Mac protocols in computer networks

The proposed multichannel protocol guarantees an interference-free communication.

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The proposed approach is simulated and compared against other similar MAC protocols, in terms of data-rate, control overhead and energy. Experimental results indicate that the multi-channel MAC gives better results when compared to single channel MAC protocols. Implementation of the proposed approach is tested using Berkley motes and by using custom designed mobile node. Mohamed Mubarak, T.

Di Francesco, M. Data collection in wireless sensor networks with mobile elements: A survey.

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Caldeira, J. Rodrigues, and P. Tonneau, N. Mitton, and J. Vandaele, How to choose an experimentation platform for wireless sensor networks?

The Medium Access Sublayer (MAC)

Munir, C. Canfeng, J. Ma, and X. Namboodiri and L. A survey on routing techniques supporting mobility in sensor networks.

What is Media Access Control layer (MAC layer)? - Definition from

In Mobile ad-hoc and sensor networks, Srikanth, M. Harish, and R. Sreejith, P. Khandelwal, K. Anupama, and L. Anastasi, M. Conti, M. Di Francesco, and A. Passarella, Energy conservation in wireless sensor networks: A survey, Ad hoc networks, vol. Yick, B. Mukherjee, and D. Ghosal, Wireless sensor network survey, Computer networks, vol. Loo, J. Mauri, and J. Dong and W. Suri, A. Hansson, J. Nilsson, P. Lubkowski, K. Marcus, M.

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Hauge, K. Lee, B. Standards for wireless communications exist for different applications: cellular telephony, satellite communications, broadcast radio, local area networks, and so forth. Three well-known standards for wireless data communication have been proposed for use in WSNs, each with certain advantages.

Introduction of MAC Address in Computer Network

However, WSNs do not have widely accepted standard communication protocols in any of the layers in the OSI model sense. The following subsections describe standardized protocols which may match WSN requirements. The protocols provide wireless data transmission with appropriate data rates for a wide range of applications, they can be implemented in battery-powered devices, and they do not require complicated planning and setup.

Several commercial products use these wireless standards, which could be an advantage for WSNs in cost and ease of implementation. The purpose of this section is to familiarize the reader with the standards, show their advantages and disadvantages, and discuss their use in WSNs. The MAC protocol has two modes [ 9 ]. Mode with no central device controlling the communication. Carrier sensing: a node senses the medium.

If it is idle, the node transmits the data frame.

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If the medium is busy, the node waits until it becomes idle again, waits for a random time and transmits. Upon frame reception, the receiver node answers with an ACK acknowledgment control frame. If a collision occurs, transmitting nodes wait a random time and try again later.

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  • Introduction of MAC Address in Computer Network?

Virtual carrier sensing: a node with a frame to transmit senses the medium. If it is idle, the node sends a control frame called RTS request to send , which contains the intended receiver address and the time required to send the information transmission delay. If the destination node agrees to communicate, it will answer with a CTS clear to send control frame which also contains the delay.

All nodes hearing RTS or CTS should refrain from transmission until the transmission delay has elapsed and the medium is idle again.

1. Introduction

The receiver must respond with an ACK for each data frame received. A special node, the access point AP , polls every node and controls the communication process. An AP periodically broadcasts a beacon control frame with parameters and invitations to join the network [ 9 ]. Advantages of IEEE Data rates are high for wireless end user transmission and radio ranges can be hundreds of meters. Also, as IEEE Disadvantages include the large overhead in control and data packets. Another possibility is using UDP which employs less overhead, 8 bytes for the header.

Perhaps the most important problem for using Even though the standard has power saving mechanisms, according to Ferrari et al. In this standard, the physical layer uses 2. However, some Bluetooth devices have meter range [ 12 ]. An These networks are referred to as piconets and several piconets may communicate using a bridge node, forming a scatternet. In one time slot, the master will poll a single slave, inquiring if it has something to send. If the slave has data to transmit, it sends it to the master in the next time slot [ 13 ].

A master node must periodically transmit, even if there is no data to be exchanged, to keep slaves synchronized. Slaves cannot communicate directly; the information must go through the master node.