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Cooperative Multimodal Communication最新文献

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Performance analysis and comparison of burst transmission schemes in unsaturated 802.11e WLANs 不饱和802.11e无线局域网中突发传输方案的性能分析与比较
Cooperative Multimodal Communication
Pub Date : 2012-06-01 DOI: 10.1002/WCM.1018
Jia Hu, G. Min, Michael E. Woodward
Contention free bursting (CFB) and block acknowledgement (BACK) are two innovative burst transmission schemes specified in the IEEE 802.11e standard for reducing the contention overheads and further improving the channel utilization of wireless local area networks (WLANs). Existing studies on performance analysis of the CFB and BACK schemes have been primarily focused on the system throughput and have not taken into account the realistic factors, such as unsaturated traffic loads and finite buffer capacity. To fill this gap, this paper proposes a new and comprehensive analytical model for evaluating the Quality-of-Service (QoS) metrics including throughput, end-to-end delay, and frame loss probability of both burst transmission schemes under unsaturated traffic conditions. The proposed model is validated through extensive simulation experiments and then is used to conduct performance analysis and comparison of the burst transmission schemes under various working conditions. The analytical results reveal that (1) both CFB and BACK schemes can substantially improve the QoS performance; (2) BACK scheme outperforms the CFB scheme when the transmission opportunity (TXOP) limit exceeds a threshold; (3) the analytical model can be used to identify the optimal configuration of system parameters for the burst transmission schemes subject to QoS constraints. Copyright © 2010 John Wiley & Sons, Ltd.
无争用突发(CFB)和分组确认(BACK)是IEEE 802.11e标准中为降低争用开销和进一步提高无线局域网(wlan)信道利用率而规定的两种创新的突发传输方案。现有的CFB和BACK方案的性能分析研究主要集中在系统吞吐量上，没有考虑不饱和交通负荷和有限缓冲容量等现实因素。为了填补这一空白，本文提出了一种新的综合分析模型，用于评估不饱和流量条件下两种突发传输方案的服务质量(QoS)指标，包括吞吐量、端到端延迟和帧丢失概率。通过大量的仿真实验验证了所提出的模型，并对不同工况下突发传输方案进行了性能分析和比较。分析结果表明:(1)CFB和BACK方案均能显著提高QoS性能;(2)当传输机会(TXOP)限制超过阈值时，BACK方案优于CFB方案;(3)该解析模型可用于识别受QoS约束的突发传输方案的系统参数最优配置。版权所有©2010 John Wiley & Sons, Ltd
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引用次数: 3
Heuristic RAT selection policy to minimize call blocking probability in next generation wireless networks 下一代无线网络中最小化呼叫阻塞概率的启发式RAT选择策略
Cooperative Multimodal Communication
Pub Date : 2010-02-01 DOI: 10.1002/WCM.V10:2
J. Jun, Young-June Choi, S. Bahk
In next generation wireless network (NGWN) where multiple radio access technologies (RAT) co-exist, a joint call admission control (JCAC) algorithm is needed to make a RAT selection decision for each arriving call. RAT selection policy has a significant effect on the overall new call blocking probability in the network. We propose a heuristic RAT selection policy to minimize new call blocking probability in NGWN. The proposed JCAC scheme measures the arrival rate of each class of calls in the heterogeneous wireless network. Based of the measured values of the arrival rates and using linear programming technique, the JCAC scheme determines the RAT selection policy that minimizes overall call blocking probability in the heterogeneous wireless network. Using Markov decision process, we develop an analytical model for the JCAC scheme, and derive new call blocking probability, handoff call dropping probability (HCDP), and call incompletion probability (CIP). Performance of the proposed scheme is compared with the performance of other JCAC scheme. Simulation results show that the proposed scheme reduces new call blocking probability, HCDP, and CIP in the heterogeneous wireless network. Copyright © 2009 John Wiley & Sons, Ltd. In next generation wireless network (NGWN) where multiple radio access technologies (RAT) co-exist, a joint call admission control (JCAC) algorithm is needed to make a RAT-selection decision for each arriving call. We propose a heuristic RAT selection policy to reduce call blocking probability in NGWN, and develop an analytical model to evaluate its performance. Simulation results show that the proposed scheme reduces new call blocking probability, handoff call dropping probability, and call incompletion probability in NGWN.
在多种无线接入技术共存的下一代无线网络(NGWN)中，需要一种联合呼叫接纳控制(JCAC)算法来对每个到达的呼叫进行RAT选择决策。RAT选择策略对网络中总的新呼叫阻塞概率有显著影响。我们提出了一种启发式RAT选择策略来最小化NGWN中的新呼叫阻塞概率。提出的JCAC方案测量异构无线网络中各类呼叫的到达率。JCAC方案基于到达率的测量值，利用线性规划技术，确定了异构无线网络中使总呼叫阻塞概率最小的RAT选择策略。利用马尔可夫决策过程，建立了JCAC方案的解析模型，得到了新的呼叫阻塞概率、切换呼叫丢弃概率(HCDP)和呼叫不完成概率(CIP)。将该方案的性能与其他JCAC方案的性能进行了比较。仿真结果表明，该方案降低了异构无线网络中的新呼叫阻塞概率、HCDP和CIP。版权所有©2009 John Wiley & Sons, Ltd在多种无线接入技术共存的下一代无线网络(NGWN)中，需要一种联合呼叫接纳控制(JCAC)算法来对每个到达的呼叫进行RAT选择决策。我们提出了一种启发式RAT选择策略来降低NGWN中的呼叫阻塞概率，并建立了一个分析模型来评估其性能。仿真结果表明，该方案降低了NGWN中新呼叫阻塞概率、切换呼叫丢弃概率和呼叫不完成概率。
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引用次数: 41
Multimodal Cooperative Communication 多模式协作通信
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_1
R. Beun, H. Bunt
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引用次数: 4
A Unified Framework for Constructing Multimodal Experiments and Applications 构建多模态实验的统一框架及其应用
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_14
Adam Cheyer, L. Julia, Jean-Claude Martin
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引用次数: 39
IMPROVISE: Automated Generation of Animated Graphics for Coordinated Multimedia Presentations 即兴:自动生成动画图形协调多媒体演示
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_4
Michelle X. Zhou, Steven K. Feiner
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引用次数: 8
Why Are Multimodal Systems so Difficult to Build? - About the Difference between Deictic Gestures and Direct Manipulation 为什么构建多模式系统如此困难?-关于指示手势和直接操作的区别
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_11
M. Streit
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引用次数: 6
Cooperation and Flexibility in Multimodal Communication 多模式通信中的合作与灵活性
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_7
J. Allwood
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引用次数: 51
Multimodal Reference to Objects: An Empirical Approach 对象的多模态引用:一种经验方法
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_5
R. Beun, A. Cremers
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引用次数: 13
Augmenting and Executing SharedPlans for Multimodal Communication 扩展和执行多模式通信的共享计划
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_6
O. Stock, C. Strapparava, M. Zancanaro
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引用次数: 2
Interpretation of Gestures and Speech: A Practical Approach to Multimodal Communication 手势和言语的解读:多模式交际的实用方法
Cooperative Multimodal Communication
Pub Date : 1998-01-28 DOI: 10.1007/3-540-45520-5_10
Xavier Pouteau
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引用次数: 1
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