MAC layer


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MAC layer

(Media Access Control layer) The part of the data link protocol that controls access to the physical transmission medium in IEEE 802 networks (LANs). The common MAC layer standards are CSMA/CD and CSMA/CA, which are used in Ethernet and Wi-Fi. Earlier MAC layers were the token passing methods in Token Ring, FDDI and MAP. MAC layer functionality is built into the network adapters, which includes a unique serial number that identifies the vendor and adapter (see OUI). See data link protocol, OSI model, CSMA/CD, CSMA/CA and Ethernet.


The Bottom Layers
In IEEE 802 networks, the data link layer is split into two sublayers. The Logical Link Control (LLC) is an interface to the Media Access Control (MAC) layer. The MAC is also physical hardware, because the processes have been embedded into the transceiver chips. See IEEE 802, SNA, OSI model and Token Ring.
References in periodicals archive ?
Further, in MAC layer, RLC message is processed with the proposed S-RLNC-MGM model where the data packet is split into K equal-size source symbols from which a stream of S-RNLC processed symbol is generated.
The 802.11 Application Framework also supports up to 80 MHz of real-time bandwidth and full bidirectional communications and includes MAC layer features including CSMA/CA, RTS, CTS, NAV and retransmission.
The indicated proposal targets at contributing a Time Stationed Traffic Prioritization Protocol at the MAC layer, in which the biosensor node demoniacally gives attention to each and every desired communication transmittal and adopts the sleep span.
IEEE 802.11 MAC layer misbehavior can be caused by naive attack or smart attack in [8] and several attacks modify the backoff algorithm as declared in [9].
In addition to MAC layer approach, Cherian and Nair [36] presented the priority queuing model at the node based on average waiting time.
The existing cooperation techniques mentioned above do not consider cross-layer coordination between physical layer, MAC layer, and network layer.
Application and MAC layer performance parameters include sent and received traffic statistics, end to end delay among the layers, packet delivery ratio, retransmission attempts and throughput over the channels.
f) Packet drops: The number of packets dropped at the Mac layer is due to link failure or congestion or collisions.
IEEE 802.16a use Orthogonal Frequency Division Multiplexing (OFDM) for Physical layer and there are some additions to the MAC layer also, such as support for Orthogonal Frequency Division Multiple Access (OFDMA) [2].
Accordingly, a consecutive frame transmission in the MAC layer is required to guarantee the QoS.
The right to access the channel is coordinated by the Enhanced Distribution Coordination Access (EDCA) mechanism in the MAC layer of the IEEE 802.11p standard.
In this paper it was shown that simultaneous optimization of network parameters with PHY and MAC layers allows the throughput maximization in slow fading channel.