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2008 International Symposium on a World of Wireless, Mobile and Multimedia Networks最新文献

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Mobile TFRC: a congestion control for WLANs 移动TFRC:无线局域网的拥塞控制
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594867
Lei Zhang, P. Sénac, E. Lochin, M. Diaz
Based on an identification and evaluation of the subtle counterproductive interactions between the WLANs MAC layer and the transport layer, this paper shows a new approach towards congestion control for WLANs. We introduce a specialization of TFRC (MTFRC: mobile TFRC), which is adapted to wireless access networks. This TFRC specialization requires only slight changes to the standard TFRC protocol. Simulation results show substantial improvements for applications over TFRC in scenarios where the bottleneck situates on the MAC layer of the mobile nodes.
基于对无线局域网MAC层和传输层之间微妙的反生产相互作用的识别和评估,提出了一种新的无线局域网拥塞控制方法。我们介绍了一种专门的TFRC (MTFRC:移动TFRC),它适用于无线接入网络。这种TFRC专门化只需要对标准TFRC协议进行轻微的更改。仿真结果表明,在瓶颈位于移动节点的MAC层的情况下,TFRC的应用程序有了实质性的改进。
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引用次数: 5
A novel physical carrier sensing scheme for enhancing spatial reuse in multihop wireless networks 一种增强多跳无线网络空间复用的物理载波感知方案
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594852
Yongning Zhang, B. Alawieh, C. Assi
Recently, tuning the physical carrier sensing threshold (CSth) has been proposed as an efficient mechanism to enhance the network throughput in an IEEE 802.11-based multihop ad hoc networks. The physical carrier sensing method reduces the likelihood of collision by preventing nodes in the vicinity of each other from transmitting simultaneously, while allowing nodes that are separated by a safe margin to engage in concurrent transmission. In this paper, we propose a distributed adaptive scheme through which nodes dynamically adjust their CSth to eliminate the likelihood of collisions from hidden terminals and in turn enhances spatial reuse by reducing the number of exposed terminals. Specifically, a node adjusts its CSth based on both its success/ failure history attempts and the information it receives from neighboring nodes through CTS packets. Moreover, to reduce the effect of exposed terminals, the proposed scheme employs the RTS/CTS exchange only for the purpose of informing neighboring nodes of their CSth but not to silence them. The proposed scheme adaptively performs a dynamic switch between the RTS/CTS access scheme and the basic scheme based on a predefined policy in order to avoid the additional overhead caused by the RTS/CTS exchange. Simulations results have demonstrated the significant throughput gains that can be achieved by the proposed scheme, compared with other methods in recent literature.
近年来,在基于IEEE 802.11的多跳自组织网络中,调优物理载波感知阈值(CSth)作为提高网络吞吐量的有效机制被提出。物理载波感知方法通过防止彼此附近的节点同时传输来降低碰撞的可能性,同时允许被安全边界分隔的节点进行并发传输。在本文中,我们提出了一种分布式自适应方案,通过节点动态调整其CSth来消除隐藏终端的碰撞可能性,从而通过减少暴露终端的数量来增强空间重用。具体来说,一个节点根据它的成功/失败历史尝试和它通过CTS数据包从邻近节点接收的信息来调整它的CSth。此外,为了减少暴露终端的影响,该方案使用RTS/CTS交换仅用于通知相邻节点其CSth而不是使其沉默。该方案基于预定义策略自适应地在RTS/CTS访问方案和基本方案之间进行动态切换,以避免RTS/CTS交换带来的额外开销。仿真结果表明,与最近文献中的其他方法相比,该方案可以实现显着的吞吐量增益。
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引用次数: 3
CREAM-MAC: An efficient Cognitive Radio-enAbled Multi-Channel MAC protocol for wireless networks CREAM-MAC:一种用于无线网络的高效认知无线电多通道MAC协议
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594853
Hang Su, Xi Zhang
Cognitive radio technology has emerged as the novel and effective approach to improve the utilization of precious radio spectrum. Employing the cognitive radio technology, secondary (unlicensed) users can opportunistically utilize the unused licensed spectrum in a way that constrains the level of interference to the primary (licensed) users. However, there are many new challenges associated with cognitive radio based wireless networks, such as the multi-channel hidden terminal problem and the fact that the time-varying channel availability is different for different secondary users, in the medium access control (MAC) layer. To overcome these challenges, we propose an efficient cognitive radio-enabled multi-channel MAC (CREAM-MAC) protocol, which integrates the spectrum sensing at physical layer and packet scheduling at MAC layer, over the wireless networks. Under the proposed CREAM-MAC protocol, each secondary user is equipped with a cognitive radio-enabled transceiver and multiple channel sensors. The proposed CREAM-MAC enables the secondary users to best utilize the unused frequency spectrum while avoiding the collisions among secondary users and between secondary users and primary users. In addition, we develop the analytical models to quantitatively analyze our proposed CREAM-MAC protocol in the saturated network case. We also conduct simulation experiments to validate our developed analytical models.
