Q. Why UE that supports EN-DC have been stuck in LTE specific carrier and did not perform 5G_NR Secondary_Cell_Addition? Noting that we have 3-LTE carriers & 1-5G NR carrier.
A. According to 3GPP TS 38.101-3 version 15.2.0 Release 15 paragraph 5.2B that mention operating bands for DC in below sequence. In this issue , you have to review 3GPP DC_Band_Combination and steering UE on correct LTE Carrier anchoring that support DC.
Supported DC_Band_Combination :
5.2B.2 Intra-band contiguous EN-DC
5.2B.2.1 EN-DC (two bands)
5.2B.3 Intra-band non-contiguous EN-DC
5.2B.3.1 EN-DC (two bands)
5.2B.3.2 EN-DC (three bands)
5.2B.4 Inter-band EN-DC within FR1
5.2B.4.1 EN-DC (two bands)
5.2B.4.2 EN-DC (three bands)
5.2B.4.3 EN-DC (four bands)
5.2B.4.4 EN-DC (five bands)
5.2B.4.5 EN-DC (six bands)
5.2B.5 Inter-band EN-DC including FR2
5.2B.5.1 EN-DC (two bands)
5.2B.5.2 EN-DC (three bands)
5.2B.5.3 EN-DC (four bands)
5.2B.5.4 EN-DC (five bands)
5.2B.6 Inter-band EN-DC including both FR1 and FR2
5.2B.6.1 EN-DC (two bands)
5.2B.6.2 EN-DC (three bands)
5.2B.6.3 EN-DC (four bands)
5.2B.6.4 EN-DC (five bands)
5.2B.6.5 EN-DC (six bands)
