Tech-invite 3GPPspace IETFspace

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Content for TR 36.897 Word version: 13.0.0

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2 References p. 5

3 Definitions, symbols and abbreviations p. 6

3.1 Definitions p. 6

3.2 Symbols p. 6

3.3 Abbreviations p. 6

4 Introduction p. 6

5 Evaluation scenarios and antenna configurations p. 8

5.1 Evaluation scenarios p. 8

5.2 Antenna configurations p. 8

5.2.1 Antenna array model p. 8

5.2.2 TXRU model-1 p. 10

5.2.3 Port virtualization model p. 13

5.3 Channel Reciprocity Modelling for FDD p. 13

6 Potential enhancements for elevation beamforming/FD-MIMO p. 13

6.1 Implementation based enhancement schemes p. 13

6.1.1 Category 1: Sectorization (in one or both of vertical and horizontal domains) with different cell-ID for each sector p. 13

6.1.2 Category 2: Virtual sectorization using one or more beamformed CSI-RS resource(s) with a single cell-ID (single sector as a special case) p. 14

6.1.3 Category 3: Kronecker precoding with 2 CSI processes p. 14

6.1.4 Category 4: SRS based precoding scheme in TDD p. 14

6.2 Specification based enhancement schemes p. 15

6.2.1 Potential CSI-RS and feedback enhancements p. 15

6.2.2 Potential DMRS enhancements p. 19

6.2.3 Potential enhancements for RRM measurements p. 19

7 Evaluation results p. 20

7.1 Phase 1 results p. 20

7.1.1 Scenario 1 (3D-UMa with ISD 500m) p. 20

7.1.2 Scenario 2 (3D-UMa with ISD 200m) p. 22

7.1.3 Scenario 3 (3D-UMi with ISD 200m) p. 24

7.1.4 Scenario 4 (Non co-channel heterogeneous network case with macro and small cell layer at different carrier frequencies) p. 27

7.1.5 Scenario 5 (Co-channel heterogeneous network case with macro and small cell layer with no Elevation BF/FD-MIMO in small cells) p. 28

7.1.6 Scenario 6 (Co-channel heterogeneous network case with macro and small cell layer with Elevation BF/FD-MIMO in small cells) p. 29

7.2 Phase 2 results p. 30

8 Considerations on Potential CSI-RS and Feedback Enhancements p. 48

9 Conclusions p. 49

A Simulation assumptions p. 50

A.1 Simulation assumptions for homogeneous networks (scenarios 1, 2, 3) p. 50

A.2 Simulation assumptions for non co-channel heterogeneous networks (scenario 4) p. 52

A.3 Simulation assumptions for co-channel heterogeneous networks (scenario 5, 6) p. 55

A.4 Simulation assumptions for uplink p. 55

A.5 Simulation assumptions for DMRS enhancement p. 56

$ Change history p. 58