There are many approaches in literatures using the knowledge of time delay to locate the user position in WLAN system. All of them have to modify the existing WLAN infrastructure. The scales of modifications are made on hardware up to the changes in protocol of WLAN. Hence, it is an unattractive approach to use time delay for positioning system. In this paper, the new concept of utilizing time day of successful transmission to locate the position of WLAN user is presented. The advantage of using the proposed technique is no extra modification necessarily appended in the existing system. The measurement results confirm the validation of proposed concept.
{"title":"A Novel WLAN Positioning Technique Employing Time Delay of Successful Transmission","authors":"P. Uthansakul, M. Uthansakul","doi":"10.1109/NGMAST.2008.23","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.23","url":null,"abstract":"There are many approaches in literatures using the knowledge of time delay to locate the user position in WLAN system. All of them have to modify the existing WLAN infrastructure. The scales of modifications are made on hardware up to the changes in protocol of WLAN. Hence, it is an unattractive approach to use time delay for positioning system. In this paper, the new concept of utilizing time day of successful transmission to locate the position of WLAN user is presented. The advantage of using the proposed technique is no extra modification necessarily appended in the existing system. The measurement results confirm the validation of proposed concept.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122772199","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}
There is no doubt that the traditional value chain of the telecommunications industry is facing significant pressure due to the convergence of Internet and Telecom worlds, in particular at the service layer. The telecommunications industry has failed so far to deliver on the promise of rapid application development whereby untrusted third parties have the ability to create innovative services that are delivered over NGN platforms. The relevance of standardisation bodies such as the Open Mobile Alliance (OMA) is also being challenged by so-called "Web 2.0" technologies and de-facto standardisation efforts on the Internet. In the face of a rapidly changing technology landscape and increasing pressure to accept "Internet" models, the telecommunications industry must embrace open source methodologies in the standardisation process. This paper covers a potential governance structure for utilising OSS techniques using the OMA as an example.
{"title":"Embracing Open Source Methods for the Standardization of NGN Services and Enablers","authors":"Catherine Mulligan","doi":"10.1109/NGMAST.2008.90","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.90","url":null,"abstract":"There is no doubt that the traditional value chain of the telecommunications industry is facing significant pressure due to the convergence of Internet and Telecom worlds, in particular at the service layer. The telecommunications industry has failed so far to deliver on the promise of rapid application development whereby untrusted third parties have the ability to create innovative services that are delivered over NGN platforms. The relevance of standardisation bodies such as the Open Mobile Alliance (OMA) is also being challenged by so-called \"Web 2.0\" technologies and de-facto standardisation efforts on the Internet. In the face of a rapidly changing technology landscape and increasing pressure to accept \"Internet\" models, the telecommunications industry must embrace open source methodologies in the standardisation process. This paper covers a potential governance structure for utilising OSS techniques using the OMA as an example.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114149602","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}
Vehicular Ad hoc Networks (VANETs) are new network environment for intelligent transportation systems. Many of applications in VANETs are based on dissemination of information, so broadcasting is one of the fundamental services in these networks. Broadcasting in VANET is a challenging task since these networks often lack continuous end-to-end connectivity and also have different road topologies. In this paper we present a broadcast method that improves the reception rates of broadcast messages by overcoming problem of connectivity gaps and omitting unreliability that occurs at intersections. We have simulated our method in NS2, simulation results show our method delivers message to most of vehicles by assuring propagating message in all roads and passing connectivity gaps.
