Papers by Efstathios D Sykas
European Transactions on Telecommunications, 2010
ABSTRACT Some promising methods for the analysis of ATM systems calculate the buffer overflow ins... more ABSTRACT Some promising methods for the analysis of ATM systems calculate the buffer overflow instead of ATM cell loss probability. This is done under the presumption that buffer overflow probability is an adequate estimate for the ATM cell loss probability. These two performance parameters may differ considerably in some cases. For instance, if the mean load offered to a link slightly exceeds the link capacity, then the buffer overflow probability equals to one. On the contrary the cell loss probability may be much less than one. The paper shows how to use these methods so as to compute cell loss and examines in detail their relative performance and suitability for the description of an ATM multiplexing environment.
EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, 1994
IST Summit, 2002
Position location of mobile terminals is one of the most challenging issues nowadays. Apart from ... more Position location of mobile terminals is one of the most challenging issues nowadays. Apart from the large number of value added services that can be offered to the users, network support is one of the most useful applications for the cellular operators. The information used for positioning can be evaluated locally, so that the operator can enhance the network's performance without requiring user related information. In existing cellular systems one of the procedures that seems to cause serious network shortcomings is handover. This procedure is much more complicated in next generation systems (UMTS) and is of great interest for investigation and optimization. In this paper we have presented the structure of the LAH simulator. This simulator is a powerful platform to study cellular network procedures that are strongly related with the user location. This simulation platform will be used to prove the add-on of localization to the handover procedure.
Radio resource management is one of the most challenging issues in wireless systems of present an... more Radio resource management is one of the most challenging issues in wireless systems of present and future generation. Lack of bandwidth, increased number of subscribers and high data-rate services, often cause congestion situations in wireless systems. One of the main concerns of cellular operators is to adopt intelligent mechanisms to overcome these network shortcomings. To achieve this, an efficient traffic monitoring is required. Position location of mobile terminals is one of the means to combine measurements performed by the users and their location, resulting in a monitoring system, which consists of databases with a set of network performance indicators. This information can be exploited in a way to predict traffic overload and reconfigure the system on-the-fly. In this paper we tackle the issue of resource management and we describe an adaptive coverage system that is capable to adjust radio resources in an efficient way for the network. Our main concern is to show the poten...
Wireless Personal …, Jan 1, 2004
5th European …, Jan 1, 2004
2004 IEEE 59th Vehicular …, Jan 1, 2004
… , Services, and Protocols; …, Jan 1, 2004
N. Mitrou et al. (Eds.): NETWORKING 2004, LNCS 3042, pp. 476489, 2004. © IFIP International Fede... more N. Mitrou et al. (Eds.): NETWORKING 2004, LNCS 3042, pp. 476489, 2004. © IFIP International Federation for Information Processing 2004 ... Efficient Location-Based Hard Handoff Algorithms for Cellular Systems ... Antonis Markopoulos, Panagiotis Pissaris, Sofoklis Kyriazakos, ...
14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003., 2003
Future-generation mobile communications will provide broadband multimedia services to users, anyw... more Future-generation mobile communications will provide broadband multimedia services to users, anywhere and anytime. On the other hand network performance should be guaranteed to support these applications and services. In existing cellular systems handover is one of the procedures that causes serious network shortcomings. This procedure is much more complicated in next generation systems (UMTS) and is of great interest for
Lecture Notes in Computer Science, 2004
N. Mitrou et al. (Eds.): NETWORKING 2004, LNCS 3042, pp. 476489, 2004. © IFIP International Fede... more N. Mitrou et al. (Eds.): NETWORKING 2004, LNCS 3042, pp. 476489, 2004. © IFIP International Federation for Information Processing 2004 ... Efficient Location-Based Hard Handoff Algorithms for Cellular Systems ... Antonis Markopoulos, Panagiotis Pissaris, Sofoklis Kyriazakos, ...
The 5th International Symposium on Wireless Personal Multimedia Communications, 2002
ABSTRACT Localization of mobile terminals is one of the hottest topics, both for service provider... more ABSTRACT Localization of mobile terminals is one of the hottest topics, both for service providers and cellular operators. A large number of value added services can be offered to the users, increasing subscriber satisfaction, on the other hand network performance should be guaranteed to support these applications. In existing cellular systems handover is one of the procedures that causes serious network shortcomings. This procedure is much more complicated in next generation systems (UMTS) and is of great interest for investigation and optimization. We present a method of exploiting user's location in order to assist the handover procedure, minimizing the failure probability and the signaling overhead. Our main concern is to provide a mechanism transparent from the location server and increase network performance and stability.
Journal of Internet Technology, 2004
This paper describes how to provide global Internet access to Mobile Personal Area Networks and S... more This paper describes how to provide global Internet access to Mobile Personal Area Networks and Suggests a protocol enhancement to support mobility under different node requirements. For this purpose the concept of the user's Mobile Station acting as a Mobile ...
Lecture Notes in Computer Science, 2016
2015 IEEE International Conference on Computer and Information Technology; Ubiquitous Computing and Communications; Dependable, Autonomic and Secure Computing; Pervasive Intelligence and Computing, 2015
Proceedings. Sixth IEEE Symposium on Computers and Communications, 2001
ABSTRACT
Proceedings of the IEEE, 1991
Service (PTS) are dealt with in this paper. Mobile communications services will allow a user tu r... more Service (PTS) are dealt with in this paper. Mobile communications services will allow a user tu roam within a network. Thus there will be a need to identih several types of objects (terminals, network points oJ attachment, users, Customer Premises Networks. etc.). The mobility properties of these objects will necessitate dynamic bindings beween their addresses and naines. Moreover, the situation is further complicated since the mobility may be embedded. A mobile user may employ a mobile terminal in U mobile Customer Premises Network (CPN). Therefore, in UMTS and PTS there is a need for dynamic. binding of various identifiers with location information data. The exclusive use of Personal Telecommunication Numbers (PTN's) as Dialing Numbers (ON) is proposed in IBCN for UMTS and PTS. That is, PTN's will be used (during dialing) for making calls to mobile terminals, mobile users, as well as fixed subscribers. When the personal communication senice is not provided. the DN corresponds to the terminal number of the equipment (fixed or mobile) of the culled subscriber. Also, a proposul for the UMTS and PTS numbering plan is presented.
Ieee Communications Letters, Feb 1, 2004
ABSTRACT
IFIP WG6.2 Publications, 2003
This paper deals with the QoS management issue utilizing the active network technology. The disad... more This paper deals with the QoS management issue utilizing the active network technology. The disadvantages of the centralized network management are presented and the current solutions for distributed network management are discussed. The proposed architecture focuses on the QoS management for DiffServ architecture. The improvements that our architecture offers are presented through a service example, which involves QoS configurations.
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Papers by Efstathios D Sykas