Showing papers on "IP Multimedia Subsystem published in 1999"

IP services over Bluetooth: leading the way to a new mobility

Abstract: We present protocol concepts for an extension of IP for mobility issues in Bluetooth networks. The protocol is called BLUEPAC IP, where BLUEPAC stands for "BLUEtooth Public ACcess". "Public access" means access to various kinds of information in public areas, e.g. airplane, train, hotel room, department store, museum. Bluetooth will reside in low-cost chips that provide wireless communication up to OSI Layer 2. By the end of this year many mobile devices, e.g. notebooks, PDAs, cell phones, will contain Bluetooth chips as a cable replacement. But Bluetooth is move powerful: with a suitable network protocol that inherits all aspects of IP, it will be possible to provide IP services over Bluetooth. BLUEPAC IP takes IP as a basis and additionally includes functionalities of mobile IP and cellular IP for local IP address assignment, routing issues and handoff support.

Method of completing long distance pots calls with ip telephony endpoints

Abstract: When a calling party calls a called party on the public-switched telephone network (PSTN), a database common to both the PSTN and an Internet Protocol (IP) network, is accessed to determine whether the called telephone line is currently active on the IP network. That database maintains a record for each user who is currently active on the IP network through an Internet Service Provider (ISP). In addition, each record contains information identifying the particular user logged into the network on that line, an indication whether the telephone line is IP telephony capable, an indication whether that line is currently active on an IP telephony call on an Internet Telephony network (ITN), and the IP telephony feature set subscribed to by the called party on that line. If the telephone line is active, IP telephony capable, currently active on an IP telephony call on the ITN, and the called party subscribes to a call waiting-on-IP feature, then the incoming call can be forwarded as an IP telephony call to the called telephone line over the ITN. Alternatively, the incoming call can be directed to an alternate destination on either the ITN network or the PSTN, such as a voice mail or message service. If the called party is engaged in a browsing activity and has an IP telephony capability, then the called party is alerted to the incoming telephone call via a message on his terminal. The incoming call is then completed through the ITN to the called party as an Internet telephony call. If the called party is currently active on the IP network through an ISP, but does not have an IP telephony capability, then the PSTN forwards a message to the ISP, which pushes a message to the called party to inform him or her of the incoming call. The incoming call is then be directed onto the IP network to a messaging service, or on the PSTN to a voicemail service, or to an alternate telephone number, such as a cellular phone, for pickup by the called party.

Private ip telephony backbone linking widely-distributed enterprise sites

Abstract: A hybrid IP backbone network (27) spans geographic locations of two or more publicly-switched telephone networks (15, 17, 19) and includes nodes (21, 23, 25) with translation servers adapted to translate between data protocols compatible with the PSTNs and a data protocol compatible with the IP bakcbone network Calls placed in one PSTN then may be routed to an IP node, translated to data-packet protocol, through the IP backbone to a second node having another translation server, and therethrough into another PSTN and thence to a final destination In some embodiments data gateways (69) and trunk gateways (71) are also provided at and integrated with IP nodes in the IP backbone network

Merged packet service and mobile internet protocol

Abstract: A network, system and method for merging a packet service such as GPRS with a mobile IP is disclosed. The GPRS network includes a first base station for providing wireless access to a mobile node, a GPRS support node (GSN) connected to the base station, and a security gateway for connecting the GPRS network to a second network that may use mobile IP. The GSN is capable of creating an IP tunnel connecting it to the second network through the security gateway. The GSN is also capable of handling mobile IP specific messaging and converting the wireless access to mobile IP specific messaging.

Multimedia messaging service for GPRS and UMTS

Abstract: Mobile telecommunications networks will evolve to a great extent in the future. They will offer higher data rates and provide new services for nomadic users. The development of packet switched data bearers for 3/sup rd/ generation wireless networks will enable support for multimedia applications as well. Multimedia can be divided into real-time and non-real-time services. In this paper we concentrate on a new non-real-time multimedia service called multimedia messaging service (MMS). Multimedia messaging service allows mobile subscribers to exchange arbitrary types of information in a store-and-forward manner. Multimedia messages may consist of text, images, audio or video clips, or any combination of these. A new network element called multimedia messaging service center is needed for storing and forwarding the messages. We describe in more detail what we mean by multimedia messaging service. We also analyze the different architectural options for supporting multimedia messaging within UMTS (Universal Mobile Telecommunications System) and GPRS (General Packet Radio Service for GSM) networks.

