The Experts below are selected from a list of 1668 Experts worldwide ranked by ideXlab platform
Suyoung Park - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Session Control Over IMS for Cross-Layer Optimization of Multi-Stream Video
Wireless Personal Communications, 2009Co-Authors: Suyoung ParkAbstract:Cross-layer optimization is an evolutional approach via optimal source and channel resource combinations. It is generally understood that bitstreams can be constructed according to visual importance using multi-stream video in which the base and enhancement layers simultaneously contain visual information of varying importance. In accordance with their importance, radio resources are allocated to each layer for maximal perceptual visual quality using unequal error protection. Nevertheless, a framework for network signalling, which configures each layer using Quality-of-Service (QoS) parameters, has not been presented. This paper proposes a dynamic Session Control protocol over the IP Multimedia Subsystem (IMS) for network adaptation of multi-stream video where the coding mode can be dynamically changed during the duration of service according to the wireless channel dynamics.
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Dynamic Session Control for Scalable Video Coding over IMS
VTC Spring 2008 - IEEE Vehicular Technology Conference, 2008Co-Authors: Suyoung ParkAbstract:At the view of Application layer, there are many researches to achieve the cross-layer optimization with Physical layer. Scalable video coding is good example. Although it is necessary to consider the Session layer which lies halfway between two layers, the research about that is insufficient. We present a feasible solution of dynamic Session Control for scalable video coding over IMS.
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VTC Spring - Dynamic Session Control for Scalable Video Coding over IMS
VTC Spring 2008 - IEEE Vehicular Technology Conference, 2008Co-Authors: Suyoung ParkAbstract:At the view of Application layer, there are many researches to achieve the cross-layer optimization with Physical layer. Scalable video coding is good example. Although it is necessary to consider the Session layer which lies halfway between two layers, the research about that is insufficient. We present a feasible solution of dynamic Session Control for scalable video coding over IMS.
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Control Flow for Multi-Stream Video of Session Layer in IP Multimedia Subsystem
Journal of Broadcast Engineering, 2008Co-Authors: Suyoung ParkAbstract:At the view of Application layer, there are many researches to achieve the cross-layer optimization with Physical layer. Scalable video coding is good example. Although it is necessary to consider the Session layer which lies halfway between two layers, the research about that is insufficient. We present a feasible solution of dynamic Session Control for scalable video coding over IMS.
Kiyoshi Ueda - One of the best experts on this subject based on the ideXlab platform.
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SoICT - Data Redundancy Dynamic Control Method for High Availability Distributed Clusters
Proceedings of the Ninth International Symposium on Information and Communication Technology - SoICT 2018, 2018Co-Authors: Kiyoshi UedaAbstract:For Session Control servers of carriers networks, the scale out type Session Control server architecture that could Control system performance flexibly has been studied. Network anomaly detection technology using autoencoder has attracted attention. An autoencoder is one of the dimensionality reduction algorithm using neural network. We propose methods to prevent data loss when serious trouble occurred in network equipment, such as servers and routers, of a high availability distributed cluster using consistent hashing. The methods Control data redundancy before serious failure of servers or networks occur using anomaly detection technology. We evaluated three anomalous server selection methods by calculation and computer simulation. We also verified the operation of the data redundancy dynamic Control methods by software implementation and operation experiment.
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ICIN - Applying flexibility in scale-out-based web cloud to future telecommunication Session Control systems
2012 16th International Conference on Intelligence in Next Generation Networks, 2012Co-Authors: Hideo Nishimura, Eriko Iwasa, Michio Irie, Masashi Kaneko, Takeshi Fukumoto, Satoshi Kondoh, Kiyoshi UedaAbstract:In traditional telecommunication networks, server resources are statically allocated to Session Control systems based on demand forecasting. However, the open platform on which third party developers provide various applications has recently made demand prediction difficult. In addition, static allocation concerning load peak results in less resource utilization during nonpeak times, and is not capable of handling unexpected demand fluctuation. To enable flexible on-demand resource Control in telecommunication systems that reduces costs, we propose applying a scale-out architecture, which is commonly used in Web systems for resource optimization, to high availability telecommunication systems. We implemented a scale-out-based Session Control server cluster and showed that the number of servers comprising the cluster can be dynamically configured without serious interruption in service. We also confirmed that the performance of the cluster linearly scales to the number of servers, which indicates the feasibility of the scale-out-based telecommunication system architecture.
