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SIMULATION OF WIRELESS PERSONAL AREA NETWORK [WPAN] IN NS2

 A personal area network (PAN) is a computer network used for data transmission among devices such as computers, telephones and personal digital assistants. PANs can be used for communication among the personal devices themselves (intrapersonal communication), or for connecting to a higher level network and the Internet (an uplink). A wireless personal area network (WPAN) is a PAN carried over wireless network technologies such as:


  • IrDA
  • Wireless USB
  • Bluetooth
  • Z-Wave
  • ZigBee
  • Body Area Network

The reach of a WPAN varies from a few centimeters to a few meters. A PAN may also be carried over wiredcomputer buses such as USB and FireWire.

Wireless Personal Area Network
A wireless personal area network (WPAN) is a personal area network — a network for interconnecting devices centered on an individual person's workspace — in which the connections are wireless. Wireless PAN is based on the standard IEEE 802.15. The two kinds of wireless technologies used for WPAN are Bluetooth and Infrared Data Association.

A WPAN could serve to interconnect all the ordinary computing and communicating devices that many people have on their desk or carry with them today; or it could serve a more specialized purpose such as allowing the surgeon and other team members to communicate during an operation.

A key concept in WPAN technology is known as "plugging in". In the ideal scenario, when any two WPAN-equipped devices come into close proximity (within several meters of each other) or within a few kilometers of a central server, they can communicate as if connected by a cable. Another important feature is the ability of each device to lock out other devices selectively, preventing needless interference or unauthorized access to information.

The technology for WPANs is in its infancy and is undergoing rapid development. Proposed operating frequencies are around 2.4 GHz in digital modes. The objective is to facilitate seamless operation among home or business devices and systems. Every device in a WPAN will be able to plug into any other device in the same WPAN, provided they are within physical range of one another. In addition, WPANs worldwide will be interconnected. Thus, for example, an archeologist on site in Greece might use a PDA to directly access databases at the University of Minnesota in Minneapolis, and to transmit findings to that database.

In NS2 we need two special commands during the simulation of WPAN [IEEE 802.15.4];

$ns at 0.0 "$node_(0) sscs startPANCoord"; # <txBeacon=1><BO=3> <SO=3>

This command is used to start PAN Coordinator and we write its syntax as like this with default values as txtBecon = 1,Becon Order =3 and Superframe Order = 3. Otherwise we can write as; 
"$node_(0) sscs startPANCoord 1 5 4"

$ns at 0.0 "$node_(1) sscs startDevice"; # <isFFD=1><assoPermit=1><txBeacon=0><BO=3><SO=3>

This command is used to start device and we write its syntax as like this with default values as txtBecon = 1,Becon Order =3 and Superframe Order = 3. 

"$node_(1) sscs startDevice 1 0"    ====> becon diabled
"$node_(1) sscs startDevice 1 1 1" ====> becon enabled


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