Implementing a Processor Independent, Battery Powered Wireless

8/14/2019 Implementing a Processor Independent, Battery Powered Wireless

1/21

Implementing a processorindependent, battery poweredwireless mesh network

Submitted byRanjit Saikia

(1AC03EC035)


2/21

Abstract..

There are certain wireless technologiesworking for Embedded system applications.

But all have some drawbacks, for e.g., cost

factor, design complexity, processordependence and power consumption.

This paper describes an alternative approachthat mitigates these drawbacks.


3/21

Topics of Discussion..

Existing system.

Wireless Mesh Network for existingsystem.

An introduction to SNAP (Synapse NetworkApplication Protocol).

Implementing SNAP based design.

Advantages and Applications. Future Work and Conclusion.


4/21

Existing System..


5/21

Wireless Mesh Network for ExistingSystem..

In a conventional wireless mesh networkimplementation:

the stack is closely tied to a particular

microcontroller. Creating the wireless applications requires

extensive C/C++ programming andembedded expertise.

To increase battery life, its end deviceshave to be in sleep mode but its routershave to remain active on external power.Fig. 1..


6/21


7/21

An Introduction to SNAP..

SNAP is abbreviation for SynapseNetwork Application Protocol.

By comparison, a wireless networkbased on SNAP software stack isinstant-on, self-forming, and self-healing.

A high-level view of the SNAPsoftware stack is illustrated in fig. 2..


8/21


9/21

The SNAP Software Stack Model..

Runs efficiently on cost-effective 8-bitmicroprocessors.

Very small memory footprint of only 40 KB

compared to conventional stack, whichconsume 60 KB or more. This is designed for portability. Two key aspects to this portability are: HAL

and SNAPpy Virtual machine.


10/21

Continued..

The HAL provides a layer of abstractionbetween the main body of the softwarestack and the physical world.

The process of porting the stack to a newprocessor requires modification only to the

thin slice of the HAL.

SNAP employs industry standard 802.15.4

packet interface in addition to IEEE802.15.4 physical layer.


11/21

Continued..

The combination of SNAP and Pythonis known as SNAPpy.

User applications that run on SNAP

based nodes are created in high-levelPython scripting language.

End-user wireless applications are

compiled into processor-independentbyte-code that is run on theSNAPpy virtual machine.


12/21

SNAP based Wireless MeshNetwork..

SNAP protocol can theoretically support upto 16 million nodes in a single network!!

Being Mesh Network, no single point of

failure!! Routes between nodes do not have to be

pre-configured by the user!! When a node is powered-up it is

automatically integrated into the network,and become fully operational in a fractionof seconds!!


13/21

Ultra Low-Powered Mesh Routing..

For a constant active node, two AAbatteries can power it for only a couple ofdays.

Hence not acceptable in terms of resourcerequirements and expense. The solution is for the nodes to alternate

between being awake for a short timeand then entering a sleep mode.

Hence consume dramatically less power.fig. 3&4..


14/21


15/21


16/21

SNAP Based Proposed System..


17/21


18/21

Applications..

Mesh networks may involve eitherfixed or mobile devices.

In difficult environments such asemergency situations, tunnels and oilrigs to battlefield surveillance.

High speed mobile video applications

on board public transport or real timeracing car telemetry.


19/21

Future Work..

Study in battery technology reveals thatdischarging of a battery is nonlinear.

A mathematical model can be introduced

on battery discharging duration and lifetimefor wireless mesh networks.

An approximation algorithm called thespanning tree scheduling (STS) can greatly

improve the lifetime, data throughput andpower consumption efficiency of a wirelessmesh network.


20/21

Conclusion..

The SNAP software stack re-defineswireless networking. Networks basedon this high-performance, lowpower , small-memory-footprint stackare self-forming, instant-on, and self-healing.


21/21

.

Documents

Implementing a Processor Independent, Battery Powered Wireless