What are scheduled MAC protocols?

Scheduled based MAC protocol is divided into two categories. The first one is traditional TDMA MAC protocol or centralized TDMA protocols. In centralized TDMA protocols; the nodes are scheduled centrally by different time slots. The scheduling is done by cluster head (CH) or the base station (BS).

What is meant by MAC protocols?

The Medium Access Control (MAC) protocol is used to provide the data link layer of the Ethernet LAN system.

What are the two types of MAC protocols?

MAC protocols presented in the literature can be classified in two groups according to the approach used to manage medium access: contention based and schedule based [25].

What are the three types of MAC protocols?

The classification of MAC protocols or types of MAC protocol or types of MAC are:

• MAC layer protocols:
• Contention based protocols without reservation:
• Contention based protocols with reservation:
• Contention based protocols with scheduling:
• Other protocols:
• Contention based protocols without reservation:

What is the main function of MAC protocol?

The MAC protocol provides a channel of access and an addressing mechanism, so that each available node on the network may communicate with other nodes which are available – either on the same network, or on others.

What is the classification of MAC protocol?

We have classified WSN based MAC protocol as depicted in Figure 4 into four categories as; contention based, scheduling based, channel polling based, and hybrid protocols.

Is MAC a protocol?

No, the MAC is not a protocol in that you won’t find any ‘MAC spec’ that you can implement. MACs are typically embedded in hardware devices and expose functionality to send and receive frames to the media that they’re controlling.

What is the purpose of MAC sublayer?

Media Access Control (MAC) sublayer provides control for accessing the transmission medium. It is responsible for moving data packets from one network interface card (NIC) to another, across a shared transmission medium. Physical addressing is handled at the MAC sublayer. MAC is also handled at this layer.

What are the objectives of MAC protocol?

Thus the MAC protocol helps fulfilling important design objectives of WSNs by specifying how nodes employ the radio, share the channel, avoid collision in correlated and broadcasting environments, response the inquirer timely, and survive for a longer period.

What is contention free protocol?

A MAC protocol is contention-free if messages do not collide during its execution. Contention- free MAC protocols are typically based on time division multiplexing access (TDMA) of the wireless medium, assuming that all the sensor nodes are time-synchronized in some way.