A Dynamic Backup-based Service Contingency Mechanism in Ubiquitous Stub Environments

Because devices limited ability and networks dynamic topology can not ensure persistent high-quality heterogeneous services in Mobile Ad hoc NETwork (MANET), a Dynamic Backup-based Service Contingency Mechanism (DBSCM) is proposed, which includes three stages: service request, select and maintenance. Firstly, the individual and cooperative capability is fully taken into consideration to model the backup index function. Secondly, Time-Prediction based Algorithm (TPA) is proposed to construct robust devices set in service selection. Then Global Backup Algorithm (GBA) is proposed to improve execution persistence in service maintenance. Finally, the simulation results demonstrate that the mechanism lowers 30%~45% and 14%~28% about interrupt numbers, improves 10%~40% and 0%~25% about utility and lowers restart-time than Dynamic Monitor Based Service Recovery Strategy (DMBSRS) and Cold Backup Service Replacement Strategy (CBSRS).