Simulators for Sensor Networks

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Presentation transcript:

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) 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.

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?

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

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.

Application Processing GloMoSim Library 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 Propagation model Radio MAC Layer Network IP Transport Application Link Layer RTP Wrapper TCP, UDP, RSVP IP OSPF, AODV, … Packet Store/Forward IEEE 802.11, 802.3, … EPLRS, WaveLAN, ... Free space, TIREM

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.

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.

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.

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 Ethernet RS232 gateway V V R V V Gateway Machine R modified event scheduler Proxies for real sensor nodes Simulation Machine

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

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 transmit Idle transmit receive done Idle timeout receive transmit done Sleep timeout(3 sec) Without Power Management With Power Management

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

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)