2011 18th International Conference on Telecommunications最新文献

MAMA: Multi-applicationmiddleware for efficient wireless sensor networks MAMA:用于高效无线传感器网络的多应用中间件

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898918

Philipp M. Glatz, L. Hörmann, C. Steger, R. Weiss

引用次数: 2

Fault diagnosis in network virtualization environment 网络虚拟化环境中的故障诊断

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898980

YaDung. Pan, Xue-song Qiu, Shun-li Zhang

{"title":"Fault diagnosis in network virtualization environment","authors":"YaDung. Pan, Xue-song Qiu, Shun-li Zhang","doi":"10.1109/CTS.2011.5898980","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898980","url":null,"abstract":"Virtual networks have emerged as a powerful and flexible platform for future network. The dependability of virtual services relies on the network's capabilities to effectively diagnose and recover faults. But the flexible characteristics of virtual networks bring to virtualization fault diagnosis new challenges, such as network scalability, inaccessible substrate network fault information, incomplete and inaccurate network observations, dynamic symptom-fault causality relationships, and multi-layer complexity. To tackle with these challenges, the paper proposes a virtual network fault diagnosis framework (called VNFD). VNFD can use observed end-to-end symptoms reported by monitoring systems to get a set of potential faulty components for evaluating their fault likelihood, and select the most likely faulty hypothesis set to explain all the observed symptoms. VNFD can locate root causes without relying on substrate network fault probabilistic quantification (e.g. prior fault probability). Simulations and experimental studies show that VNFD can efficiently and accurately get a hypothesis set explaining all the observed symptoms, even when the symptoms are incomplete and inaccurate.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121116624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Uplink interference alignment for OFDM systems OFDM系统的上行干扰对准

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898992

M. Kheirabadi, Alireza Ghiamatioun, S. Nader-Esfahani

引用次数: 2

A signal strength based medium access control for OFDMA based wireless ad hoc networks 基于信号强度的OFDMA无线自组织网络介质访问控制

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898965

H. Xiong, E. Bodanese

引用次数: 6

Optimum detection of Walsh-Hadamard multiplexed antipodal signals over Rayleigh fading channels 瑞利衰落信道上沃尔什-阿达玛多路对映信号的最佳检测

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898936

A. Iossifides

引用次数: 6

Target location based sink positioning in wireless sensor networks 无线传感器网络中基于目标位置的汇聚定位

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898923

Dimitrios Zorbas, C. Douligeris, V. Fodor

{"title":"Target location based sink positioning in wireless sensor networks","authors":"Dimitrios Zorbas, C. Douligeris, V. Fodor","doi":"10.1109/CTS.2011.5898923","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898923","url":null,"abstract":"One of the main challenges in wireless sensor networks is to prolong the network lifetime by efficiently handling the limited battery life of the nodes. This problem becomes harder in applications where the nodes are randomly dropped in the field. In this paper we deal with the problem of the sink placement and of the network longevity, assuming a number of points in the field with known positions which must be covered by the sensors. Unlike other approaches, we consider the more realistic scenario where the coordinates of the sensors are not assumed to be known in advance and, thus, they cannot be used for the computation of the positions of the sinks. We present two solutions for the above problem; one based on the distance between the points and the second on the probability that a sensor may cover many points. We evaluate our approaches and compare them to algorithms that use the knowledge of the positions of the sensors in order to compute likely sink locations. It is shown that both proposed approaches present similar or better performance concerning network lifetime, while at the same time they significantly decrease the algorithm complexity.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122879393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Sparse partial optical Code and Wavelength Conversion architecture in hybrid WDM/OCDM OBS networks WDM/OCDM混合OBS网络中的稀疏部分光编码和波长转换体系

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898921

L. Galdino, José Maranhão Neto, M. Furtado, E. Moschim, L. H. Bonani, F. Durand

引用次数: 2

Resource competition at the NGN core network: An ecologically inspired analysis NGN核心网的资源竞争:生态学启发的分析

