ATI
Quectel
RM521F-GL
Revision: RM521FGLEAR05A02M4G
RM521FGLEAR05A02M4G_01.200.01.200
I’m having a issue where enable after enabling n77/n78 in both modes along with rest of the bands, my unit is never able to connect to it and the only way it gets any 5G NR(SA) or NSA is if I have n5 or n66 bands enabled. If I disable those 2, it never works in any type of 5G.
On RM521F-GL All 5G (SA + NSA) and LTE bands = Enabled
For Comparison I have included my RM520N-GL results, and noticed that RM521F does not list n77/n78 in the ue_compatibility_band for nr5g_band and nor in policy_band. I’ve run the commands to enable ALL bands on the RM521 but no go.
What could be the issue?, is the firmware from factory on the Quectel modem?
RM521F:
AT+QNWPREFCFG=“ue_capability_band”
+QNWPREFCFG: “gw_band”,1:2:4:5:8:19
+QNWPREFCFG: “lte_band”,1:2:3:4:5:7:8:12:13:14:18:19:20:25:26:28:29:30:32:34:38:39:40:41:42:43:46:48:66:71
+QNWPREFCFG: “nsa_nr5g_band”,1:2:3:5:7:8:12:20:25:28:38:40:41:48:66:79
+QNWPREFCFG: “nr5g_band”,1:2:3:5:7:8:12:20:25:28:38:40:41:48:66:79 [Note Missing n77/n78]
RM520N-GL
AT+QNWPREFCFG=“ue_capability_band”
+QNWPREFCFG: “gw_band”,1:2:4:5:8:19
+QNWPREFCFG: “lte_band”,1:2:3:4:5:7:8:12:13:14:17:18:19:20:25:26:28:29:30:32:34:38:39:40:41:42:43:46:48:66:71
+QNWPREFCFG: “nsa_nr5g_band”,0 (manually locked to 5G SA that is why it displays 0)
+QNWPREFCFG: “nr5g_band”,2:7:8:14:18:20:25:26:28:30:38:40:41:48:66:71:77:78:79 (I have manually selected these bands)
RM521F:
OK AT+QNWPREFCFG=“policy_band”
+QNWPREFCFG: “gw_band”,1:2:4:5:6:8:19
+QNWPREFCFG: “lte_band”,1:2:3:4:5:7:8:12:13:14:17:18:19:20:25:26:28:29:30:32:34:38:39:40:41:42:43:46:48:66:71
+QNWPREFCFG: “nsa_nr5g_band”,1:2:3:5:7:8:12:13:14:18:20:25:28:29:30:38:40:41:48:66:70:71:75:76:77:78:79
+QNWPREFCFG: **“nrdc_nr5g_band”,**1:2:3:5:7:8:12:13:14:18:20:25:28:29:30:38:40:41:48:66:70:71:75:76:79
+QNWPREFCFG: “nr5g_band”,1:2:3:5:7:8:12:13:14:18:20:25:26:28:29:30:38:40:41:48:66:70:71:75:76:79
[Note Missing n77/n78]
RM520N-GL
OK AT+QNWPREFCFG=“policy_band”
+QNWPREFCFG: “gw_band”,1:2:4:5:6:8:19
+QNWPREFCFG: “lte_band”,1:2:3:4:5:7:8:12:13:14:17:18:19:20:25:26:28:29:30:32:34:38:39:40:41:42:43:46:48:66:71
+QNWPREFCFG: “nsa_nr5g_band”,1:2:3:5:7:8:12:13:14:18:20:25:26:28:29:30:38:40:41:48:66:70:71:75:76:77:78:79
+QNWPREFCFG: “nr5g_band”,1:2:3:5:7:8:12:13:14:18:20:25:26:28:29:30:38:40:41:48:66:70:71:75:76:77:78:79
Troubleshooting, I’ve run the following commands:
AT+CFUN=1,1
AT+QNWPREFCFG=“nr5g_band”,1:2:3:5:7:8:12:13:14:18:20:25:26:28:29:30:38:40:41:48:66:70:71:75:76:77:78:79
AT+QNWPREFCFG=“nr5g_band” = shows n77/n78 as ON
AT+QNWPREFCFG= “rat_acq_order”
AT+QNWCFG=“mode_pref”,NR5G = SA
This is using the exact same sim in my RM521F and RM520N, results are that the RM521F never connects to n77/n78 no matter what I do, my RM520N can lock onto band n77/n78 no problem instantly.