LTE DownLink Frame Structure - Copy.pptx
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This document discusses the overall EPS architecture and air interface capabilities in LTE such as OFDMA and SC-FDMA based radio access. It describes aspects of the downlink physical resource such as synchronization signals, reference signals, control channels, and shared data channels. Additionally, it provides examples of downlink transmissions and scheduling principles as well as HARQ operations in the channel access design of LTE.
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- 10. OFDMAresource allocation in LTE
- 11. Resource mapping in SC-FDMA
- 12. Channel mapping
- 13. Channel mapping
- 17. The LTE downlink physical resource
- 19. TDD Uplink Downlink Configurations
- 20. Synchronization Signals (PSS & SSS)
- 21. P-SS(Primary Synchronization Signal) • Mapped to 72 active sub carriers(6 resource blocks), centered around the DC subcarrier in slot 0 (Sub frame 0) and slot 10 (Sub frame 5). Made up of 62 Zadoff Chu Sequence Values Used for Downlink Frame Synchronization One of the critical factors determining Physical Cell ID
- 22. S-SS(Secondary Synchronization Signal) • Mapped to 72 active sub carriers(6 resource blocks), centered around the DC subcarrier in slot 0 (Sub frame 0) and slot 10 (Sub frame 5) in FDD. The sequence of SSS in sub frame 0 and the one in sub frame 5 are different from each other Made up of 62 Scrambling Sequence (based on m-sequence) The value in odd indexed resource element and the one in even indexed resource elements is generated by different equation Used for Downlink Frame Synchronization
- 23. Physical Cell ID • Physical Cell ID is an identification of a cell at physical layer. It has similar role as Primary Scrambling Code of UMTS • cell.
- 24. Physical Broadcast Channel (PBCH)
- 25. PBCH(Physical Broadcast Channel) • It carries only the MIB. • It is using QPSK. • Mapped to 6 Resource Blocks (72 subcarriers), centered around DC subcarrier in sub frame 0. • Mapped to Resource Elements which is not reserved for transmission of reference signals, PDCCH or PHICH
- 26. Physical Control Format Indicator Channel (PCFICH) •It carries the number of symbols that can be used for control channels (PDCCH and PHICH). •Mapped to the first OFDM symbol in each of the downlink sub-frame. This contains the information on number of OFDM symbols carrying the control channels (PDCCH and PHICH). UE decode this channel to figure out how many OFDM symbols are assigned for the control channels(PDCCH and PHICH) •It is 16 data subcarriers of the first OFDM symbol of the sub frame. •PCFICH data is carried by 4 REGs and these four REGs are evenly distributed across the whole band regardless of the bandwidth. •The exact position of PCFICH is determined by cell ID and bandwidth.
- 27. Physical Downlink Control Channel (PDCCH) Mapped to the first L OFDM symbols in each of the downlink sub-frame. Number of the symbols (L) for PDCCH can be 1,2, or 3. Number of the symbols for PDCCH is specified by PCFICH PDCCH carries DCIs and the DCI carries Transport format, resource allocation, H-ARQ information related to DL-SCH, UL-SCH and PCH and other additional information depending on DCI format. PDCCH also carries DCI 0 which is for UL Scheduling assignment (e.g, UL Grants). Multiple PDCCH can be assigned in single sub frame and a UE do blind decoding of all the PDCCHs. Modulation Scheme is QPSK
- 28. Physical HARQ Indicator Channel (PHICH) PHICH stands for Physical channel Hybrid ARQ Indicator Channel. Simply put, it is a specially designed downlink only channel which carries ACK or NACK for the PUSCH received by the network. Uplink case they just used PUCCH for carrying ACK/NACK for each PDSCH it received. Why don't we use PDCCH for ACK/NACK on network side. PHICH is carried by the first symbol of each sub frame. (It is located in the same symbol as PCFICH). One PHICH is carried by multiple REG. Multiple PHICH can be carried by the same set of REG and these multiple PHICH being carried by the same REGs are called PHICH group.
- 29. Physical Downlink Shared Channel (PDSCH) • Carries user specific data (DL Payload). Carries Random Access Response Message. It is using AMC with QPSK, 16 QAM, 64 QAM, 256 QAM modulation scheme (This modulation scheme is determined by MCS that is carried by DCI)
- 30. DL Reference Signals: 1 TxAntenna
- 31. DL Reference Signals: 2 TxAntenna
- 32. DL Reference Signals: 4 TxAntenna
- 33. Downlink Transmission –An Example Example
- 35. Channel DL Scheduled Operation Overview IP
- 41. Great Thanks