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898988

K. Munasinghe, F. Javadi, A. Jamalipour

{"title":"Resource competition at the NGN core network: An ecologically inspired analysis","authors":"K. Munasinghe, F. Javadi, A. Jamalipour","doi":"10.1109/CTS.2011.5898988","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898988","url":null,"abstract":"Multiple traffic flows generated by multiservice applications converge at the core of the Next Generation Network (NGN). Therefore, various admission control techniques are implemented at the NGN core for ensuring that the admittance of a new flow in a resource constrained network does not unfairly disadvantage the performance of other ongoing flows. Regardless of the admission control scheme used, as the resource availability diminishes with time, a competition among the newly arriving flows with various resource consumption levels and characteristics become inevitable. As in the case of any competition, there will be negative effects, which one flow has upon another by consuming or withholding access to a resource that is limited in availability. In this paper, the phenomenon of resource competition at the core of the NGN is explored. Under this study, the NGN is considered as an ecosystem with finite resources, which comprises of heterogeneous access networks. Despite the presence of an admission control mechanism, we argue that in a competitive environment, over a period of time, certain flows corresponding to certain service classes will unfairly overwhelm the others. Analytical proof and simulation results are provided for supporting the above argument.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126569070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Spatio-temporal measurement and model for number of occupied channels 信道占用数的时空测量与模型

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898947

K. Qaraqe, Nariman Rahimian, H. Çelebi, C. Georghiades

{"title":"Spatio-temporal measurement and model for number of occupied channels","authors":"K. Qaraqe, Nariman Rahimian, H. Çelebi, C. Georghiades","doi":"10.1109/CTS.2011.5898947","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898947","url":null,"abstract":"Cognitive Radio (CR) systems are a promising solution to the spectrum scarcity problem. However, accurate modeling of spectrum utilization is essential to obtain a better quantitative understanding of important concepts of CR systems. Compact mathematical formulations that describe the realistic spectrum usage would improve the recent theoretical work to a large extent. The data generated from such models would also increase the quality of the simulation based research in the aspect of realism. Besides, in practice, measurement campaigns would prefer if they could characterize results with a few well known parameters instead of exchanging large amount of data. Therefore, in this paper we try to come up with a mathematical model for the spectrum usage by estimating the Probability Mass Function (PMF) of the number of occupied channels. Note that this also gives an insight regarding the spectrum availability. To do this, the data collected from a spectrum occupancy measurement campaign conducted in the State of Qatar is used. The measurements are performed over three consecutive days considering 700–3000 MHz frequency band at four different locations concurrently. We show that after applying the Chi square test, the Log-Normal distribution fits the best among other candidates to the empirical PMF independent of location and the threshold used to define a channel as occupied.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"696 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133970280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Emergency operations support through social networking and P2P multimedia services 通过社交网络和P2P多媒体服务支持应急行动

2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898903

C. Patrikakis, A. Voulodimos, Emmanuel Sardis, N. Papaoulakis, Dora Christofi, Georgios Dimosthenous

{"title":"Emergency operations support through social networking and P2P multimedia services","authors":"C. Patrikakis, A. Voulodimos, Emmanuel Sardis, N. Papaoulakis, Dora Christofi, Georgios Dimosthenous","doi":"10.1109/CTS.2011.5898903","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898903","url":null,"abstract":"In this paper we investigate the requirements and propose the design of a platform that will serve emergency operations such as in cases of wildfires or road accidents. This platform will provide assistance to the rescue and the disaster relief operations through the use of social networking and P2P based multimedia streaming. The general idea is to create a platform that will facilitate the provision of an efficient communication network between the stakeholders who will be involved in such life threatening situations and of the means for having a rich, multimedia based communication for first aid and guidance. Based on the use of the proposed platform the distribution of multimedia streams can be supported through innovative techniques such as media encoding and media distribution. The matching and notification of the most appropriate volunteers can be made through the use of personal profiles and the deployment of social networking tools. The access to multimedia content can be adapted to the obstacles which are introduced through the impairment of infrastructures of services capabilities.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132799633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2