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The Medium Access Control Sublayer Chapter 4 12/13/2015www.ishuchita.com1.

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Presentation on theme: "The Medium Access Control Sublayer Chapter 4 12/13/2015www.ishuchita.com1."— Presentation transcript:

1 The Medium Access Control Sublayer Chapter 4 12/13/2015www.ishuchita.com1

2 The Channel Allocation Problem Static Channel Allocation in LANs and MANs Dynamic Channel Allocation in LANs and MANs 12/13/2015www.ishuchita.com2

3 Dynamic Channel Allocation in LANs and MANs 1.Station Model. 2.Single Channel Assumption. 3.Collision Assumption. 4.(a) Continuous Time. (b) Slotted Time. 5.(a) Carrier Sense. (b) No Carrier Sense. 12/13/2015www.ishuchita.com3

4 Multiple Access Protocols ALOHA Carrier Sense Multiple Access Protocols Collision-Free Protocols Limited-Contention Protocols Wavelength Division Multiple Access Protocols Wireless LAN Protocols 12/13/2015www.ishuchita.com4

5 Pure ALOHA In pure ALOHA, frames are transmitted at completely arbitrary times. 12/13/2015www.ishuchita.com5

6 Pure ALOHA (2) Vulnerable period for the shaded frame. 12/13/2015www.ishuchita.com6

7 Pure ALOHA (3) Throughput versus offered traffic for ALOHA systems. 12/13/2015www.ishuchita.com7

8 Persistent and Nonpersistent CSMA Comparison of the channel utilization versus load for various random access protocols. 12/13/2015www.ishuchita.com8

9 CSMA with Collision Detection CSMA/CD can be in one of three states: contention, transmission, or idle. 12/13/2015www.ishuchita.com9

10 Collision-Free Protocols The basic bit-map protocol. 12/13/2015www.ishuchita.com10

11 Collision-Free Protocols (2) The binary countdown protocol. A dash indicates silence. 12/13/2015www.ishuchita.com11

12 Limited-Contention Protocols Acquisition probability for a symmetric contention channel. 12/13/2015www.ishuchita.com12

13 Adaptive Tree Walk Protocol The tree for eight stations. 12/13/2015www.ishuchita.com13

14 Wavelength Division Multiple Access Protocols Wavelength division multiple access. 12/13/2015www.ishuchita.com14

15 Wireless LAN Protocols A wireless LAN. (a) A transmitting. (b) B transmitting. 12/13/2015www.ishuchita.com15

16 Wireless LAN Protocols (2) The MACA protocol. (a) A sending an RTS to B. (b) B responding with a CTS to A. 12/13/2015www.ishuchita.com16

17 Ethernet Ethernet Cabling Manchester Encoding The Ethernet MAC Sublayer Protocol The Binary Exponential Backoff Algorithm Ethernet Performance Switched Ethernet Fast Ethernet Gigabit Ethernet IEEE 802.2: Logical Link Control Retrospective on Ethernet 12/13/2015www.ishuchita.com17

18 Ethernet Cabling The most common kinds of Ethernet cabling. 12/13/2015www.ishuchita.com18

19 Ethernet Cabling (2) Three kinds of Ethernet cabling. (a) 10Base5, (b) 10Base2, (c) 10Base-T. 12/13/2015www.ishuchita.com19

20 Ethernet Cabling (3) Cable topologies. (a) Linear, (b) Spine, (c) Tree, (d) Segmented. 12/13/2015www.ishuchita.com20

21 Ethernet Cabling (4) (a) Binary encoding, (b) Manchester encoding, (c) Differential Manchester encoding. 12/13/2015www.ishuchita.com21

22 Ethernet MAC Sublayer Protocol Frame formats. (a) DIX Ethernet, (b) IEEE 802.3. 12/13/2015www.ishuchita.com22

23 Ethernet MAC Sublayer Protocol (2) 12/13/2015www.ishuchita.com23

24 Ethernet Performance Efficiency of Ethernet at 10 Mbps with 512-bit slot times. 12/13/2015www.ishuchita.com24

25 Switched Ethernet A simple example of switched Ethernet. 12/13/2015www.ishuchita.com25

26 Fast Ethernet The original fast Ethernet cabling. 12/13/2015www.ishuchita.com26

27 Gigabit Ethernet (a) A two-station Ethernet. (b) A multistation Ethernet. 12/13/2015www.ishuchita.com27

28 Gigabit Ethernet (2) Gigabit Ethernet cabling. 12/13/2015www.ishuchita.com28

29 IEEE 802.2: Logical Link Control (a) Position of LLC. (b) Protocol formats. 12/13/2015www.ishuchita.com29

30 Wireless LANs The 802.11 Protocol Stack The 802.11 Physical Layer The 802.11 MAC Sublayer Protocol The 802.11 Frame Structure Services 12/13/2015www.ishuchita.com30

31 The 802.11 Protocol Stack Part of the 802.11 protocol stack. 12/13/2015www.ishuchita.com31

32 The 802.11 MAC Sublayer Protocol (a) The hidden station problem. (b) The exposed station problem. 12/13/2015www.ishuchita.com32

