The Experts below are selected from a list of 4515 Experts worldwide ranked by ideXlab platform
Junde Song - One of the best experts on this subject based on the ideXlab platform.
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Research on Context-Awareness Service Adaptation Mechanism in IMS under Ubiquitous Network
2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 2012Co-Authors: Wen-an Zhou, Jie Chang, Junde SongAbstract:The service adaptation mechanism is one of the key issues in Ubiquitous Network. However, most of the proposed approaches of service adaptation are either not context-aware or based on a specific definition of context in specific environment. This paper presents a context-aware service adaptation mechanism under Ubiquitous Network relying on user-to-object, space-time interaction patterns which helps perform service adaptation according to user's contexts (such as preferences and habits), Network context, service context and device context. The contribution of this paper is to propose: 1) importing user similarity into the service adaptation process and also considering users' trust value; 2) similar users-based service adaptation algorithm (SUSA) is proposed, by combining entropy theory and fuzzy analytic hierarchy process algorithm (FAHP). Evaluation results show that the service adaptation approach based on context-aware, user similarity and SUSA algorithm outperforms the traditional service adaptation algorithm in the accuracy aspect.
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WCNC - Multi-device service continuity with adaptive resources provisioning under Ubiquitous Network
2012 IEEE Wireless Communications and Networking Conference (WCNC), 2012Co-Authors: Jie Chang, Wen-an Zhou, Junde SongAbstract:The service continuity mechanism is to provide multimedia application with seamless multimedia experience over multiple Networks (Wifi, 3G, Wimax, LTE) as well as multiple devices (mobile, PCs, PDA, Settop box) in Ubiquitous Network. However, most of the proposed approaches of service continuity are either not adaptive resources provisioning or based on a specific definition of context in Ubiquitous Network environment. This paper presents a multi-device service continuity with adaptive resources provisioning mechanism under Ubiquitous Network relying on IMS which helps perform service continuity according to user's contexts (such as preferences and habits), Network context, service context and device context. The contribution of this paper is to propose: 1) service continuity scenario, architecture and requirements; 2) signaling flow of resource switching for the proposed scenario is proposed; 3) process of adaptive resources provisioning is put forward. Evaluation results show that the service continuity approach based on context-aware, multi-device coordination and adaptive resources provisioning process outperforms the traditional service continuity.
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Multi-device service continuity with adaptive resources provisioning under Ubiquitous Network
IEEE Wireless Communications and Networking Conference WCNC, 2012Co-Authors: Jie Chang, Wen-an Zhou, Junde SongAbstract:The service continuity mechanism is to provide multimedia application with seamless multimedia experience over multiple Networks (Wifi, 3G, Wimax, LTE) as well as multiple devices (mobile, PCs, PDA, Settop box) in Ubiquitous Network. However, most of the proposed approaches of service continuity are either not adaptive resources provisioning or based on a specific definition of context in Ubiquitous Network environment. This paper presents a multi-device service continuity with adaptive resources provisioning mechanism under Ubiquitous Network relying on IMS which helps perform service continuity according to user's contexts (such as preferences and habits), Network context, service context and device context. The contribution of this paper is to propose: 1) service continuity scenario, architecture and requirements; 2) signaling flow of resource switching for the proposed scenario is proposed; 3) process of adaptive resources provisioning is put forward. Evaluation results show that the service continuity approach based on context-aware, multi-device coordination and adaptive resources provisioning process outperforms the traditional service continuity.
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Performance Improvements of mSCTP-CMT in Ubiquitous Network Scenarios
2011 IEEE Vehicular Technology Conference (VTC Fall), 2011Co-Authors: Jie Chang, Wen-an Zhou, Junde SongAbstract:With the rapid development of wireless broadband services and the steady advancement of Ubiquitous Network, there is a rising demand for multi-homed Network sites to provide services. Mobile Stream Control Transmission Protocol (mSCTP) is ideal to provide vertical handover (VHO) feature by enabling a mobile client to freely switch between IP addresses acquired in different Networks. Concurrent Multipath Transfer with mSCTP's multi-homing support (mSCTP-CMT), which is the extension of mSCTP protocol, simultaneously transmits new data from a source host to a destination host via two or more end-to-end paths. This paper proposes bandwidth estimation extension and congestion control modifications for mSCTP-CMT to improve the transmission throughput in Ubiquitous Network scenarios. In the proposed scheme, the main contribution is that improved Non-Renegable Selective Acknowledgments (NR-SACKs) based on available bandwidth estimation and its congestion control mechanism which can efficiently utilize of send buffer, especially when frequency of loss events. From the simulation test, we can see that the performance of the proposed scheme could improve the application throughput under packet loss rate and time varied.