{"title":"A Reliable Broadcast Method for Vehicular Ad Hoc Networks Considering Fragmentation and Intersection Problems","authors":"S. Khakbaz, Mahmood Fathy","doi":"10.1109/NGMAST.2008.93","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.93","url":null,"abstract":"Vehicular Ad hoc Networks (VANETs) are new network environment for intelligent transportation systems. Many of applications in VANETs are based on dissemination of information, so broadcasting is one of the fundamental services in these networks. Broadcasting in VANET is a challenging task since these networks often lack continuous end-to-end connectivity and also have different road topologies. In this paper we present a broadcast method that improves the reception rates of broadcast messages by overcoming problem of connectivity gaps and omitting unreliability that occurs at intersections. We have simulated our method in NS2, simulation results show our method delivers message to most of vehicles by assuring propagating message in all roads and passing connectivity gaps.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128965787","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}
J. Hautakorpi, A. Salinas, E. Harjula, M. Ylianttila
Interpersonal communication using the information networks can be accomplished in many different ways. Users may communicate, for example, by using a specific communication application on an end-user terminal, typical mobile phone, or IP Multimedia Subsystem (IMS) client. Quite often there is no interconnection mechanisms between these different communication methods, and this is emphasized with regards to various communication applications. We propose an architecture for interconnecting Peer-to-peer Session Initiation Protocol (P2PSIP) and IMS networks. The actual gateway, that enables the interconnection, is seen as a peer in the P2PSIP side and as an application server (AS) in the IMS side. Furthermore, we present a prototype from the proposed interconnection architecture.
{"title":"Interconnecting P2PSIP and IMS","authors":"J. Hautakorpi, A. Salinas, E. Harjula, M. Ylianttila","doi":"10.1109/NGMAST.2008.60","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.60","url":null,"abstract":"Interpersonal communication using the information networks can be accomplished in many different ways. Users may communicate, for example, by using a specific communication application on an end-user terminal, typical mobile phone, or IP Multimedia Subsystem (IMS) client. Quite often there is no interconnection mechanisms between these different communication methods, and this is emphasized with regards to various communication applications. We propose an architecture for interconnecting Peer-to-peer Session Initiation Protocol (P2PSIP) and IMS networks. The actual gateway, that enables the interconnection, is seen as a peer in the P2PSIP side and as an application server (AS) in the IMS side. Furthermore, we present a prototype from the proposed interconnection architecture.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129885983","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}
This paper presents a practice based learning model. This model allows learners practice the learning content according to the forgetting curve. The reinforce phase of the learning is performed through a sequence of mini-practice unit, which boost the memory against forgetting. The model is designed on mobile platform like tablets or PDAs. Learners are able to practice on buses, at beach or during the interval of play ground games. Simulation result shows that it can be significantly improve the learning performance.
{"title":"Mobile Learning against Forgetting","authors":"Yuan Miao","doi":"10.1109/NGMAST.2008.87","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.87","url":null,"abstract":"This paper presents a practice based learning model. This model allows learners practice the learning content according to the forgetting curve. The reinforce phase of the learning is performed through a sequence of mini-practice unit, which boost the memory against forgetting. The model is designed on mobile platform like tablets or PDAs. Learners are able to practice on buses, at beach or during the interval of play ground games. Simulation result shows that it can be significantly improve the learning performance.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123648422","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}
S. Arkoulis, L. Kazatzopoulos, C. Delakouridis, G. Marias
The current trend for opportunistic use of the licensed or licensed-exempt wireless spectrum with limited rules, or even without rules, introduces significant scientific and technical challenges for the networks of the future. Until now, for the realization of the cognitive radio paradigm, several spectrum sharing schemes have been proposed, such as centralized and distributed schemes, and cooperative or noncooperative spectrum sharing mechanisms. Unfortunately, some of the existing proposals for spectrum sharing and management introduce significant security leakages, putting into effect unfairness, unavailability, and selfishness, or even malicious behaviors. Additionally, the identification, recording and reporting of selfish, free-riders, malicious and anomalous actions by peers is still an open issue in the majority of the existing spectrum management schemes. This paper discusses and classifies the weak points and the vulnerabilities of the spectrum sharing mechanisms.
