Can implement MAC protocol using NS2?

MAC Protocols in NS2 referred as Media Access Control.It is data communication network protocol sub layer. Mac is also known as medium access control protocol.It is also specified in the seven-layer OSI System. Wireless data medium is shared between many adjacent nodes. Transmission from adjacent node receives data.

What protocol does NS2 support?

NS2 is a simulation package that supports several network protocols including TCP, UDP, HTTP, and DHCP and these can be modeled using this package [21].

What is S-MAC protocol components?

– Sensor-MAC: As a slotted energy-efficient MAC proto- col, S-MAC [8] is a low-power RTS-CTS protocol for WSNs inspired by 802.11. S-MAC includes four major components: periodic listening and sleeping, collision avoidance, overhearing avoidance, and message passing.

What is design approach’s-MAC protocol?

The proposed MAC protocol enables bidirectional communication, controls active and sleep modes of a sensor node to conserve energy, and addresses the problem of load unbalancing between the nodes near a sink and the other nodes. It can improve reliability of communication significantly while extending network lifetime.

How do I add a protocol in ns2?

1. Create new header structure.
2. Enable tracing support of new header.
3. Create static class for OTcl linkage (packet.h)
4. Enable new header in Otcl (tcl/lib/ns-packet.tcl)

How is NS2 implemented?

Ans: You need to perform the following steps: Put the NS executable path into PATH environment. Put the otcl path into LD_LIBRARY_PATH environment. Put the tcl library path into TCL_LIBRARY environment.

What are the drawbacks in S-MAC protocols?

Disadvantages: TMAC’s major disadvantage is early sleeping problem in which nodes may sleep as per their activation time and data may get lost especially for long messages. Although there are various MAC layer protocols proposed for sensor networks, however, there is not one protocol which is accepted as a standard.

What is the purpose of MAC protocol?

Media access control (MAC) protocols enforce a methodology to allow multiple devices access to a shared media network. Before LANs, communication between computing devices had been point-to-point. That is, two devices were connected by a dedicated channel.

Why are two languages used in NS2?

NS2 consists mainly of two languages: C++ and OTcl. Each of these two languages has its own strengths and weaknesses. NS2 beautifully integrates these two languages to draw out their strengths. For most of the time, you would not need to know the integration mechanism.

What is UDP in NS2?

A “UDP” agent that is attached to n0 is connected to a “null” agent attached to n3. A “null” agent frees the packets received. An “FTP” and a “CBR” traffic generator are respectively attached to “TCP” and “UDP” agents, and the “CBR” is configured to generate 1 Kbytes packets at the rate of 100 packets per second.

What is the main function of MAC protocol?

The MAC layer main functions are frame delimiting and recognition, addressing, transfer of data from upper layers, error protection (generally using frame check sequences), and arbitration of access to one channel shared by all nodes [4].

What are the requirements of a MAC protocol?

Scalability, Adaptability and Decentralization are three important criteria in designing a MAC protocol. The sensor network should adapt to the changes in the network size, node density and topology.

What is window size in NS2?

The ns-2 default maximum window size is 20; we increase that to 100 with $tcp0 set window_ 100 ; otherwise we will see an artificial cap on the cwnd growth (in the next section we will increase this to 65000). The script itself is in a file basic1.