LTE PHY Overview - Drexel University College Of Engineering
LTE PHY OverviewGwanmo KuAdaptive Signal Processing and Information Theory Research GroupNov. 4, 2011
Outline2/25LTE IntroductionLTE PHY Standard DescriptionsProtocol ArchitectureStandard Docs.ParametersFrame StructuresPHY ResourcesModulation, Channel Coding, and Physical ChannelsReferences
2/11LTE Introduction
Why LTE?4/25Continuity ofCompetitivenessof 3G SystemHigher Data RateQoSPacket SwitchOptimized SystemLTEHigh Spectral EfficiencyVery Low LatencySupport of Variable Bandwidth(Reference: http://www.3gpp.org/LTE)
LTE Multiple Access5/25Base Station(eNB)DL : OFDMA with CPUL : DFTS-OFDMA with CPMobile(UE)DL (Downlink), UL (Uplink), CP (Cyclic Prefix)eNB (e Node B), UE (User Equipment)DFTS-OFDMA (DFT Spread OFDMA) : also called as SC-FDMA (Single Carrier FDMA)(Reference : p7, 3GPP TS 36.201 V8.3.0 (2009-03))
OFDMA & SC-FDMA7/25OFDMABitsConstellation Mapping&S/Pπ΅π - DFTSubcarrierMappingπ΅ - IFFTAdd CP&P/SDFT Spread SC-FDMA (DFT Spread OFDMA)S/P (Serial to Parallel Conversion), P/S (Parallel to Serial Conversion)π΅π : Used Subcarriersπ΅ : Total Subcarriers(Reference : p. 71, 3GPP TR 25.814 V7.1.0 (2006-09))
2/11LTE PHY Standard Descriptions
LTE Protocol Architecture9/25 LTE Protocol Architecture around PHYLayer 3Radio Resource Control (RRC)Logical ChannelsLayer 2Medium Access Control (MAC)Control /MeasurementsTransport ChannelsLayer 1Physical Layer (PHY)Logical Channels : Type of information transferredTransport Channels : How the information is transferred(Reference : p. 7, 3GPP TS 36.201 V8.3.0 (2009-03))
LTE PHY Standard Docs.10/25Rel-8 36 Series : LTERequirementsRel-9 36 Series : LTE with EnhancementRel-10, 11, 36 Series : LTE AdvancedRel-8 362XX : LTE PHY Technical Spec.36201 : LTE PHY General DescriptionsLayer 136211 : Physical channels and modulation36.212 : Multiplexing and channel coding36.213 : Physical layer proceduresLayer 2 & 336.214 : Physical layer Measurements
PHY Parameters11/25DL/UL ParametersSystem BW [MHz]1.435101520# Resource Blocks π΅πΉπ©615255075100 π πππ²π―π2048FFT Size π΅ π π. ππ²π―π- π πππ²π―π4096*12# Subcarriers per RB π΅ππ π π. ππ²π―π π πππ²π―π7218030024*6009001200# Used Subcarriers π΅π π π. ππ²π―πSampling Rate [MHz]1.923.847.682400*15.3623.0430.72Subcarrier Spacing π 15 ππ»π§ UL/DL, π 7.5 ππ»π§ DL only(Reference : 3GPP TS 36.101 V8.15.0 (2011-09))
PHY Parameters β CP Length12/25One Slot0.5 ms (500 πs)DL/UL Normal CP5.2083 ππ04.6875 ππSymbol 01Symbol 12Symbol 23Symbol 34Symbol 45Symbol 56Symbol 6CP5Symbol 566.6667 ππDL/UL Extended CP with Freq. Spacing 15 KHz66.6667 ππcp0Symbol 0CP1Symbol 1CP2Symbol 2CP3Symbol 3CP4Symbol 416.6666 ππDL Extended CP with Freq. Spacing 7.5 KHz133.33 ππcp0Symbol 0CP1Symbol 1CP2Symbol 233.333 ππ(Reference : 3GPP TS 36.211 V8.9.0 (2009-12))
Operating Bands (700 MHz)13/25FDD UplinkFDD DownlinkTDDLTE Recommendation700MHz699716Band 12704729746Band 12800750756758Band 13768Band 14777787Band 13788798Band 14716Band 17Band 17757C776CVerizon LTE Plan in USFCC Upper 700 MHz Band CFCC Band in USReferences : [1] 3GPP TS 36.101 V8.15.0 (2011-09)[2] FCC Doc. : http://transition.fcc.gov/Daily Releases/Daily Business/2011/db0630/FCC-11-103A1.pdf
Operating Bands (800 MHz)14/25FDD UplinkFDD DownlinkTDDLTE Recommendation800MHz850824849869900750Band 5830950894960Band 5840875Band 6885Band 6880915Band 8Cellular925Band 8CellularFCC Cellular BandBut unavailable for LTEReferences : [1] 3GPP TS 36.101 V8.15.0 (2011-09)[2] FCC Doc. : http://transition.fcc.gov/Daily Releases/Daily Business/2011/db0630/FCC-11-103A1.pdf