Osamu Kagami - One of the best experts on this subject based on the ideXlab platform.
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Results of field trials with wide-area Ubiquitous Network
2012 IEEE MTT-S International Microwave Symposium Digest, 2012Co-Authors: Hitoshi Hayashi, Osamu Kagami, Mitsuru HaradaAbstract:For the “Internet of Things,” wireless devices are required that have small size, long life, and long range communication capability. One technology that meets these requirements is the wide-area Ubiquitous Network. This paper reports the field trials conducted over three years; services were remote reading / remote control of gas meters and bicycle management (location estimation / radio reachability). The test results confirm that the Network can well support remote monitoring service.
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wireless access system for wide area Ubiquitous Network
IEEE Sensors, 2009Co-Authors: Yoshitaka Shimizu, Shigeru Kuwano, Daisei Uchida, Fusao Nuno, Shinya Ishihara, Osamu KagamiAbstract:This paper introduces a wireless access system for the Wide Area Ubiquitous Network (WAUN), which is a large cell-based public sensor Network, and provides feasibility study results gained through field tests. The wireless access system uses several key technologies to accommodate widely dispersed small simple terminals. First, to realize the large cell radius of several kilometers, space and site diversity technique based on digital radio over optical fiber (DROF) is developed. Second, an intelligent multiple access control scheme, a combination of demand assignment and random access, is employed to effectively accommodate tens of thousand of wireless terminals (WTs) per cell. Finally, techniques that yield low power consumption are introduced to create the long WT lifetimes needed. The system performance realized by the above-mentioned technologies is confirmed by field tests.
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Wide area Ubiquitous Network: The Network operator's view of a sensor Network
IEEE Communications Magazine, 2008Co-Authors: Hiroshi Saito, Osamu Kagami, Masahiro Umehira, Yuichi KadoAbstract:This article describes a Network concept called the wide area Ubiquitous Network (WAUN) and its research activities. WAUN is a Network for sensors and actuators, and can support low-end wireless terminals, which are expected to be used for new applications. Among the many types of R&D being performed in the WAUN project, this article focuses on the feasibility of its basic feature and target. The basic feature is "wide coverage using very-low-power-consumption terminals," and its specific target is a "5-km cell radius using 10-mW transmission power terminals with a battery life of 10 years." The results of a basic field experiment and a laboratory experiment suggest that the target seems to be feasible using wireless technologies such as diversity reception (with additional future effort to improve the packet error rate for use in business districts) and LSI technologies such as a power switch fabricated in a CMOS/SOI LSI.
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Concept and Feasibility Study of Wide Area Ubiquitous Network for Sensors and Actuators
2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007Co-Authors: Masahiro Umehira, Osamu Kagami, Hiroshi Saito, Takafumi Fujita, Yosuke FujinoAbstract:The wide area Ubiquitous Network (WAUN), which is used for transmitting and receiving information for sensors and actuators, is proposed and the feasibility study of a new wireless Network for the WAUN is described. The WAUN is designed to satisfy the requirements of many new applications using sensors and actuators, which are wirelessly connected to the IP Network. One of the basic requirements for the wireless system of the WAUN is wide coverage larger than several km with low wireless terminal output power of 10 mW To meet this requirement, an experimental wireless system, which uses a powerful FEC and the diversity technique, for use in WAUNs is designed, and its feasibility is evaluated by field experiments. The experimental results demonstrate the feasibility of the WAUN. That is, the 10 mW transmission power wireless terminal communicates with the access point (base station) 5 km away
Hiroshi Saito - One of the best experts on this subject based on the ideXlab platform.
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Machine-to-Machine communications as a new revenue source of Network operators
The 15th International Symposium on Wireless Personal Multimedia Communications, 2012Co-Authors: Hiroshi SaitoAbstract:This paper discusses the background and current situation of the Machine-to-Machine (M2M) communications market, as well as the requirements and features of new Network services to be used for M2M applications. It also describes the Wide Area Ubiquitous Network (WAUN) as an example of such a Network.
