C. Tocci

Jožef Stefan Institute, Lubliano, Ljubljana, Slovenia

Are you C. Tocci?

Claim your profile

Publications (15)20.3 Total impact

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper describes the architecture of a proposed multiparty conferencing system for satellites. Different conferencing models are discussed and compared. A session initiation protocol (SIP)-based conference signaling model and an extension to protocol-independent multicast sparse mode that supports quality-of-service (QoS) in DiffServ networks are proposed, as particularly suitable for multiparty conferencing applications over satellite links. The paper also presents key issues and potential solutions of scalable QoS multicast services for multiparty conferences over satellite. End-to-end QoS parameters for voice and video are measured and analyzed on a prototype.
    IEEE Journal on Selected Areas in Communications 05/2004; · 4.14 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper describes the architecture of a proposed multiparty conferencing system for satellites. Different conferencing models are discussed and compared. A session initiation protocol (SIP)-based conference signaling model and an extension to protocol-independent multicast sparse mode that supports quality-of-service (QoS) in DiffServ networks are proposed, as particularly suitable for multiparty conferencing applications over satellite links. The paper also presents key issues and potential solutions of scalable QoS multicast services for multiparty conferences over satellite. End-to-end QoS parameters for voice and video are measured and analyzed on a prototype.
    IEEE Journal on Selected Areas in Communications 01/2004; 22:594-605. · 4.14 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: For decades, the development of the Internet was driven by the purpose of providing applications to non-mobile users. No specific Quality of Service (QoS) requirement is necessary, other than ensuring reliability in the end-to-end data transfers. As such, best effort service model was deemed more than appropriate to satisfy the users' needs. Nevertheless, the scenario has changed in the last few years. A new population of nomadic users, who requires access to Internet services regardless of their location and mode of transportation is growing, while new typologies of Internet applications are being continuously developed, in which best effort service level may no longer be adequate.The SUITED project has been devised to address the emerging issues generated by this new and challenging scenario. SUITED aims at contributing towards the design and deployment of the Global Mobile Broadband System (GMBS), a unique satellite/terrestrial infrastructure, which will ensure that nomadic users have access to Internet services with a negotiated QoS. An overview of the main results achieved in the SUITED project is provided in this article. Some of the most innovative solutions developed by the SUITED team for the joint management of global mobility and end-to-end QoS support are presented. The SUITED demonstrator platform, which was developed to validate the system specifications, is also described. Finally, the results of the experimental measurement campaigns carried out with this platform are reported. Copyright © 2004 John Wiley & Sons, Ltd.
    International Journal of Satellite Communications and Networking 12/2003; 22(1):19 - 53. · 0.54 Impact Factor
  • Francesco Delli Priscoli, Clementina Tocci
    [Show abstract] [Hide abstract]
    ABSTRACT: The European Union ACCORD project, by integrating four different Access Networks (terrestrial/satellite) with an ATM based Core Network (all developed in the framework of European Union projects), represents a possible solution for the design of a mobile broadband network providing a global coverage. In the ACCORD scenario a fundamental role is played by the Multi-Mode Terminal which allows mobile users, wherever located, to access to the same ATM based Core Network through four different Access Networks (in the following, referred to as “Segments”). This paper presents the ACCORD system architecture and describes the mobility management procedures. The main novelty behind these procedures lies in the fact that in a certain Multi-Mode Terminal more than one segment can be simultaneously active, i.e., the user can simultaneously makes use of more than one segment.
    Space communications 01/2003; 19(1):1-16.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Next generation satellite systems are ideally suited for multicast and real-time traffic. Therefore, it is highly attractive to offer IP multi-videoconference services over IP multicast enabled satellite systems, combining link efficiency and access to remote areas.
    06/2002;
  • [Show abstract] [Hide abstract]
    ABSTRACT: The emphasis of this paper is on investigating the performance of signalling protocols designed for a mobility management scheme, which uses Mobile IP for inter-segment mobility in a hybrid space and terrestrial environment. Initially, the system architecture, which consists of three wireless access networks attached to an IP backbone, is presented. This is followed by a description of the proposed mobility procedures employed in the system, which aim at minimising modifications to existing satellite and terrestrial network protocols. The mobility procedures are simulated in order to evaluate their performance and determine their effectiveness in an operational environment. Results verify the efficiency of the protocols and show that the additional signalling time introduced by the procedures is minimal.
