摘要
In this paper,we propose a systemic architecture of network selection based on context-awareness services,which gathers contextual information that includes such network information,user information and local information.This network selection strategy considers the Quality of Service(QoS) and user preferences.Also,it perceives contexts such as speed,coverage percentage and location,etc.,and it eventually performs network selection decision making and network execution based on multiple factors.From the perspective of network decision,it presents two network selection algorithms,namely the fuzzy mathematics evaluation method and multiple attribute decision making using the TOPSIS evaluation method.System simulations suggest that network selection based on the mathematics evaluation method is much faster than the TOPSIS evaluation method.However,the TOPSIS evaluation method is practically more efficient.The network selection method based on context-awareness provides an effective and flexible network vertical handover strategy,and ensures a good accuracy and efficiency.
In this paper, we propose a systemic architecture of network selection based on con- text-awareness services, which gathers con- textual information that includes such network information, user information and local infor- mation. This network selection strategy con- siders the Quality of Service （QoS） and user preferences. Also, it perceives contexts such as speed, coverage percentage and location, etc., and it eventually performs network selection decision making and network execution based on multiple factors. From the perspective of network decision, it presents two network se- lection algorithms, namely the fuzzy mathe- matics evaluation method and multiple attrib- ute decision making using the TOPSIS evalua- tion method. System simulations suggest that network selection based on the mathematics evaluation method is much faster than the TOPSIS evaluation method. However, the TOPSIS evaluation method is practically more efficient. The network selection method based on context-awareness provides an effective and flexible network vertical handover strategy, and ensures a good accuracy and efficiency.
基金
supported by the National Basic Research Program of China(973 Program)under Grant No.2012CB315805
supported by the National Natural Science Foundation of China under Grants No.71172135,No.71231002,No.71201011,No.71271099
the Ministry of Education of the People's Republic of China under Grant No.20120005120001