Intellectual property library management system

Abstract: An IP library management system includes IP data segregated into two separate databases: an IP database for storing virtual component data, and an IP catalog database for storing attributes pertaining to the stored virtual component data. The IP database and IP catalog database are connected over a local area network. An IP database file server acts as the intermediary between the IP database and the local area network, while one or more database servers act as the intermediary between the IP catalog database and the local area network. The local area network may be connected to a wide area network allowing remote access by a number of remote users. The IP library management system provides an IP authoring methodology and an IP integration methodology associated with the two databases. Users may access the IP library management system through a global computer network such as the Internet.

IP telephony gateway

Abstract: The present invention provides an IP telephony gateway. According to a first aspect of the invention, the gateway provides communications between a switched circuit network (SCN) and an IP network. The gateway can handle calls between clients on the switched circuit network and IP clients on the IP network. The gateway provides supplementary call services/features for calls to/from IP clients on the IP network, thus providing IP clients with similar features to those that are available to terminals on a PBX. The gateway is preferably a PBX which supports the supplementary services/features. Advantageously, the gateway can also provide supplementary call services/features to calls between IP clients on the IP network. This can be achieved by routing call control signaling for IP client - IP client calls via the gateway where the services can be controlled. A further aspect of the invention provides an IP network in which IP clients have access to a range of supplementary call features/services. At least one of the supplementary features/services is provided by a gateway, such as a PBX, at an interface to the IP network. A call from an lP client is routed via the gateway to apply the supplementary feature/service.

Quality of service for voice over IP

Abstract: The paper presents the issues and technologies for delivering voice services over packet switched networks such as IP networks. Specifically the article covers IEEE 802 based LANs (e.g. Ethernet) and IP based networks. The paper starts by looking at quality of service (QoS) from a user perspective. The network factors which affect the QoS are then considered. Layer 2 or LAN issues are then discussed, followed by Layer 3 (IP) networks. Finally a technology roadmap and some conclusions are presented. (4 pages)

Mobile IP and security issue: an overview

Abstract: Mobile IP enables a wireless network node to move freely from one point of connection to the Internet to another point, without causing disruption of established TCP end-to-end connectivity. Our model for extending Mobile IP relies on the existence of servers that are capable of performing accounting, authentication, and authorization (AAA) services. The model is known to be reasonable, because many dial-up services in the Internet today already rely on an AAA service called RADIUS. We capitalize on the experience of others in today's Internet to combine Mobile IP with AAA services to provide the kind of mobility infrastructure that meets the emerging needs of cellular telephones for mobile data, and eventually Voice over IP, services to a large population of mobile telephone users. Mobile IP will increase the deployment of wireless data applications. Using the AAA extensions will create a much easier path towards ubiquitous availability of wireless service across the domain boundaries of the operators for many different wireless access services.

On the Analysis of Cellular IP Access Networks

Abstract: Mobile IP represents a simple and scalable global mobility solution but lacks support for fast handoff control and real-time location tracking found in cellular networks today. In contrast, third generation cellular systems offer seamless mobility support but are built on complex and costly connection-oriented networking infrastructure that lacks the inherent flexibility, robustness and scalability found in IP networks. Future wireless networks should be capable of combining the strengths of both approaches without inheriting their weaknesses. In this paper we present analysis of Cellular IP, a new host mobility protocol which represents one such approach. Cellular IP incorporates a number of important cellular system features but remains firmly based on IP design principles. The protocol presented in this paper is implemented as extensions to the ns simulator.

GPRS and IS-136 integration for flexible network and services evolution

Abstract: The integration of General Packet Radio Service with IS-136 networks will provide IS-136 users and operators with many benefits. In addition to the existing voice services on circuit networks, the mobile user with an appropriate terminal now has direct access to services on packet data networks through GPRS. Of particular importance are services based on the Internet Protocol (IP). Furthermore, compared with fixed IP networks, there is an added dimension stemming from user mobility, which results in mobility-specific requirements and mobility-specific services. In addition, GPRS protocols open up the possibility of global data roaming with Global System for Mobile Communications networks. From the operator perspective, the integration enables a controlled and flexible architecture transition to a network where data applications play an increasingly important role. The operator also benefits from the GSM economies of scale and from the evolution roadmap of GSM to the third generation. Finally, the above service advantages to the user translate into a competitive advantage for the operator. This article describes the architecture resulting from integrating IS-136 with GPRS and discusses the service evolution as well as network evolution that can be envisioned from such integration.

