Abstract
A methodology called guarded software upgrading (GSU) is proposed to accomplish dependable onboard evolution for long-life deep-space missions. The core of the methodology is a low-cost error containment and recovery protocol that escorts an upgraded software component through onboard validation and guarded operation, mitigating the effect of residual faults in the upgraded component. The message-driven confidence-driven (MDCD) nature of the protocol eliminates the need for costly process coordination or atomic action, yet guarantees that the system will reach a consistent global state upon the completion of the rollback or roll-forward actions carried out by individual processes during error recovery. To validate the ability of the MDCD protocol to enhance system reliability when a software component undergoes onboard upgrading in a realistic, non-ideal environment, we conduct a stochastic activity network model-based analysis. The results confirm the effectiveness of the protocol as originally surmised. Moreover, a comparative study reveals that the dynamic confidence-driven approach is superior to static approaches and is the key to the attainment of cost-effectiveness.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
