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2008 Fourth Advanced International Conference on Telecommunications最新文献

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Design and Implementation of an Embedded Linux-Based Mobile Router for Telematics Computing 基于linux的嵌入式移动路由器的设计与实现
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.28
Jiann-Liang Chen, Shi Wei, Yao-Chung Chang, Yi-Wei Ma
{"title":"Design and Implementation of an Embedded Linux-Based Mobile Router for Telematics Computing","authors":"Jiann-Liang Chen, Shi Wei, Yao-Chung Chang, Yi-Wei Ma","doi":"10.1109/AICT.2008.28","DOIUrl":"https://doi.org/10.1109/AICT.2008.28","url":null,"abstract":"This study presents a novel embedded Linux-based mobile router with a network mobility architecture that promotes the telematics Internet services anywhere. Each mobile node in the mobile IP mechanism has to process the handoff procedure; however, the proposed mobile router can process handoff procedures for more mobile nodes simultaneously. Network performance in terms of round-trip time (RTT) and handoff latency is investigated. Improvement to packet loss with the embedded-based mobile router is 36% and average RTT is decreased by approximately 34%. Based on handoff latency analysis, it has superior performance using the mobile network with the embedded mobile router when there are more than two mobile nodes.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121754112","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
Modification of the D-TxAA Scheme for Fading Channel 衰落信道D-TxAA方案的改进
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.69
S. Semenov
{"title":"Modification of the D-TxAA Scheme for Fading Channel","authors":"S. Semenov","doi":"10.1109/AICT.2008.69","DOIUrl":"https://doi.org/10.1109/AICT.2008.69","url":null,"abstract":"The D-TxAA scheme was adopted by 3 GPP as standard for HSDPA MIMO. However, the performance of this scheme significantly decreases under the conditions of fading channel due to loss of mutual orthogonality between streams in fading. In this paper the modification of the original D-TxAA scheme is proposed which allows to improve the performance in fading channel. This improvement was achieved by means of using the additional STTD encoding on top of D-TxAA scheme, which leads to some theoretical performance decrease in static channel. The modified scheme is proposed to be used as optional mode in MIMO HSDPA.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123477940","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: 1
A Preliminary Practice for BPEL Based Multimedia Conference Web Services Orchestration 基于BPEL的多媒体会议Web服务编排的初步实践
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.81
Cheng Bo, Guo Jie, Junliang Chen, Xiangtao Lin
{"title":"A Preliminary Practice for BPEL Based Multimedia Conference Web Services Orchestration","authors":"Cheng Bo, Guo Jie, Junliang Chen, Xiangtao Lin","doi":"10.1109/AICT.2008.81","DOIUrl":"https://doi.org/10.1109/AICT.2008.81","url":null,"abstract":"Inspired by the success of Web Service technologies for the development and deployment of IT services, the telecommunications R&D community starts adapting and developing similar service delivery platforms, making use of existing basic services as building blocks to orchestrate new value-added complex services in a rapid and flexible way to catch the fast and dynamic changing market. In this paper, we have a preliminary practice for business process execution language based multimedia conference Web services orchestration, which can enable the top-down realization of service oriented architecture through coordination of multimedia conference communication Web services, and emphasis on the solution for the Parlay API specification based enhanced communication Web service accessibility, the BPEL based multimedia conference Web services process orchestration and the related key problems in multimedia conference scenarios. And finally, we also give conclusions and future research works.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128085615","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: 8
Synchronous and Asynchronous Sequential Symbol Synchronizers 同步和异步顺序符号同步器
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.79
A. Reis, J. F. Rocha, A. Gameiro, J. P. Carvalho
