Showing papers on "IP Multimedia Subsystem published in 2008"

The 3G IP Multimedia Subsystem (IMS)

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IP Multimedia Subsystem (IMS)

Abstract: Over the years, Telecom networks have become heterogeneous and complex with multiple vendors, applications and technologies. Telecom companies are continuously enhancing their network infrastructure to optimize network operations. With all these challenges, operators are given a choice to move to IMS – an IP-based session and control architecture. It brings in immense advantages in terms of low OPEX, new services, an open architecture, etc. But, at the same time, its generic nature adds complexity in already complex networks. At TCS, we bring you IMS-based solutions, which will help your company achieve its business goals, while we take care of all your system integration and testing aspects, and also offer you development/ migration of services on IMS platforms.

Packet filtering/classification and/or policy control support from both visited and home networks

Abstract: A method of supporting access to a selected Internet Protocol (IP) multimedia application via an IP Multimedia Subsystem (IMS) is provided for a roaming mobile node (MN) - i.e., user equipment (UE) (10) - served by a wireless telecommunications system. The method includes: establishing a first IP tunnel (20) between the UE (10) and a local access gateway (30) of a visited network in which the UE (10) is roaming, the first tunnel (20) being anchored at the local access gateway (30); establishing a second IP tunnel (22') between the UE (10) and a home gateway (40') of a home network to which the UE (10) belongs, the second tunnel (22') being anchored at the home gateway (40'); receiving data packets at the local access gateway (30) for the UE (10); filtering the packets received at the local access gateway (30) to suitably classify corresponding traffic into one of a plurality of data flows (20a, 20b,... 20n) supported within the first tunnel (20) at varying Quality of Service (QoS) levels; receiving data packets at the home gateway (40') for the UE (10); and, filtering the packets received at the home gateway (40') to suitably classify corresponding traffic into one of a plurality of data flows (22a, 22b,... 22n) supported within the second tunnel (22') at varying QoS levels.

IP multimedia subsystems in 3GPP and 3GPP2: overview and scalability issues

Abstract: The Internet has experienced tremendous expansion in the past several years. Demands for IP multimedia services are emerging. The third-generation (3G) wireless networks aim to support mobile users with numerous Internet services. 3G standards organizations are developing IP multimedia subsystems (IMS) to achieve seamless integration between Internet and 3G networks. Moreover, the collaboration between IETF, 3GPP, and 3GPP2 is essential to the development of IMS for next-generation networks. This article first provides an overview of 3GPP and 3GPP2 IMS and illustrates the IMS requirements, architectures, and functional models. We then discuss potential scalability issues in IMS. This article provides guidance for constructing a robust and scalable IMS.

System and method for evaluating streaming multimedia quality

Abstract: A system and computer program for evaluating in real-time streaming multimedia quality. The system including a multimedia server connected to a multimedia source and a remote client in communication with the multimedia server over a network. The multimedia server is configured to receive multimedia content from the multimedia source and to transmit the multimedia content as a multimedia stream. The multimedia stream includes a plurality of audio frames and a plurality of video frames. The remote client is configured to establish a multimedia session with the multimedia server, receive the multimedia stream via the multimedia session, monitor the media quality of the multimedia stream, and passively compute a subjective quality of the multimedia stream.

IMS Application Servers: Roles, Requirements, and Implementation Technologies

Abstract: The IP multimedia subsystem (IMS) defines a generic architecture to support communication services over a Session Initiation Protocol (SIP) infrastructure. In the IMS architecture, application servers host and execute the IMS service logic. These servers can be SIP application servers, open services architecture (OSA) application servers, or a customized applications for mobile networks using enhanced logic (Camel) service environment. Some technologies used in telephony and voice-over-IP (VoIP) application servers are also applicable to IMS application servers, but such servers have some unique requirements that could limit the extent to which these technologies can meet them.

A Review of Policy-Based Resource and Admission Control Functions in Evolving Access and Next Generation Networks

Abstract: The IP Multimedia Subsystem (IMS) adopted in the core of Next Generation Networks (NGNs) promises to make network management easier by separating the control and the transport planes. Therefore, an interface between applications and the underlying transport network has been defined that offers a dynamic and efficient management of network resources based on a policy-based resource control engine. The resulting resource management framework enables the delivery of both the existing carrier grade existing and the next generation Quality of Service (QoS) sensitive services across operator-controlled networks using heterogeneous transport technologies. This review sheds some light into the policy control layer concept and the extended nomenclature introduced by current standardization works. The approaches of international standards development organizations, such as the Third Generation Partnership Project (3GPP), the International Telecommunication Union (ITU), the European Telecommunications Standards Institute (ETSI), the WiMAX Forum, and CableLabs are reviewed and compared with each other revealing the common architectural trend. Challenges and works in progress of NGN resource management towards Fixed and Mobile Convergence (FMC) are discussed as well.

