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PRESENTATION
ON
IEEE 802.11
Prepared By:
Shreejan Acharya
BEX 68114
Slides Includes
Introduction
Physical Layer
Architecture
Frame format
Different Protocols
Media Access Control (MAC)
Introduction
 Created and maintained by IEEE
 Set of media control(MAC) and physical layer
 Used to implement wireless ...
Introduction cntd.
Adopted in 1997
Family of 802
Origins in a 1985 ruling by the U.S. Federal
Communications commission...
802.11 Physical Layer (PHY)
The 802.11 physical layer (PHY) is the interface
between the MAC and the wireless media where...
Architectures
Station (STA) Architecture:
 It contains IEEE 802.11
conformant MAC and PHY
interface to the wireless
mediu...
General terminologies
BSS (basic service set):
Group of stations that communicate each other
IBSS(independent basic ser...
BSS IBSS
General terminologies cntd
Service Set Identifier (SSID):
It is network name similar to domain id
One network (ESS or I...
Frame format
Bytes 2 22 6 6
6
66 2 6 0-
2312
4
Frame control Durati
on ID
A1 A2 A3 seq.ctr
l
A4 Frame
body
CRC
802.11 MAC ...
protocols
802.11 legacy
Release in Jun 1997
Original version of 802.11
Specifies two net bit rate 1or 2 mbits per sec
...
802.11a(ofdm waveform)
Release in sep 1999
Data rates 1.5 to 54 mbit/s
First widely accepted 802 family
Operates at 5G...
802.11b
Release on the market in 2000
Maximum raw data rate of 11mbit/s
High throughput
Low cost
Interference problem
802.11g
Release on june 2003
Operates in the 2.4 GHz band
Uses OFDM based transmission scheme
Operates at the average ...
802.11n
Release on October 2009
It is the improvement over previous 802.11
standard
It has MIMO antennas
Operates at t...
802.11ac
Release in December 2013
It is an amendment to IEEE 802.11
It has wider channels(80 or 160 MHz)
Operates at 5...
802.11ad
Release in Dec 2012
It defines new physical layer for 802.11 n/w
Operates in the 60GHz millimeter wave
spectru...
Other Protocols
802.11 AH
Estimated to release 2016
Bandwidth 900MHz
802.11 AJ
 Estimated to release 2016
Bandwidth ...
802.11 Media Access Control
 The 802.11 MAC layer provides functionality to allow reliable data
delivery for the upper la...
802.11 Media Access Control cntd
Another function of the 802.11 MAC is to
protect the data being delivered by providing
s...
Security
For security 802.11 specifies two
Authentication modes:
OSA(Opens Systems Authentication)
• Device that request...
THANK YOU
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  1. 1. PRESENTATION ON IEEE 802.11 Prepared By: Shreejan Acharya BEX 68114
  2. 2. Slides Includes Introduction Physical Layer Architecture Frame format Different Protocols Media Access Control (MAC)
  3. 3. Introduction  Created and maintained by IEEE  Set of media control(MAC) and physical layer  Used to implement wireless local area network(WLAN)  In the frequency band 2.4,3.6,5 and 60 GHz  Wi-fi refers to the IEEE 802.11 communication for WLAN The Linksys WRT54G contains a router with an 802.11b/g radio and two antennas
  4. 4. Introduction cntd. Adopted in 1997 Family of 802 Origins in a 1985 ruling by the U.S. Federal Communications commission Consist of series of half duplex over the air modulation Uses same basic protocols It uses two spread spectrum technology Frequency Hopping Spread Spectrum (FHSS)  Direct Sequence Spread Spectrum (DSSS)
  5. 5. 802.11 Physical Layer (PHY) The 802.11 physical layer (PHY) is the interface between the MAC and the wireless media where frames are transmitted and received.  The PHY provides three functions.  First, the PHY provides an interface to exchange frames with the upper MAC layer for transmission and reception of data. Secondly, the PHY uses signal carrier and spread spectrum modulation to transmit data frames over the media.  Thirdly, the PHY provides a carrier sense indication back to the MAC to verify activity on the media.
  6. 6. Architectures Station (STA) Architecture:  It contains IEEE 802.11 conformant MAC and PHY interface to the wireless medium, but does not provide access to a distribution system Access-Point Architecture:  Device that contains IEEE802.11 conformant MAC and PHY interface to the wireless medium, and provide access to a distribution system for associated stations  Implemented in infra- structure products that connect to wired backbones