{"title":"Synchronous and Asynchronous Sequential Symbol Synchronizers","authors":"A. Reis, J. F. Rocha, A. Gameiro, J. P. Carvalho","doi":"10.1109/AICT.2008.79","DOIUrl":"https://doi.org/10.1109/AICT.2008.79","url":null,"abstract":"In this work, we present two synchronizer groups: the synchronous and the asynchronous. The synchronous group is based in forward logic with flip flops and the asynchronous group is based in forward logic with delay line feedback. In each group we consider two versions: the manual and the automatic. The main objective is to study the two groups, each one with two versions and to observe its jitter performance as function of the noise.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128364970","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: 0
The OSNR Study on Optical Cross Add and Drop Multiplexer (OXADM): With Limitation Highlight 光交叉加丢复用器(OXADM)的OSNR研究:局限性的重点
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.30
M. Ab-Rahman
{"title":"The OSNR Study on Optical Cross Add and Drop Multiplexer (OXADM): With Limitation Highlight","authors":"M. Ab-Rahman","doi":"10.1109/AICT.2008.30","DOIUrl":"https://doi.org/10.1109/AICT.2008.30","url":null,"abstract":"The second generation of optical switching devices described in this paper increases the capacity, flexibility, reliability and also survivability of the trunk-line optical network used for data communication. OXADM features two different bandwidth which operate in working and protection line in a ring configuration. The 'accumulation' feature has expanded their application in wavelength management and restoration system in contrast with conventional devices such as OADM and OXC. With two restoration schemes, the OXADM prototype system focuses on providing survivability through restoration against failures, such as cable/fiber cut in optical layer with ring topology by means of linear/multiplex protection and ring protection. Hybrid restoration technique with OXADM enables the linear, ring and multiplex protection mechanism to be integrated in single optical network, and it will be activated according to the degree and types of failure. The paper presents the OSNR studies on OXADM and its junction by analytically and experimentally. The maximum cascaded OXADMs based on the number of operating wavelengths and input/output ports are also calculated. The result then will be compared with conventional devices; OXC and OADM.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131205728","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: 3
Research on Pulse Radiation of Planar Equiangular Spiral Antennas 平面等角螺旋天线脉冲辐射研究
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.9
Shi-zhong Yang, Chang-yong Li, H. Cao, Cheng-chang Zhang, Wei Chi
{"title":"Research on Pulse Radiation of Planar Equiangular Spiral Antennas","authors":"Shi-zhong Yang, Chang-yong Li, H. Cao, Cheng-chang Zhang, Wei Chi","doi":"10.1109/AICT.2008.9","DOIUrl":"https://doi.org/10.1109/AICT.2008.9","url":null,"abstract":"Planar Equiangular Spiral Antennas (PESA) are modeled by the RGWedge element models in this study. The surface current of the antenna is solved by the Method of Moment (MoM), and input impedance, transfer function and radiated pulse waveform of it are presented. The research indicated that, in the interesting frequency band, its input impedance is in good agreement with the theoretical value of that of Self-Compensated antennas (as defined by Babinet' principle). Its transfer function has a flat amplitude response and a linear phase response over very wide band. PESA can be used as a ultra-wide band (UWB) pulse antenna. Radiating electric field waveform is similar to that of second derivative Gaussian pulse.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130357930","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: 5
S-RARE; a Simplified Receiver Assisted Routing Protocol for Ad-Hoc Networks S-RARE;一种简化的Ad-Hoc网络接收机辅助路由协议
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.67
Y. Abdelmalek, Osama Hussien, T. Saadawi
{"title":"S-RARE; a Simplified Receiver Assisted Routing Protocol for Ad-Hoc Networks","authors":"Y. Abdelmalek, Osama Hussien, T. Saadawi","doi":"10.1109/AICT.2008.67","DOIUrl":"https://doi.org/10.1109/AICT.2008.67","url":null,"abstract":"A simplified receiver assisted routing enhancement (S-RARE) protocol is proposed. The S-RARE technique is a generic add-on middleware to MANET routing algorithms. A simplified mathematical model is presented using the probabilistic technique. In this paper, we used the principle of the biologically inspired ant routing technique as example to implement the S- RARE algorithm. The similarities and differences between S-RARE and the traditional ant technique have been highlighted. The S-RARE quickly finds a path between the source and destination with low overhead. S-RARE technique performs better in highly dynamic network topology. The performance of the proposed S-RARE is simulated and compared to the traditional ant in radio network model (random graph model). The simulation results show the significant improvement when S-RARE technique is set up as add-on module on top of traditional ant work.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"05 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130971851","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: 0