Content model for mobile adaptation of multimedia information

Abstract: The penetration of Internet services has introduced a set of transmission and presentation standards. At the same time, the limited bandwidth resources of cellular networks and terminals set strict requirements on the transmission and presentation of multimedia. This paper proposes a new, abstract model to represent and adapt multimedia to hybrid environments. The model includes a layered mapping of semantic and physical entities and is combined under the taxonomy of multimedia adaptation to optimize end-to-end service. We conclude with an example case that utilizes the proposed techniques.

A voice over IP service architecture for integrated communications

Abstract: The rapid evolution of Internet telephony has introduced new service implementation paradigms. The authors propose a service architecture that integrates circuit based telecommunications with the Internet through the control elements of traditional and emerging networks, specifically the gatekeepers of VoIP and the SCPs of PSTN.

Mobile IP and wide area wireless data

Abstract: In this paper we present techniques for allowing Mobile IP to interwork with wide area cellular networks. As an example, we illustrate a network consisting of a GSM general packet radio service (GPRS) air interface and a Mobile IP backbone network. The advantage of such a solution is that the backbone network may easily be used to support integrated wireless and wired data transfer, and the leveraging of standard data networking protocols and equipment will reduce the cost of wireless data networks. We present issues and suggested solutions for mobility management functions, such as detecting changes in points of attachment to a network, micromobility, roaming, and paging, and security functions, such as authentication and ciphering. We show which elements of each network, GSM and Mobile IP, may be re-used, combined, or eliminated to provide a single, unified network.

A Java framework for Web-based multimedia and collaborative applications

Abstract: MultiTel is a compositional framework for developing collaborative multimedia applications, and also designates a Web-based distributed platform that supports intercomponent communication. This article shows how compositional and coordination paradigms can be successfully applied to design cooperative Java applications with multimedia data exchange. The focus is on multimedia and network architectures, which define generic and specific components coordinated by connectors for resolving the resource management needs of collaborative applications. The MultiTel platform composes application components dynamically, providing mechanisms for building services with plug-and-play transport and multimedia resources.

System and method of operation for verifying and validating public switch telephone networks (PSTN) to (IP) network services

Abstract: A system verifies and validates PSTN to IP Network services prior to the availability of the services to a plurality of subscribers. A PSTN call generator services a plurality of callers coupled to the PSTN and to a test database. An IP client simulator is coupled to the test database and to an IP Network. A data bus couples the PSTN and the IP Network to a registration server for registering the client and a heartbeat server for tracking the system for heartbeat message. An application server processes test service calls from the PSTN call generator whereby PSTN-IP Network services can be executed for all clients or individual clients as represented by the IP Client simulator for verification and validation of PSTN services to IP Network clients prior to the availability of the services to the clients.

Call setup for IP/Internet telephony

Abstract: A method for setting up a voice call over an IP network is described. The method first initiates an IP voice call to a called device connected to a telephone line. The method then determines whether the called device is already connected to the IP network. If the called device is not already connected to the IP network based on the determining step, the method will initiate a telephone call with an associated telephone signal through the telephone line to the called device, to alert the called device that an IP voice call is pending.

Wireless and IP integrated system architectures for broadband mobile multimedia services

Abstract: This paper discusses wireless and IP integrated system architectures for broadband mobile multimedia services. Possible wireless IP network architectures are given and discussed, taking mobility support into account. This paper also proposes a new ATM-based wireless IP network architecture with handover capability for broadband mobile multimedia services.

Seamless IP-based service integration across fixed/mobile and corporate/public networks

Abstract: Cellular mobile and Internet technology are today's driving forces in telecommunications In future, as both data as well as voice communications rely increasingly on IP-based techniques and applications, IP is expected to provide the means for the integration of services across different access networks ranging from fixed/wireless LANs to fixed/mobile public networks (ie PSTN, GSM/GPRS, in future UMTS) In particular, seamless roaming seems to be an important requirement of mobile users, such as consultants or sales people accessing data bases or experts "at home" while they are "on the move" We describe and assess architectures to support seamless IP-based service integration in both corporate and public network environments We report on practical experience gained within testbeds and show the impact on the architecture of IP-based mobile networks

IP repository, a Web based IP reuse infrastructure

Abstract: To hit the ever shorter market window for System on Chip (SoC) designs it is essential to reuse existing design components, also often described as Intellectual Property (IP). Easy search, select and efficient integration of available IP in a global, multi-site development environment is a key enabler for fast SoC development. In this paper, we present a Web enabled IP Reuse Infrastructure for IP consumers and providers, delivering search, select, upload and download capabilities. A central place for one stop IP shopping-the IP Repository.