认知无线电技术是提高宝贵无线电频谱利用率的一种新颖有效的方法。利用认知无线电技术,二级(未授权)用户可以利用未使用的许可频谱,以限制对主要(授权)用户的干扰水平。然而,基于认知无线电的无线网络面临着许多新的挑战,如多信道隐藏终端问题以及不同辅助用户在介质访问控制(MAC)层的时变信道可用性不同。为了克服这些挑战,我们提出了一种高效的认知无线电多通道MAC (CREAM-MAC)协议,该协议在无线网络上集成了物理层的频谱感知和MAC层的分组调度。在拟议的CREAM-MAC协议下,每个辅助用户配备一个认知无线电收发器和多通道传感器。所提出的CREAM-MAC使辅助用户能够最好地利用未使用的频谱,同时避免了辅助用户之间以及辅助用户与主用户之间的冲突。此外,我们还开发了分析模型来定量分析我们提出的CREAM-MAC协议在饱和网络情况下的性能。我们还进行了模拟实验来验证我们开发的分析模型。
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引用次数: 100
A joint design of admission control and transmission rate adaptation for VoIP over wireless network 基于无线网络的VoIP接入控制与传输速率自适应联合设计
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594834
Youngkyu Choi, Sunghyun Choi
The ideal design for VoIP should be able to maximize the number of concurrent users while each admitted user enjoys the satisfactory quality of voice communication. In a recent packet-based wireless system, the quality-of-service (QoS) provisioning for VoIP raises several challenging issues including correlated delay performance among users and the rate-reliability tradeoff in managing multiple transmission rates on top of the inherent difficulty originating from the dependency of QoS on end-to-end delay. For these reasons, it is rarely found in the literature the work which presents the admission criteria for VoIP in an explicit manner. In this paper, our major contributions include 1) deriving the link-level QoS requirement from the E-model; 2) presenting the admission criteria in an explicit manner; 3) proposing a transmission rate adaptation algorithm specialized for VoIP application; and 4) illustrating the feasibility of our proposed schemes by getting the necessary information from the measurement. In addition to the theoretical justification, through the intensive simulation study in the Rayleigh fading environment, we prove that our joint designs composed of the rate adaptation, measurement-based admission control algorithm, and its extension to supporting the cell-boundary users indeed work well. Also, we evaluate the impact of various parameters including the average SNR, the Doppler rate, and the wireline delay.
理想的VoIP设计应该是在每个接入用户都能享受满意的语音通信质量的同时,使并发用户数最大化。在最近的基于分组的无线系统中,VoIP的服务质量(QoS)提供提出了几个具有挑战性的问题,包括用户之间的相关延迟性能和管理多个传输速率的速率可靠性权衡,以及QoS对端到端延迟的依赖所带来的固有困难。由于这些原因,在文献中很少发现以明确的方式提出VoIP录取标准的工作。在本文中,我们的主要贡献包括:1)从e模型推导链路级QoS需求;(二)明确提出录取标准;3)提出了一种专用于VoIP应用的传输速率自适应算法;4)从测量中获得必要的信息,说明了我们所提出方案的可行性。除了理论证明之外,通过在瑞利衰落环境下的深入仿真研究,我们证明了由速率自适应、基于测量的接纳控制算法及其扩展到支持小区边界用户的联合设计确实能够很好地工作。此外,我们还评估了各种参数的影响,包括平均信噪比、多普勒速率和有线延迟。
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引用次数: 1
On a synergetic architecture for cognitive adaptive behavior of future communication systems 未来通信系统认知自适应行为的协同架构研究
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594896
A. Kousaridas, N. Alonistioti
The future area of communication systems is considered as a representative example of a complex adaptive organization, where several elements, with various computational capabilities and network resources, are interconnected. This evolution renders imperative the need for adaptable and scalable systems that operate in unpredictable environments, having self-management features and the ability to handle complexity. The scope of this paper is to describe a coherent architectural framework in order to support adaptive and cognitive behavior of future communication systems, forming synergies from the most microscopic up to the most macroscopic level. Cognitive mechanisms embedded at all scales of a communication system will enable its autonomous hypostasis, facilitating also its self-organization. The synergetic architecture is modeled using autonomic element, dynamical hierarchies, and self-similarity concepts.