IPTV session mobility

Abstract: This article describes a novel architecture for delivering personalized IPTV experiences to the end users. The framework leverages the IP Multimedia Subsystem (IMS) to quickly enable new innovative, multi-media services. We describe the session flows for a single IPTV session switch between multiple set top boxes (STBs) and between a STB and a PC/mobile device SIP user agent. We also demonstrate how supplementary services like caller ID and advanced telephony features can also be migrated across multiple devices.

System and method of providing IMS services to users on terminating non IMS devices

Abstract: Disclosed is a device in an IP Multimedia Subsystem (IMS) that provides IMS services to terminating non-IP (TNIP) devices. The method includes receiving a message to register a Public User Identity (PUID) at a TNIP device at a network-based device, the TNIP device being at an E.164 routing address, establishing, in a network device accepting communications where to send sessions destined for a PUID and providing information where to send sessions, the routing address as a final destination of sessions to the PUID based on the registration and an IP address of a network device with routing functionality based on telephone numbers as immediate destinations and using information from the registration to route to the TNIP device, after providing IMS services, using the relationship between the PUID, the routing address and the IP address of the network device with routing functionality based on telephone numbers.

Detecting flooding attacks against IP Multimedia Subsystem (IMS) networks

Abstract: The IP multimedia subsystem (IMS) is an open IP based service infrastructure that enables an easy deployment of new rich multimedia services mixing voice and data. The IMS is considered as a next generation service delivery platform (SDP) on top of different wireless and wire line access networks. It is based on the session initiation protocol (SIP) which is gaining more and more acceptance in the VoIP market. As an emerging technology, the SIP standard will certainly be the target of denial of service (DoS) attacks and consequently IMS will also inherit this problem. Therefore, it is very important to protect IMS resources from DoS threats. In this paper, we suggest an efficient solution for protecting the IMS networks from such attacks.

Partitioned IP multimedia subsystem call session control function

Abstract: A network system provides IP Multimedia Subsystem (IMS) service from a network service provider to a customer. A plurality of network elements are connected to form a core domain of the network service provider. A master IMS instance is configured within the core domain and includes a core call session control function (CSCF) and a core home subscriber server (HSS). A partitioned IMS instance is configured as a virtual core within the core domain and includes a partitioned CSCF and a customer HSS accessible by a user of the customer from outside the core domain. A virtual IMS service control interface is coupled between the master IMS instance and the partitioned IMS instance so that the partitioned CSCF has access to the core CSCF for transfer of media.

IMS-TV: An IMS-based architecture for interactive, personalized IPTV

Abstract: This article describes a novel architecture for delivering personalized IPTV experiences to end users. The framework leverages the IP Multimedia Subsystem to quickly enable new innovative, multi-media services. We describe the session flows for important use cases, such as accessing the electronic service guide, VoD, fast channel changing, and enhanced parental control services. Important parameters are quantified for the session experience in each of these use cases.

Interworking of WLAN-UMTS networks: an IMS-based platform for session mobility

Abstract: In this article a framework for interworking between a WLAN and the UMTS is presented. The uniqueness of this architecture is that the IP multimedia subsystem proposed by the 3GPP has been used as an arbitrator for network coupling and real-time session management. Apart from the advantage of a cellular network user being able to enjoy higher levels of bandwidth over a WLAN, IMS also provides a common platform for unified session control, as well as higher levels of terminal and service mobility over a heterogeneous networking environment. The article concludes by presenting the potential of this model for service continuity during and after vertical handoff with simulation results for validation.

Session initiation protocol registration with ping

Abstract: Systems and methodologies are described that facilitate improving session initiation protocol based registration of a mobile device and an IP multimedia subsystem in wireless communications. The mobile device discovers one or more SIP servers (e.g., proxy call session control functions) that are available. The mobile device issues a ping message to each discovered server in parallel to determine reachability. Based at least in part on measured round trip times associated with the ping messages, the mobile device initiates registration procedures with at least one server.

