Evelina Pencheva

  • Citations Per Year
Learn More
The paper presents an approach to detection of service interaction. Service interaction manifests itself as a function of services which is neither exactly the sum of every service nor behaves as expected. In Customized Application for Mobile network Enhanced Logic (CAMEL), services may interact both in call-related and callunrelated context. Description(More)
Different multimedia applications have different characteristics and properties which determine specific quality of service (QoS). For QoS purposes the application functions may interact with the resource management function or rely on the service control functions. The optimal utilization of network resources implies cross-layer approach to resource(More)
The paper investigates an approach to exchange quality of service information across the layers between third party applications and network functions for bearer resource management. The focus is on Parlay X Web Services which may be used to access functions for policy and charging control in all IP-based multimedia networks. A functional mapping of Parlay(More)
Service interaction manifest itself as an unexpected behaviour of multiple services used together either simultaneously or in sequence. The paper describes a policy based approach to web service interaction management. Parlay X web services for call control, mobility, user interaction and policy management are studied. Web service behaviour is described as(More)
The paper is dedicated to mechanisms for open access to resource management in the Internet Protocol (IP) multimedia networks. First we present the concept of IP Multimedia Subsystem (IMS) and explain the IMS functional architecture, principles of quality of service management and service control in IMS. Then we describe the idea behind the opening of(More)
In this paper we suggest an approach to quality of service based charging in Internet Protocol Multimedia Subsystem (IMS) by the use of Parlay X Web Services. The policy and charging control (PCC) functions are analyzed and their support by Parlay X interfaces is evaluated. The open access to Application-driven Quality of Service and Payment functions is(More)
The paper presents a model of Parlay X gateway used for evaluation of its performance. The model considers traffic of different priorities generated by the service providers and the network which have to be served. It takes into account the distributed architecture of the Parlay X gateway and applies mechanisms for admission control and load balancing to(More)
In this paper we present an analysis on Policy and Charging Control (PCC) functions in all IP-based multimedia networks and identify the required functionality for quality of service (QoS) monitoring. The support of "Application-driven Quality of Service" (ADQ) Parlay X Web Service to reporting function in PCC is evaluated and improvements of ADQ interfaces(More)