Wireless Wave » Network

How to find a specific header in packet in NS-3

Arash — Fri, 27 Aug 2010 15:26:15 +0000

You can scan through headers like this:



PacketMetadata::ItemIterator metadataIterator = copy->BeginItem();
PacketMetadata::Item item;
while (metadataIterator.HasNext())
{
item = metadataIterator.Next();
NS_LOG_FUNCTION("item name: " << item.tid.GetName());
if(item.tid.GetName() == "ns3::Ipv4Header")
{
NS_LOG_DEBUG("Header Found");
m_isIpv4HeaderFound = true;
break;
}
}

In above code I tried to find Ipv4Header

And it is possible to access it like:

if (m_isIpv4HeaderFound) { NS_LOG_DEBUG("Header Found"); Callback constructor = item.tid.GetConstructor();

NS_ASSERT(!constructor.IsNull()); ObjectBase *instance = constructor(); NS_ASSERT(instance != 0); Ipv4Header *ipv4Header = dynamic_cast (instance); NS_ASSERT(ipv4Header != 0); ipv4Header->Deserialize(item.current); delete ipv4Header; }

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NS-3 (NS3) And Eclipse (Part I)

Arash — Wed, 03 Feb 2010 17:37:19 +0000

This is a short explanation on how I added NS-3 (version 3.6) to Eclipse (Galileo). I use first part from NS-3 Wiki

Adding Mercurial to Eclipse

First download eclipse IDE for C++ developers from http://www.eclipse.org
* Install eclipse into you operating system
* Install mercurial eclipse plugin:
- Go to help->software update
- Click on available software
- Click on add a site
- Add http://www.vectrace.com/eclipse-update/ taken from http://www.vectrace.com/mercurialeclipse/ then click on mercurialeclipse and check the box and click on install
* We suppose that you already have mercurial installed on your machine

Making a Clone of NS-3 in Eclipse

After you that you need to add the NS-3 from the repository:

Select: New -> Other, and it would be like picture below:

Eclipse mercurial after new project

Then press next. now you need to enter “Repository location URL” that is: http://code.nsnam.org/ns-3-dev

in case you want to have different versions of the NS-3 you need to define the “Clone directory name”, in the figure below I chose ns-3.7-dev

Clone the NS-3 to workspace

Now you just need to wait for the project files be cloned. then you will find a copy of the project you wanted like below:

A clone made of NS-3.7-dev in clipse

Since the folder is not know as a C++ project it is necessary to be converted to so right click on project name and select: new -> convert to a C/C++ project the rest of settings should be same as picture below:

Convert to C++ project

Configuring the Build system

We know that build system for NS-3 is Waf so we need to change the build configuration from build/make to Waf. so right click on project and select the properties then choose the “C/C++ Build”.

In the “Builder setup” choose “External Builder”

Remove the check from “Use default build command”

change “Build command” to ${workspace_loc:/ns-3.7-dev/waf}

Behaviour setting

in Behavior tab, clear both “Build on resource save (Auto save)” and “Build (Incremental build)

Behaviour setting

Now all you need to do is to push apply and Ok. you will notice that Waf starts to build the whole project.

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(Ke Liu’s) NS2 Wireless trace meaning and explanation

Arash — Mon, 07 Dec 2009 11:47:54 +0000

ACTION:	[s|r|D]: s -- sent, r -- received, D -- dropped
WHEN:	the time when the action happened
WHERE:	the node where the action happened
LAYER:	AGT -- application,
	RTR -- routing,
	LL  -- link layer (ARP is done here)
	IFQ -- outgoing packet queue
               (between link and mac layer)
	MAC -- mac,
	PHY -- physical
flags:
SEQNO:	the sequence number of the packet
TYPE:	the packet type
		cbr -- CBR data stream packet
		DSR -- DSR routing packet (control packet
                generated by routing)
		RTS -- RTS packet generated by MAC 802.11
		ARP -- link layer ARP packet
SIZE:	the size of packet at current layer, when packet goes down,
        size increases, goes up size decreases
[a b c d]:	a -- the packet duration in mac layer header
		b -- the mac address of destination
		c -- the mac address of source
		d -- the mac type of the packet body
flags:
[......]:	[
		source node ip : port_number
		destination node ip (-1 means broadcast) : port_number
		ip header ttl
		ip of next hop (0 means node 0 or broadcast)
		]

via Ke Liu’s NS2 Code and Q&A.

