A Novel Comprehensive Quality Index QoX and the Corresponding Context-aware System Framework
Hongji Xu, Min Chen, Yingming Zhou, Baozhen Du, Lingling Pan · 2018
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.