Today's Internet provides only a single Class of Service (CoS) to all of its services (e.g., Multimedia, Data, Audio), namely the best-effort service. This service does not make any guarantees on the Quality of Service (QoS) an application receives. The continuous demands for QoS guarantees have led to the introduction of various network-layer mechanisms that provide some end-to-end QoS assurance including MPLS, Integrated Service Model (IntServ), and Differentiated Service Model (DiffServ). However, the QoS mapping between the network-layer and the application-layer is still a challenge and needs to be addressed. To guarantee and end-to-end QoS, it is essential to map QoS parameters between these layers. A framework for investigating the mapping of the packet loss rate as an important QoS parameter is presented here. The network QoS performance characteristic for the loss parameter is mapped from lower to upper layer in a quantifiable way.
The majority of today's infrastructures are vulnerable to various disruptions that affect their essential services. Consequently, different research programs have been aiming at lowering such disruptions. In fact, the problem of designing systems with dependability, reliability, or security characteristics has long been acknowledged as an area for further research, and has received a substantial amount of attentions in the last few years by many different organizations and institutes. However, there are various inconsistent concepts and terminologies that are commonly used to describe the performance of systems (e.g., high-confidence, survivable, trustworthy, and robust). Some of these concepts are quantitative while others are qualitative, and it is a challenge to analyze and evaluate the performance of systems subjectively. Therefore, in this research, we are relating the various subjective concepts to a simple measurable concept which is the reliability concept, and based on analyzing this concept in the high-speed IP-based network environment, the reliability concept is further expressed by the Quality of Service (QoS). A QoS mapping between the lower and upper layers loss rate performance parameter has been developed. Further, the impact of the lower layer packets loss on the upper layer frames quality has been investigated. This mapping allows better understanding of the technical network parameters from the application's perspective of the service level agreement (SLA) and it balances the reservations of the right resources.
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