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AgendaAgenda!! What is What is WiMaxWiMax??!! Deployment Vision, Roadmap, SpectrumDeployment Vision, Roadmap, Spectrum!! End to end architectureEnd to end architecture!! Relationship to 3G evolution and “4G”Relationship to 3G evolution and “4G”
What is WiMaxWhat is WiMax!! WiMaxWiMax is IEEE WWAN technology (802.16)is IEEE WWAN technology (802.16)!! 802.16802.16--2004: Fixed access BB access2004: Fixed access BB access!! 802.16e: Mobile BB access802.16e: Mobile BB access
!! Initially nomadic usageInitially nomadic usage!! Ultimately mobile usageUltimately mobile usage
!! 3G adjunct or competitor?3G adjunct or competitor?!! Optimized for data not voiceOptimized for data not voice!! Some technical advantages for data Some technical advantages for data vsvs 3G3G
!! Licensed and unlicensed rolesLicensed and unlicensed roles!! WiMaxWiMax Forum is the industry groupForum is the industry group
!! Subcarrier allocation: wider BW allocation range than variable rSubcarrier allocation: wider BW allocation range than variable rate CDMAate CDMA!! Supports higher peak data rate for bursty users (flexible allocaSupports higher peak data rate for bursty users (flexible allocation per user)tion per user)!! Supports wider variation of spectrum bandwidths (HSDPA limited tSupports wider variation of spectrum bandwidths (HSDPA limited to 5 MHz)o 5 MHz)
!! Symmetric downlink/uplink Symmetric downlink/uplink !! HSDPA only for downlink; uplink counterpart HSUPA yet to be deveHSDPA only for downlink; uplink counterpart HSUPA yet to be developedloped!! DL/UL ratio is fixed in WCDMA/HSDPA; dynamically configurable inDL/UL ratio is fixed in WCDMA/HSDPA; dynamically configurable in WiMAXWiMAX
!! Spectrum efficiencySpectrum efficiency!! Subcarrier allocation takes advantage of multiSubcarrier allocation takes advantage of multi--user frequency selectivityuser frequency selectivity!! PerPer--subcarriersubcarrier adaptive coding/modulation achieves better efficiencyadaptive coding/modulation achieves better efficiency
!! MIMO friendlyMIMO friendly!! Supports adaptive antenna enhancements in frequency selective chSupports adaptive antenna enhancements in frequency selective channel annel
(beam forming, space time coding, spatial multiplexing and SDMA)(beam forming, space time coding, spatial multiplexing and SDMA)!! MIMO for WCDMA requires complex preMIMO for WCDMA requires complex pre--processing for similar gainsprocessing for similar gains
!! Reduced uplink nearReduced uplink near--far problemfar problem!! Orthogonal subcarrier uplink allocation relaxes need for tight pOrthogonal subcarrier uplink allocation relaxes need for tight power control ower control
(HSDPA must have fast power(HSDPA must have fast power--control to avoid the nearcontrol to avoid the near--far problem)far problem)
Portability and MobilityPortability and Mobility!! Portable Service ‘Extended WiFi’ Usage ModelPortable Service ‘Extended WiFi’ Usage Model
!! Predominately notebook PC clients and PDA devicesPredominately notebook PC clients and PDA devices!! Nomadic usage Nomadic usage –– Stationary access Stationary access
!! reconnect, authenticate at each locationreconnect, authenticate at each location!! Portable usage Portable usage –– Nomadic service plus limited L3 mobilityNomadic service plus limited L3 mobility
!! pedestrian movement, latency tolerant handoffpedestrian movement, latency tolerant handoff!! Mobility: Best effort Mobility: Best effort QoSQoS / handoff moving from BS to BS/ handoff moving from BS to BS
!! Mobility Service ‘Enhanced 3G data’ usage modelMobility Service ‘Enhanced 3G data’ usage model!! PC, PDA plus voice/data handhelds, vehicular PC, PDA plus voice/data handhelds, vehicular telematicstelematics!! Full mobile usage: portable model plusFull mobile usage: portable model plus
!! Real time handoff during BS/BS transitionsReal time handoff during BS/BS transitions!! Continuity of sessions and realContinuity of sessions and real--time applicationstime applications!! Support for vehicular data access while movingSupport for vehicular data access while moving
!! 2.5GHz, 3.5Ghz depending upon national rules2.5GHz, 3.5Ghz depending upon national rules!! possible sub 1GHz, possible IMTpossible sub 1GHz, possible IMT--20002000
End-end ArchitectureEnd-end Architecture!! 802.16 Focus is 802.16 Focus is PhyPhy/MAC/MAC!! MINA group started to define architectureMINA group started to define architecture!! Work moved into Work moved into WiMaxWiMax ForumForum!! 3GPP for harmonization discussions ahead3GPP for harmonization discussions ahead
Relationship to 3G+ TrendsRelationship to 3G+ Trends!! Interest in OFDM addInterest in OFDM add--on to 3Gon to 3G
!! E.g., DoCoMo Super 3G proposalsE.g., DoCoMo Super 3G proposals
!! Interest in IP Infrastructure (all IP net)Interest in IP Infrastructure (all IP net)!! Data services inherently packet orientedData services inherently packet oriented
!! Better Packet handlingBetter Packet handling!! More flexible radio More flexible radio phyphy
!! Variety of bands and evolving modulationsVariety of bands and evolving modulations
!! Applications and devices that utilize network servicesApplications and devices that utilize network services!! Power management for extended battery lifePower management for extended battery life
!! Radio PerformanceRadio Performance!! Improvement in spectral efficiency for data services vs. 3GImprovement in spectral efficiency for data services vs. 3G!! Comparable or better indoor penetration vs. 3GComparable or better indoor penetration vs. 3G!! Complementary range and coverage to Complementary range and coverage to WiFiWiFi
!! Flexible NetworksFlexible Networks!! Fully interoperable IP based network elementsFully interoperable IP based network elements!! RAN architectures that support multiRAN architectures that support multi--operator interestsoperator interests
!! Greenfield operatorsGreenfield operators!! DSL/Cable wireline operatorsDSL/Cable wireline operators!! 2G/3G mobile operators2G/3G mobile operators
!! RAN architecture independence from operator IP core networksRAN architecture independence from operator IP core networks!! Overall SystemOverall System
!! Wide area wireless network that meets market cost modelsWide area wireless network that meets market cost models!! CapExCapEx: Infrastructure and client costs, spectrum licenses: Infrastructure and client costs, spectrum licenses!! OpExOpEx: Spectrum efficiency, client management and support: Spectrum efficiency, client management and support