5G RestrictDCNR & 5G Icon

1. SIB2 ULI:  https://volteromania.blogspot.com/p/sib2.html

 

1'.

Restrict from MME to eNodeB

"If ULA is received with "Access-Restriction" carrying "NR as Secondary RAT Not Allowed", MME sends the Initial Context Setup Request message with "NR Restriction" bit set in Handover Restriction List "

2. RestrictDCNR flag in Attach Accept (coming from EPC based on HSS subscription)

3. VDF RO : some LTE B3 (1800MHz) cells send SIB2 ULI, while their coverage might be larger than associated NR n78 (3500MHz) cells.

4.  Based on the info specified above and other paramenters,  we have 5G icon Display in UEs

US: https://www.reddit.com/r/ATT/comments/gy4kex/att_confirms_5g_is_offline_in_chico_ca_despite_5g/

5. OnePlus 8 & OnePlus 8 Pro Cellmapper : 5G views