通信系统的未来领域被认为是一个复杂自适应组织的典型例子,其中具有各种计算能力和网络资源的几个元素是相互连接的。这种演变使得在不可预测的环境中运行、具有自我管理特性和处理复杂性的可适应和可扩展系统的需求变得迫切。本文的范围是描述一个连贯的架构框架,以支持未来通信系统的自适应和认知行为,形成从最微观到最宏观的协同作用。在通信系统的所有尺度中嵌入认知机制将使其能够实现自治本质,也促进其自组织。使用自主元素、动态层次和自相似概念对协同体系结构进行建模。
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引用次数: 5
Spatiotemporal routing algorithm in opportunistic networks 机会网络中的时空路由算法
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594894
H. A. Nguyen, S. Giordano
We propose a new routing scheme (SpatioTempo) based on modeling the mobility of device carriers in periods and cycles. SpatioTempo exploits both the spatial (context) and the temporal (periodical behavior) characteristics of people to better route and optimize the message retransmissions. The combination with Propicman[1] imparts the strong points of the latter, such as context based routing and routing with zero knowledge.
我们提出了一种新的路由方案(SpatioTempo),该方案基于周期和周期对设备载波的移动性进行建模。SpatioTempo利用人们的空间(上下文)和时间(周期性行为)特征来更好地路由和优化信息重传。与Propicman[1]的结合赋予了后者的优点,如基于上下文的路由和零知识路由。
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引用次数: 12
Hierarchical QAM BICM MIMO systems with iterative decoding and applications to media broadcast 具有迭代解码的分层QAM BICM MIMO系统及其在媒体广播中的应用
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594828
S. Ramprashad, C. Sundberg
The paper presents an approach to the design of layered BICM MIMO systems using multi-stage iterative decoding and Soft Output M-Algorithm (SOMA) based component decoders. The systems consider transmission based on multilevel coding linked to hierarchical QAM constellations. The receivers are iterative designs with a view to supporting high-rates. These receiver designs can also be used to obtain reduced complexity. The performance of the SOMA schemes are compared to achievable rate bounds for multi-level D-BLAST based schemes. The D-BLAST receivers illustrate general limitations of non-iterative approaches. The multi-layer transmission approach provides a natural support for unequal error protection (UEP), and can be used to balance tradeoffs between robust coverage vs quality in media broadcast applications. Rough predictions on such tradeoffs are given using layered MPEG2 video as a media example.
提出了一种采用多级迭代解码和基于软输出m算法(SOMA)的分量解码器设计分层BICM MIMO系统的方法。该系统考虑基于多层编码与分层QAM星座相关联的传输。接收机采用迭代设计,以支持高速率。这些接收器设计也可用于降低复杂性。将SOMA方案的性能与基于多级D-BLAST方案的可实现速率界限进行了比较。D-BLAST接收机说明了非迭代方法的一般局限性。多层传输方法为不等错误保护(UEP)提供了自然支持,并可用于在媒体广播应用中平衡健壮覆盖与质量之间的权衡。使用分层MPEG2视频作为媒体示例给出了这种权衡的粗略预测。
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引用次数: 4
Interference in wireless multihop networks: A model and its experimental evaluation 无线多跳网络中的干扰:一种模型及其实验评估
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594832
G. Parissidis, M. Karaliopoulos, M. May, T. Spyropoulos, B. Plattner
Interference is an inherent property of wireless multihop networks. Adding interference-awareness to their control functions can significantly enhance the overall network performance. In this paper we present an analytical model for the probability that a transmission destined to an arbitrary network node is successful in the presence of interference from other nodes in the network. We introduce the concept of interference areas and interference zones to express this probability as a function of the network density, node transmission probability, radio propagation environment, and network card reception sensitivity. Our derivation includes a simpleMAC model, which captures the carrier sense function of many MAC protocols. Contrary to measurementbased models, our derivation only requires information that is locally available to the nodes, avoiding all measurement-related pitfalls. The validation of our model against experiments in a real testbed, set up for this purpose in our indoor office environment, shows good match of the experimental results with the analytical predictions. Interestingly our model predictions follow closely those of more elaborate state-of-the-art analytical models. Finally, to demonstrate the real utility of our model, we have implemented on our testbed a routing metric that explicitly takes interference into account via our derivation. The throughputs of the resulting routes compare favorably with those achieved by a well-known probe-based routing metric.