{"title":"Cognitive Spectrum and Its Security Issues","authors":"S. Arkoulis, L. Kazatzopoulos, C. Delakouridis, G. Marias","doi":"10.1109/NGMAST.2008.102","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.102","url":null,"abstract":"The current trend for opportunistic use of the licensed or licensed-exempt wireless spectrum with limited rules, or even without rules, introduces significant scientific and technical challenges for the networks of the future. Until now, for the realization of the cognitive radio paradigm, several spectrum sharing schemes have been proposed, such as centralized and distributed schemes, and cooperative or noncooperative spectrum sharing mechanisms. Unfortunately, some of the existing proposals for spectrum sharing and management introduce significant security leakages, putting into effect unfairness, unavailability, and selfishness, or even malicious behaviors. Additionally, the identification, recording and reporting of selfish, free-riders, malicious and anomalous actions by peers is still an open issue in the majority of the existing spectrum management schemes. This paper discusses and classifies the weak points and the vulnerabilities of the spectrum sharing mechanisms.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126529326","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}
K. Kazaura, P. Dat, A. Shah, Toshiji Suzuki, K. Wakamori, M. Matsumoto, T. Higashino, K. Tsukamoto, S. Komaki
With the continuous emergence of new innovative wireless technologies, standards, services and applications, there is an increase demand for technologies, preferably broadband, for providing seamless connectivity between the various networks elements. This paper proposes an innovative Radio over Free-Space Optics (RoFSO) communication system having potential to be a cost-effective and reliable technology for bridging these various networks facilities. The proposed system can be utilized as a next generation access technology suitable for transmission of heterogeneous wireless service signals especially in areas which lack broadband connectivity. Using an experimental free-space optical (FSO) communication system capable of transmitting RF signals, we conduct initial investigations focusing on studying the deployment environment characteristics which influence the performance of RoFSO systems. Preliminary propagation measurement results characterizing the effects of atmospheric influence on transmission of RF signal using FSO links are presented. The results show that in the absence of strong atmospheric turbulence or severe weather conditions, RoFSO system can effectively be used as access technology for transmission of broadband heterogeneous wireless services signals.
{"title":"Studies on a Next Generation Access Technology Using Radio over Free-Space Optic Links","authors":"K. Kazaura, P. Dat, A. Shah, Toshiji Suzuki, K. Wakamori, M. Matsumoto, T. Higashino, K. Tsukamoto, S. Komaki","doi":"10.1109/NGMAST.2008.54","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.54","url":null,"abstract":"With the continuous emergence of new innovative wireless technologies, standards, services and applications, there is an increase demand for technologies, preferably broadband, for providing seamless connectivity between the various networks elements. This paper proposes an innovative Radio over Free-Space Optics (RoFSO) communication system having potential to be a cost-effective and reliable technology for bridging these various networks facilities. The proposed system can be utilized as a next generation access technology suitable for transmission of heterogeneous wireless service signals especially in areas which lack broadband connectivity. Using an experimental free-space optical (FSO) communication system capable of transmitting RF signals, we conduct initial investigations focusing on studying the deployment environment characteristics which influence the performance of RoFSO systems. Preliminary propagation measurement results characterizing the effects of atmospheric influence on transmission of RF signal using FSO links are presented. The results show that in the absence of strong atmospheric turbulence or severe weather conditions, RoFSO system can effectively be used as access technology for transmission of broadband heterogeneous wireless services signals.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125751772","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}
A virtual private network (VPN) can be defined as a way to provide secure communication between members of a group through use of the public telecommunication infrastructure, maintaining privacy through the use of a tunneling protocol and security procedures. This work examines and empirically evaluates the remote access VPNs, namely point to point tunneling protocol (PPTP), layer 2 tunneling protocol over Internet protocol security (L2TP/IPSec), and secure socket layer (SSL). We explore the impact of these VPNs on end-to-end user application performance using metrics such as throughput, RTT, jitter, and packet loss. All experiments were conducted using wired and wireless windows XP SP/2 host (VPN client) connected to a windows server 2003 host (VPN server).