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Wide area Ubiquitous Network: The Network operator's view of a sensor Network
IEEE Communications Magazine, 2008Co-Authors: Hiroshi Saito, Osamu Kagami, Masahiro Umehira, Yuichi KadoAbstract:This article describes a Network concept called the wide area Ubiquitous Network (WAUN) and its research activities. WAUN is a Network for sensors and actuators, and can support low-end wireless terminals, which are expected to be used for new applications. Among the many types of R&D being performed in the WAUN project, this article focuses on the feasibility of its basic feature and target. The basic feature is "wide coverage using very-low-power-consumption terminals," and its specific target is a "5-km cell radius using 10-mW transmission power terminals with a battery life of 10 years." The results of a basic field experiment and a laboratory experiment suggest that the target seems to be feasible using wireless technologies such as diversity reception (with additional future effort to improve the packet error rate for use in business districts) and LSI technologies such as a power switch fabricated in a CMOS/SOI LSI.
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Concept and Feasibility Study of Wide Area Ubiquitous Network for Sensors and Actuators
2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007Co-Authors: Masahiro Umehira, Osamu Kagami, Hiroshi Saito, Takafumi Fujita, Yosuke FujinoAbstract:The wide area Ubiquitous Network (WAUN), which is used for transmitting and receiving information for sensors and actuators, is proposed and the feasibility study of a new wireless Network for the WAUN is described. The WAUN is designed to satisfy the requirements of many new applications using sensors and actuators, which are wirelessly connected to the IP Network. One of the basic requirements for the wireless system of the WAUN is wide coverage larger than several km with low wireless terminal output power of 10 mW To meet this requirement, an experimental wireless system, which uses a powerful FEC and the diversity technique, for use in WAUNs is designed, and its feasibility is evaluated by field experiments. The experimental results demonstrate the feasibility of the WAUN. That is, the 10 mW transmission power wireless terminal communicates with the access point (base station) 5 km away
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Recent Developments in Wide Area Ubiquitous Network Research
Eighth International Symposium on Autonomous Decentralized Systems (ISADS'07), 2007Co-Authors: Hiroshi Saito, Koichi TakasugiAbstract:We have presented a new Network called the wide area Ubiquitous Network (WAUN) for Ubiquitously Networking small devices such as sensors and actuators through a long low-bit-rate wireless link. We set the WAUN basic design requirements to be "low cost, low power consumption, and supporting low-end terminals" and started R&D of the WAUN. Our efforts toward R&D of the WAUN include various areas such as Network systems, wireless systems, wireless terminals, and applications. This paper describes them
Jairo A. Gutiérrez - One of the best experts on this subject based on the ideXlab platform.
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Survey: Pricing Ubiquitous Network Services
Encyclopedia of Internet Technologies and Applications, 2020Co-Authors: Jairo A. GutiérrezAbstract:One of the keys for the success of Ubiquitous Network services is the issue of assigning prices to those services. Furthermore, Ubiquitous services based on a Network of complementary technologies, both fixed and wireless, have created the expectation of services that can be obtained dynamically and automatically with the minimum possible of interaction between the users and potentially complex Network systems. Intelligent agents would negotiate the best conditions to make sure the user obtains the best possible connection always (Voinov & Valladares, 2003). This best possible connection would be selected by comparing the different services, quality of the services offered, and prices, then reaching a decision based on the policies the user has configured in his or her intelligent agent and in conjunction with the policies being presented by the different service providers.
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Policy-Based Network Management as a Platform for the Pricing of Ubiquitous Network Services
2008 IEEE International Symposium on Parallel and Distributed Processing with Applications, 2008Co-Authors: Jairo A. GutiérrezAbstract:Next-generation Networks have the potential to service users without pre-existing contractual arrangements by using readily accessible pricing policies. The key issue is how to enable ad-hoc users to learn about the policies offered by a particular provider and to facilitate a negotiation between the provider and the potential user. Researchers working on the pricing of Network services have offered solutions based on game theory techniques, market-based mechanisms (for example auctions) and techniques based on mesh Networks among others. We argue that the Network Management field, and in particular, the policy based management paradigm provides excellent ideas that can be borrowed and adapted to the field of Ubiquitous or pervasive services pricing. This paper explores the prospects of using policy-based mechanisms to adequately price Ubiquitous Network services.
Jie Chang - One of the best experts on this subject based on the ideXlab platform.
