A Novel Comprehensive Quality Index QoX and the Corresponding Context-aware System Framework

Context-aware systems are becoming increasingly popular and are widely used in many areas such as smart healthcare, digital home, and so on. The existing context-aware system frameworks mainly focus on the improvement of organization mode of the system modules, but they normally lack a quantitative and comprehensive quality index to describe and evaluate the overall system performance. In this paper, QoX is innovatively defined as a comprehensive quality index that combines quality of device (QoD), quality of context (QoC), quality of service (QoS) and quality of experience (QoE). Meanwhile, QoX is integrated into the context-aware system and a context-aware system framework based on QoX is proposed, which provides an effective model for rational use of context and optimal system design. Besides, by studying the relation among QoX related indicators, systems can actively adjust various preset thresholds and rules according to the changes of users' needs and environmental conditions, which would make systems more reliable and adaptive and provide users with personalized and intelligent services.

[1]  Gregory D. Abowd,et al.  A Conceptual Framework and a Toolkit for Supporting the Rapid Prototyping of Context-Aware Applications , 2001, Hum. Comput. Interact..

[2]  Ming Li,et al.  Data-centric middleware for context-aware pervasive computing , 2008, Pervasive Mob. Comput..

[3]  Martin Gonzalez-Rodriguez,et al.  Semantic-based context modeling for quality of service support in IoT platforms , 2016, 2016 IEEE 17th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM).

[4]  Mario A. R. Dantas,et al.  Quality of context and grid computing: An user satisfaction and system performance trade off model , 2016, 2016 IEEE Symposium on Computers and Communication (ISCC).

[5]  Schahram Dustdar,et al.  Quality of Context: models and applications for context-aware systems in pervasive environments , 2014, The Knowledge Engineering Review.

[6]  Shuai Xu,et al.  A Weighted Belief Entropy-Based Uncertainty Measure for Multi-Sensor Data Fusion , 2017, Sensors.

[7]  Nazim Agoulmine,et al.  A Quality-Aware Approach for Resolving Context Conflicts in Context-Aware Systems , 2011, 2011 IFIP 9th International Conference on Embedded and Ubiquitous Computing.

[8]  Asma A. Q. Al-Shargabi,et al.  Quality of Context in Context-Aware Systems , 2017, EAI Endorsed Trans. Context aware Syst. Appl..

[9]  Luigi Atzori,et al.  Quality of Experience Management of Smart City services , 2018, 2018 Tenth International Conference on Quality of Multimedia Experience (QoMEX).

[10]  David Garlan,et al.  Project Aura: Toward Distraction-Free Pervasive Computing , 2002, IEEE Pervasive Comput..

[11]  Mario A. R. Dantas,et al.  Quality-aware context provider: A filtering approach to context-aware systems on ubiquitous environment , 2013, 2013 IEEE 9th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob).

[12]  Matthias Baumgarten,et al.  Measuring the Probability of Correctness of Contextual Information in Context Aware Systems , 2009, 2009 Eighth IEEE International Conference on Dependable, Autonomic and Secure Computing.

[13]  Arkady B. Zaslavsky,et al.  Context-Aware QoE Modelling, Measurement, and Prediction in Mobile Computing Systems , 2015, IEEE Transactions on Mobile Computing.

[14]  Mel Siegel,et al.  Sensor fusion using Dempster-Shafer theory II: static weighting and Kalman filter-like dynamic weighting , 2003, Proceedings of the 20th IEEE Instrumentation Technology Conference (Cat. No.03CH37412).

[15]  Markus Fiedler,et al.  Bridging between Quality of Experience and Quality of Service through TCP Flag Ratios , 2016, 2016 IEEE 41st Conference on Local Computer Networks Workshops (LCN Workshops).

[16]  Axel Küpper,et al.  Quality of Context: What It Is And Why We Need It , 2004 .

[17]  Nazim Agoulmine,et al.  A quality-aware approach for selecting context information from redundant context sources , 2011, 2011 7th Latin American Network Operations and Management Symposium.

[18]  Schahram Dustdar,et al.  Using Quality of Context to Resolve Conflicts in Context-Aware Systems , 2009, QuaCon.