1 chapter 5 the medium access sublayer. 2 chapter 5 the medium access layer 5.1 the channel...
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Chapter 5
The Medium Access Sublayer
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Chapter 5 The Medium Access Layer
• 5.1 The Channel Allocation problem - Static and dynamic channel allocation in LANs & MANs
• 5.2 Multiple Access Protocols - ALOHA, CSMA, CSMA/CD, Collision-free protocols, Limited-
contention protocols, Wireless LAN protocols
• 5.3 Ethernet - Cabling, MAC sublayer protocol, Backoff algorithm, Performance,
Gigabit Ethernet, 802.2 Logical Link Control
• 5.4 Wireless LANs - 802.11 protocol stack, physical layer, MAC sublayer protocol,
frame structure
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• 5.5 Broadband Wireless - Comparison of 802.11 with 802.16, protocol stack, frame
structure
• 5.6 Bluetooth - Bluetooth architecture, Application, Protocol stack, Frame
structure
• 5.7 Data Link Layer Switching - Bridges from 802.x to 802.y, Local internetworking, Spanning
tree bridges, Remote bridges
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5.1 The Channel Allocation problem5.1.1 Static channel Allocation in LANs and WANs
Frequency Division Multiplexing (FDM)
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5.1.2 Dynamic Channel Allocation in LANs and WANs
Assumptions1. Station Model. The model consists of N
independent stations, each generates the frame with probability in an interval . Once a frame is generated, the station is blocked.
2. Single Channel Assumption. A single channel is available for all communication.
3. Collision Assumption. If two frames are transmitted simultaneously, they are destroyed and must be retransmitted again later. There are no other errors.
t t
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4a. Continuous Time. Frame transmission can begin at any instant.
4b. Slotted Time. Time is divided into slots. Frame transmission always begin at the start of a slot.
5a. Carrier Sense. Stations can tell if the channel is in use before trying to use it.
5b. No Carrier Sense. Stations cannot sense the channel before trying to use it.
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5.2 Multiple Access Protocols5.2.1 ALOHA
5-1.
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5-2.
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5-3.
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5.2.2 Carrier Sense Multiple Access Protocols
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5-4.
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5-5.