System and method of registering users at devices in an ip multimedia subsystem (ims) using a network-based device

Abstract: Disclosed are a networked-based device, method and computer-readable medium associated with an IP multimedia subsystem (IMS) for use in managing the registration of users at various devices. The method embodiment includes receiving a request for a registration action to change an IMS registration state associated with a contact location of the registration state, the request being received from a device that may be different from the contact location of the IMS registration state; and communicating data to and from the different device to implement the change in the IMS registration state.

IPTV Systems, Standards and Architectures: Part II - IPTV Services over IMS: Architecture and Standardization

Abstract: This article presents an architecture to support IPTV services in an IMS-based NGN. The architecture extends the current IMS specification with the required functionality to meet additional requirements of IPTV services. The proposed architecture can be deployed by an IPTV provider over heterogeneous access networks (mobile, wireless, and fixed) as a part of standardized NGN solutions. After presenting an overview of the IPTV standardization activities in DVB, ITU-T, ETSI, ATIS, 3GPP, and OMA, this article focuses on the ETSI TISPAN IPTV standardization. IMS-based IPTV architectural functions and possible IPTV evolutionary steps are discussed, and then the article presents an implementation example.

IP Multimedia Subsystem

Abstract: This Master’s thesis deals with IMS architecture problems. This thesis describes its creation and progress, also structure of this architecture is mentioned. Text of this thesis describes function of the most important parts of the architecture, such as Proxy-CSCF, Interrogating-CSCF, Serving-CSCF and HSS. IMS architecture uses SIP protocol for establishment, maintenance and closing session and Diameter protocol for network management functions. That is why this thesis also describes characteristics of these two protocols. Next part of the thesis is focused on Open-source platform Open IMS Core and its installation. Open IMS Core platform was developed for testing IMS technologies within an internal project at the Fraunhofer Institute FOKUS in Berlin. Nowadays it is used by major part of vendors and providers for testing their products and services. As a main theme of this thesis, there was made a simple network, which consists of three users. This network is established on fundamentals of IMS and it was made in Open IMS Core. So in one chapter is outlined a process of its creation. There is described a process of adding a user list to database server HSS. In the next part there are mentioned some information about setup of virtual IMS terminal. Eventually there are shown some possibilities of how to catch traffic in the network. In this chapter there are also state diagrams, which describe a process of registration of IMS terminal and also a process of establishment, maintenance and closing session.

Methods and apparatus for mobility support and ip multimedia subsystem (ims) registration in a multimode network environment

Abstract: Described aspects provide for improving the mobility of wireless communication devices between one network domain and another network domain, specifically, but not limited to, between a Wireless Local Area Network (WLAN) and a cellular network and the like. Present aspects provide for services to be moved seamlessly and in a reliable manner between the cellular and WLAN domains in order to minimize service disruption for the end user and provide the requisite Quality of Service (QoS) for the different applications. The aspects herein presented provide for various mechanisms that serve to improve the decision points related to when and what technology each service is expected to be associated with and provides better techniques to move the wireless communication device between cellular and WLAN domains when in-traffic and when idle.

A Presence-Based Architecture for the Integration of the Sensing Capabilities of Wireless Sensor Networks in the IP Multimedia Subsystem

Abstract: Wireless Sensor Networks (WSN) are made up of small devices that can sense context information (e.g. space, physiology, and environment). The IP Multimedia System (IMS) aims at the convergence of Internet and cellular networks. It enables the delivery of multimedia services to end-users. Integrating the sensing capabilities of WSN in the IP multimedia subsystem will open the door to a wide range of novel multimedia services. This paper proposes a presence based architecture for the integration, focusing on how the information is conveyed from the WSN to the presence infrastructure (i.e the inbound interface). Presence is an integral part of IMS. It enables the distribution of end-user presence information (e.g. location, availability), a sub-set of context information, to interested parties, generally applications. We introduce the architecture and elaborate some of the required extensions to the 3GPP presence service. The proof of concept prototype is also described.

Content protection of internet protocol (ip)-based television and video content delivered over an ip multimedia subsystem (ims)-based network

Abstract: Content delivered to client device over an Internet Protocol Multimedia Subsystem (IMS)-based network is protected through a digital rights management (DRM) scheme that leverages IMS service and access infrastructure, such as the IMS core. After authentication and selection of content to be played for the user, the network identifies a key management system having keys for decrypting the selected content. A bootstrapping service function participates in an application-level authentication of the client device to establish a secure communication channel between the key management system and the client device. The key management system responds to a content key request received from the client device by providing a content key via the secure communication channel. The network can then stream content to the client device, which decrypts it using the content key.

