Abstract
Operating system (OS) technology is significant for the proliferation of the wireless sensor network (WSN). With an outstanding OS; the constrained WSN resources (processor; memory and energy) can be utilized efficiently. Moreover; the user application development can be served soundly. In this article; a new hybrid; real-time; memory-efficient; energy-efficient; user-friendly and fault-tolerant WSN OS MIROS is designed and implemented. MIROS implements the hybrid scheduler and the dynamic memory allocator. Real-time scheduling can thus be achieved with low memory consumption. In addition; it implements a mid-layer software EMIDE (Efficient Mid-layer Software for User-Friendly Application Development Environment) to decouple the WSN application from the low-level system. The application programming process can consequently be simplified and the application reprogramming performance improved. Moreover; it combines both the software and the multi-core hardware techniques to conserve the energy resources; improve the node reliability; as well as achieve a new debugging method. To evaluate the performance of MIROS; it is compared with the other WSN OSes (TinyOS; Contiki; SOS; openWSN and mantisOS) from different OS concerns. The final evaluation results prove that MIROS is suitable to be used even on the tight resource-constrained WSN nodes. It can support the real-time WSN applications. Furthermore; it is energy efficient; user friendly and fault tolerant.
Highlights
With the recent advances in microelectronic, computing and communication technologies, wireless sensor network (WSN) nodes have become physically smaller and more inexpensive
IEEE802.15.4 stack is used, the size of the software firmware is 53,234 bytes. These results prove that the MIROS system is suitable to be used on many popular WSN platforms (BTnode, IMote, SenseNode, TelosB and T-Mote Sky, etc.) to provide the basic sensing data services
The real-time WSN applications are feasible to be executed on the low-end high memory-constraint WSN nodes, e.g., after the MIROS is applied, the memory-constrained iLive nodes can be used to run the time-critical industrial engine control tasks
Summary
With the recent advances in microelectronic, computing and communication technologies, wireless sensor network (WSN) nodes have become physically smaller and more inexpensive. WSN applications, the development of a WSN OS which is high in real-time performance yet low in memory footprint is a critical challenge. The monolithic software image, which can be larger than 100 kilobytes, needs to be updated during the reprogramming process This process is difficult to complete as the energy resource on the WSN nodes is constrained and the communication bandwidth in the WSN is limited. A new hybrid, real-time, memory-efficient, energy-efficient, user-friendly and fault-tolerant WSN OS MIROS is designed and implemented. MIROS addresses the following challenges: achieving real-time scheduling with low data memory cost; improving utilization efficiency of memory resources; managing energy resource efficiently; simplifying application programming complexity; improving application reprogramming performance; improving node reliability, and developing a new OS debugging approach.
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