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Methods for Reducing Load of Dynamic Scaling for Distributed Session Control Servers
2012 9th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT), 2012Co-Authors: Eriko Iwasa, Michio Irie, Masashi Kaneko, Takeshi Fukumoto, Kiyoshi UedaAbstract:We discuss the dynamic scaling of distributed Session Control servers. Dynamic scaling refers to changing the system configuration by servers dynamically joining or leaving. In Session Control servers, availability and real-time processing must be guaranteed. Therefore, dynamic scaling must be achieved while ensuring these requirements. We propose a cluster model that makes it possible for Session Control servers to achieve both scalability and dynamic scaling. One problem when a node joins a server cluster is that the lookup load that occurs when the new node takes over call states makes it impossible to continue processing. Consequently, this overload can reduce service reliability. We propose two methods for reducing the overload and describe their properties. We evaluated the methods in a set of experiments. The evaluation using a Session Initiation Protocol application revealed that dynamic scaling was efficient, which indicates the methods are effective in reducing look-up load.
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Applying flexibility in scale-out-based web cloud to future telecommunication Session Control systems
2012 16th International Conference on Intelligence in Next Generation Networks, 2012Co-Authors: Hideo Nishimura, Eriko Iwasa, Michio Irie, Masashi Kaneko, Takeshi Fukumoto, Satoshi Kondoh, Kiyoshi UedaAbstract:In traditional telecommunication networks, server resources are statically allocated to Session Control systems based on demand forecasting. However, the open platform on which third party developers provide various applications has recently made demand prediction difficult. In addition, static allocation concerning load peak results in less resource utilization during nonpeak times, and is not capable of handling unexpected demand fluctuation. To enable flexible on-demand resource Control in telecommunication systems that reduces costs, we propose applying a scale-out architecture, which is commonly used in Web systems for resource optimization, to high availability telecommunication systems. We implemented a scale-out-based Session Control server cluster and showed that the number of servers comprising the cluster can be dynamically configured without serious interruption in service. We also confirmed that the performance of the cluster linearly scales to the number of servers, which indicates the feasibility of the scale-out-based telecommunication system architecture.
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Rapid Software Image Distribution for Resource Sharing among Highly Available Session Control Server Clusters
2012 9th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT), 2012Co-Authors: Hideo Nishimura, Eriko Iwasa, Masashi Kaneko, Takeshi Fukumoto, Kiyoshi UedaAbstract:The utility computing model enables total resource optimization by consolidating server resources and allocating them to each user on demand. To apply this model to Session Control server clusters composing a carrier-grade telecommunication network for optimization of resource utilization, dynamic software deployment to shared server resources must be done rapidly even when a large number of servers is simultaneously requested. Because a long-time service stoppage due to the lack of resources is unacceptable in the carrier network infrastructure, we propose a rapid software deployment system that distributes a shared software image called a golden boot image to targeted servers using a scalable pipelining single-chain data transfer method we developed. Our system tolerates variability of boot times due to heterogeneity in commercial networks by starting the image transfer in the order of booted servers while taking into account network topology to achieve wire speed. Experimental results with a prototype system showed that the deployment of a 4- GB software image to 29 servers took less than 10 seconds, 1.15 times longer than for deployment to a single server, indicating high scalability. The proposed system also showed tolerance to boot-time variability in simulations.
Jun Sako - One of the best experts on this subject based on the ideXlab platform.
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GLOBECOM - QRP08-2: A Method of User-Level QoS Guarantee by Session Control in Audio-Video Transmission over IP Networks
IEEE Globecom 2006, 2006Co-Authors: Shuji Tasaka, H. Yamada, Jun SakoAbstract:This paper proposes a Session Control method which provides a mechanism to achieve desirable user-level QoS (i.e., perceptual QoS) of audio-video transmission over IP networks. The proposed method, which is referred to as GPSQ (Guarantee of Psychologically Scaled Quality), utilizes a user-level QoS parameter of the interval scale in the psychometric analysis. GPSQ involves four kinds of components: media terminals, a SIP server, a QoS manager and bandwidth-Controllable routers. From the media terminals, the SIP server obtains the information for this Control, which is further delivered to the QoS manager. The QoS manager keeps a database of representative regression lines which express user-level QoS as a function of guaranteed bandwidth of audio and that of video. Using the regression line, the QoS manager calculates necessary guaranteed bandwidth according to user-level QoS specified by the user. Then, the QoS manager sets up routers to guarantee the calculated bandwidth. We implemented GPSQ in a simple experimental network and confirmed its effectiveness.
