1. System Support for Cross-Layering in Heterogeneous Sensor Stack
Rajnish Kumar, Junsuk Shin, Umakishore Ramachandran
IES Micromeasurements
SensorStack with Cross-layering support
Why support cross-layering?
Information overlap across layers
Spaghetti Coding
Modules take inefficient decision
DFuse application needs routing information to decide about role migration
Linux EMM Performance:
Rule computation delay is
minimal compared to event
handling
TinyOS DMM Performance:
IES access using cache has
much less latency compared
to HSN information access.
Information Exchange Service (IES) Design Goals:
Efficient use of limited memory
Simple interface for information sharing
Extensibility
Asynchronous delivery of the information
Complex event notification
SensorStack without Cross-Layering Support
Application Lifetime Improvement
IES Architecture
DFuse performance without
Cross-layer information
DFuse performance with
Cross-layer information for
role-migration
Heterogeneous WSN Application
SensorStack
Data management module
Stackability by using standard data interface
Publish/subscribe based shared memory system
Fully-associative cache for performance
Event management module
Adaptability by notifying when to adapt
Complex event notification
Reactive memory access
DRE: Data request event
RSE: Rule satisfied event
DAE: Data available event
EMM: Event management module
DMM: Data management module
Adaptability Vs. Stackability of protocol layers
Adaptability deals with cross-layer data
A must for wireless sensor networks
Stackability deals with cross-layer functionalities
A must for modular design
Principle behind SensorStack
Decouple data from functionalities