A presentation OnA presentation On802.11a,b,g Wireless LAN, 802.11a,b,g Wireless LAN,

802.15 and 802.16802.15 and 802.16Preented By Preented By

Md.Masum Hossain Md.Masum Hossain Pranjal SinhaPranjal Sinha

Md.MunisMd.MunisVarun JainVarun JainAnmol JainAnmol Jain

Nsumbu NoeNsumbu Noe

What is 802.11 Wireless What is 802.11 Wireless LAN ?LAN ?• 802.11 is an evolving family of 802.11 is an evolving family of

specifications for wireless local area specifications for wireless local area networks (WLANs) developed by a working networks (WLANs) developed by a working group of the Institute of Electrical and group of the Institute of Electrical and Electronics Engineers (IEEE). There are Electronics Engineers (IEEE). There are several specifications in the family and new several specifications in the family and new ones are occasionally added. All the 802.11 ones are occasionally added. All the 802.11 specifications use the Ethernet protocol and specifications use the Ethernet protocol and Carrier Sense Multiple Access with Collision Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) for path sharing. Avoidance (CSMA/CA) for path sharing.

HistoryHistory

• There have been 5 major milestones There have been 5 major milestones in wireless internet communication.in wireless internet communication.– 802.11 – Released in 1997, the original 802.11 – Released in 1997, the original

wireless protocolwireless protocol– 802.11a – Released in late 1999802.11a – Released in late 1999– 802.11b – Released in late 1999802.11b – Released in late 1999– 802.11g – Released in mid 2003802.11g – Released in mid 2003– 802.11n – Released in 2009802.11n – Released in 2009

802.11-1997802.11-1997

• The ORIGINAL wireless protocol.The ORIGINAL wireless protocol.– Security implemented via WEPSecurity implemented via WEP

• Wired Equivalent Privacy (Legacy)Wired Equivalent Privacy (Legacy)

• Provided BandwidthProvided Bandwidth– 1 or 2 Mbit/s due to use of CSMA/CA1 or 2 Mbit/s due to use of CSMA/CA

• Relatively UnpopularRelatively Unpopular• Low interoperability due to loose Low interoperability due to loose

specificationsspecifications• Used DSSSUsed DSSS• Considered Legacy and no longer usedConsidered Legacy and no longer used

802.11a802.11a

• One of two amendments to the original One of two amendments to the original 802.11 specification released 802.11 specification released simultaneously simultaneously

• Provided up to 54 Mbit/s bandwidthProvided up to 54 Mbit/s bandwidth

• Uses OFDMUses OFDM– Orthogonal Frequency-Division Orthogonal Frequency-Division

MultiplexingMultiplexing•Transmits a signal over several sub signals for Transmits a signal over several sub signals for

higher efficiencyhigher efficiency

OFDMOFDM

802.11b802.11b

• Second of two amendments released Second of two amendments released in 1999in 1999

• Provided up to 11 Mbit/s bandwidthProvided up to 11 Mbit/s bandwidth

• Uses DSSSUses DSSS– Direct-Sequence Spread SpectrumDirect-Sequence Spread Spectrum

•Transmits a signal over several sub signals Transmits a signal over several sub signals for higher efficiencyfor higher efficiency

DSSSDSSS

802.11a and b802.11a and b

• Both introduced at the same timeBoth introduced at the same time• Both use CSMA/CABoth use CSMA/CA• 802.11a802.11a

– FasterFaster– More expensive to manufactureMore expensive to manufacture– Operated in 5Ghz bandOperated in 5Ghz band– Mainly used in industrial settingsMainly used in industrial settings

• 802.11b802.11b– SlowerSlower– Cheaper to manufactureCheaper to manufacture– Operated in 2.4Ghz band.Operated in 2.4Ghz band.– Mainly used in residential settingsMainly used in residential settings

802.11g802.11g

• Pretty much the most common Pretty much the most common wireless network in use today.wireless network in use today.

• Operates on 2.4Ghz bandOperates on 2.4Ghz band• Provides up 54Mbit/s bandwidthProvides up 54Mbit/s bandwidth

– 108Mbit/s with special implementations108Mbit/s with special implementations

• Uses OFDM for modulationUses OFDM for modulation• Adopted quickly after release for Adopted quickly after release for

cheap and high bandwidthcheap and high bandwidth

802.11n802.11n

• Newest member of the 802.11 family.Newest member of the 802.11 family.

• Has rated 600Mbit/s bandwidthHas rated 600Mbit/s bandwidth

• Introduces MIMOIntroduces MIMO– Multiple-Input Multiple-OutputMultiple-Input Multiple-Output

• OFDM ModulationOFDM Modulation– Uses higher frequencies for increased Uses higher frequencies for increased

number of carrier wavesnumber of carrier waves

What’s 802.15 ?What’s 802.15 ?• 802.15 is a communications 802.15 is a communications

specification that was approved in specification that was approved in early 2002 by the Institute of early 2002 by the Institute of Electrical and Electronics Engineers Electrical and Electronics Engineers Standards Association (IEEE-SA) for Standards Association (IEEE-SA) for wireless personal area networks wireless personal area networks (WPANs). The initial version, (WPANs). The initial version, 802.15.1, was adapted from the 802.15.1, was adapted from the Bluetooth specification and is fully Bluetooth specification and is fully compatible with Bluetooth 1.1compatible with Bluetooth 1.1

Let’s know about 802.16… Let’s know about 802.16…

• 802.16 is a group of broadband 802.16 is a group of broadband wireless communications standards wireless communications standards for metropolitan area networks for metropolitan area networks (MANs) developed by a working (MANs) developed by a working group of the Institute of Electrical group of the Institute of Electrical and Electronics Engineers (IEEE). and Electronics Engineers (IEEE).

Continued…Continued…• The original 802.16 standard, published in December The original 802.16 standard, published in December

2001, specified fixed point-to-multipoint broadband 2001, specified fixed point-to-multipoint broadband wireless systems operating in the 10-66 GHz licensed wireless systems operating in the 10-66 GHz licensed spectrum. An amendment, 802.16a, approved in spectrum. An amendment, 802.16a, approved in January 2003, specified non-line-of-sight extensions January 2003, specified non-line-of-sight extensions in the 2-11 GHz spectrum, delivering up to 70 Mbps in the 2-11 GHz spectrum, delivering up to 70 Mbps at distances up to 31 miles. Officially called the at distances up to 31 miles. Officially called the WirelessMAN™ specification, 802.16 standards are WirelessMAN™ specification, 802.16 standards are expected to enable multimedia applications with expected to enable multimedia applications with wireless connection and, with a range of up to 30 wireless connection and, with a range of up to 30 miles, provide a viable last mile technology.miles, provide a viable last mile technology.

Questions?Questions?