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The paper proposes a method for upper bound estimation of packet loss in VoIP networks. We analyze simple Erlang B model that is used for classic telecommunication networks dimensioning and its possible applicability to modern convergent IP networks. We propose a method to calculate proper input variables for the original Erlang B model based on characteristics of both codec and network link in use...
IP Multimedia Subsystem (IMS) is very important due to the critical role it plays in the Next Generation Network (NGN) of the Fixed and Mobile Networks. Voice traffic in IMS will be served using Internet Protocol (IP) which is called Voice over IP (VoIP). This paper uses the "E-Model", (ITU-T G.107), as an optimization tool to select network and voice parameters like coding scheme, packet...
Voice over IP (VoIP) is an emerging service and has gained popularity in recent years. The most challenging task for a service provider is to provide and monitor better voice quality. The nature of quality of service (QoS) in VoIP networks is very variable and hence it is important to be able to measure the QoS offered by the system in real time with a low computational cost. In this paper, we discuss...
Reduction in the cost of the network infrastructure will always be a relevant and commercially important topic. There is a balance between cost and Quality of Service (QoS) that has been traditionally managed in a static manner. This is no longer an ideal situation as network traffic and configuration can change in a dynamic manner. This paper examines methods by which VoIP can be managed using a...
This work examines new QoS models and dynamic network control methods for new commercial VoIP solutions. The R equation, derived by ITU for network planning that forms part of the E-Model (ITU-T G.107), has been the backbone of Quality-of-Service (QoS) prediction of telephony for decades and it has been very successful in predicting the Mean Opinion Score (MOS) and QoS for telephone systems. However,...
The R equation, derived by ITU for network planning that forms part of the E-Model (ITU-T G.107), has been the backbone of quality-of-service (QoS) prediction of telephony for decades and it has been very successful in predicting the Mean Opinion Score (MOS) and QoS for telephone systems. In this paper we question its applicability to Voice-over-IP (VoIP) systems and propose a preliminary VoIP-eM...
This paper presents means of mapping and scheduling portions of a wide-band code division multiple access (WCDMA) application on a homogeneous multi processor system-on-chip (MPSoC). We focus on the turbo decoder, which is a computationally intensive part of the application and which presents a significant processing variability. Our model allows deriving and validating a flexible scheduling method...
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