信确实是一个全球性的课题,也是一个非常适合WTS这样的跨学科国际无线通信会议来探讨的课题。在接下来的三天里,WTS 2010将深入探讨下一代全球无线通信——在受邀演讲者的演讲中;在下一代无线网络和未来车载通信小组讨论中;在测试无线基础设施、蜂窝电视电话、网络安全架构和无线网络安全教程;在已接受的论文项目的八个轨道中:无线通信:军事方面和卫星应用;无线算法、方法、仿真和软件;无线通信和网络技术;无线网络安全;Ad Hoc,传感器,网状网络和RFID;无线电讯服务、业务及政策;无线标准和平台;以及拉丁美洲的无线通信。
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引用次数: 0
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2010 Wireless Telecommunications Symposium (WTS)
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