Siemens IEEE802.11 Manual de usuario

Maximilian RiegelICM Networks, Advanced Standardization

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 10 © Siemens, 2002httptcpippppBluetoothNetscapeip802.2802.2 80

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 11 © Siemens, 2002What is unique about wireless?n Difficult media– interfe

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 12 © Siemens, 2002Part 2: IEEE802.11 Overviewn Wireless IEEE802.11 Standar

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 13 © Siemens, 2002Wireless IEEE802.11 Standardn Operation in the 2.4GHz IS

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 14 © Siemens, 2002StationAH3StationStationAH1AH2Ad Hoc NetworkIEEE802.11 C

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 15 © Siemens, 2002IEEE802.11 Architecture Overviewn One common MAC support

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 16 © Siemens, 2002IEEE802.11 Protocol Architecturen Station Management– in

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 17 © Siemens, 2002Wireless LAN Standardization0$&3+<Current standar

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 18 © Siemens, 2002Part 3: Physical layern IEEE802.11 2.4 GHz & 5 GHz P

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 19 © Siemens, 2002IEEE802.112.4 GHz & 5 GHz Physical LayersTimeFrequen

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 2 © Siemens, 2002Prolog:The ubiquitous WLANn Today’s road worriers require

, © Siemens, 2002AMPLITUDEFREQUENCYTIME123456789101112f1f2f3f4f5Frequency Hopping Spread Spectrumn 2.4GHz band is 83.5MHz wide (US & Europe)n Ban

, © Siemens, 200211 chips1 bit period11 chips 1 bitperiodDataPRNOut11 Bit Barker Code (PRN*)0100100011110110111000Transmitter baseband signal after s

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 22 © Siemens, 2002DSSS Transmit Spectrum and Channelsfcfc -11 MHzfc -22 MH

, © Siemens, 2002IEEE802.11a 5GHz PHY Layern Specifications– Modulation type OFDM– Data rates: 6, 12, 18, 24, 36, 48, 54Mbps– 48 sub-carriers– Sub-ca

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 24 © Siemens, 2002IEEE802.11g: Further Speed Extension for the 2.4GHz Band

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 25 © Siemens, 2002)UHT*+]      

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 26 © Siemens, 2002IEEE802.11h: Spectrum and Transmit Power Managementn TPC

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 27 © Siemens, 2002… when will 5 GHz WLANs come?n IEEE802.11b (2.4 GHz) is

, © Siemens, 2002PHY Terminologyn FHSS Frequency Hoping Spread Spectrumn DSSS Direct Sequence Spread Spectrumn OFDM Orthogonal Frequency Division Mul

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 29 © Siemens, 2002Physical Layer Convergence Protocol (PLCP)n SYNC (gain s

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 3 © Siemens, 2002Prolog:WLAN has taken off ...n Lots of serious WLAN activ

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 30 © Siemens, 2002Part 4: Medium Access Controln Basic Access Protocol Fea

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 31 © Siemens, 2002Basic Access Protocol Featuresn Use Distributed Coordina

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 32 © Siemens, 2002DIFSContention WindowSlot time'HIHU$FFHVVBackoff-W

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 33 © Siemens, 2002AckDataNext MPDUSrcDestOtherContention WindowDefer Acces

, © Siemens, 2002Tx Data to STA 2Rx data from STA 1Detects channel busyStation 1Station 2Station 3Station 4Short deferralDistributed inter-frame defe

, © Siemens, 2002STA “B” cannot receive data from STA “A”Problem – Stations contending for the medium do not Heareach otherSTA “B” STA“A”RTS-RangeAcc

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 36 © Siemens, 2002IEEE802.11e: MAC Enhancementsfor Quality of Service (EDC

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 37 © Siemens, 2002BeaconContention Free PeriodContention PeriodCFP repetit

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 38 © Siemens, 2002IEEE802.11e: MAC Enhancements for Quality of Service (HC

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 39 © Siemens, 2002FrameControlDurationIDAddr 1 Addr 2 Addr 3 Addr 46HTXHQF

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 4 © Siemens, 2002Outlinen Part 1: Wireless Internet System Architecturen P

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 40 © Siemens, 2002To DS From DS Address 1 Address 2 Address 3 Address 40 0

, © Siemens, 2002Summary: MAC Protocol Featuresn Distributed Coordination Function (DCF) provides efficientmedium sharing– Use Carrier Sense Multiple

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 42 © Siemens, 2002Part 5: MAC layer managementn Infrastructure Beacon Gene

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 43 © Siemens, 2002Time AxisBeacon IntervalXXXX"Actual time" stam

