Wireless Lan Standards and Applications (Artech House Telecommunications Library)

247 Pages·2001·1.04 MB·English

by  Asuncion Santamaria

Wireless LAN
Standards and Applications
ForalistingofrecenttitlesintheArtechHouse
MobileCommunicationsSeries,turntothebackofthisbook.
Wireless LAN
Standards and Applications
Asunci(cid:243)n Santamar(cid:237)a
Francisco J. L(cid:243)pez-HernÆndez
Editors
Artech House
Boston (cid:149) London
www.artechhouse.com
LibraryofCongressCataloging-in-PublicationData
WirelessLANstandardsandapplications/Asunci(cid:243)nSantamar(cid:237)a,Francisco
L(cid:243)pez-HernÆndez,editors.
p. cm.(cid:151)(ArtechHousemobilecommunicationslibrary)
Includesbibliographicalreferencesandindex.
ISBN0-89006-943-3(alk.paper)
1.Localareanetworks(Computernetworks). 2.Wirelesscommunicationsystems.
I.Santamar(cid:237)a,A.(Asunci(cid:243)n). II.L(cid:243)pez-HernÆndez,F.J. III.Series.
TK5105.7 .W5752001
004.6(cid:146)8(cid:151)dc21 2001022207
BritishLibraryCataloguinginPublicationData
WirelessLANstandardsandapplications.(cid:151)(ArtechHousemobilecommunicationslibrary)
1.Localareanetworks(Computernetworks) 2.Wirelesscommunicationsystems
I.Santamar(cid:237)a,Asunci(cid:243)n II.L(cid:243)pez-HernÆndez,F.J.(FranciscoJ.)
621.3(cid:146)981
ISBN1-58053-428-7
CoverdesignbyIgorValdman
'2001ARTECHHOUSE,INC.
685CantonStreet
Norwood,MA02062
Allrightsreserved.PrintedandboundintheUnitedStatesofAmerica.Nopartofthis
bookmaybereproducedorutilizedinanyformorbyanymeans,electronicormechani-
cal,includingphotocopying,recording,orbyanyinformationstorageandretrievalsystem,
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Alltermsmentionedinthisbookthatareknowntobetrademarksorservicemarks
havebeenappropriatelycapitalized.ArtechHousecannotattesttotheaccuracyofthis
information.Useofaterminthisbookshouldnotberegardedasaffectingthevalidityof
anytrademarkorservicemark.
InternationalStandardBookNumber:0-89006-943-3
LibraryofCongressCatalogCardNumber:2001022207
10987654321
ToMarcos,Daniel,Lucas,
Luisa,Javier,Jaime,andRaquel,
andtoallthepeoplewhoencouragedustodothisbook.
.
Contents
Preface xi
Acknowledgments xi
Introduction 1
1.1 Introductiontowirelesslocalareanetworks(LANs) 1
1.2 Theneedforstandardization 2
1.3 Futuretrends 3
References 7
Selected Bibliography 8
TheIrDAStandard 9
2.1 IntroductiontotheIrDA(cid:151)Generaldescription 9
2.1.1 Thestandardprotocolstack 11
2.2 Physicallayer(SIR) 13
2.2.1 Generaldescriptionofthephysicallayerspecification 13
2.2.2 Specificationsforsignalsatbitratesfrom2.4Kbpsto115.2Kbps 14
2.2.3 Specificationsforsignalsatbitratesof0.576Mbpsand1.152Mbps 15
2.2.4 Specificationsforsignalsatbitratesof4Mbps 17
2.2.5 Opticalinterfacecharacteristics 21
2.3 Serialinfraredlinkaccessprotocol(IrLAP) 22
