Question

Briefly compare and contrast the following three QoE/QoS mapping models: black-box media-based models, glass-box parameter-based models, and gray-box parameter-based models.

Answer 1

QoE stands for Quality of Experience

QoS stands for Quality of Service.

QoE/QoS mapping is used to tie together expectations, experiences, and user perception by QoE to the application as well as the performance of the network, which is expressed by parameters used in QoS.

QoE/QoS mapping models:

It is necessary to offer error-free, quality-driven services for specific applications. A specific strategy is required in this regard to monitor quality and opt for it as necessary. The measurement of quality is not an easy task. This is why a mapping model was developed. Mapping models help in predicting considered quality from the quality of system-related service parameters.

Three important such models are:

• Black-box media-based model
• Glass-box parameter-based model
• Gray-box parameter-based model

Difference between the three models:

1. Understanding the internal structure:

Black-box media-based model offers no deep understanding of the internal structure of the system.

In Glass-box parameter-based model, the internal structure is important and the knowledge is expanded by understanding the internal context of the system.

Gray-box parameter-based model tries to leverage the advantages of both the previous models. It requires a little bit of knowledge of the internal structure.

2. Experience:

In the Black-box media-based model, the correct functioning and experience offered by it is more important than anything else.

Glass-box parameter-based model is more concerned about the integration and collaboration of the parameters.

Gray-box parameter-based model is not very much concerned about the experiences, however, its main focus is to give equal priority to both internal and external parameters.

3. Input/Output or Entrance/Exit

Black-box media-based models focus on the evaluation of entrance as well as exit media found in the system.

Glass-box parameter-based model doesn’t focus on entrance or exit aspects of the system.

Gray-box parameter-based model deals with some output characterization as well as control data to offer information about the system content.