Tech-invite 3GPPspace IETFspace

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Content for TR 36.878 Word version: 13.0.0

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2 References p. 6

3 Definitions, symbols and abbreviations p. 6

3.1 Definitions p. 6

3.2 Symbols p. 7

3.3 Abbreviations p. 7

4 Introduction p. 8

4.1 Study item objective p. 8

5 RRM and demodulation requirements enhancements under existing high speed scenario p. 9

5.1 General p. 9

5.2 RRM requirements enhancements under existing high speed scenario p. 10

5.2.1 Simulation assumptions p. 10

5.2.2 Performance characterization p. 13

5.2.2.1 RLM p. 13

5.2.2.1.1 Simulation Results p. 13

5.2.2.1.2 Summary p. 14

5.2.2.2 RSRP/RSRQ measurement accuracy p. 14

5.2.2.2.1 Simulation results p. 14

5.2.2.2.2 Summary p. 18

5.2.2.3 Cell identification p. 18

5.2.2.3.1 Simulation results p. 18

5.2.2.3.2 Summary p. 19

5.3 UE Demodulation requirements enhancements under existing high speed scenario p. 19

5.3.1 Simulation assumptions p. 20

5.3.2 Performance characterization p. 21

5.3.2.1 Simulation results of PDSCH under the existing high speed scenario p. 21

5.3.2.2 Summary of evaluation p. 25

5.4 BS Demodulation requirements enhancements under existing high speed scenario p. 26

5.4.1 Simulation assumptions p. 26

5.4.2 Performance characterization p. 26

5.4.2.1 Limiting factors for high speed performance p. 26

5.4.2.1.1 ICI p. 26

5.4.2.1.2 Doppler tracking and channel estimation performance p. 28

5.4.2.2 Simulation results of PUSCH under the existing high speed scenario p. 28

5.4.2.3 Summary of evaluation p. 32

6 RRM and demodulation requirements enhancements under identified high speed scenarios p. 32

6.1 General p. 32

6.2 Identified Scenarios p. 32

6.2.1 Proposed scenarios p. 32

6.2.2 Scenario summary p. 34

6.2.3 Possible new channel models p. 35

6.2.3.1 SFN scenario (RRH sharing the same cell id) p. 35

6.2.3.2 Leaky cable in Tunnel (from leaky cable to repeater) p. 37

6.3 RRM requirements enhancements under identified high speed scenarios p. 38

6.3.1 Simulation assumptions p. 38

6.3.1.1 SFN scenarios p. 38

6.3.1.1.1 RLM p. 38

6.3.1.1.2 RSRP/RSRQ accuracy p. 39

6.3.1.2 Leaky cable (1st hop of scenario 2c) p. 40

6.3.1.2.1 RLM p. 40

6.3.1.2.2 RSRP/RSRQ accuracy p. 41

6.3.1.2.3 Cell identification p. 41

6.3.2 Performance characterization p. 43

6.3.2.1 SFN scenarios p. 43

6.3.2.1.1 RLM p. 43

6.3.2.1.2 RSRP/RSRQ accuracy p. 44

6.3.2.2 Leaky cable (1st hop of scenario 2c) p. 47

6.3.2.2.1 RLM p. 47

6.3.2.2.2 RSRP/RSRQ accuracy p. 49

6.3.2.2.3 Cell identification p. 51

6.3.3 Possible essential enhancement options p. 52

6.3.4 Other issues and possible options p. 52

6.4 Downlink performance enhancements under identified high speed scenarios p. 53

6.4.1 Simulation assumptions p. 53

6.4.2 Performance characterization p. 54

6.4.2.1 SFN scenario (RRH sharing the same cell id) p. 54

6.4.2.2 Leaky cable in tunnel p. 62

6.4.2.3 Summary of evaluation p. 63

6.4.3 Possible essential enhancement options p. 63

6.4.3.1 Advanced receiver in high speed scenario p. 63

6.4.3.2 BS frequency pre-compensation p. 64

6.4.3.3 Unidirectional SFN scenario p. 65

6.4.3.3.1 Unidirectional SFN scenario (RRHs sharing the same cell id, beams aligned in same direction) p. 66

6.4.3.3.2 Simulation assumptions for Unidirectional SFN p. 73

6.4.3.3.3 Performance characterization of the Unidirectional SFN scenario p. 74

6.4.3.4 HST RRH with distributed orthogonal antenna ports (DOAP) p. 77

6.5 Uplink performance enhancements under identified high speed scenarios p. 78

6.5.1 Simulation assumptions p. 78

6.5.2 Performance characterization p. 79

6.5.2.1 SFN scenario (RRH sharing the same cell id) p. 79

6.5.2.1.1 PUSCH/PUCCH analysis p. 79

6.5.2.1.2 PRACH analysis p. 79

6.5.2.2 Leaky cable in tunnel p. 82

6.5.2.3 Summary of evaluation and analysis p. 83

6.5.3 Possible essential enhancement options p. 83

6.5.3.1 A new restricted set of cyclic shifts for extra high speed cells p. 83

6.5.3.2 Unidirectional RRH arrangement p. 84

6.5.3.2.1 Uplink characteristics in Unidirectional RRH arrangement p. 84

7 Conclusions p. 88

A Mobility in Unidirectional SFN Deployment p. 89

A.1 Mobility in Unidirectional SFN Deployment p. 89

$ Change History p. 91