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Simulators for Sensor Networks

Simulators for Sensor Networks. Sagnik Bhattacharya 9/12/2001. Overview. What we need? How much effort should we put? Simulators : JavaSim GlomoSim NS - 2 SensorSim Comparison. What we want?. It should perform simulations of our algorithms. (obviously)

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Simulators for Sensor Networks

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  1. Simulators for Sensor Networks Sagnik Bhattacharya 9/12/2001

  2. Overview • What we need? • How much effort should we put? • Simulators : • JavaSim • GlomoSim • NS - 2 • SensorSim • Comparison

  3. What we want? • It should perform simulations of our algorithms. (obviously) • It should have models for wireless transmissions and battery models. • It should be extremely scalable. • It should be efficient for large simulations. • There should be technical support.

  4. How much effort should we put in? • Build battery and wireless models? (Preferably no) • Implement routing? • How much learning is involved? • Change basic modules or just add our own modules?

  5. JavaSim • Pros • Very modular • Easy to use • Cons • Geared for wired internetworks • No wireless support

  6. GlomoSim • Specific for mobile wireless networks. • Built as a set of libraries. The libraries are built in Parsec( a C-based discrete event simulation language). • Layered architecture with easy plug-in capability.

  7. GloMoSim Library Application Transport IP Network Link Layer MAC Layer Radio Propagation model Data Plane Modular, extensible library for network models Model each layer using abstract or detailed model Built-in statistics collection at each layer Application Processing RTP Wrapper TCP, UDP, RSVP IP OSPF, AODV, … Packet Store/Forward IEEE 802.11, 802.3, … EPLRS, WaveLAN, ... Free space, TIREM

  8. NS - 2 • De facto standard for network simulations • Does support wireless simulations • A primitive energy model is present. • Lots of documentation. • Uses Tcl to specify the Components, and Otcl to glue them together.

  9. NS - 2 (contd.) • Cons : • Difficult to use and learn • Supposedly more useful for getting statistics for lower level protocols. • Originally built for wired networks, later extended for wireless. • Supposedly, does not work well for large topologies.

  10. SensorSim • Extension to NS - 2. • Provides battery models, radio propagation models and sensor channel models. • Provides a lightweight protocol stack. • Has support for hybrid simulation. • To be integrated with NS - 2.

  11. SensorSim Architecture app monitor and control hybrid network (local or remote) real sensor apps on virtual sensor nodes app GUI app socket comm serial comm ns GUI Interface HS Interface RS232 Ethernet gateway V R V V Gateway Machine V R modified event scheduler Proxies for real sensor nodes Simulation Machine

  12. Sensor Node Model in SensorSim Battery Model Node Function Model Micro Sensor Node Applications Power Model (Energy Consumers and Providers) Middleware State Change Network Protocol Stack Radio Model Sensor Protocol Stack Network Layer Sensor Layer CPU Model Status Check MAC Layer Physical Layer Sensor #1 Model Physical Layer Sensor #2 Model Wireless Channel Sensor Channel

  13. Power Management Model BZR event Off BZR event BZR event BZR event Off BZR event Transmit transmit Receive Transmit BZR event Receive transmit done receive done Idle transmit transmit receive done Idle timeout receive transmit done timeout(3 sec) Sleep With Power Management Without Power Management

  14. SensorSim Problems • Still at pre-release stage. • No Documentation.

  15. Comparison • On paper : SensorSim looks really good. Their DNS group has already done a lot of work. • Effort : GlomoSim seems better. • Track Record : NS wins. (GlomoSim was built by UCLA, but still they built SensorSim)

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