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 44 © Siemens, 2002Timing Synchronization Function (TSF)n All stations main

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 45 © Siemens, 2002Scanningn Scanning required for many functions.– finding

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 46 © Siemens, 2002n Initial connection to an Access Point– Reassociation f

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 47 © Siemens, 2002Power Management Considerationsn Mobile devices are batt

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 48 © Siemens, 2002Power Management Approachn Allow idle stations to go to

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 49 © Siemens, 2002TIMTIM-IntervalTime-axisBusy MediumTx operationAP activi

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 5 © Siemens, 2002Part 1: Wireless Internet system architecturen Generic In

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 50 © Siemens, 2002MAC Management Framesn Beacon– Timestamp, Beacon Interva

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 51 © Siemens, 2002Part 6: WLAN Mobilityn IEEE802.11 Ad Hoc Moden IEEE802.1

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 52 © Siemens, 2002Peer-to-Peer NetworkIEEE802.11 Ad Hoc Moden Independent

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 53 © Siemens, 2002BSS-ADistribution System (DS)BSS-BServerIEEE802.11 Infra

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 54 © Siemens, 2002Mobility inside a WLAN ‘hotspot’ by link layer functions

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 55 © Siemens, 2002IEEE802.11f: Inter-Access Point Protocol (IAPP)n IAPP de

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 56 © Siemens, 2002Part 7: WLAN securityn IEEE802.11 Privacy and Access Con

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 57 © Siemens, 2002IEEE802.11 Privacy and Access Controln Goal of 802.11 wa

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 58 © Siemens, 20023UHDPEOH3/&3 +HDGHU0$&+HDGHU&5&3D\ORDG(

, © Siemens, 2002Access PointSecret Key Loaded LocallyStationSecret Key Loaded Locally6WDWLRQVHQGVDXWKHQWLFDWLRQUHTXHVW$3VHQGVFKDOOHQJHWH[WJHQ

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 6 © Siemens, 2002Internet/Web ApplicationsGeneric Internet network archite

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 60 © Siemens, 2002Shortcomings of plain WEP securityn WEP unsecure at any

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 61 © Siemens, 2002IEEE802.11i:Robust Security Network (RSN)Additional enha

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 62 © Siemens, 2002A last word about WLAN security:n Even IEEE802.11i may

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 63 © Siemens, 2002Summary: MAC Functionalityn Independent and Infrastructu

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 64 © Siemens, 2002Part 8: Public hotspot operationn Serving customers in p

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 65 © Siemens, 2002Congress hall,HotelAirportRailway StationCampusOfficeHos

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 66 © Siemens, 2002One solution for every place (hotspot)n There is a wide

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 67 © Siemens, 2002Becoming a WLAN operator is easy.n Legal aspects (in Ger

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 68 © Siemens, 2002Selling WLAN access in public hot-spots:Probably to cons

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 69 © Siemens, 2002Authentication for Internet accessSelection of billing m

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 7 © Siemens, 2002user dataappl. headertcp header application dataip header

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 70 © Siemens, 2002How does it work:Web based access controlLQWHUQHWPasswor

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 71 © Siemens, 2002Web based access control: Enabler for mCommerce and loca

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 72 © Siemens, 2002Functions of an integrated access gateway (User manageme

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 73 © Siemens, 2002Functions of an integrated access gateway (Network servi

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 74 © Siemens, 2002Part 9: WLAN – UMTS Interworkingn UMTS and Wireless LAN

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 75 © Siemens, 2002UMTS and Wireless LAN are different.GSM/GPRS/UMTSn anyti

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 76 © Siemens, 2002PSTNPLMN accessPLMN coreVLRHSSAUCSGSNSCPLNPINGGSNTDM / A

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 77 © Siemens, 2002tight couplingAPWLAN as an extension of a mobile network

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 78 © Siemens, 2002WLAN is much cheaper than 2G/3G* based on current IP vol

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 79 © Siemens, 2002When you can’t stop them, when you can’t beat them,then

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 8 © Siemens, 2002IEEE802.11 - seamless integration into the InternetKWPO [

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 80 © Siemens, 2002PSTNPLMN accessPLMN coreVLRHSSAUCSGSNSCPLNPINTDM / ATM /

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 81 © Siemens, 2002HLRSGSNSIMloose coupling (SIM)HLRRADIUSloose coupling (R

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 82 © Siemens, 2002mobilenetworkHLRE.g.: Web based authentication and mobil

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 83 © Siemens, 2002Standards for WLAN/UMTS interworkingn 3GPP– R5: SA1Requi

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 84 © Siemens, 2002The endn Thank you for your attention.n Questions and co

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