LTE Merging Technologies by TI

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Contents
1. Definitions, symbols and abbreviations . 5
1.1 Definitions ... 5
1.2 Abbreviations ......... 5
1.3 Symbols ...... 6
2. Introduction ........ 7
2.1 Generalities. 7
2.2 4G at 3GPP. 9
2.2.1 Introduction – first phase.......... 9
2.2.2 Introduction – second phase.. 10
2.2.3 LTE objective and requirements ...... 10
2.2.4 Requirements for E-UTRAN architecture and migration ......... 17
2.2.5 Radio resource management requirements... 17
2.2.6 Complexity requirements ....... 17
2.2.7 General requirements . 18
3. LTE Layer 1 general description.......... 19
3.1 General protocol architecture........ 19
3.2 Multiband operation. 19
3.3 Bandwidth considerations .. 20
3.4 Layer 1 FDD/TDD numerology...... 20
3.5 FDD frame structure (frame structure type 1) ....... 20
3.6 TDD frame structure (frame structure type 2) ....... 21
3.7 Timing ....... 22
3.8 Downlink slot structure....... 22
3.9 OFDM symbol structure – resource grid . 24
3.10 Uplink slot structure. 25
3.11 Resource grid....... 26
3.12 SC-FDMA symbol structure .......... 27
4. Downlink modulation OFDMA... 28
4.1 DL signal generation .......... 28
4.1.1 Scrambling .... 28
4.1.2 Modulation mapping.... 28
4.1.3 Layer mapping . 29
4.1.4 Layer pre-coding ......... 29
4.1.5 OFDM mapping 30
4.1.6 Basic OFDM signal generation ........ 30
4.2 Physical channels 30
4.2.1 OFDM mapping of PDSCH .... 30
4.2.2 OFDM mapping of PDCCH .... 30
4.2.3 OFDM mapping of CCPCH .... 31
4.3 Physical signals.... 31
4.3.1 Generation of reference signals ....... 31
4.3.2 OFDM mapping of reference signals .. 32
4.3.3 OFDM mapping of synchronization channels P-SCH and S-SCH ..... 34
3.3.1 Generation .. 35
3.3.2 Mapping ...... 35
4.4 DL macro diversity .. 35
4.5 Latency requirements under maximum load......... 35

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5. Duplexing..... 35
5.1 Duplexing in TDD........ 35
5.2 Half duplex (HD) in FDD ................... 36
5.2.1 Pros of HD-FDD... 36
5.2.2 Cons of HD-FDD.. 36
5.2.3 Specification work 36
6. Uplink modulation SC – FDMA ................ 37
6.1 Physical channels and physical reference signals ....... 37
6.2 Uplink signal generation.................... 37
6.2.1 Scrambling ........... 37
6.2.2 Modulation mapping of physical channels ............ 38
6.2.3 Spectrum shaping 38
6.2.4 Transform pre-coding................. 39
6.2.5 Mapping to physical resources... 39
6.2.6 SC-FDMA baseband signal generator .................. 39
6.3 Mapping of PUSCH..... 40
6.4 Mapping of PUCCH..... 40
6.4.1 PUCCH format 0 and 1 .............. 41
6.4.2 PUCCH format 2 .. 41
6.4.3 PUCCH format 3 .. 41
6.4.4 SC-FDMA mapping of physical channels.............. 41
6.4.5 SC-FDMA mapping of reference signals............... 41
6.4.6 SC-FDMA mapping of random access signals ..... 42
6.5 Demodulation.............. 43
6.5.1 Channelization and channel decoding .................. 43
6.5.2 Channel estimation .................... 43
6.5.3 Pilot processing.... 44
6.5.4 IRC whitening filter ..................... 44
6.5.5 Freq domain equalization........... 44
6.5.6 Bit LLR calculation ..................... 44
6.5.7 Bit deinterleaving.. 44
6.5.8 Reassembly ......... 44
6.5.9 Turbo equalization 44
6.6 Virtual MIMO ............... 44
6.6.1 Virtual MIMO (R1-051421) ......... 44
6.6.2 Scheduling of virtual MIMO (R1-051422).............. 45
6.7 PAPR reduction .......... 45
7. Logical channels (3GPP 36.212) ............. 46
7.1 Mapping of transport blocks to physical channels........ 46
7.2 Generic steps.............. 46
7.2.1 CRC ..................... 46
7.2.2 Code block segmentation........... 47
7.2.3 Channel coding (R1-070412; R1-063617) ............ 48
7.2.4 Rate matching R1-070312 ......... 52
7.2.5 Code block concatenation.......... 54
7.3 Mapping of UL-SCH on PUSCH ....... 54
7.3.1 Data and control multiplexing..... 54
7.4 HARQ.... 54
7.4.1 Application to VoIP..................... 55
7.5 Physical channel segmentation......... 55
7.6 Channel interleaving ... 55

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8. Procedures ............. 55
8.1 Synchronization ........... 55
8.1.1 Cell search 55
8.1.2 Initial cell search.... 55
8.1.3 Timing synchronization ....................... 56
8.2 Power control ... 56
8.3 Random access procedures ...................... 56
8.3.1 Physical non-synchronized random access procedure................. 57
8.4 PDSCH procedures...... 57
8.5 PUSCH procedures...... 58
8.6 PSCCH procedures...... 58
8.7 Scheduling (7.1.2.1)..... 58
8.8 Interference cancellation............................ 58
8.8.1 L2 .............. 58
8.8.2 Latencies... 59
9. References ............. 59