ericssonhistory.com

More documents

Recommendations

Info

HIPERLAN type 2 for broadband wirelesscommunicationJamshid Khun-Jush, Goran Malmgren, Peter Schramm and Johan TorsnerThe aim of several standardization efforts, including GPRS, EDGE, andUMTS, is to meet the requirements being put on wireless data communication.These standards are for wide-area wireless data services with fullmobility up to 2 Mbit/s. In addition, standards are being developed inEurope, Japan, and the US for wireless local area network multimediacommunication in the 5 GHz band.HIPERLAN/2, which is being specified by the ETSI BRAN project, willprovide data rates of up to 54 Mbit/s for short-range (up to 150 m) communicationsin indoor and outdoor environments. Almost total harmonizationwas achieved between the standardization bodies in Europe (ETSI)and Japan (ARIB) when the core parts of the specification were finalizedin 1999.In this article, the authors present an overview of the HIPERLAN/2 standardand results of link and system performance.IntroductionThe key drivers of demand for radio-basedbroadband access networks are massivegrowth in wireless and mobile communications,the emetgence of multimedia applications,demands for high-speed Internet access,and the deregulation of the telecommunicationsindustry. Present-day wirelesstelecommunications networks, which areprimarily narrowband, are mostly used forcircuit-switched voice services. The evolutionof second-generation and the developmentof third-generation mobile wirelesssystems aim to enable networks to provideinstantaneous user bit rates of up to 2 Mbit/sper radio channel. This capacity will significantlyimprove packet-data and mobilemultimedia applications. In addition, evenFigure 1Current spectrum allocation of HIPERLAN/2 at 5 GHz. In Europe, a 455 MHz bandwidthhas been allocated (license-exempt band); in Japan, 100 MHz (with sharing rules); and inthe US, 300 MHz (U-NII band).higher data rates can be obtained for localarea networks using novel short-range wirelesstechnologies. Bandwidth-hungry, realtimeand interactive multimedia services,such as high-quality video distribution,client/server applications, and data-bank access,are typical applications for this technology.Therefore, new wireless networkswith broadband capabilities are beingsought to provide high-speed integratedservices (data, voice, and video) with costeffectivesupport for quality of service (QoS).Considerable research and standardizationefforts have been expended to devise appropriatetransmission and networkingtechnologies. The Internet EngineeringTask Force (IETF), the InternationalTelecommunication Union (ITU) and theATM Forum are defining the fixed core network.Similarly, the Broadband Radio AccessNetworks (BRAN) project of the EuropeanTelecommunications Standards Institute(ETSI) is working on standards for differentkinds of wireless broadband accessnetwork. One of these standards, called highperformanceradio local-area network, type 2(HIPERLAN/2) will provide high-speedcommunications access to different broadbandcore networks and moving terminals(portable as well as mobile). 1 ' 9 In Japan, asystem that is very similar to HIPERLAN/2has also been specified. The main differencebetween it and HIPERLAN/2 is that thespectrum-sharing rule of the Japanese systemintroduces a carrier-sensing mechanism.Before beginning standardization workon HIPERLAN/2, ETSI had developed theHIPERLAN/1 standard for ad hoc networkingof portable devices. This standard mainlysupports asynchronous data transfer andapplies a multiple access mechanism—fromthe carrier-sense multiple access (CSMA)family—with collision avoidance (CA).Using the CSMA/CA technique for resolvingcontention, the scheme shares availableradio capacity between active users who attemptto transmit data during an overlappingtime span. Although HIPERLAN/1provides a means of transporting timeboundedservices, it does not control orguarantee QoS on the wireless link. It is thusconsidered a system for best-effort deliveryof data. This is what motivated ETSI to developa new generation of standards thatsupport asynchronous data and timecriticalservices (for example, packetizedvoice and video) that are bounded by specifictime delays.108 Ericsson Review No. 2, 2000
