Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274226
B. Natarajan
This paper studies experimentally the efficiency of ATM technology in transporting IP packets. Efficiency of ATM in transporting IP packets has been a subject of considerable interest and a much-researched topic-studies in the past include [R. Caceres, July 28 1991], [M. Hassan et al., 2000]. This paper attempts to specifically study the efficiency, with LLC/SNAP (logical link control/sub network attachment point) encapsulation technique being employed for transporting small sized IP packets over the ATM AAL5 (ATM adaptation layer 5). Since ATM chops a variable length PDU into fixed length cells and pads additional bytes to create the 48-byte cells, the transmission efficiency offered by ATM for small length PDU of 0-48 bytes ranges as low from 15% to 40%. This paper summarizes the efficiency for small length IP datagrams of size 8 bytes to 1500 bytes, which was verified using a test setup. Transmission efficiency can be defined as the ratio of number of useful bytes to the total number of bytes actually transmitted on the link.
{"title":"Study of transmission efficiency of IP packets over ATM using LLC/SNAP encapsulation","authors":"B. Natarajan","doi":"10.1109/APCC.2003.1274226","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274226","url":null,"abstract":"This paper studies experimentally the efficiency of ATM technology in transporting IP packets. Efficiency of ATM in transporting IP packets has been a subject of considerable interest and a much-researched topic-studies in the past include [R. Caceres, July 28 1991], [M. Hassan et al., 2000]. This paper attempts to specifically study the efficiency, with LLC/SNAP (logical link control/sub network attachment point) encapsulation technique being employed for transporting small sized IP packets over the ATM AAL5 (ATM adaptation layer 5). Since ATM chops a variable length PDU into fixed length cells and pads additional bytes to create the 48-byte cells, the transmission efficiency offered by ATM for small length PDU of 0-48 bytes ranges as low from 15% to 40%. This paper summarizes the efficiency for small length IP datagrams of size 8 bytes to 1500 bytes, which was verified using a test setup. Transmission efficiency can be defined as the ratio of number of useful bytes to the total number of bytes actually transmitted on the link.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"IM-34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126635742","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274470
T. Utahara
In this report, we present a delivery method of the chain-casting type optimized for users of media-streaming in the P2P environment. A tree structure is used with chain-casting between users, and the users are given an incentive to form many branches. The high-volume users thus form chain-casting trees which are better dispersed over the network than is the case with other content-delivery systems (CDNs) that carries commercial content has to include digital rights management (DRM), authentication, and billing facilities. Chain-casting is unsuitable for these tasks. In this method, a broker provides control of DRM, authentication, and billing. In typical chain-casting, the further an end-branch is from the root, the longer it takes to start viewing the required content. The method includes a function that breaks the content up into short blocks so that end-branch users are able to start viewing the content earlier than they would otherwise be able to-each block also includes redundant packets as a countermeasure for packet loss.
{"title":"Short-delay playback and high reliability content delivery through chain-casting","authors":"T. Utahara","doi":"10.1109/APCC.2003.1274470","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274470","url":null,"abstract":"In this report, we present a delivery method of the chain-casting type optimized for users of media-streaming in the P2P environment. A tree structure is used with chain-casting between users, and the users are given an incentive to form many branches. The high-volume users thus form chain-casting trees which are better dispersed over the network than is the case with other content-delivery systems (CDNs) that carries commercial content has to include digital rights management (DRM), authentication, and billing facilities. Chain-casting is unsuitable for these tasks. In this method, a broker provides control of DRM, authentication, and billing. In typical chain-casting, the further an end-branch is from the root, the longer it takes to start viewing the required content. The method includes a function that breaks the content up into short blocks so that end-branch users are able to start viewing the content earlier than they would otherwise be able to-each block also includes redundant packets as a countermeasure for packet loss.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121316398","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274287
Ting-Yuan Wang, Kun-Tso Chen, Hsien-Po Shiang, Min Yang, H. Tsao, Jingshown Wu
In this paper, we propose a novel high-speed asynchronous scalable variable-length self-routing packet switch, called NTU-II switch. The architecture is based on a multi-plane crossbar structure with a self-routing switch element. Contrary to conventional crossbar switches, the proposed switch does not need any central controller, complex scheduling schemes, speedup mechanism, or arbiter. The routing mechanism works in each self-routing switch element independently and uses polling handshaking protocol to transfer packets between internal circuits. Therefore, the modular design, high scalability, and asynchronous transfer become possible and easier. The throughput of the proposed switch is analyzed and simulated. Owing to the sub-switch plane mechanism, the throughput of a four plane switch without input port expansion can easily reach 100% simulated in both uniform distribution input traffic and hot spot input traffic model. The architecture has been verified in 100 Mbps Ethernet system with FPGA, and completely simulated in 1 Gb/s (IEEE 802.3z) Ethernet system with FPGA (VirtexII vc2v3000fg676-4, Xilinx Corp.). Because of its simplicity and scalable design, the proposed switch also may be implemented by VLSI technology to meet the 10 Gb/s (IEEE802.3ae) Ethernet switch requirements.
