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Samsung LTE 物理层 协议 培训资料.pdf

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    LTE PHY Spec.
    Contents
    Downlink structure
    Frame Structure
    Frame Structure
    Downlink
    Resource Grid
    Resource Grid
    Resource Grid
    Resource Element Groups
    Initial Access
    Initial Access
    Cell search
    Synchronization signals -FDD
    Synchronization signals -TDD
    Primary synchronization signal (PSS)
    Secondary synchronization signal (SSS)
    Downlink Reference Signal (RS)
    Mapping of Cell-specific Reference Signal
    Cell-specific RS
    Dedicated RS
    System Information Receive
    PBCH
    PBCH
    PBCH
    PCFICH
    PDCCH
    PDCCH
    PDCCH
    PDCCH
    PDCCH
    PDCCH
    PDCCH
    Downlink data transmission
    PHICH
    PHICH
    PHICH
    PHICH
    DL Physical Channel Processing
    Scrambling
    PDSCH
    MBSFN
    MBSFN Sub-frame Structure
    MBSFN RS and PMCH
    PCFICH and PMCH in MBSFN
    Uplink structure
    Uplink Overview - Uplink Structure
    Uplink Overview - Uplink Physical Channels
    Uplink Overview - Uplink Signals
    PUSCH Processing
    PUSCH Processing
    PUSCH Hopping
    PUSCH Hopping
    PUSCH Hopping
    PUSCH Hopping
    PUCCH Format
    PUCCH Format 1a and 1b (For ACK/NACK Only Case)
    Orthogonal Sequence for PUCCH
    ACK/NACK Channelization
    ACK/NACK Channelization
    CS Hopping and CS/OC Re-mapping
    PUCCH Format 2
    PUCCH Format 2a and 2b (ACK/NACK and CQI from a UE)
    PUCCH Format 1 (Scheduling Request Only)
    Mapping PUCCH to Physical Resources
    Multiplexing of Control and Data on PUSCH
    PUCCH Interaction with SRS for a UE
    DM RS for PUSCH
    Sounding Reference Signal (SRS) Subframe Configuration
    SRS Bandwidth Configuration (1)
    SRS Bandwidth Configuration (2)
    SRS Generation
    SRS Hopping Pattern
    PRACH Structure
    PRACH Configuration
    PRACH Sequence (1)
    PRACH Sequence (2)
    LTE PHY Spec. Samsung Electronics June 24, 2008
    Contents • Downlink Spec. – Downlink Structure: FDD, TDD – Initial Access • Cell Search (PSC, SSC, RS) • System Information Receive (PBCH, PCFICH, PDCCH) • Random Access – Downlink data transmission: PHICH, PDSCH • Uplink Spec. – Uplink Structure • Uplink slot structure • Uplink physical channels and signals – Physical uplink shared channel (PUSCH) – Physical uplink control channel (PUCCH) – Reference signal (RS) – Physical random access channel (PRACH) 1111
    LTE L1 Specification Downlink structure 22
    Frame Structure • Frame structure – Frame structure type 1 • Applicable to FDD and half duplex FDD • Each radio frame is T f T × s 307200 = ms 5.0 = length 15360 T slot T s = × = ms 10 long and consists of 20 slots of , numbered from 0 to 19( seconds) ( 15000 =T s 2048 × 1 ) One radio frame, Tf = 307200×Ts=10 ms One slot, Tslot = 15360×Ts = 0.5 ms #0 #1 #2 #3 #18 #19 One subframe – Frame structure type 2 • Applicable to only TDD • Each radio frame consists of two half frame length 153600 = and each half frame consists of 8 slots of length T 15360 s = T f T = slot T = × s ms 5.0 ms 5 each and 33
    Frame Structure – Frame structure type 2(Cont.) • Three special fields, DwPTS, GP, and UpPTS in subframe #1 and #6 • Subframes 0 and 5 and DwPTS are always reserved for downlink transmission • The lengths of DwPTS and UpPTS is given below subject to the total length of DwPTS, GP and UpPTS being equal to ms 1 • Supported configurations of uplink-downlink subframe allocation are specified 0720 3 s =T Lengths of DwPTS/GP/UpPTS Lengths of DwPTS/GP/UpPTS Uplink--downlink allocations downlink allocations Uplink
    Downlink • Physical channels – A set of Resource Elements carrying information originating from higher layers • Physical Downlink Shared Channel, PDSCH • Physical Broadcast Channel, PBCH • Physical Multicast Channel, PMCH • Physical Control Format Indicator Channel, PCFICH • Physical Downlink Control Channel, PDCCH • Physical Hybrid ARQ Indicator Channel, PHICH • Physical signals – A set of Resource Elements NOT carrying information originating from higher layers • Reference signal • Synchronization signal 55
    • The transmitted signal in each slot is described by a resource grid of DL RB NN RB sc subcarriers and OFDM symbols. Resource Grid DL symbN 10ms radio frame, Tf Subframe #0 1msec #1 #2 #3 #4 #5 #6 #7 #8 #9 Slot, Tslot #0 0.5 msec #1 Resource Block (RB) l=0 Symbol Subcarrier 15kHz Resource element (k,l) [The resource grid structure] 66 *NSC RB k = nPRB DL-1 l=Nsymb
    Resource Grid • Physical resource block parameters – Number of symbols per slot Configuration Normal CP (15kHz) Extended CP 15kHz 7.5kHz RB size (number of sub- carriers) Number of symbols per slot 12 24 7 6 3 – Number of RBs per Channel bandwidth [Ref. TS 36.104] Channel bandwidth BWChannel [MHz] FDD mode 1.4 6 3 15 5 25 10 50 15 75 20 100 77
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