DMCA
A dynamic operating system for sensor nodes (2005)
| Venue: | in MobiSys |
| Citations: | 186 - 13 self |
BibTeX
@INPROCEEDINGS{Han05adynamic,
author = {Chih-chieh Han and Ram Kumar and Roy Shea and Eddie Kohler and Mani Srivastava},
title = {A dynamic operating system for sensor nodes},
booktitle = {in MobiSys},
year = {2005},
pages = {163--176}
}
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Abstract
Sensor network nodes exhibit characteristics of both embedded systems and general-purpose systems. As an embedded system, a sensor node must use little energy and be robust to environmental conditions. As a general-purpose system, a node should provide common services that make it easy to write applications. TinyOS, the current state of the art in sensor network operating systems, focuses on traditional embedded system constraints; reusable components implement common services, but a node runs a single statically-linked system image, making it hard to run multiple applications or incrementally update applications. We present SOS, a new operating system for mote-class sensor nodes that implements a more dynamic point on the design spectrum. SOS consists of dynamically-loaded modules and a common kernel, which implements messaging, dynamic memory, and module loading and unloading, among other services. Modules are not processes: they are scheduled cooperatively and there is no memory protection. Nevertheless, the system protects against common module bugs using techniques such as typed entry points, watchdog timers, and primitive resource garbage collection. Individual modules can be added and removed with minimal system interruption. We describe SOS’s design and implementation, discuss tradeoffs, and compare it with TinyOS and with the Maté virtual machine for TinyOS. Our evaluation shows that despite the dynamic nature of SOS and its higher-level kernel interface, it performs comparably to TinyOS in terms of energy usage and performance, and better in terms of energy usage during software updates. 1
Keyphrases
sensor node dynamic operating system general-purpose system energy usage embedded system module loading environmental condition software update reusable component implement common service common kernel multiple application common service sensor network sensor network node traditional embedded system constraint little energy design spectrum so design dynamically-loaded module present so primitive resource garbage collection mat virtual machine discus tradeoff higher-level kernel interface mote-class sensor node single statically-linked system image update application individual module dynamic memory memory protection watchdog timer current state new operating system typed entry point dynamic nature common module bug dynamic point minimal system interruption