{"title":"A novel high speed asynchronous scalable variable-length self-routing packet switch","authors":"Ting-Yuan Wang, Kun-Tso Chen, Hsien-Po Shiang, Min Yang, H. Tsao, Jingshown Wu","doi":"10.1109/APCC.2003.1274287","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274287","url":null,"abstract":"In this paper, we propose a novel high-speed asynchronous scalable variable-length self-routing packet switch, called NTU-II switch. The architecture is based on a multi-plane crossbar structure with a self-routing switch element. Contrary to conventional crossbar switches, the proposed switch does not need any central controller, complex scheduling schemes, speedup mechanism, or arbiter. The routing mechanism works in each self-routing switch element independently and uses polling handshaking protocol to transfer packets between internal circuits. Therefore, the modular design, high scalability, and asynchronous transfer become possible and easier. The throughput of the proposed switch is analyzed and simulated. Owing to the sub-switch plane mechanism, the throughput of a four plane switch without input port expansion can easily reach 100% simulated in both uniform distribution input traffic and hot spot input traffic model. The architecture has been verified in 100 Mbps Ethernet system with FPGA, and completely simulated in 1 Gb/s (IEEE 802.3z) Ethernet system with FPGA (VirtexII vc2v3000fg676-4, Xilinx Corp.). Because of its simplicity and scalable design, the proposed switch also may be implemented by VLSI technology to meet the 10 Gb/s (IEEE802.3ae) Ethernet switch requirements.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126087795","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274420
Liang Cheng
Wireless awareness for wireless intelligent network is the capability of network services to be aware of the existence and characteristics of the wireless links in the communication path. This position paper summarizes several intrusive and nonintrusive wireless awareness techniques and proposes a new framework design for integrating wireless awareness into the wireless network to improve network intelligence for next-generation wireless communication networks.
{"title":"Wireless awareness for wireless intelligent network","authors":"Liang Cheng","doi":"10.1109/APCC.2003.1274420","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274420","url":null,"abstract":"Wireless awareness for wireless intelligent network is the capability of network services to be aware of the existence and characteristics of the wireless links in the communication path. This position paper summarizes several intrusive and nonintrusive wireless awareness techniques and proposes a new framework design for integrating wireless awareness into the wireless network to improve network intelligence for next-generation wireless communication networks.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121250004","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274482
S. M. Tahir, A.Z. Sha 'ameri
Feature extraction from speech representation is one of the processes in speech recognition. Parametric modeling is a dominant approach to model speech signals. Within a localized interval, speech representation is equivalent to a noise driven output from an all-pole system that can be estimated using linear prediction. Besides the characteristics of speech, temporal variability of speech signal model is also due to the computation of linear prediction coefficients. Thus, an alternative representation is proposed based on the Gabor coefficients. In this paper, a comparison is made with the linear prediction coefficients to show the consistency of the parameters that are generated for implementation in the speech recognition system.
