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Last modified by Mengting Qiu on 2025/07/03 18:55
From version 131.1
edited by Edwin Chen
on 2024/02/07 00:21
Change comment: Uploaded new attachment "image-20240207002129-2.png", version {1}
To version 135.1
edited by Edwin Chen
on 2024/02/08 00:17
Change comment: There is no comment for this version

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44 44  == 2.2 Speed Up Network Attach time ==
45 45  
46 46  
47 -BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail. User can lock the band to specify band for its operator to make this faster.
47 +BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail and show Signal Strenght:99. User can lock the band to specify band for its operator to make this faster.
48 48  
49 49  (% style="color:#037691" %)**AT+QBAND?       **(%%) ~/~/ Check what is the current used frequency band
50 50  
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621 621  (% style="color:blue" %)**See result in TCP Server:**
622 622  
623 623  [[image:image-20230807233631-2.png]]
624 +
625 +
626 += 4. FAQ =
627 +
628 +== 4.1 What is the usage of Multi Sampling and One Uplink? ==
629 +
630 +The NB series has the feature for Multi Sampling and one uplink. See one of them
631 +
632 +[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SN50v3-NB_BN-IoT_Sensor_Node_User_Manual/#H2.5Multi-SamplingsandOneuplink>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SN50v3-NB_BN-IoT_Sensor_Node_User_Manual/#H2.5Multi-SamplingsandOneuplink]]
633 +
634 +User can use this feature for below purpose:
635 +
636 +1. **Reduce power consumption**. The NB-IoT transmit power is much more higher than the sensor sampling power. To save battery life, we can sampling often and send in one uplink.
637 +1. Give more sampling data points.
638 +1. Increase reliable in transmission. For example. If user set
639 +1*. **AT+TR=1800** ~/~/ The unit is seconds, and the default is to record data once every 1800 seconds (30 minutes, the minimum can be set to 180 seconds)
640 +1*. **AT+NOUD=24** ~/~/  The device uploads 24 sets of recorded data by default. Up to 32 sets of record data can be uploaded.
641 +1*. **AT+TDC=7200**  ~/~/ Uplink every 2 hours.
642 +1*. this will mean each uplink will actually include the 6 uplink data (24 set data which cover 12 hours). So if device doesn;t lost 6 continue data. There will not data lost.
643 +
644 += 5. Trouble Shooting: =
645 +
646 +== 5.1 Checklist for debuging Network Connection issue. Signal Strenght:99 issue. ==
647 +
648 +There are many different providers provide NB-IoT service in the world. They might use different band, different APN & different operator configuration. Which makes connection to NB-IoT network is complicate.
649 +
650 +If end device successfully attached NB-IoT Network, User can normally see the signal strengh as below (between 0~~31)
651 +
652 +[[image:image-20240207002003-1.png]]
653 +
654 +
655 +If fail to attach network, it will shows signal 99. as below:
656 +
657 +[[image:image-20240207002129-2.png]]
658 +
659 +
660 +(% class="lead" %)
661 +When see this issue, below are the checklist:
662 +
663 +* Does your SIM card support NB-IoT network? If SIM card doesn't not specify support NB-IoT clearly, normally it doesn't support. You need to confirm with your operator.
664 +* Do you configure the correct APN? [[Check here for APN settings>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.1GeneralConfiguretoattachnetwork]].
665 +* Do you lock the frequency band? This is the most case we see. [[Explain and Instruction>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.2SpeedUpNetworkAttachtime]].
666 +* Check if the device is attached to Carrier network but reject. (need to check with operator).
667 +* Check if the antenna is connected firmly.
668 +
669 +If you have check all above and still fail. please send console log files (as many as possible) to [[support@dragino.com>>mailto:support@dragino.com]] so we can check.
670 +
671 +
672 +== 5.2 NBIOT did not respond issue. ==
673 +
674 +(% class="box errormessage" %)
675 +(((
676 +11:24:22.397 [44596]NBIOT did not respond.
677 +11:24:24.315 [46530]NBIOT did not respond.
678 +11:24:26.256 [48464]NBIOT did not respond.
679 +11:24:28.196 [50398]NBIOT did not respond.
680 +11:24:30.115 [52332]NBIOT did not respond.
681 +11:24:32.127 [54266]NBIOT did not respond.
682 +11:24:32.127 [54299]Restart the module...
683 +11:24:39.181 [61332]No response when shutting down
684 +)))
685 +
686 +This issue might due to initiate issue for NB-IoT module. In this case, please try:
687 +
688 +1) Open Enclosure
689 +
690 +2) Power off device by pull out the power on Jumper
691 +
692 +3) Power on device by connect back the power jumper.
693 +
694 +4) push reset button.
695 +
696 +[[image:image-20240208001740-1.png]]
image-20240208001740-1.png
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1 +XWiki.Edwin
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