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IEEE 802.11 Medium Access Control

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3G and 4G Wireless Blog: OFDM and OFDMA: The Difference

Arash — Fri, 04 Dec 2009 10:41:47 +0000

A very good article about OFDM and OFDMA :

3G and 4G Wireless Blog: OFDM and OFDMA: The Difference.

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ScribeFire – a Semi Desktop blog client

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Smart posters and NFC

Arash — Tue, 03 Nov 2009 14:29:46 +0000

Years ago we could listen to part of the concert from its poster in Sci-Fi Movies, and now it is really possible. Smart posters are equipped with a tag to provide a wide range of information such as audio, video, phone number, contact information, map or simply text.

Suppose you find a smart poster advertising a new mall somewhere, you can either find the address in bottom of the map or just close your phone to read the address, a small map and a picture of the building even a contact phone. Cool! now we know all we need to get to the mall.
To surprise the seller can offer a discount coupon to those who has read the tag.

To get the idea watch the video showing the function (not by me):

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Near Field Communication, What is NFC?

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Z-Wave and Zensys

Arash — Sun, 25 Oct 2009 22:39:21 +0000

I found out that there is something called Z-Wave from Zensys, which claims is much better than ZigBee due to its operating frequencies which are at 900 and 800 bands, hence it is isolated from WiFi band (no more potential disturbance.)

According to Zensys:

Z-Wave technology dramatically extends the possibilities of today’s home security systems. Z-Wave lets cameras, sensors and other security components work in concert as a unified system, communicating with each other and with the user whether locally or remotely. A Z-Wave home alert system can also communicate with an outside monitoring agency.

–source Simulation of IEEE 802.15.4/ZigBee with Network Simulator-2 (ns-2) – ZigBee Tutorial.

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NS2 ,ZigBee and WPAN « Udin Harun

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NS2 ,ZigBee and WPAN « Udin Harun

Arash — Sun, 25 Oct 2009 22:13:28 +0000

After lots of googling I got this useful blog with lots of must-to-have links for NS2, ZigBee and most of the tools to do the simulation.

We are going to have a course project for network simulation on WPAN and ZigBee and these rare resources are very handy to start with.

NS2 for IEEE 802.15.4/ZigBee LR-WPANs :

Simulation of IEEE 802.15./ZigBee With NS-2

IEEE 802.15.4 Mac Implementation in NS-2

Low Rate Wireless Personal Area Networks (LR-WPANs) NS-2 Platform

Simulative Investigation of ZigBee/802.15.4Zigbee/IEEE 802.15.4

Module for NS2 simulator : http://www.cs.uwm.edu/~mukul/wpan.html

NS « Udin Harun

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Z-Wave and Zensys

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E-payment and m-Wallet

Arash — Fri, 23 Oct 2009 22:41:52 +0000

E-payment or e-wallet which is actually implemented as m-wallet is the biggest shot of NFC. Use of m-wallet in e-ticketing is replacing the current payment method such as mobile (SMS, web based) payment or using traditional plastic card. New generations of contactless Mastercard (paypass) or Visa (paywave) cards are available in market for customers. Currently operators are offering mobile payment with NFC-enabled mobile phones. According to reports by 2010 NFC phones are able to replace all kind of payment card or mobile based payment systems.

[NFC Congress, NFC Mobile Payments. [PDF Document] Hagenberg, Austria : TELEFÓNICA CZECH REPUBLIC a.s., 2009]

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NFC domino?

Arash — Tue, 13 Oct 2009 21:02:19 +0000

Nearness from timo on Vimeo.

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NFC Field : how it looks like in real world

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Near Field Communication, What is NFC?

Arash — Tue, 13 Oct 2009 20:55:55 +0000

Near field communication is a short range (<20cm) wireless communication system designed for mobile phones or other mobile devices supporting up to 424kbps of data rate.

It uses the same proximity technology of RFID working in 13.5MHz. Although standardization of NFC is still in progress, many applications are proposed to use it, mostly focused on e-payment, and e-wallet. Wide range of applications are being tested in the pilot projects all around the world, such as medical services, e-ticket in public transport system, e-payments, patient information card, e-wallet and public collectable information (such as posters or bus stop information). Despite the variety of applications the security and authentication problems are not easy to solve, so many researches are being done to find new solutions. In this paper we discuss NFC technology, applications and some issue regarding the implementation of the NFC enabled systems.

http://pointers.audiovideoweb.com/stcasx/il83win10145/inside_contactless_256k.wmv/play.asx

A video done by Nokia to show different applications of NFC.

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