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A method of user-level QoS guarantee by Session Control in audio-video transmission over IP networks
GLOBECOM - IEEE Global Telecommunications Conference, 2006Co-Authors: Shuji Tasaka, Yoshihiro Ito, H. Yamada, Jun SakoAbstract:This paper proposes a Session Control method which provides a mechanism to achieve desirable user-level QoS (i.e., perceptual QoS) of audio-video transmission over IP networks. The proposed method, which is referred to as GPSQ (Guarantee of Psychologically Scaled Quality), utilizes a user-level QoS parameter of the interval scale in the psychometric analysis. GPSQ involves four kinds of components: media terminals, a SIP server, a QoS manager and bandwidth-Controllable routers. From the media terminals, the SIP server obtains the information for this Control, which is further delivered to the QoS manager. The QoS manager keeps a database of representative regression lines which express user-level QoS as a function of guaranteed bandwidth of audio and that of video. Using the regression line, the QoS manager calculates necessary guaranteed bandwidth according to user-level QoS specified by the user. Then, the QoS manager sets up routers to guarantee the calculated bandwidth. We implemented GPSQ in a simple experimental network and confirmed its effectiveness.
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QRP08-2: A Method of User-Level QoS Guarantee by Session Control in Audio-Video Transmission over IP Networks
IEEE Globecom 2006, 2006Co-Authors: Shuji Tasaka, H. Yamada, Jun SakoAbstract:This paper proposes a Session Control method which provides a mechanism to achieve desirable user-level QoS (i.e., perceptual QoS) of audio-video transmission over IP networks. The proposed method, which is referred to as GPSQ (Guarantee of Psychologically Scaled Quality), utilizes a user-level QoS parameter of the interval scale in the psychometric analysis. GPSQ involves four kinds of components: media terminals, a SIP server, a QoS manager and bandwidth-Controllable routers. From the media terminals, the SIP server obtains the information for this Control, which is further delivered to the QoS manager. The QoS manager keeps a database of representative regression lines which express user-level QoS as a function of guaranteed bandwidth of audio and that of video. Using the regression line, the QoS manager calculates necessary guaranteed bandwidth according to user-level QoS specified by the user. Then, the QoS manager sets up routers to guarantee the calculated bandwidth. We implemented GPSQ in a simple experimental network and confirmed its effectiveness.
Reza Nejabati - One of the best experts on this subject based on the ideXlab platform.
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SIP-empowered optical networks for future IT services and applications
IEEE Communications Magazine, 2009Co-Authors: Franco Callegati, Aldo Campi, Giorgio Corazza, Dimitra Simeonidou, Georgios Zervas, Reza NejabatiAbstract:This article presents a novel application-aware network architecture for evolving and emerging IT services and applications. It proposes to enrich an optical burst switching network with a Session Control layer that can close the gap between application requests and network Control. The Session Control layer is implemented using the Session initiation protocol, giving birth to what is called a SIP-OBS architecture. The article discusses the important added value of this architecture, and shows that it may support a number of end-to-end resource discovery and reservation strategies (for both network and non-network resources). Finally, it presents a testbed implementation where this approach was experimentally validated.
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TRIDENTCOM - Application Aware Optical Burst Switching Test-bed with SIP Based Session Control
2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities, 2007Co-Authors: Franco Callegati, Aldo Campi, Georgios Zervas, Reza Nejabati, W. Cerroni, Dimitra SimeonidouAbstract:In this paper we propose a novel architecture for the Control plane of an application aware optical burst switching (OBS) network, able to support grid computing applications. We suggest the use of the Session initiation protocol (SIP) to implement a protocol layer between the grid specific Control messages and the network Control plane. The proposed architecture was implemented in an existing OBS network test-bed and was successfully tested as described in the paper.
Franco Callegati - One of the best experts on this subject based on the ideXlab platform.
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SIP-empowered optical networks for future IT services and applications
IEEE Communications Magazine, 2009Co-Authors: Franco Callegati, Aldo Campi, Giorgio Corazza, Dimitra Simeonidou, Georgios Zervas, Reza NejabatiAbstract:This article presents a novel application-aware network architecture for evolving and emerging IT services and applications. It proposes to enrich an optical burst switching network with a Session Control layer that can close the gap between application requests and network Control. The Session Control layer is implemented using the Session initiation protocol, giving birth to what is called a SIP-OBS architecture. The article discusses the important added value of this architecture, and shows that it may support a number of end-to-end resource discovery and reservation strategies (for both network and non-network resources). Finally, it presents a testbed implementation where this approach was experimentally validated.
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TRIDENTCOM - Application Aware Optical Burst Switching Test-bed with SIP Based Session Control
2007 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities, 2007Co-Authors: Franco Callegati, Aldo Campi, Georgios Zervas, Reza Nejabati, W. Cerroni, Dimitra SimeonidouAbstract:In this paper we propose a novel architecture for the Control plane of an application aware optical burst switching (OBS) network, able to support grid computing applications. We suggest the use of the Session initiation protocol (SIP) to implement a protocol layer between the grid specific Control messages and the network Control plane. The proposed architecture was implemented in an existing OBS network test-bed and was successfully tested as described in the paper.