High Speed Synchronizers Operating Internally at Submultiples Rate 高速同步器在内部以子倍数速率运行
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.80
A. Reis, J. F. Rocha, A. Gameiro, J. P. Carvalho
{"title":"High Speed Synchronizers Operating Internally at Submultiples Rate","authors":"A. Reis, J. F. Rocha, A. Gameiro, J. P. Carvalho","doi":"10.1109/AICT.2008.80","DOIUrl":"https://doi.org/10.1109/AICT.2008.80","url":null,"abstract":"In this work, we present the synchronizer as a significant part of a synchronous communication system. At high-speed communication, the synchronous system is advantageous over the asynchronous one, due to its greater transmission efficiency. We begin presenting four synchronizers which are the analog, the hybrid, the combinational and the sequential. All this synchronizers operate at a VCO frequency equal to the transmission rate. After, we present two more sequential versions, operating one at half rate and the other at a quarter rate. Our main objective is to test all this synchronizers in terms of output jitter as function of the input noise.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134427867","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: 0
Anomaly Detection Using DSNS and a Dependency Graph for SNMP Objects 使用DSNS和SNMP对象依赖图进行异常检测
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.22
B. Zarpelão, L. Mendes, M. L. Proença
{"title":"Anomaly Detection Using DSNS and a Dependency Graph for SNMP Objects","authors":"B. Zarpelão, L. Mendes, M. L. Proença","doi":"10.1109/AICT.2008.22","DOIUrl":"https://doi.org/10.1109/AICT.2008.22","url":null,"abstract":"This paper addresses the problem of detecting anomalies in computer networks. Anomalies are significant changes in traffic levels, which can cause grave consequences to the execution of services offered by the network. The main characteristics of the anomaly detection system proposed in this work are: (i) application of the DSNS (digital signature of network segment), in order to detect the traffic behavior deviations, (ii) application of a dependency graph that represents the relations between the SNMP objects, in order to correlate the alarms generated for different objects. The results obtained from initial tests performed in a real environment were encouraging. They showed that our system is able to detect anomalies on the monitored network elements, avoiding the high false alarms rate.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114537815","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: 0
Performance Study of OBS Reservation Protocols OBS预约协议的性能研究
2008 Fourth Advanced International Conference on Telecommunications Pub Date : 2008-06-08 DOI: 10.1109/AICT.2008.70
M. Aydin, T. Atmaca, A. Zaim, O. C. Turna, V. Nguyen
{"title":"Performance Study of OBS Reservation Protocols","authors":"M. Aydin, T. Atmaca, A. Zaim, O. C. Turna, V. Nguyen","doi":"10.1109/AICT.2008.70","DOIUrl":"https://doi.org/10.1109/AICT.2008.70","url":null,"abstract":"This paper presents a comparison of reservation protocols used in optical burst switches (OBS) with quality of service (QoS). In terms of performance criteria, byte loss rate, end-to-end delay and access delay are considered. A 2-state MMPP(Markov modulated Poisson process) traffic generator on a 14-node mesh network topology illustrating NSFNET is chosen as the testbed. This topology is simulated using NS2 network simulation platform. Bursts are created using a hybrid model that takes into account both timeout and maximum length methods. In edge and core nodes, there are different QoS mechanisms such as explicit tear down and priority based queuing. Simulation results have shown that JIT (just in time) algorithm is not as successful as JET (just enough time) and horizon when the network is highly loaded. However, JET algorithm produces better performance than other reservation protocols while considering QoS.","PeriodicalId":105735,"journal":{"name":"2008 Fourth Advanced International Conference on Telecommunications","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116237235","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: 11
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