Framework
To address the objectives a framework with three layers has been developed to separate measurements, their management and their visualization.
Measurement Points from the lowest layer in the system (Measurement Point Layer) and are responsible for measuring network metrics. The measurements can be carried out using active or passive monitoring techniques, i.e. by the use of additional test packets or the monitoring of existing packets. Each Measurement Point deals with a specific metric (e.g., one-way delay, one-way-delay variation, packet loss, utilization, available bandwidth).
The Service Layer is the middle layer of the framework and consists of administrative domains. It allows for the exchange of measurement data and management information between domains. In each domain, a set of services is responsible for the domain control. Each of them is in charge of a specific functionality, like authentication and authorization, discovery of the other services providing specific functionalities, resource management, or measurement of network traffic parameters. The interaction of the services inside a domain as well as the access to the Measurement Point Layer or other domains may not be visible to the end user. Some of the services contain an interface which can be accessed by the User Interface Layer.
The User Interface Layer consists of visualization tools (user interfaces) which present of measured data according to the needs of specific user groups. In addition, they may allow users to perform tests using the lower layers of the framework.
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