IP device exchange apparatus and call connection changing method

Abstract: An IP device exchange apparatus includes: a connector that is connected to a first IP phone, a second IP phone, and a third IP phone; a memory for storing a coding scheme obtained by call setting which is negotiated between the first and second IP phones; and a controller that, when receiving a call instruction for call connection to the second IP phone from the third IP phone during communication between the first and second IP phones, employs the coding scheme stored in the memory to perform, between the third IP phone and the IP device exchange apparatus, call setting between the second and third IP phones, while maintaining call connection between the first and second IP phones, thereby changing the call connection between the first and second IP phones to call connection between the second and third IP phones.

A comparative study of anomaly detection algorithms for detection of SIP flooding in IMS

Abstract: The IP multimedia subsystem (IMS) framework uses session initiation protocol (SIP) for signaling and control of sessions. In this paper, we first demonstrate that SIP flooding attacks on IMS can result in denial of service to the legitimate users. Afterwards, we report our comparative study of three well-known anomaly detection algorithms, adaptive threshold, cumulative sum, and Hellinger distance for detection of flood attacks in IMS. We evaluate the accuracy of the algorithms using a comprehensive traffic dataset that consists of varying benign and malicious traffic patterns.

SIP Multicast-Based Mobile Quality-of-Service Support over Heterogeneous IP Multimedia Subsystems

Abstract: The Universal Mobile Telecommunications System (UMTS) all-IP network supports IP multimedia services through the IP multimedia subsystem (IMS). This paper proposes a mobile quality-of-service (QoS) framework for heterogeneous IMS interworking. To reduce the handoff disruption time, this framework supports the IMS mobility based on the concept of session initiation protocol (SIP) multicast. In our approach, the mobility of a user equipment (UE) is modeled as a transition in the multicast group membership. With the concept of dynamic shifting of the multicast group's members, the flow of actual data packets can be switched to the new route as quickly as possible. To overcome mobility impact on service guarantees, UEs need to make QoS resource reservations in advance at neighboring IMS networks, where they may visit during the lifetime of the ongoing sessions. These locations become the leaves of the multicast tree in our approach. To obtain more efficient use of the scarce wireless bandwidth, our approach allows UEs to temporarily exploit the inactive bandwidths reserved by other UEs in the current IMS/access network. Analytic and simulation models are developed to investigate our resource reservation scheme. The results indicate that our scheme yields comparable performance to that of the previously proposed channel assignment schemes.

IP Multimedia Subsystem (IMS) Handbook

Abstract: The IP multimedia subsystem (IMS), established as the foundation for future wireless and wireline convergence, is the bedrock that will facilitate easy deployment on new, rich, personalized multimedia communication services that mix telecom and data services. Designers, planners, and researchers of communication systems will need to make full use of the technology occurring with this convergence if they want to be the ones providing end users with new and efficient services that are as cost-effective as they are innovative.To provide researchers and technicians with the tools they need to optimize their role in this communication revolution, the IP Multimedia Subsystem (IMS) Handbookpresents all the technical aspects of the IMS needed to support the growth of digital traffic and the implementation of underlying networks. This guide covers everything from basic concepts to research-grade material, including the future direction of the architecture. Organized in three sections, the book brings together the technical savvy of 50 pioneering experts from around the world, providing complete coverage of relevant concepts, technologies, and services. Learn How IMS Will Speed Innovation Filling the gap between existing traditional telecommunications and Internet technologies, IMS has led to an environment in which new services and concepts are introduced more quickly than ever before, such as reusable service components and real-time integration. The technology promises to be a cost-effective evolutionary path to future wireless and wireline convergences that will meet next-generation service requirements.

Triple Play: Building the converged network for IP, VoIP and IPTV

Abstract: Triple Playis a combination of Internet access, voice communication (telephony), and entertainment services such as IP television and video on demand. The erosion of the traditional voice service, together with the ever-increasing competition between companies, is pushing the telecommunications industry towards a major shift in its business models. Customers want more services in a more flexible way. Today, this shift can only be carried out by offering converged services built around the Internet Protocol (IP). Triple Play, a bundle of voice, video, and data services for residential customers, is the basis of this new strategy. Hens and Caballero explain how and why the telecommunications industry is facing this change, how to define, implement and offer these new services, and describes the technology behind the converged network. Triple Play analyses a number of business strategies to minimise costs, while migrating infrastructures and offering new services. Triple Play: Describes the elementary concepts of triple play service provision and gives detailed technical information to highlight key aspects. Discussed access networks, transport, signaling, service definition and business models. Covers the latest innovations in Triple Play services such as Ethernet in the First Mile (EFM), VDSL2 (Very High Speed DSL second generation), pseudowires andMultiprotocol Label Switching (MPLS). Explores video solutions (encoding, IPTV, VoD) alongside transmission and switching technologies (Ethernet, DSL, PON, NG-SDH). Includes a chapter on IP Multimedia Subsystem (IMS) and on fixed/mobile convergence. Triple Play: Building the Converged Network for IP, VoIP and IPTV provides decision makers, engineers, telecommunications operators, network equipment manufacturers, installers and IT managers with a thorough understanding of the changes of traditional voice service and its impact upon the telecommunications industry.