    Computer Networks 05/2002; 39(1):21–41. · 1.28 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In the future mobile network, satellites will operate alongside cellular networks in order to provide seamless connectivity irrespective of the location of the user. Such a service scenario requires that the next generation of mobility management (MM) procedures are able to ensure terminal and user mobility on a global scale. This paper considers how the principles of Mobile-IP can be used to develop MM procedures for a heterogeneous access network, comprizing of satellite and cellular elements, connected to an IP core network.Initially, the system architecture is described. This is followed by a discussion of issues related to MM, where location, address and handover management are considered. A description of the signaling protocols for macro-mobility using Mobile-IP is then presented, emphasizing the need to minimize the change to the existing access network procedures. Finally, the performance of the protocols is analyzed in terms of the additional signaling time required for registration and handover.
    Computer Networks 03/2002; 38(4):517–530. · 1.28 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The current Internet architecture appears to not be particularly suited to addressing the emerging needs of new classes of users who wish to gain access to multimedia services made available by ISPs, regardless of their location, while in motion and with a guaranteed level of quality. One of the main objectives of so-called next-generation systems is to overcome the limitations of today's available Internet by adopting an approach based on the integration of different mobile and fixed networks. The SUITED project moves in this direction since it aims at contributing to the design and deployment of the global mobile broadband system (GMBS), a unique satellite/terrestrial infrastructure ensuring nomadic users access to Internet services with a negotiated QoS. A description of the main features of the GMBS architecture, characterized by the integration of a multisegment access network with a federated ISP network is given in this article. The GMBS multimode terminal is schematically described, and an overview of the so-called QoS-aware mobility management scheme, devised for such a heterogeneous scenario, is provided
    IEEE Communications Magazine 02/2002; · 4.46 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The next generation in mobility management will enable different mobile networks to interoperate with each other to ensure terminal and personal mobility and global portability of network services. However, in order to ensure global mobility, the deployment and integration of both satellite and terrestrial components are necessary. This article is focused on issues related to mobility management in a future mobile communications system, in a scenario where a multisegment access network is integrated into an IP core network by exploiting the principles of Mobile IP. In particular, attention is given to the requirements for location, address, and handover management. In a heterogeneous environment, the need to perform handover between access networks imposes particular constraints on the type of information available to the terminal and network. In this case, consideration will need to be given to parameters other than radio characteristics, such as achievable quality of service and user preference. This article proposes a new approach to handover management by applying the fuzzy logic concept to a heterogeneous environment. The article concludes with a presentation of mobility management signaling protocols
    IEEE Communications Magazine 01/2001; 39(12):42-51. · 4.46 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: One of the main features of next generation systems, usually referred to as "systems beyond 3G" or "4G systems", is represented by the interoperation of different fixed and mobile networks. Even if characterised by different architectural and technological solutions, it is reasonable to foresee that they will have an element of commonality with the Internet network and its protocols. This paper presents the SUITED project proposal for the deployment of a next generation system, which is capable of meeting the needs of several classes of nomadic users, such as travellers on wheels, on water or in the air. The SUITED proposal is represented by the Global Mobile Broadband System (GMBS), a unique satellite/terrestrial infrastructure obtained by integrating a multi-segment access network, whose components present mutually complementary features, with the Internet network. An overview of the main architectural features of the system is provided focusing, in particular, on the GMBS Multi-Mode Terminal (GMMT) which is described in terms of overall architecture and functional blocks. An example is given to address the role GMMT in the QoS aware mobility management scheme. I. Introduction The Internet protocol architecture was originally conceived having as main objective the creation of a robust and scalable infrastructure able to support the deployment of a number of applications. The Internet users were assumed to be in a steady state, in the office, at home etc., and accessing the network by means of wired links. Moreover, the needs of the services and applications requiring just a reliable end-to-end data transfer, were satisfactorily supported through the adoption of a best effort service model. Nevertheless, an Internet network presenting the above described features has appeared not to be suitable to face the emerging needs of a new population of Internet nomadic users, such as travellers on wheels, on water or in the air, who desire to gain access to multimedia services regardless of their location and, if possible, while in motion. Moreover, the best effort quality of the services currently available over the Internet network is nowadays becoming