Operating Bands (1700-2200 MHz)15/25FDD UplinkFDD DownlinkTDDLTE Recommendation1700MHz180017101785Band 31900180520001880Band 317701920Band 391850Band 101910Band 351980Band 11930Band 372010Band 3421002025220021102170Band 11990Band 361755Band 102155Band 4Band 21749.91784.9Band 91844.9Band 2Band 41879.9Band 9Band33FCCPCS Broadband andAdvanced Wireless Services (AWS)AWS1PCS BroadbandPCS BroadbandAWS1AT&T LTE Plan : AWS bandReferences : [1] 3GPP TS 36.101 V8.15.0 (2011-09)[2] FCC Doc. : http://transition.fcc.gov/Daily Releases/Daily Business/2011/db0630/FCC-11-103A1.pdf
Operating Bands (1400 & 2300-2700 MHz)16/25FDD Uplink1400MHz1500FDD DownlinkTDD230024002500LTE Recommendation260027001427.9 1447.9 1475.9 1495.9Band112570Band11Band 40Band 72620Band382690Band 7FCCBroadband Radio Service (BRS) andEducational Broadband Service (EBS)BRSEBSBRS EBS250226022673.52690ButLTE availableBW upto 5MHzReferences : [1] 3GPP TS 36.101 V8.15.0 (2011-09)[2] FCC Doc. : http://transition.fcc.gov/Daily Releases/Daily Business/2011/db0630/FCC-11-103A1.pdf
Frame Structure17/25Frame Structure Type 1 : FDDFrame Structure Type 2 : TDD5msSwitch10msSwitch(Reference : 3GPP TS 36.211 V8.9.0 (2009-12))
Frame Structure β TDD (Cont.)18/25UL/DL ConfigurationsSub-frame NumberUL-DLConfigurationDL to ULSwitch PointPeriodicity012345678905 msDSUUUDSUUU15 msDSUUDDSUUD25 msDSUDDDSUDD310 msDSUUUDDDDD410 msDSUUDDDDDD510 msDSUDDDDDDD65 msDSUUUDSUUDSubframe Index : D (Downlink), U (Uplink), S (Special)(Reference : 3GPP TS 36.211 V8.9.0 (2009-12))
PHY Resources19/25 Resources in LTE Resources : # Usable Subcarriers Resource Block & SlotFrequency0.5 msSlot TimeResourcce BlockBW180 kHztime(Reference : 3GPP TS 36.211 V8.9.0 (2009-12))
PHY Resources β UL Slot οΏ½οΏ½πππππΏπ π΅ππ π΅ ππ π SC-FDMA Symbolsπ π΅ππ πBW οΏ½οΏ½ππ΅πΌπ³ππππNormal CP127Extended CP126ConfigurationCP Length160 for 0th SymbolNormal CP144 for 1 6th Symbol Extended CP512 for 0 5th SymbolNullitiestime1 Slot(Reference : 3GPP TS 36.211 V8.9.0 (2009-12))
PHY Resources β DL Slot οΏ½οΏ½ππ OFDMA SymbolsBW οΏ½π³ππππ π 15 ππ»π§127 π 15 ππ»π§126 π 7.5 ππ»π§243ConfigurationNormal CPππ·πΏππ π΅ π π΅ππ ππ π΅ππ πExtended CPConfigurationNormal CP π 15 ππ»π§CP Length160 for 0th Symbol144 for 1 6th Symbol Extended CP π 15 ππ»π§512 for 0 5th Symbol π 7.5 ππ»π§1024 for 0-2nd SymbolNullitiestime1 Slot(Reference : 3GPP TS 36.211 V8.9.0 (2009-12))
Modulations, Coding, Physical Channels22/25 Modulations QPSK, 16QAM, 64QAM Channel Coding Turbo Coding Physical Channels DL Physical ChannelsPDSCH, PDCCH, PCFICH, PBCH, PMCH, PHICH UL Physical ChannelsPUSCH, PUCCH, PRACH(Reference : 3GPP TS 36.212 V8.8.0 (2009-12))
Future Work (Next Talk)23/25LTEResource AllocationAMC(Adaptive Modulation and Coding)
2/11References
References25/25 LTE related Webpages http://www.3gpp.org: 3GPP Standard Web http://www.fcc.gov/: FCC http://wireless.fcc.gov/uls/: FCC Band License Search LTE Standard Docs. β Release 8 Technical Specs. http://www.3gpp.org/ftp/Specs/latest/Rel-8/36 series/ FCC Useful Doc. β 15th Report http://transition.fcc.gov/Daily Releases/Daily Business/2011/db0630/FCC-11-103A1.pdf DFTS-OFDMA (SC-FDMA) http://sites.google.com/site/hgmyung/scfdma
Rel-8 36 Series : LTE Rel-9 36 Series : LTE with Enhancement Rel-10, 11, 36 Series : LTE Advanced Rel-8 362XX : LTE PHY Technical Spec. 36201 : LTE PHY General Descriptions 36211 : Physical channels and modulation 36.212 : Multiplexing and channel coding 36.213 : Physical layer procedures 36.214 : Physical layer Measurements Layer 1 Layer 2 & 3
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