Conjoint analysis of demand for IP telephony: the case of Japan

Abstract: With the recent diffusion of broadband (BB) services, Internet protocol (IP) telephony is expected to spread significantly in Japan. This article investigates the demand for IP telephony by using conjoint analysis. Projecting IP telephony demand also contributes to Japanese info-communication policy discussions. Two points are made. First, IP telephony is still currently considered an optional supplement or an add-on service option of high-speed BB Internet access services in Japan rather than a close substitute of existing plain old telephone service (POTS). At this point, we find little evidence that many households will promptly forsake their fixed line service for IP telephony. Second, we conclude that the key condition for the proliferation of IP telephony is the complete guarantee of quality of service (QoS), including voice quality, number portability, fax usage and emergency access, comparable to or exceeding that of existing POTS.

Analysis of SIP-Based IMS Session Establishment Signaling for WiMax-3G Networks

Abstract: The IP multimedia subsystem (IMS) is standardized by the 3rd generation partnership project (3GPP) and 3GPP2 as a new core network domain to support Internet Protocol (IP) based multimedia services over 3G networks. Session initiation protocol (SIP) which is an application layer signaling protocol is also standardized by 3GPP and 3GPP2 for session establishment, management, and transformation. In this paper, we study the SIP-based signaling delay for IMS session establishment in 3rd generation (3G) network and worldwide interoperability for microwave access (WiMax) network for different channel rates. In our delay analysis, we take into account transmission, processing and queueing delays at network nodes. The delay analysis of SIP based signaling for IMS provides an insight into the efficiency of SIP signaling for IMS.

Ubiquitous Sensor Networks in IMS: an Ambient Intelligence Telco Platform

Abstract: Ubiquitous Sensor Network (USN) concept describes the integration of heterogeneous and geographically dispersed Wireless Sensor and Actuator Networks (WS&AN) into rich information infrastructures for accurate representation and access to different dynamic user’s physical contexts This relatively new concept envisions future Sensor-Based Services leading to market disruptive innovations in a broad range of application domains, mainly personal (lifestyle assistants), community (professional users) and industrial domains The support for this broad range of innovative Ambient Intelligence services urgently demands a standardized access to different WS&AN, and Telco Operators have an opportunity to lead this technological challenge as they evolve towards future Next-Generation Networks Telefonica Research and Development is a leading innovation company that provides communication services for businesses and consumers Networks and Service Platforms is a major Telefonica I+D innovation area where new Service Architectures and Platforms concepts are essential for the development of services with a high differentiation value This contribution describes Telefonica I+D activities directed to the design of an Ambient Intelligence Platform integrating USN concepts over NGN architectures In our view IP Multimedia Subsystem (IMS) concepts can enable and promote a first generation of Sensor-Based Services where multimedia interactive sessions are enriched with contextual information from WS&ANs To this end three major design criteria are addressed at three different levels At the application layer, OMA Service Environment and OGC Sensor Web Enablement are combined to define a specific USN Service Enabler At the communication, management and control level WS&AN Gateways are defined for integrating WS&ANs infrastructures into all-IP IMS environments While at the lower level, data and meta-data exchanges with different WS&ANs entities are homogeneously represented using OGC® SensorML standard Finally this paper concludes by discussing some preliminary business opportunities we foresee for the proposed Platform

A profiling engine for converged service delivery platforms

Abstract: As services become increasingly personalized, mastering knowledge of user profiles is becoming a key requirement for service providers who hold large amounts of end user service consumption data. This paper describes a profiling engine that automatically learns user profiles (user preferences, interest domains, and behaviors) by aggregating traces on converged service delivery platforms such as Internet Protocol television (IPTV), mobile video, or IP Multimedia Subsystem (IMS). Such a profiling engine enables a wide range of personalized applications including targeted advertising, personalized portals, content recommenders, and social networking applications.