33 The 802.11 MAC Sublayer Protocol (2) The use of virtual channel sensing using CSMA/CA. 12/13/2015www.ishuchita.com33

34 The 802.11 MAC Sublayer Protocol (3) A fragment burst. 12/13/2015www.ishuchita.com34

35 The 802.11 MAC Sublayer Protocol (4) Interframe spacing in 802.11. 12/13/2015www.ishuchita.com35

36 The 802.11 Frame Structure The 802.11 data frame. 12/13/2015www.ishuchita.com36

37 802.11 Services Association Disassociation Reassociation Distribution Integration Distribution Services 12/13/2015www.ishuchita.com37

38 802.11 Services Authentication Deauthentication Privacy Data Delivery Intracell Services 12/13/2015www.ishuchita.com38

39 Broadband Wireless Comparison of 802.11 and 802.16 The 802.16 Protocol Stack The 802.16 Physical Layer The 802.16 MAC Sublayer Protocol The 802.16 Frame Structure 12/13/2015www.ishuchita.com39

40 The 802.16 Protocol Stack The 802.16 Protocol Stack. 12/13/2015www.ishuchita.com40

41 The 802.16 Physical Layer The 802.16 transmission environment. 12/13/2015www.ishuchita.com41

42 The 802.16 Physical Layer (2) Frames and time slots for time division duplexing. 12/13/2015www.ishuchita.com42

43 The 802.16 MAC Sublayer Protocol Service Classes Constant bit rate service Real-time variable bit rate service Non-real-time variable bit rate service Best efforts service 12/13/2015www.ishuchita.com43

44 The 802.16 Frame Structure (a) A generic frame. (b) A bandwidth request frame. 12/13/2015www.ishuchita.com44

45 Bluetooth Bluetooth Architecture Bluetooth Applications The Bluetooth Protocol Stack The Bluetooth Radio Layer The Bluetooth Baseband Layer The Bluetooth L2CAP Layer The Bluetooth Frame Structure 12/13/2015www.ishuchita.com45

46 Bluetooth Architecture Two piconets can be connected to form a scatternet. 12/13/2015www.ishuchita.com46

47 Bluetooth Applications The Bluetooth profiles. 12/13/2015www.ishuchita.com47

48 The Bluetooth Protocol Stack The 802.15 version of the Bluetooth protocol architecture. 12/13/2015www.ishuchita.com48

49 The Bluetooth Frame Structure A typical Bluetooth data frame. 12/13/2015www.ishuchita.com49

50 Data Link Layer Switching Bridges from 802.x to 802.y Local Internetworking Spanning Tree Bridges Remote Bridges Repeaters, Hubs, Bridges, Switches, Routers, Gateways Virtual LANs 12/13/2015www.ishuchita.com50

51 Data Link Layer Switching Multiple LANs connected by a backbone to handle a total load higher than the capacity of a single LAN. 12/13/2015www.ishuchita.com51

52 Bridges from 802.x to 802.y Operation of a LAN bridge from 802.11 to 802.3. 12/13/2015www.ishuchita.com52

53 Bridges from 802.x to 802.y (2) The IEEE 802 frame formats. The drawing is not to scale. 12/13/2015www.ishuchita.com53

54 Local Internetworking A configuration with four LANs and two bridges. 12/13/2015www.ishuchita.com54

55 Spanning Tree Bridges Two parallel transparent bridges. 12/13/2015www.ishuchita.com55

56 Spanning Tree Bridges (2) (a) Interconnected LANs. (b) A spanning tree covering the LANs. The dotted lines are not part of the spanning tree. 12/13/2015www.ishuchita.com56

57 Remote Bridges Remote bridges can be used to interconnect distant LANs. 12/13/2015www.ishuchita.com57

58 Repeaters, Hubs, Bridges, Switches, Routers and Gateways (a) Which device is in which layer. (b) Frames, packets, and headers. 12/13/2015www.ishuchita.com58

59 Repeaters, Hubs, Bridges, Switches, Routers and Gateways (2) (a) A hub. (b) A bridge. (c) a switch. 12/13/2015www.ishuchita.com59

60 Virtual LANs A building with centralized wiring using hubs and a switch. 12/13/2015www.ishuchita.com60

61 Virtual LANs (2) (a) Four physical LANs organized into two VLANs, gray and white, by two bridges. (b) The same 15 machines organized into two VLANs by switches. 12/13/2015www.ishuchita.com61

62 The IEEE 802.1Q Standard Transition from legacy Ethernet to VLAN-aware Ethernet. The shaded symbols are VLAN aware. The empty ones are not. 12/13/2015www.ishuchita.com62

63 The IEEE 802.1Q Standard (2) The 802.3 (legacy) and 802.1Q Ethernet frame formats. 12/13/2015www.ishuchita.com63

64 Summary Channel allocation methods and systems for a common channel. 12/13/2015www.ishuchita.com64

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