unsatisfactory for several user categories. The growing needs of these new classes of Internet users requiring to access multimedia applications irrespective of the location and with the desired Quality of Service (QoS), are addressed in the framework of SUITED (multi-segment System for broadband Ubiquitous access to InTErnet services and Demonstrator) project. SUITED aims at contributing to the design and deployment of the Global Mobile Broadband System (GMBS) by focusing, in particular, on its land mobile component. The SUITED GMBS system can be seen as a unique satellite/terrestrial infrastructure obtained by integrating a GMBS multi-segment access network with the federated ISP network, i.e. a portion of (eventually the whole) Internet implementing appropriate functionality. GMBS users provided with suitably designed GMBS Multi-Mode Terminals (GMMT) are able to gain access to the multimedia applications that an Internet Service Provider (ISP) is currently providing, or will be able to provide in the future, by exploiting one of the satellite/terrestrial components in the multi-segment access network. This paper intends to present an overview of the main architectural features of the SUITED/GMBS system (Section II) by focusing, in particular, on the GMMT which will be described in terms of overall architecture and functional blocks (Section III). The paper concludes with an example (Section IV) describing the role of GMMT in the execution of one of the QoS aware mobility management procedures - i.e. the location management procedure - defined for the GMBS.
    01/2001;
  • IST Mobile Communications Summit 2000, Galway, Ireland; 10/2000
  • [Show abstract] [Hide abstract]
    ABSTRACT: The need to extend the Internet services in the new environments characterized by nomadic users, such as travellers on wheels, on water or in the air, is becoming one of the major driving forces for research activity in the telecommunication area. Global mobility is more and more required by Internet users willing to access multimedia services regardless of their location. Moreover, the best effort quality of the services currently available over the Internet is now becoming unsatisfactory for several classes of users. SUITED, a project developed in the framework of the Information Societies Technology (IST) program funded by the European Union, intends to provide a solution to the growing needs of Internet users requiring to access multimedia applications irrespective of the location and with the desired QoS. It aims at contributing to the definition and deployment of the Global Mobile Broadband System (GMBS) by focusing, in particular, on its land mobile component. The SUITED approach is based on the integration of different kinds of networks-both satellite and mobile terrestrial-presenting mutually complementary features in order to create a multisegment access network for the Internet. This paper provides an overview of the SUITED/GMBS system. The main architectural features are described by highlighting how the different network components cooperate to form a global system. The approaches followed in designing the global mobility management and QoS support schemes are presented along with an example of procedure-i.e., the inter-segment handover-showing their strict interaction
    Service Portability and Virtual Customer Environments, 2000 IEEE; 02/2000
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper discusses IP end-to-end QoS support issues addressed in the IST SUITED project whose main goal is to design and validate a complemented satellite/terrestrial broadband communication infrastructure able to provide mobile and portable, QoS guaranteed, Internet services.
    01/2000;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The present paper intends to provide an overview of the solutions and techniques defined in the framework of SUITED project in order to support Internet QoS sensitive mobile services over a satellite and terrestrial complemented system also referred to as Global Mobile Broadband System (GMBS). The designed target system architecture consists of: the EuroSkyWay (ESW) Ka Band satellite system; the GPRS (General Packet Radio Service) land mobile system; the UMTS (Universal Mobile Telecommunication System) system representing the GMBS target solution aiming at complementing the GPRS system; a W-LAN system directly accessing the satellite termination nodes, i.e. the satellite Fixed Earth Stations (FESs), to prolong the satellite link in both indoor and short range outdoor environments; a terrestrial Internet network suitably upgraded with both mobility and QoS support capabilities. The final objective of the proposed GMBS system is to allows a generic user, provided with a GMBS Multi Mode Terminal (GMMT), to access Internet QoS guaranteed services while moving across any possible user environment.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: One of the main objectives of so-called next generation systems is to overcome the limitations of today's available Internet by adopting an approach based on the integration of different mobile (both satellite and terrestrial) and fixed networks. The Global Mobile Broadband System (GMBS) proposed by the SUITED project moves in this direction. The QoS-aware mobility management, key feature of the GMBS, refers to the joint handling of global mobility and end-to-end QoS support. This paper, after a general description of it, concentrates on the QoS related aspects. The provision of end-to-end QoS requires the activation of several mechanisms operating in different portions of the system. The paper focuses on both the access and the core sections. Performance results obtained by means of simulation activities for the solutions adopted in those portions are presented.