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TR 38.881
Lower MSD for inter-band CA/EN-DC/DC combinations

V18.0.0 (Wzip) 2023/12 64 p.

Rapporteur:: Dr. Liu, Ye
Huawei Technologies France

full Table of Contents for TR 38.881 Word version: 18.0.0

1 Scope p. 7

The present document is a technical report for study of lower MSD for inter-band CA/EN-DC/DC combinations.

2 References p. 7

3 Definitions of terms, symbols and abbreviations p. 8

3.1 Terms p. 8

3.2 Symbols p. 8

3.3 Abbreviations p. 8

4 Background p. 9

4.1 Objective p. 9

The objectives of the lower MSD objective in the Rel-18 UE RF FR1 WI are as follows:

Investigate the feasibility of lower MSD for inter-band CA/EN-DC/DC combinations [RAN4]

Select a limited set of band combinations (2-4 combinations) to cover all types of MSD (harmonic, harmonic mixing, IMD and cross band isolation)
Study how the MSD performance can be improved for the example band combinations
Study of MSD improvement with different MSD sources (harmonics, IMD2/3/4/5, cross band isolation and harmonic mixing)
Study the feasibility of and options for allowing a UE to signal improved lower MSD performance capability for combinations where MSD is allowed
Aim to conclude the study phase by RAN#99, and further discuss in RAN#99 how to handle the objective based on the study progress.

5 Band combinations selected for lower MSD analysis p. 9

The following example band combinations are used to study the feasibility of MSD improvement for different MSD types:

CA_n28-n40 (harmonic mixing)
CA_n41-n77 (cross band isolation)
CA_n1-n3-n78 and fallback combinations (IMD on the 3rd band, cross band isolation on CA_n1-n3 using 50MHz channel bandwidth, IMD2/4 and 2nd harmonic and harmonic mixing on CA_n3-n78)

6 Study of MSD improvement p. 9

6.1 General p. 9

6.2 Feasibility study p. 10

6.2.1 Evaluation from Huawei [8] p. 10

6.2.1.1 MSD analysis assumptions p. 10

6.2.1.2 MSD by Harmonic Mixing p. 10

6.2.1.3 MSD by Cross-band Isolation p. 10

6.2.1.4 MSD by Harmonic Interference p. 11

6.2.1.5 MSD by Dual-UL Inter-Modulation Distortion p. 12

6.2.1.6 Summary of MSD p. 13

6.2.2 Evaluation from Samsung [9] p. 14

6.2.2.1 CA_n3-n78 MSD Analysis on IMD2 p. 14

6.2.2.2 CA_n3-n78 MSD Analysis on IMD4 p. 15

6.2.2.3 CA_n3-n78 MSD Analysis on 2nd Harmonic p. 15

6.2.2.4 CA_n28-n40 MSD Analysis on 3nd Harmonic mixing p. 16

6.2.2.5 CA_n1-n3 MSD Analysis on cross band isolation p. 17

6.2.3 Evaluation from Nokia [10] p. 18

6.2.3.1 2nd UL harmonic for CA_3-n78 p. 18

6.2.3.1.1 MSD improvement by single RF component performance improvement p. 18

6.2.3.1.2 Possible way to achieve 20 dB MSD improvement p. 20

6.2.3.1.3 20 dB MSD improvement with less isolation improvement in Path 2 &3 p. 20

6.2.3.1.4 How to achieve MSD = 0 dB p. 21

6.2.3.2 2nd order harmonic mixing for CA_n3-n78 p. 22

6.2.3.3 IMD2 for CA_n3-n78 p. 23

6.2.3.4 MSD improvement and MSD types p. 24

6.2.4 Evaluation from Qualcomm [11] p. 25

6.2.5 Evaluation from Apple [12] p. 30

6.2.5.1 CA_n3-n78 UL 2nd harmonic MSD analysis p. 30

6.2.5.2 CA_n3-n78 2UL IMD2 MSD analysis p. 32

6.2.5.3 CA_n28-n40 3rd order harmonic mixing MSD analysis p. 34

6.2.6 Evaluation from ZTE [13] p. 36

6.2.7 Evaluation from LGE [14] p. 41

6.2.8 Evaluation from Xiaomi [15] p. 42

6.2.8.1 2nd harmonic MSD analysis for CA_n3-n78 p. 42

6.2.8.2 IMD MSD analysis for CA_n3-n78 p. 43

6.2.8.2.1 IMD2 MSD p. 44

6.2.8.2.2 IMD4 MSD p. 45

6.2.8.3 Comparison of MSD improvement for different MSD types p. 46

6.2.8.4 Cross band isolation for CA_n1-n3 (R4-2219037) p. 46

6.2.9 Evaluation from Meta [16] p. 47

6.2.9.1 MSD evaluation results by Harmonic problem p. 47

6.2.9.2 MSD evaluation results by cross band isolations p. 48

6.2.9.3 MSD evaluation results by dual uplink transmission p. 49

6.3 Conclusion p. 50

7 Study of signalling for improved lower MSD p. 50

7.1 Possible MSD reporting approaches p. 50

7.1.1 Candidate solution 1: MSD reporting depending on frequency region p. 50

7.1.2 Candidate solution 2: MSD reporting for frequency regions affected by self-interference p. 53

7.1.2.1 Basic MSD information unit p. 53

7.1.2.2 Reporting of low-MSD information p. 54

7.1.2.2.1 Aspect of higher order band combinations p. 54

7.1.2.2.2 Aspect of power classes p. 54

7.1.2.2.3 Network query based reporting p. 55

7.1.2.2.3.1 Effect of introducing frequency range as one of the filtering conditions p. 56

7.1.2.2.3.2 Effect of introducing network preferred minimum Lower MSD class as one of the filtering conditions p. 57

7.1.3 Candidate solution 3: MSD reporting for frequency regions affected by self-interference p. 58

7.1.3.1 Basic MSD information unit p. 58

7.1.3.2 Reporting of low-MSD information p. 60

7.2 Conclusion p. 61

$ Change history p. 64