干扰是无线多跳网络的固有特性。在其控制功能中加入干扰感知功能可以显著提高整体网络性能。在本文中,我们提出了在网络中存在其他节点干扰的情况下,发送到任意网络节点的传输成功概率的解析模型。我们引入干扰区域和干扰区域的概念,将这种概率表示为网络密度、节点传输概率、无线电传播环境和网卡接收灵敏度的函数。我们的推导包括一个simpleMAC模型,它捕获了许多MAC协议的载波感知功能。与基于度量的模型相反,我们的推导只需要节点在本地可用的信息,从而避免了所有与度量相关的缺陷。在我们的室内办公环境中建立了一个真实的测试平台,通过实验验证了我们的模型,结果表明实验结果与分析预测吻合良好。有趣的是,我们的模型预测与那些更精细的、最先进的分析模型密切相关。最后,为了演示我们模型的实际效用,我们在我们的测试平台上实现了一个路由度量,该度量通过我们的推导显式地考虑了干扰。结果路由的吞吐量与众所周知的基于探测的路由度量所实现的吞吐量相比是有利的。
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引用次数: 14
Mixed reliability video streaming in wireless networks 无线网络中混合可靠性视频流
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594814
J. Daka, D. Makaroff
Video has become an important application for wireless networks as they have become popular for many users and uses. There are challenges delivering video content over a wireless link, both due to the volume of traffic and the high data loss rates experienced. Data loss in compressed media results in errors in the decoded video, and noticeable visual artifacts. These losses can have long-term effects in video display. This paper presents the concept of mixed reliability video streaming (Mixed Streaming), which reduces the impact of video propagation errors in error prone wireless networks. Mixed Streaming delivers a video file using both reliable and best-effort connections. Simulation results show that Mixed Streaming reduces the impact of errors by making sure that errors on reference frames are corrected. Also, the delay cost associated with Mixed Sreaming is reasonable even for fairly high packet loss rates.
视频已经成为无线网络的一个重要应用,因为它已经受到许多用户和用途的欢迎。由于流量大和数据丢失率高,通过无线链路传输视频内容存在挑战。压缩媒体中的数据丢失会导致解码后的视频出现错误和明显的视觉伪影。这些损耗会对视频显示产生长期影响。本文提出了混合可靠性视频流(mixed streaming)的概念,以减少易出错无线网络中视频传播错误的影响。混合流传输视频文件使用可靠和最努力的连接。仿真结果表明,混合流通过确保参考帧上的错误得到纠正,减少了错误的影响。此外,即使对于相当高的丢包率,与混合流相关的延迟成本也是合理的。
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引用次数: 3
A novel Middleware for the Mobility Management Over the Internet 一种新型的互联网移动管理中间件
Pub Date : 2008-06-23 DOI: 10.1109/WOWMOM.2008.4594878
Lei Zhang, P. Sénac, E. Lochin, M. Diaz
The features of mobility, which enormously impact on how communication is evolving into the future, represent a particular challenge in todaypsilas wireless networking research. After an identification and evaluation of the gap between the discontinuities of the communication service inherent to the physical layer of mobile networks and the continuity requirements issue from the stream centric multimedia applications, we propose a novel middleware 3MOI (Middleware for the Mobility Management Over the Internet) which can support efficient and context-aware mobility management and satisfy new mobility requirements such as dynamical location management, fast handover, and continuous connection support.
移动性的特点对通信的未来发展产生了巨大的影响,是当今无线网络研究的一个特殊挑战。在识别和评估移动网络物理层固有的通信服务的不连续性与流中心多媒体应用的连续性需求问题之间的差距之后,我们提出了一种新的中间件3MOI (middleware for the Mobility Management Over the Internet),它可以支持高效和上下文感知的移动管理,并满足新的移动需求,如动态位置管理,快速切换,和连续连接支持。
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引用次数: 2
期刊
2008 International Symposium on a World of Wireless, Mobile and Multimedia Networks
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