41711298
Quantitative QoS Management Implement Mechanism in IP-DiffServ
In this paper, a quantitative QoS management implement mechanism in IP-DiffServ is presented. The approach has three merits: (1) it optimizes both the route selected for service class by traffic engineering in network layer and the service class selected for the user services by network plan in service layer, (2) it ensures quantitative QoS for the user service in DiffServ, (3) it achieves high resource utilization, and achieves better performance with less cost for the user service and selected route. Simulation has verified these merits.
13519541
WS-SLA: A Framework for Web Services Oriented Service Level Agreements
Service level agreements (SLA) becomes the prevailing business model for delivery of a large number of products and services in telecommunication and IT arenas. We presents an integrated service level agreement model applied to operating supporting system (OSS), on the basis of WfMC workflow reference model and service oriented architecture (SOA). And an application scenario instance of SLA system architecture is described by a set of operations models by Business Process Execution Language (BPEL)
1036059
Neighbor Relationship and Optimization in Mesh Overlay Multicast
Nodes in mesh overlay multicast system don't have fixed parent-children relationship like that in trees and form neighbors. But in data-driven mesh and based on pulling method, for each packet, it still follows a certain tree and the parent-children relationship does exist. While having the powerful peers stay closer to the source may improve the performance, we make the peers of high out bandwidth preempt the neighbor of the peers near the source. In our paper, we describe the delivery trees set and construct the main distribution tree, which carries most of the data, to construct the signaling path and relay priority preemption message to reduce the cost. We model the neighbor relationship to decide which neighbor to be preempted based on the capacity of the node and the contribution it makes to the probed nodes. Our simulations show that after a temporary reduction in performance at the beginning, which for the optimization chaos of optimization procedure, the system converges to a stable state and gains better performance, especially for playback delay, and meanwhile the control overhead is in reasonable range.
29911696
Web Service for Tele-Communication
In this paper, we introduce WNET/WSIP, a web service enabled converged communication infrastructure that is integrated with VoIP SIP (Session Initiation Protocol). WNET/WSIP consists of a network of WSIP node and it is based on two-way, full duplex web service interaction. WSIP is a new class of IP communication endpoints. Each WSIP node is both a SIP endpoint that communicates in the SIP world through SIP signaling, and a web service SOAP node that provides an application protocol layer alternative to SIP and a generic service integration environment for binding SIP based communication in web services. From service perspective, WNET/WSIP is an application layer protocol overlay for resilient and versatile communication services over IP. It allows dynamic service discovery and binding that integrate SIP services as a SOA component in business transactions. It separates service integration/extension environment from SIP signaling. The ubiquitous service integration nature of web service provides a disciplined solution to monitor the WNET/WSIP network. It supports dynamic service monitoring, provisioning, endpoint discovery and update, etc. In particular, we introduce the approach of using WSSecurity [12] to provide end-to-end message level security over IP in WNET/WSIP. These new capabilities are essential to the success of reliable communication services. The proposed approach was implemented in a prototype research system. Advantages of WNET/WSIP were realized and observed.
27479532
Subspace-Based Blind Detection of Space-Time Coding
Space-time coding (STC) schemes for communication systems employing multiple transmit and receive antennas have received considerable interest recently. On space-time coding, some algorithms with perfect channel state information (CSI) have been proposed. In certain fast varying situation, however, it may be difficult to estimate the channel accurately and it is natural to study the blind detection algorithm without CSI. In this paper, based on subspace, a new blind detection algorithm without CSI is proposed. Using singular value decomposition (SVD) on output signal, noise subspace and signal subspace, which keep orthogonal to each other, are obtained. By searching the intersection of the signal subspace and the limited symbol vector set, symbol detection is achieved. The simulations illustrate that the proposed algorithm significantly improves system performance by receiving more output signals relative to transmit symbols. Furthermore, the presented algorithm is robust to the fading channel that changes between two successive blocks.
26646151
Research on Radar Targets Recognition by Extracting 3-D Characteristic from ISAR Images
Based on ISAR imaging technology and Computer Vision theory, a novel target recognition method extracting the 3-Dimensional characteristic of targets from ISAR images sequence is presented in this paper, which can get higher recognition rate with fewer samples.
16024151
An adaptable architecture for secure delivery of converged services
We present an approach for secure delivery of multimodal services to end users over heterogeneous converged networks. Our approach leads to an easily adaptable and extensible system architecture, in which system components interact with each other through loosely coupled interfaces based on asynchronous exchange of messages. It also effectively separates service logic from service delivery, through the introduction of a secure broker between the end user devices and the enterprise level application that contains the service logic. This separation also provides additional levels of security at the application level. This paper describes how our approach provides the features mentioned above. We have also validated our approach through the implementation of a prototype system, a description of which is also provided.
8017889
An architecture of wireless Web and dialogue system convergence for multimodal service interaction over converged networks
This paper presents the software architecture for a new paradigm of wireless Web and dialogue system convergence and its corresponding approach to deliver multimodal multimedia enterprise communication services in the wireless environment. It uses an event-triggered service delivery method that separates service interaction and wireless web-based service delivery. A customized content presentation approach is adopted to transform the content of the service into a format suitable for presentation on the target devices. The system also contains a service delivery monitoring and backup mechanism, which is capable of sending the service content using other communication channels according to the user's preference and the channel conditions. A prototype system was implemented based on the proposed approach, which demonstrates the performance advantage of our method in the enterprise service application.