Media Access Control

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Media Access Control

(MAC) The lower sublayer of the OSI data link layer. The interface between a node's Logical Link Control and the network's physical layer. The MAC differs for various physical media.

See also MAC Address, Ethernet, IEEE 802.3, token ring.

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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 local networks (see 802.3). The common MAC layer technologies are CSMA/CD for Ethernet and CSMA/CA for 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, TCP/IP, 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.
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References in periodicals archive ?
MAC sublayer of stations operating in an IEEE 802.11 LAN proposes three coordination functions which control access to the wireless medium: (1) DCF, the standard basis, (2) Hybrid Coordination Function (HCF) present only in QoS stations and (3) Point Coordination Function (PCF) optional, used for contention-free services.
The lower Mac level is similarly sublayered into a mac-low and a mac-middle sublayering, with media access categorised as the middle MAC sublayer.
The PHY-dependent MAC sublayer parameters pertaining to UWB PHY, being specified in the IEEE 802.15.6 standard are used to obtain our results.
The key specifications of Bluetooth refer to the physical layer and MAC sublayer, where different protocols have been developed for different applications.
Representative examples are as follows: the inter-PHY protocol developed within the IEEE P1901 working group that allows coexistence among two different broadband PLC devices [6]; the ITU-T standard that has been conceived with the aim of offering interconnectivity among in-home high speed communication devices working over telephone wires, power lines, and coax [6, 7] ( specifies the PHY layer and the MAC sublayer and addresses the coexistence between protocols that operate on different media); the solution developed within the EU-FP7 OMEGA project, according to which devices belonging to the OMEGA network share the same inter-MAC sublayer and consequently they can coexist and they can be interconnected [8].
(5) If the channel is accessed to be idle, the MAC sublayer must ensure that the contention window is expired before starting transmission.
For the downlink layer, the scheduler in the MAC sublayer of the eNB allocates the available radio resources among different UE's in a cell through proper handling of priority [8].
Since WSN involve sending all data monitored to a sink and we are concentrating on future channel assignment, we will focus this paper on the popular 2.4 GHz range of operation and the MAC sublayer to formulate our outcome for a future green multichannel multiradio WSN.
IEEE P802.15.3b[TM], "Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Amendment to MAC Sublayer," will modify IEEE 802.15.3[TM] to improve the ease of implementation and interoperability.
A more feasible solution is high-layer convergence sublayer solution, i.e., a common convergence sublayer above MAC sublayer. It is the only viable option for current MS and network systems, because it minimizes modifications at low layers of heterogeneous networks.
[5] IEEE Standard for IEEE Amendment to Part 15.3: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for High Rate Wireless Personal Area Networks (WPAN): Amendment to MAC Sublayer, 2006.
The aMinMPDUOverhead is the minimum number of bytes added by the MAC sublayer to the PSDU and has a constant of 9.