MobilityVehicleWalkFixedData rate[Mbit/s]Figure 2Mobility and data rates for communicationsstandards.While ETSI was working on the HIPER-LAN/2 standard, the Institute of Electricaland Electronic Engineers (IEEE) beganspecifying a physical layer for the UnliBOX A, ABBREVIATIONScensed National Information Infrastructure(U-NII) band, to extend its IEEE 802.11standard for high-speed applications. TheIEEE 802.11a reuses the medium accesscontrol (MAC) protocol already specified forthe Industrial Scientific Medical (ISM) band(2.4GHz).In contrast to HIPERLAN/2, thescope of the IEEE 802.11—as a mandatoryoperation mode—mainly applies to asynchronousdata applications.In Japan, the Multimedia Mobile AccessCommunications (MMAC) promotion associationwithin the Association of Radio Industriesand Broadcasting (ARIB) hadbegun developing various high-speed radioaccesssystems for business and home applicationsat 5 GHz. One such system, for businessapplications in corporate and publicnetworks, has been aligned with HIPERLAN/2.The HIPERLAN/2 standard is a complementto present-day wireless access systems,giving high data rates (capacity andthroughput) to end-users in hot-spot areas.Compared to other cellular systems, the outdoormobility of HIPERLAN/2 is limited.Typical application environments are offices,homes, exhibition halls, airports, trainstations, and so on (Figure 2). In these environments,HIPERLAN/2 offers wireless16QAM64QAMACHAPARIBARQATMBCHBPSKBRANCAC/lCLCMCSMADFSDLCDMECEDGEEIRPETSIFCHFECGPRSH2GFHIPERLAN/216-ary quadrature amplitudemodulation64-ary quadrature amplitudemodulationAccess feedback channelAccess pointAssociation of Radio Industriesand BroadcastingAutomatic repeat requestAsynchronous transfer modeBroadcast channelBinary phase-shift keyingBroadband Radio AccessNetworksCollision avoidanceCarrier-to-interferenceConvergence layerCentralized modeCarrier-sense multiple accessDynamic frequency selectionData link controlDirect modeError controlEnhanced data rates for globalevolutionEffective isotropic radiatedpowerEuropean TelecommunicationsStandards InstituteFrame channelForward error controlGeneral packet radio serviceHIPERLAN/2 Global ForumHigh-performance radiolocal-area network, type 2IEEEIETFIFFTIPISMITULCHMACMMACMTOFDMPDUPHYPPPQoSQPSKRCHRLCRRCSCHSDUSRSSCSTDDTDMAUMTSU-NIIInstitute of Electrical andElectronic EngineersInternet Engineering Task ForceInverse fast Fourier transformInternet protocolIndustrial Scientific Medical(2.4 GHz frequency band)InternationalTelecommunication UnionLong transport channelMedium access controlMultimedia Mobile AccessCommunicationsMobile terminalOrthogonal frequency-divisionmultiplexingProtocol data unitPhysical (layer)Point-to-point protocolQuality of serviceQuaternary phase-shift keyingRandom access channelRadio link controlRadio resource controlShort transport channelService data unitSelective repeatService-specific convergencesublayerTime-division duplexTime-division multiple accessUniversal mobiletelecommunications systemUnlicensed National InformationInfrastructureEricsson Review No. 2, 2000 109
Page 1:
Ericsson 2/2000REVIEWTHE TELECOMMUN
Page 4 and 5:
ContributorsIn this issueLuis Barri
Page 6 and 7:
Ericsson Review is also published o
Page 8 and 9: Evolving from cdmaOne to third-gene
Page 10 and 11: Figure 2Operators Harmonization Agr
Page 12 and 13: more features, and greater reliabil
Page 14 and 15: Figure 7Ericsson's third-generation
Page 16 and 17: Figure 11Ericsson's timeline for ev
Page 18 and 19: Third-generation TDMAChristofer Lin
Page 20 and 21: TABLE 1 MODULATION AND CODING SCHEM
Page 22 and 23: Figure 3An example of a cell patter
Page 24 and 25: Figure 5Curves illustrating maximum
Page 26 and 27: TABLE 3. DYNAMIC PACKET DATA SIMULA
Page 28 and 29: erage can be achieved in existing c
Page 30 and 31: Business solutions for mobile e-com
Page 32 and 33: Figure 2Comparison of traditional a
Page 34 and 35: BOX B, THE E-COMMERCE TIMELINE1999E
Page 36 and 37: Figure 6Mobile e-Pay end-user servi
Page 38 and 39: Figure 8Access features with push-a
Page 40 and 41: AuthenticationTo verify that end-us
Page 42 and 43: BOX C, MARKET HARMONIZATIONOn Tuesd
Page 44 and 45: Figure 2The footprint of the RBS 22
Page 46 and 47: Communications security in an all-I
Page 48 and 49: BOX B, SYMMETRIC KEY SYSTEMSGood sy
Page 50 and 51: Figure 4Construction of an ESP-prot
Page 52 and 53: Figure 7An X.500 database structure
Page 54 and 55: Figure 9GPRS VPN scenarios.Figure 1
Page 56 and 57: TRADEMARKSRC4 and RC4 are registere
Page 60 and 61: Figure 3Typical usage of communicat
Page 62 and 63: Figure 6Mapping of higher layer pac
Page 64 and 65: TABLE 1PHYSICAL LAYER MODES OF HIPE
Page 66 and 67: Queen City WaterfrontEMERGING PROJE
Page 68 and 69: TABLE 2. IMPORTANT PARAMETERS FOR N
Page 70: Previous issuesNo. 1,2000IPv6—The
show all

ericssonhistory.com

Create successful ePaper yourself

Delete template?

Save as template?