2.3.1 ServicesprovidedbyIrLAP:Connectionlessservices 24
2.3.2 ServicesprovidedbyIrLAP:Connection-orientedservices 24
2.3.3 Configurationsandoperatingcharacteristics 25
2.3.4 IrLAPframestructure 26
2.3.5 IrLAPframetypes 26
vii
viii WirelessLANStandardsandApplications
2.4 IRDAlinkmanagementprotocol(IrLMP) 28
2.4.1 Linkmanagementmultiplexor(LM-MUX) 28
2.4.2 Informationaccessservice(IAS) 33
2.5 IRDAtransportprotocol:TinyTP 35
2.5.1 TinyTPframesformat 36
2.5.2 Flowcontrol 36
2.6 LANaccessextensionsforlinkmanagement
protocol:IrLAN 38
2.6.1 IrLANgeneraldescription 38
2.6.2 Accessmethods 39
2.6.3 Framessizeandformat 41
References 43
TheIEEE802.11Standard 45
3.1 IntroductiontoIEEE802.11:Generaldescription 45
3.2 Mediumaccesscontrol(MAC)fortheIEEE802.11
wirelessLANs(WLANs) 47
3.2.1 ExpectedfeaturesofaWLANMACprotocol 48
3.2.2 ThestructureoftheIEEEstandardMACprotocol 54
3.2.3 ComparisonwiththeMACprotocolofotherWLANs:HIPERLAN 65
3.2.4 Conclusions 69
3.3 PhysicallayerforIEEE802.11wirelessLANs:
Radiosystems 69
3.3.1 Introduction 69
3.3.2 Spreadspectrumtechniques 71
3.3.3 Frequencyhoppingtechniques 72
3.3.4 Directsequencesystems 75
3.3.5 IEEE802.11frequencyhoppingphysicallayer 83
3.3.6 IEEE802.11directsequencephysicallayer 89
3.3.7 ComparisonoftheFHSSandDSSSphysicallayers 93
3.4 PhysicallayerforIEEE802.11wirelessLANS:
Infraredsystems 96
3.4.1 Description 96
3.4.2 Thephysicallayerconvergenceprocedure(IR-PLCP) 97
3.4.3 TheIRphysicalmediumsublayer(IR-PMD) 99
3.5 Conclusionsandapplications 104
References 105
Contents ix
TheHIPERLANStandard 109
4.1 Introduction:Terminology 109
4.2 Physicallayer(PHY) 113
4.2.1 Introduction 113
4.2.2 Transmissioncharacteristics 114
4.2.3 Databursts 116
4.2.4 Channelaccessbursts 118
4.2.5 Receivercharacteristics 118
4.2.6 Compatibilitybetweentransmitterandreceiverclasses 119
4.2.7 Establishingadeferthreshold 119
4.3 HIPERLANchannelaccesscontrol(CAC) 121
4.3.1 Generalities 121
4.3.2 HIPERLANCACprotocoldataunits(HCPDUs) 122
4.3.3 Channelaccess 124
4.3.4 Channelaccessinthefreechannelcondition 126
4.3.5 Channelaccessinthesynchronizedchannelcondition 127
4.3.6 Hiddennodedetectionandoperation 130
4.4 HIPERLANmediumaccesscontrol(MAC) 131
4.4.1 HIPERLANMACfunctions 131
4.4.2 HIPERLANdifferentiationandaddressing 132
4.4.3 Dataencryption 133
4.4.4 Power-savingfunction 133
4.4.5 MACinformationdatabases 135
4.4.6 Prioritiesandtrafficlifetime 137
4.4.7 TypesofHMPDUs 139
4.4.8 Look-upfunction:LR-HMPDUandLC-HMPDU 139
4.4.9 IP-HMPDUandGP-HMPDU 140
4.4.10 DT-HMPDU 140
4.4.11 TC-HMPDUandHO-HMPDU 141
4.4.12 Routingfunctionsandinformationmaintenance 142
4.5 ConclusionsonHIPERLANtype1 146
4.6 FutureBRANstandards 147
References 148
Selected Bibliography 149
ApplicationScenarios 151
5.1 Introduction 151