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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.
Dr. Liu, Ye
Huawei Technologies France

full Table of Contents for  TR 38.881  Word version:  18.0.0

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1  Scopep. 7

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

2  Referencesp. 7

3  Definitions of terms, symbols and abbreviationsp. 8

3.1  Termsp. 8

3.2  Symbolsp. 8

3.3  Abbreviationsp. 8

4  Backgroundp. 9

4.1  Objectivep. 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 analysisp. 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 improvementp. 9

6.1  Generalp. 9

6.2  Feasibility studyp. 10

6.2.1  Evaluation from Huawei [8]p. 10

6.2.2  Evaluation from Samsung [9]p. 14

6.2.3  Evaluation from Nokia [10]p. 18

6.2.4  Evaluation from Qualcomm [11]p. 25

6.2.5  Evaluation from Apple [12]p. 30

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

6.2.9  Evaluation from Meta [16]p. 47

6.3  Conclusionp. 50

7  Study of signalling for improved lower MSDp. 50

$  Change historyp. 64

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