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The following topics are dealt with: cluster and grid computing; P2P computing; multimedia application; knowledge management; data mining; virtual organization; cloud computing; Internet; Web computing; parallel distributed and collaborative system; multimedia display and processing; stream processing and protocol.
Defined by the 3GPP, the IP multimedia subsystem (IMS) is an architectural framework that enables the delivery of multimedia services in mobile networks. Based on the session initiation protocol, the IMS offers unified billing, QoS negotiation mechanisms, and the possibility of combining services deployed in different environments like CAMEL and Parlay OSA. With the aim of determining the real limitations...
In this paper, we introduced a design and implementation of a SIP signal control framework as a medium between the service logic and SIP stack. It is used to establish different kinds of RTP connections controlled by SIP application server according to the service logic. Through this framework, a new operation can be easily reused and a signal control flow can be easily modified or added by modifying...
The classification of unstructured P2P multicast video streaming is the premise for playing online linkage and real-time evidence in the process of network monitoring management. A new classification method is demonstrated, and some real-time protocol behavior features are figured in this paper, which is found out through distinguishing packet type and transmission direction. With these accessible...
Modern large-scale multimedia networks, such as the Internet, are characterised by heterogeneity due to the versatile nature of the communication subsystems they consist of. We focus on heterogeneous networks where individual greedy, contention-resolution protocols are simultaneously running (composed) over different network queues. A question that arises in such settings of multimedia systems concerns...
A buyer-seller watermarking protocol can enable a seller to successfully identify a traitor from a pirated copy, while preventing the seller from framing an innocent buyer. To this end, many buyer-seller watermarking protocols have been proposed. In the existing watermarking protocols, one or more of the major common problems which are customer's rights, unbinding problem, buyer's anonymity problem...
The Synchronization protocol (SYNC), which runs between the BM-SC and eNB (see [1]), was originally designed to ensure synchronized transfer of LTE Multimedia Broadcast Multicast Service (eMBMS)user data employing the multi-cell transmission mode. The BM-SC forwards the eMBMS user data, packets, after assigning the appropriate control fields defined in the SYNC protocol. The eNB buffers the eMBMS...
In the next generation mobile network, real-time multimedia applications need better network performance, such as lower handoff delay and packet loss rate. This paper proposes a new protocol named HBSIP, which is hierarchical bicasing based SIP. HBSIP is an improvement to the traditional mobile SIP, and the core idea is using the bicasting mechanism and hierarchical structure. Although HBSIP brings...
The increasing popularity of P2P and multimedia applications around the world has resulted in significant global increases in network traffic. This paper investigates the traffic changes in our enterprise network by analyzing the day-long traffic traces from 2007 to 2009. We observe that there has been a substantial increase in traffic in the past few years; however, no single application type is...
IP Multimedia Subsystem (IMS) has been widely accepted by telecom industry as the development trend for providing next generation telecom services. However, IMS application layer hasn't been well structured yet and most of the telecom services are still developed in silo method which limits new service implementation pace. In this article, we intend to present an alternative approach for service creation,...
Testing of network elements on conformance to their respective protocol specification has become a common phase during the development process. For this purpose, special programming languages, such as TTCN-3, as well as tools are available. In the context of testing complex communication architectures on conformity, further difficulties were revealed. When testing hybrid network elements with multiple...
This paper, in accordance with the authors' continuing research investigates the effect of adding extra servers in Session Initiation Protocol (SIP) signaling network on session setup delay in the IP Multimedia Subsystem (IMS). The effect of applying more than one server in reducing waiting time in each of the nodes of the system is previously investigated by the authors in and applying more servers...
Nowadays, users are reachable through a number of telecommunication devices, network operators, as well as services and applications. The calling users if provided with the appropriate information can manually select the most suitable way of communication. Although this capability already affects existing business models, the lack of a transparent and a dynamic solution renders it hard to use. To...
Internet Protocol Multimedia Subsystem, better known as IMS, is based on the specification of Session Initiation Protocol (SIP) as standardized by Internet Engineering Task Force (IETF)[1]. Service Discovery (SD) is an important part in next-generation IMS. Many efforts have been made in the research of SD.
The session initiation protocol (SIP) is an application-layer control protocol for creating, modifying, and terminating sessions with one or more participants in the IP-based telephony environment.Yang et al. and Huang et al. proposed a secure authentication scheme for session initiation protocol.Yang's scheme is based on Deffi-Hellman key agreement scheme and a combination of hash functions. In 2006,...
Session Initiation Protocol (SIP) standardized by IETF provides a way to establish the sessions between Internet telephony devices, but this protocol canpsilat work with Network Address Translator (NAT). Therefore how to make SIP NAT friendly becomes a worthy topic. This paper proposes an efficient approach P2P-Grid architecture model based ICE which uses Simple Traversal of User Datagram Protocol...
The Message Session Relay Protocol (MSRP) is defined by IETF as a session-oriented for instant message, file transfer,remote desktop sharing, whiteboard for telephone conferences and so on. Itpsilas also adopted by IP multimedia subsystem in 3G networks and becoming as important as RTP. So how to make MSRP work well through NATs have been addressed from various aspects. In this paper we propose the...
The development of assessment management system has been discussed for a long time. The motivation always focuses on the evaluation of learners' ability or on the difficulties of examination. The common examination content could be composed by text or simple figures, and the assistant functionalities could also be developed to meet the individual needs. But these functionalities couldn't interoperate...
The existing QoS mechanisms for video streaming are short of the consideration for various user environments and the characteristic of streaming applying programs. In order to overwhelm this problem, studies on the video streaming protocols exploiting scalable video coding (SVC), which provide spatial, temporal, and qualitative scalability in video coding, are progressing actively. However, these...
The paper concerns problems for service orchestration in IP-based multimedia telecommunications. For operators that want to leverage the value of legacy systems and services, Service Capability Interaction Manager (SCIM) provides means of wrapping those systems and services so that they can be orchestrated alongside new services. SCIM functionality is not specified in details and dasialivepsila SCIM...
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