  7. 7. General terminologies BSS (basic service set): Group of stations that communicate each other IBSS(independent basic service set): It is a BSS without access point Extended Service Set (ESS): A set of one or more Basic Service Sets inter connected by a distribution System (DS)
  8. 8. BSS IBSS
  9. 9. General terminologies cntd Service Set Identifier (SSID): It is network name similar to domain id One network (ESS or IBSS) has one SSID Basic Service Set Identifier (BSSID) It is cell identifier and is 6 octets long Similar to NW ID in pre-IEEE Wave LAN systems
  10. 10. Frame format Bytes 2 22 6 6 6 66 2 6 0- 2312 4 Frame control Durati on ID A1 A2 A3 seq.ctr l A4 Frame body CRC 802.11 MAC header Bits :2 2 2 4 1 1 1 1 1 1 1 Protocol version type Sub type To DS From DS More flag Retry Pwr Mgt More data wep rsvd Frame control Field
  11. 11. protocols 802.11 legacy Release in Jun 1997 Original version of 802.11 Specifies two net bit rate 1or 2 mbits per sec It has forward error correction code Three alternatives physical layer Diffuse infrared Frequency hopping spread spectrum Direct sequence spread spectrum
  12. 12. 802.11a(ofdm waveform) Release in sep 1999 Data rates 1.5 to 54 mbit/s First widely accepted 802 family Operates at 5GHz frequency band Less range
  13. 13. 802.11b Release on the market in 2000 Maximum raw data rate of 11mbit/s High throughput Low cost Interference problem
  14. 14. 802.11g Release on june 2003 Operates in the 2.4 GHz band Uses OFDM based transmission scheme Operates at the average bit rate of 22 Mbit/s or maximum 54 Mbit/s Its hardware are full back compatible with 802.11b hardware
  15. 15. 802.11n Release on October 2009 It is the improvement over previous 802.11 standard It has MIMO antennas Operates at the 2.4 GHz or less than 5GHz bands Data rates from 54 Mbit/s to 600 Mbit/s
  16. 16. 802.11ac Release in December 2013 It is an amendment to IEEE 802.11 It has wider channels(80 or 160 MHz) Operates at 5GHz band It supports multi-user MIMO Data rates up to 1300 Mbit/s
  17. 17. 802.11ad Release in Dec 2012 It defines new physical layer for 802.11 n/w Operates in the 60GHz millimeter wave spectrum Product implementing this standard are being brought under the name of wigig brand Peak transmission rate 7 Gbit/s
  18. 18. Other Protocols 802.11 AH Estimated to release 2016 Bandwidth 900MHz 802.11 AJ  Estimated to release 2016 Bandwidth 24/60 802.11 AX Estimated to release 2019 Bandwidth 2.4/5
  19. 19. 802.11 Media Access Control  The 802.11 MAC layer provides functionality to allow reliable data delivery for the upper layers over the wireless PHY media.  The data delivery itself is based on an asynchronous, best-effort, connectionless delivery of MAC layer data.  There is no guarantee that the frames will be delivered successfully.  The 802.11 MAC provides a controlled access method to the shared wireless media called Carrier-Sense Multiple Access with Collision Avoidance (CSMA/CA).  CSMA/CA is similar to the collision detection access method deployed by 802.3 Ethernet LANs.
  20. 20. 802.11 Media Access Control cntd Another function of the 802.11 MAC is to protect the data being delivered by providing security and privacy services.  Security is provided by the authentication services and by Wireless Equivalent Privacy (WEP), which is an encryption service for data delivered on the WLAN.
  21. 21. Security For security 802.11 specifies two Authentication modes: OSA(Opens Systems Authentication) • Device that request to access the network is granted without any security check Shared Key Authentication • Device that request to access the network is granted with security check • WEP: wired equivalent privacy ESSID offers casual separation of traffic
  22. 22. THANK YOU
  • KetsiaOndo

    May. 28, 2020
  • KhatijatulKubra

    Jan. 9, 2020
  • shreejanacharya

    May. 27, 2019
  • NagarajPaul

    Nov. 30, 2018
  • PamelaNandhini

    Sep. 1, 2018
  • MayurKale12

    Jul. 18, 2018
  • SulthanaMohammad

    Apr. 8, 2018
  • PrathyushaReddyRamaiahgari

    Oct. 12, 2017
  • FrankMtutwa

    Jun. 23, 2017
  • adityabhardwaj72

    May. 28, 2017
  • BipeenKanade

    Nov. 6, 2016
  • ainnur2

    Jun. 26, 2016
  • KishanSahni

    Jun. 2, 2016
  • deepikagupta1992

    Apr. 14, 2016
  • shumaillkhan

    Mar. 5, 2016
  • WalaaNasser3

    Feb. 22, 2016

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