{"title":"A comparison between speech signal representation using linear prediction and Gabor transform","authors":"S. M. Tahir, A.Z. Sha 'ameri","doi":"10.1109/APCC.2003.1274482","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274482","url":null,"abstract":"Feature extraction from speech representation is one of the processes in speech recognition. Parametric modeling is a dominant approach to model speech signals. Within a localized interval, speech representation is equivalent to a noise driven output from an all-pole system that can be estimated using linear prediction. Besides the characteristics of speech, temporal variability of speech signal model is also due to the computation of linear prediction coefficients. Thus, an alternative representation is proposed based on the Gabor coefficients. In this paper, a comparison is made with the linear prediction coefficients to show the consistency of the parameters that are generated for implementation in the speech recognition system.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"464 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115317397","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274463
S. Lamultree, C. Phongcharoenpanich, S. Kosulvit, M. Krairiksh
This paper proposes a dihedral corner reflector excited by a probe inside rectangular ring. The antenna structure is simple. The radiation characteristics of the antenna for various spacing between a probe inside rectangular ring and the dihedral corner reflector are analyzed. The numerical results of the radiation pattern, elevational and azimuthal beam peak in E-plane and H-plane, beamwidth and maximum directivity are substantially investigated. In addition, these characteristics are also compared among the included angles of 30/spl deg/, 45/spl deg/, 60/spl deg/ and 90/spl deg/ of dihedral corner reflector. The result of the analysis is very useful to design the antenna of high directivity with unidirectional beam.
{"title":"Dihedral corner reflector antenna excited by a probe inside rectangular ring","authors":"S. Lamultree, C. Phongcharoenpanich, S. Kosulvit, M. Krairiksh","doi":"10.1109/APCC.2003.1274463","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274463","url":null,"abstract":"This paper proposes a dihedral corner reflector excited by a probe inside rectangular ring. The antenna structure is simple. The radiation characteristics of the antenna for various spacing between a probe inside rectangular ring and the dihedral corner reflector are analyzed. The numerical results of the radiation pattern, elevational and azimuthal beam peak in E-plane and H-plane, beamwidth and maximum directivity are substantially investigated. In addition, these characteristics are also compared among the included angles of 30/spl deg/, 45/spl deg/, 60/spl deg/ and 90/spl deg/ of dihedral corner reflector. The result of the analysis is very useful to design the antenna of high directivity with unidirectional beam.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121746529","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274454
E. S. Oh
Disasters, be it natural or man-made, have caused tremendous human sufferings and property damage each year. On the other hand, advances in information and communication technologies (ICT) have brought about unprecedented convenience and possibilities. Over the past decade, the international community has come to realise the critical role that ICT can play in mitigating the impact of disasters. This recognition resulted in the adoption of the Tampere Convention (Treaty) on "emergency telecommunications", which creates an international framework for the provision of telecommunications resources for disaster mitigations and relief operations. The present paper first reviews the role that the international efforts for emergency telecommunications can play in countering and mitigating disasters, thereby providing a safe and secured environment for sustainable ICT development. Finally, the paper will issue a call to arms to both the public and private sectors to join hand in the noble effort of utilising modern ICT for mitigating disasters.
{"title":"Information and communication technology in the service of disaster mitigation and humanitarian relief","authors":"E. S. Oh","doi":"10.1109/APCC.2003.1274454","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274454","url":null,"abstract":"Disasters, be it natural or man-made, have caused tremendous human sufferings and property damage each year. On the other hand, advances in information and communication technologies (ICT) have brought about unprecedented convenience and possibilities. Over the past decade, the international community has come to realise the critical role that ICT can play in mitigating the impact of disasters. This recognition resulted in the adoption of the Tampere Convention (Treaty) on \"emergency telecommunications\", which creates an international framework for the provision of telecommunications resources for disaster mitigations and relief operations. The present paper first reviews the role that the international efforts for emergency telecommunications can play in countering and mitigating disasters, thereby providing a safe and secured environment for sustainable ICT development. Finally, the paper will issue a call to arms to both the public and private sectors to join hand in the noble effort of utilising modern ICT for mitigating disasters.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122701978","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274440
K. Cho, Tae-Jun Park, Heyung-sub Lee, Hyeongho Lee, Won Don Lee
This paper describes the system structure for accommodating storage networking service in optical access system and the method of communication processing for providing through-connection between optical access system and iSCSI (Internet Small Computer Systems Interface) subscriber. The basic idea to implement the system is to use existing gigabit Ethernet technology products currently in service, and to develop a new iSCSI interworking part. We focused our attention on how the commonality of hardware and software architecture among different types of interworking units could be accomplished. The proposed concept of storage interworking architecture will provide flexibility to accommodate with storage networking service.