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Research on Context-Awareness Service Adaptation Mechanism in IMS under Ubiquitous Network
2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 2012Co-Authors: Wen-an Zhou, Jie Chang, Junde SongAbstract:The service adaptation mechanism is one of the key issues in Ubiquitous Network. However, most of the proposed approaches of service adaptation are either not context-aware or based on a specific definition of context in specific environment. This paper presents a context-aware service adaptation mechanism under Ubiquitous Network relying on user-to-object, space-time interaction patterns which helps perform service adaptation according to user's contexts (such as preferences and habits), Network context, service context and device context. The contribution of this paper is to propose: 1) importing user similarity into the service adaptation process and also considering users' trust value; 2) similar users-based service adaptation algorithm (SUSA) is proposed, by combining entropy theory and fuzzy analytic hierarchy process algorithm (FAHP). Evaluation results show that the service adaptation approach based on context-aware, user similarity and SUSA algorithm outperforms the traditional service adaptation algorithm in the accuracy aspect.
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WCNC - Multi-device service continuity with adaptive resources provisioning under Ubiquitous Network
2012 IEEE Wireless Communications and Networking Conference (WCNC), 2012Co-Authors: Jie Chang, Wen-an Zhou, Junde SongAbstract:The service continuity mechanism is to provide multimedia application with seamless multimedia experience over multiple Networks (Wifi, 3G, Wimax, LTE) as well as multiple devices (mobile, PCs, PDA, Settop box) in Ubiquitous Network. However, most of the proposed approaches of service continuity are either not adaptive resources provisioning or based on a specific definition of context in Ubiquitous Network environment. This paper presents a multi-device service continuity with adaptive resources provisioning mechanism under Ubiquitous Network relying on IMS which helps perform service continuity according to user's contexts (such as preferences and habits), Network context, service context and device context. The contribution of this paper is to propose: 1) service continuity scenario, architecture and requirements; 2) signaling flow of resource switching for the proposed scenario is proposed; 3) process of adaptive resources provisioning is put forward. Evaluation results show that the service continuity approach based on context-aware, multi-device coordination and adaptive resources provisioning process outperforms the traditional service continuity.
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Multi-device service continuity with adaptive resources provisioning under Ubiquitous Network
IEEE Wireless Communications and Networking Conference WCNC, 2012Co-Authors: Jie Chang, Wen-an Zhou, Junde SongAbstract:The service continuity mechanism is to provide multimedia application with seamless multimedia experience over multiple Networks (Wifi, 3G, Wimax, LTE) as well as multiple devices (mobile, PCs, PDA, Settop box) in Ubiquitous Network. However, most of the proposed approaches of service continuity are either not adaptive resources provisioning or based on a specific definition of context in Ubiquitous Network environment. This paper presents a multi-device service continuity with adaptive resources provisioning mechanism under Ubiquitous Network relying on IMS which helps perform service continuity according to user's contexts (such as preferences and habits), Network context, service context and device context. The contribution of this paper is to propose: 1) service continuity scenario, architecture and requirements; 2) signaling flow of resource switching for the proposed scenario is proposed; 3) process of adaptive resources provisioning is put forward. Evaluation results show that the service continuity approach based on context-aware, multi-device coordination and adaptive resources provisioning process outperforms the traditional service continuity.
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Performance Improvements of mSCTP-CMT in Ubiquitous Network Scenarios
2011 IEEE Vehicular Technology Conference (VTC Fall), 2011Co-Authors: Jie Chang, Wen-an Zhou, Junde SongAbstract:With the rapid development of wireless broadband services and the steady advancement of Ubiquitous Network, there is a rising demand for multi-homed Network sites to provide services. Mobile Stream Control Transmission Protocol (mSCTP) is ideal to provide vertical handover (VHO) feature by enabling a mobile client to freely switch between IP addresses acquired in different Networks. Concurrent Multipath Transfer with mSCTP's multi-homing support (mSCTP-CMT), which is the extension of mSCTP protocol, simultaneously transmits new data from a source host to a destination host via two or more end-to-end paths. This paper proposes bandwidth estimation extension and congestion control modifications for mSCTP-CMT to improve the transmission throughput in Ubiquitous Network scenarios. In the proposed scheme, the main contribution is that improved Non-Renegable Selective Acknowledgments (NR-SACKs) based on available bandwidth estimation and its congestion control mechanism which can efficiently utilize of send buffer, especially when frequency of loss events. From the simulation test, we can see that the performance of the proposed scheme could improve the application throughput under packet loss rate and time varied.