虚拟专用网(VPN)可以定义为通过使用公共电信基础设施在组成员之间提供安全通信的一种方式，通过使用隧道协议和安全程序来维护隐私。本研究考察并实证评估了远程接入vpn，即点对点隧道协议(PPTP)、基于互联网协议安全(L2TP/IPSec)的第二层隧道协议和安全套接字层(SSL)。我们使用吞吐量、RTT、抖动和数据包丢失等指标来探讨这些vpn对端到端用户应用程序性能的影响。所有实验均通过有线和无线windows XP SP/2主机(VPN客户端)与windows server 2003主机(VPN服务器)连接进行。
{"title":"Performance Evaluation for Remote Access VPNs on Windows Server 2003","authors":"A.A. Jaha, F. Ben Shatwan, M. Ashibani","doi":"10.1109/NGMAST.2008.17","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.17","url":null,"abstract":"A virtual private network (VPN) can be defined as a way to provide secure communication between members of a group through use of the public telecommunication infrastructure, maintaining privacy through the use of a tunneling protocol and security procedures. This work examines and empirically evaluates the remote access VPNs, namely point to point tunneling protocol (PPTP), layer 2 tunneling protocol over Internet protocol security (L2TP/IPSec), and secure socket layer (SSL). We explore the impact of these VPNs on end-to-end user application performance using metrics such as throughput, RTT, jitter, and packet loss. All experiments were conducted using wired and wireless windows XP SP/2 host (VPN client) connected to a windows server 2003 host (VPN server).","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"363 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115967687","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}
Multi-homing is increasingly being employed by large enterprises to extract good performance and reliability from their connections. The integration of existing and emerging heterogeneous wireless networks requires the design of intelligent failure detection and recovery schemes to enable mobile users to switch between networks and experience uninterrupted service continuity anywhere, anytime. Real deployment of such mobility strategies remains a significant challenge. This paper, introduces a novel scheme "global controller" that is a technique operating with mobile IP version 6 (MIPv6) global addresses. Aims to reduce the number of dropped data packets, the mobile device will face during its communication with its destination while moving away from its home network, keeping in mind providing mobility over a wide range of access technologies. A careful selection of a better Wireless LAN is important to realize the performance improvements for voice over IP(VoIP) applications. Our analysis shows that multi-homing and switching between WLANs and cleverly scheduling traffic across the networks that can improve the mobile node throughput and utilization by up to 20%, and reduce the traffic queuing delay by up to 25% compared to a use of a single network.
{"title":"A Novel Mechanism to Select Better Multi-homed MIPv6 Networks","authors":"Z. Jerjees, H. Al-Raweshidy","doi":"10.1109/NGMAST.2008.58","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.58","url":null,"abstract":"Multi-homing is increasingly being employed by large enterprises to extract good performance and reliability from their connections. The integration of existing and emerging heterogeneous wireless networks requires the design of intelligent failure detection and recovery schemes to enable mobile users to switch between networks and experience uninterrupted service continuity anywhere, anytime. Real deployment of such mobility strategies remains a significant challenge. This paper, introduces a novel scheme \"global controller\" that is a technique operating with mobile IP version 6 (MIPv6) global addresses. Aims to reduce the number of dropped data packets, the mobile device will face during its communication with its destination while moving away from its home network, keeping in mind providing mobility over a wide range of access technologies. A careful selection of a better Wireless LAN is important to realize the performance improvements for voice over IP(VoIP) applications. Our analysis shows that multi-homing and switching between WLANs and cleverly scheduling traffic across the networks that can improve the mobile node throughput and utilization by up to 20%, and reduce the traffic queuing delay by up to 25% compared to a use of a single network.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131314533","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}
Many of applications in vehicular ad hoc networks (VANET) are based on dissemination of information, so broadcasting is one of the fundamental services in these networks. Most of applications in VANET, especially safety applications, require broadcasting of messages with high reliability in different node densities. In this paper we propose a new broadcast method, which assures broadcasting of message to back and forward directions. To analyzes its performance, it has been evaluated by network simulator (NS2). Simulation results show, this method has high reliability to deliver message in both directions, especially in low node densities.
{"title":"Adding Reliability of Broadcast Methods in Vehicular Ad Hoc Networks","authors":"S. Khakbaz, M. Fathy","doi":"10.1109/NGMAST.2008.94","DOIUrl":"https://doi.org/10.1109/NGMAST.2008.94","url":null,"abstract":"Many of applications in vehicular ad hoc networks (VANET) are based on dissemination of information, so broadcasting is one of the fundamental services in these networks. Most of applications in VANET, especially safety applications, require broadcasting of messages with high reliability in different node densities. In this paper we propose a new broadcast method, which assures broadcasting of message to back and forward directions. To analyzes its performance, it has been evaluated by network simulator (NS2). Simulation results show, this method has high reliability to deliver message in both directions, especially in low node densities.","PeriodicalId":247507,"journal":{"name":"2008 The Second International Conference on Next Generation Mobile Applications, Services, and Technologies","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124200127","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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