无线通信网络基本概念及设计

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1、WHITEPAPERIntroductiontowirelessnetworks1.PrefaceThiswhitepaperraisessomefundamentalissuesthedesignengineershouldaddressbeforedecidinguponacommunicationapproachforawirelessnetwork.Asnouniversalwirelessnetworksolutionexists,itshouldbecustomtailoredtosuittheapplicationdemands.Defin

2、ingyourapplicationcommunicationcharacteristicsisthekeytoensureoptimalcommunicationreliabilityandresistancetointerferingnoisesources.2.ThenetworkconceptInmultiplenodeapplicationswhereoneorseveralnodesneedtobeabletocommunicatewithall,orasubsetoftheothernodesinthesystem,someformofne

3、tworkapproachisneeded.Ageneraldefinitionofanetworkis:"Anyarrangementofelementsthatareinterconnected"Thefundamentalpurposeofthenetworkrealizationissimplyprovidingadefinedprocedureofinterconnectionandinformationflowbetweennodes.Secondaryissuesareensuringthenecessarycommunicationrel

4、iabilityinordertoobtainsatisfactoryapplicationfunctionality.Typicalnetworkscenariosare:eng·ThenodesinasystemarescatteredtosuchadioraRN3anextentthatthenodesarenotwithinradiorangeofalltheothernodesintheeRadiorngsystem.ioraRad1NN3Nange2Example:Consideranindustrialsensoregnaapplicati

5、onwherethenodesarepositionedatrN1N2io4dNavariouslocationsinalargebuilding.AllRsensornodesreportstatustothemasterN4controlnodeatpredestinedtimeintervals,orifthemeasuredvalueexceedsgivenalarmthresholds.Ifasensornodeisoutsideradiorangeofthemastercontrolnode,theinformationmustbeFigur

6、e1-Nonoverlappingradiorangesrelayedtothemastercontrolnodebymeansofnetworking.Thisisachievedbyothersensornodeslocatedbetweenthetwonodesretransmittingpackagesnotaddressedtothemselves.NordicSemiconductorASA-VestreRosten81,N-7075Tiller,Norway-Phone+4772898900-Fax+4772898989Page1of16S

7、eptember2004WHITEPAPERIntroductiontowirelessnetworksRa·SystemswheretheinherentmobilityofngeRadiorangedioraioraN2N3ngenodes,transfernodesinandoutofradioRad1Nrangeofothernodesinthesystem.Example:ConsiderasystemconsistingofN1N2N3nodesattachedtomobilepersonnelworkingatalocationlarger

8、thantheradiorange.Inordertoexchangeinfor