Networked and Embedded Systems Laboratory

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The resource demand of complex mesh networking stacks burdens the advancement of low-cost, low-power wireless sensor nodes.	Optimizing wireless sensors means reducing costs, increasing lifetimes, and locating sensors close to the action. Adding mesh network func- tions like routing and forwarding increases RAM and ROM requirements and demands substantial idle listen- ing to forward others’ traffic, which add cost and domi- nate the power budget. We argue that an architectural sep- aration between sensor and router, similar to what ZigBee and traditional IP networks advocate, would allow each node class to be better optimized to the task, matched to technology trends, and aligned with deployment pat- terns. Although trivial to implement on current platforms, for example by turning off router advertisements in an IPv6/6LoWPAN stack, reaping the full benefits of this approach requires revising platform decisions and revis- iting the link and network layers of the stack. This work examins the pros and cons such a split offers for wireless sensor network system architectures.

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