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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,...
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...
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...
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...
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...
The IP multimedia subsystem (IMS), originally designed by 3GPP and later updated by 3GPP, 3GPP2 and TISPAN, presents itself as an architectural framework that allows the convergence of the Internet, wireless and wireline networks and a global platform for the delivery of IP multimedia applications in next generation networks (NGN). One of the most used services to test IMS capabilities is push-to-talk...
As we all know push-to-talk service implemented in the cellular network has deeply enhanced the advantages of traditional Walkie-Talkie service without the limitation of distance. In order to enrich the multimedia network communication, we have tried to deploy the PoC service into the IMS service delivery platform (SDP). Related work we have done is to simulate PoC service in IP multimedia subsystem...
The method for inter-working between UPnP home network and IMS network is proposed. All the UPnP enabled devices in the home network can access IMS network through an UPnP enabled home gateway. We present the architecture of the home gateway. The procedures of accessing IMS IPTV services for UPnP enabled devices are also given, including the device and service description of the home gateway with...
After acquiring a new Internet protocol (IP) address due to a vertical handover, IP multimedia subsystem (IMS) subscriber has to send session initiation protocol (SIP) messages for registration and session setup to keep an ongoing session. In this paper, we call this registration and session setup delay 'IMS delay.' We show that the IMS delay is unacceptable for supporting real-time applications in...
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