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Modern cellular networks are expected to support both voice and a growing volume of data traffic. The rapid growth in data traffic has promoted network operators to move to Long Term Evolution (LTE), a 4th generation of wireless network infrastructure. However, LTE architecture does not support native circuit switching services and relies on the IP Multimedia Subsystem (IMS) for supporting voice and...
In view of IP multimedia subsystem (IMS) which is the focus of technical research in the field of communication, analyse the scheme of IMS network based on service provision and service triggering mechanism. According to the application triggering architecture, service triggering data and service triggering process, this paper carried out a detailed analysis, and set up IMS system basing on Linux...
The Internet Protocol Multimedia Subsystem (IMS) has been recognized as a common signaling architecture for providing next generation multimedia services. In order to enhance perceived service quality regardless of access network and device, IMS supports Quality of Service (QoS) negotiation and signaling. The IMS procedures used for that purpose are based on Session Initiation Protocol (SIP). Therefore,...
in shared-memory Chip Multiprocessor (CMP), shared data between different cores must be exchanged through the last-level-shared-cache and cache coherence must be maintained at the same time. As the number of cores increase, the cache coherence wall has become more and more serious. As for the multimedia applications full of streaming-like data, existing multicore cache coherence protocols show lower...
Multimedia applications are gaining popularity over smart devices. Sharing and using multimedia contents among multiple devices is a hot issue in N-screen environment. In this paper, we are going to investigate how the same stream can be shared by distinct bit rates devices and how several streams can be managed to different devices. We propose control architecture of group communication using Group...
On the basis of analysis of research status on IMS network security, this paper categorizes and analyzes possible abnormal events in IMS network. Combined with mature detection theories, we present corresponding strategy of detection from application layer to provide theoretical and decisive support for warning and further network process measurements to reduce the loss brought by abnormal events...
This article deals with security features of SIP and focuses on advanced authentication and key establishment methods. These methods are described and a proposal of comprehensive security for the SIP architecture is presented in this article. The solution provides strong secure authentication of SIP users and protects against various attacks occurring in the SIP architecture. Furthermore, our proposal...
The NGN (Next Generation Network), which can provide advanced multimedia services over an all-IP based network, has been the subject of considerable attention for several years. While there have been tremendous efforts to develop its architecture and protocols, especially for IMS, a key technology of the NGN, its wide deployment is still a long way off. However, efforts to create an advanced signaling...
The Serving Call Session Control Function (S-CSCF) is the main node in the IP Multimedia Subsystem (IMS) signaling plane. The S-CSCF, which acts as both a SIP server and registrar, is assigned to serve end users for the duration of their connection to the IMS network. The assignment of users to an S-CSCF is performed by the Interrogating CSCF (I-CSCF) during the user SIP agent registration. The I-CSCF...
One of the main goals of moving to Next Generation Networks (NGN) is an integrated access to multimedia services like VoIP, and IPTV. The primary signaling protocol in these multimedia services is Session Initiation Protocol (SIP). This protocol, however, is vulnerable against attacks, which may reduce the Quality of Service (QoS), an important feature in NGN services. One of the most frequent attacks...
The Third Generation Partnership Project(3GPP) forum [1] has specified IMS (Internet Protocol Multimedia Subsystem) which provides resource, admission and charging control [2] for multimedia services. The OMA (The Open Mobile Alliance) forum [3] has specified BCAST (Mobile Broadcast Services) [4] which is network agnostic service enabler for mobile broadcast service. Up to now, IMS and BCAST are separated...
With deploying heterogeneous communication devices with different kinds of access networks, it is one of the promising services to transfer an active session from one device to another. IETF SIP can provide the ubiquitous service regardless of underlying networks and device types. In this paper, we investigate two mainstream using SIP, IMS and P2PSIP, and propose interworking architecture to provide...
In IP Multimedia Subsystem(IMS) of UMTS, IMS information is delivered through the general packet radio service(GPRS) transport network, before a user equipment (UE) can access the IMS service, it must performance both packet-switch domain and IMS authentication. It is inefficient that almost all involved steps in IMS authentication are duplicated. Hence, some one-pass IMS authentications were proposed...
Universal Mobile Telecommunications System (UMTS) can support IP Multimedia services by including the IP Multimedia Subsystem (IMS) as part of its core network. To use IMS services, a user equipment needs to first authenticate itself with the UMTS and then with the IMS. However, these two authentication protocols share many similar operations. Recent research efforts have highlighted this issue and...
Network operators are in the process of adopting the IP Multimedia Subsystem (IMS) as their main underlying infrastructure which will in turn be used as a Service Delivery Platform (SDP). This process requires the migration of current services to their IMS counterparts, as well as a compatibility layer enabling successfull communication between IMS and other network infrastructures. Any and all functionality...
This paper proposes a new mechanism, multi-connection from heterogeneous networks in IP multimedia subsystem (IMS). With the appearance of IMS, multimedia service has become an important service, which needs high bandwidth and low delay. But the network, which can match these features simultaneously, doesn't exist. In order to provide robust, high-quality services in IMS, we utilize the character...
Security is a major requirement on every telecommunications system. Everyday brings new technologies, techniques and standards; in order to guarantee these telecommunication systems a complete solution to secure networks. Since IP Multimedia Subsystem (IMS) is an evolving standard that intends to support Next Generation Networks (NGN) and Next Generation Mobile Networks (NGMN), its security techniques...
With the proliferation of the high speed, broadband network technologies, the peer-to-peer (P2P) live multimedia streaming becomes more and more popular. In this paper, we proposed a SIP-based P2P multicast scheme for live multimedia streaming. By utilizing the SIP protocol, our proposed scheme not only minimizes the initial delay for playing live media streams but also reduces the infrastructure...
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...
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...
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