本文介绍了在光接入系统中容纳存储网络业务的系统结构，以及提供光接入系统与iSCSI (Internet Small Computer Systems Interface, Internet小型计算机接口)用户间直通连接的通信处理方法。系统实现的基本思路是利用现有的千兆以太网技术产品，开发一种新的iSCSI互联部分。我们将注意力集中在如何在不同类型的互联单元之间实现硬件和软件架构的通用性。提出的存储互联架构概念将提供适应存储网络服务的灵活性。
{"title":"A method for accommodating storage service in optical access system","authors":"K. Cho, Tae-Jun Park, Heyung-sub Lee, Hyeongho Lee, Won Don Lee","doi":"10.1109/APCC.2003.1274440","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274440","url":null,"abstract":"This paper describes the system structure for accommodating storage networking service in optical access system and the method of communication processing for providing through-connection between optical access system and iSCSI (Internet Small Computer Systems Interface) subscriber. The basic idea to implement the system is to use existing gigabit Ethernet technology products currently in service, and to develop a new iSCSI interworking part. We focused our attention on how the commonality of hardware and software architecture among different types of interworking units could be accomplished. The proposed concept of storage interworking architecture will provide flexibility to accommodate with storage networking service.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122875608","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274383
E. Karami, M. Shiva
In this paper, a new iterative joint detection and decoding algorithm is proposed for coded orthogonal frequency division multiplexed (OFDM) signals in multiple-input multiple- output (MIMO) channels. The proposed receiver is comprised of a MIMO maximum a posteriori (MAP) detection followed by parallel soft-in soft-out decoders. The proposed receiver is used for turbo coded MIMO-OFDM signals. Through various simulations, it is confirmed that the proposed receiver is fast and efficient even in high rank MIMO channels.
{"title":"MAP detection of coded MIMO-OFDM signals","authors":"E. Karami, M. Shiva","doi":"10.1109/APCC.2003.1274383","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274383","url":null,"abstract":"In this paper, a new iterative joint detection and decoding algorithm is proposed for coded orthogonal frequency division multiplexed (OFDM) signals in multiple-input multiple- output (MIMO) channels. The proposed receiver is comprised of a MIMO maximum a posteriori (MAP) detection followed by parallel soft-in soft-out decoders. The proposed receiver is used for turbo coded MIMO-OFDM signals. Through various simulations, it is confirmed that the proposed receiver is fast and efficient even in high rank MIMO channels.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131386537","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}
Pub Date : 2003-09-21DOI: 10.1109/APCC.2003.1274481
Zhen Song, Zhoujun Li, Wenhua Dou
Security goals should be parts of the description of security protocols. If the security goal cannot be precisely described in the narration, formal verification will lose its sense. But unlike secrecy, authentication property is rarely made clear precisely what it means. Various approaches were previously proposed for the formal definition of authentication property. This article describes taxonomy of these different definitions and discusses their respective problems. It is intended to be a survey and arise some deeper research.
{"title":"Different approaches for the formal definition of authentication property","authors":"Zhen Song, Zhoujun Li, Wenhua Dou","doi":"10.1109/APCC.2003.1274481","DOIUrl":"https://doi.org/10.1109/APCC.2003.1274481","url":null,"abstract":"Security goals should be parts of the description of security protocols. If the security goal cannot be precisely described in the narration, formal verification will lose its sense. But unlike secrecy, authentication property is rarely made clear precisely what it means. Various approaches were previously proposed for the formal definition of authentication property. This article describes taxonomy of these different definitions and discusses their respective problems. It is intended to be a survey and arise some deeper research.","PeriodicalId":277507,"journal":{"name":"9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133576409","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}
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