Monitoring selected IP voice calls through activity of a watchdog program at an IP-addressing mapping check point

Abstract: Surveillance of IP voice calls over a public communication IP link is achieved by a WatchDog program, associated with an IP Address Mapping Check Point translating IP phone numbers into IP addresses, that are connected to a head end hub connected in turn to a Hybrid Fiber Coax (HFC) link of IP phone users or to a backbone network carrying IP voice packets.

Voice over Internet protocol and human-assisted e-commerce

Abstract: By fostering the finalization of open standards and the convergence of voice, video, and data, the Internet protocol provides an ideal driver for the definition of the infrastructure for new multimedia and advanced communications applications. Voice over IP represents not only the chance to achieve cost-effective real-time voice communication over IP-based networks, but also the opportunity to build an integrated and open communications service delivery infrastructure. Developments of Web-based information systems and IP telephony in order to enable future e-commerce applications are summarized.

Proposal of a method of voice stream multiplexing for IP telephony systems

Abstract: IP telephony systems are expected to be deployed worldwide in the near future because of their potential for integrating the multimedia communication infrastructure over IP networks. Phone-to-phone connection over an IP network via IP telephony gateways (IP-GWs) is a key feature of the system. In an IP telephony system, a low-bit-rate voice codec is used to improve bandwidth efficiency. However, due to the packet transfer method over the IP network, it is necessary to add packet headers, including IP, UDP, and RTP headers, which increases the header overhead and thus decreases transfer efficiency. Moreover, because there will be large numbers of short voice packets flowing into the IP network, the load on the Internet will increase. We propose voice stream multiplexing between IP-GWs to solve these problems. In this scheme, multiple voice streams are connected between a pair of IPCWs, enabling multiplexed voice stream transfer. The voice stream multiplexing mechanism can reduce the header overhead as well as decrease the number of voice packets. The voice stream multiplexing we propose is to concatenate RTP packets destined for the same IP-GW at a multiplexing interval period into a single UDP packet. The advantage of this method is that no new additional header is required and the current well-defined H.323 and RTP standards can be applied with minimum changes. We implemented and tested the system.

Location-dependent multimedia computing

Abstract: The ultimate goal of mobile multimedia systems is to assist users all the time and everywhere by providing the right information at the right place in the right manner. With such assistance, users will not have to waste effort in interacting and interfacing with the mobile device, but will be able to dedicate their attention to the actual environment. To provide this assistance, these systems require information about the user's context. One of the most important pieces of context information is the user's location. An efficient location dependent computing system should provide ubiquitous coverage and should be combined with a network infrastructure that provides access anywhere and at any time. The author discusses the application areas where location-dependent multimedia is useful. He looks at the infrastructure necessary of location-specific multimedia applications, including location sensors and location service requirements.

Multimedia Satellite Networks and TCP/IP Traffic Transport.

Abstract: To meet an increasing demand for multimedia services and electronic connectivity across the world, satellite networks will play an indispensable role in the deployment of global networks. A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constellations operating in the Ka-band and above. At these frequencies, satellite networks are able to provide broadband services requiring wider bandwidth than the current services at C or Ku-band. Most of the next-generation broadband satellite systems will use ATM or ’ATM-like‘ switching with onboard processing to provide full two-way services to and from earth stations. The new services gaining momentum include mobile services, private intranets, and high-data-rate internet access carried over integrated satellite-flber networks. Several performance issues need to be addressed before a transport layer protocol like TCP can satisfactorily work over satellite ATM for large delay-bandwidth networks. The authors review the proposed satellite systems and discuss challenges such as traAEc management and QoS requirements for broadband satellite ATM networks. The performance results of TCP enhancements for Unspecifled Bit Rate over ATM (ATM-UBR+) for large bandwidth-delay environments with various end system policies and drop policies for several bufier sizes are presented.

Evolving technologies for new Internet applications

Abstract: What will drive the Internet as new multimedia applications demand an infrastructure that enables greater network capacity and support for multicast and quality of service than the traditional TCP/IP and router-based structure? This article surveys seven key technologies that show promise.

Concurrent ip based voice and data services via wireless networks

Abstract: A problem in the mobile communications field is that enhanced voice services such as envisaged by the WAP Forum for mobile users of wireless networks would require use of two bearer services to deliver said services. This is inefficient and potentially more costly to the user and network operator. The problem is solved by use of a voice over IP technology and with digitising and packetizing of voice data and control data and transmission of the discrete packets over a single circuit-switched connection using IP based data communication to provide both the IP Voice connection and associated control for enhanced voice services.