nrf9160 can not registe network with nb-iot in china

[ran chuan]

您好，我最近正在学习nrf9160的开发板，在使用at指令测试时发现不能注册运营商，想了解一下是什么原因以及我需要怎么做来解决这个问题，非常感谢。在此之前我已经查阅了一些资料并已经使用 AT%XSYSTEMMODE=0,1,0,0 修改了网络模式，使用的是中国移动的sim卡，附上测试时的日志信息。以下是机器翻译：

Hello, I'm learning the development board of nrf9160 recently. I found that I can't register the operator when using at instruction test. I'd like to know why and what I need to do to solve this problem. Thank you very much. Before that, I have consulted some materials and modified the network mode by using at% xsystemmode = 0,1,0,0, using the SIM card of China Mobile, with the log information of the test. Here is machine translation:

2021-01-28T07:15:58.640Z INFO Application data folder: C:\Users\FMI\AppData\Roaming\nrfconnect\pc-nrfconnect-linkmonitor
2021-01-28T07:15:58.690Z DEBUG App pc-nrfconnect-linkmonitor v1.1.10 official
2021-01-28T07:15:58.690Z DEBUG App path: C:\Users\FMI\.nrfconnect-apps\node_modules\pc-nrfconnect-linkmonitor
2021-01-28T07:15:58.690Z DEBUG nRFConnect 3.6.1 is supported by the app (^3.6.0)
2021-01-28T07:15:58.691Z DEBUG nRFConnect path: C:\Users\FMI\AppData\Local\Programs\nrfconnect\resources\app.asar
2021-01-28T07:15:58.691Z DEBUG HomeDir: C:\Users\FMI
2021-01-28T07:15:58.691Z DEBUG TmpDir: C:\Users\FMI\AppData\Local\Temp
2021-01-28T07:16:01.314Z INFO Modem port is opened
2021-01-28T07:16:01.321Z DEBUG modem >> AT+CFUN?
2021-01-28T07:16:01.327Z DEBUG modem << +CFUN: 1
2021-01-28T07:16:01.328Z DEBUG modem << OK
2021-01-28T07:16:01.361Z DEBUG modem >> AT+CGSN=1
2021-01-28T07:16:01.367Z DEBUG modem << +CGSN: "352656106105599"
2021-01-28T07:16:01.371Z DEBUG modem << OK
2021-01-28T07:16:01.374Z DEBUG modem >> AT+CGMI
2021-01-28T07:16:01.379Z DEBUG modem << Nordic Semiconductor ASA
2021-01-28T07:16:01.380Z DEBUG modem <<
2021-01-28T07:16:01.381Z DEBUG modem << OK
2021-01-28T07:16:01.384Z DEBUG modem >> AT+CGMM
2021-01-28T07:16:01.389Z DEBUG modem << nRF9160-SICA
2021-01-28T07:16:01.390Z DEBUG modem << OK
2021-01-28T07:16:01.393Z DEBUG modem >> AT+CGMR
2021-01-28T07:16:01.397Z DEBUG modem << mfw_nrf9160_1.2.3
2021-01-28T07:16:01.399Z DEBUG modem << OK
2021-01-28T07:16:01.400Z INFO Nordic Semiconductor ASA nRF9160-SICA [mfw_nrf9160_1.2.3] SerNr: 352656106105599
2021-01-28T07:16:01.405Z DEBUG modem >> AT+CEMODE?
2021-01-28T07:16:01.409Z DEBUG modem << +CEMODE: 0
2021-01-28T07:16:01.411Z DEBUG modem << OK
2021-01-28T07:16:01.417Z DEBUG modem >> AT%XCBAND=?
2021-01-28T07:16:01.425Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)
2021-01-28T07:16:01.429Z DEBUG modem << OK
2021-01-28T07:16:01.434Z DEBUG modem >> AT+CMEE?
2021-01-28T07:16:01.440Z DEBUG modem << +CMEE: 0
2021-01-28T07:16:01.441Z DEBUG modem << OK
2021-01-28T07:16:01.443Z DEBUG modem >> AT+CMEE=1
2021-01-28T07:16:01.447Z DEBUG modem << OK
2021-01-28T07:16:01.451Z DEBUG modem >> AT+CNEC?
2021-01-28T07:16:01.455Z DEBUG modem << +CNEC: 0
2021-01-28T07:16:01.456Z DEBUG modem << OK
2021-01-28T07:16:01.458Z DEBUG modem >> AT+CNEC=24
2021-01-28T07:16:01.461Z DEBUG modem << OK
2021-01-28T07:16:01.465Z DEBUG modem >> AT+CGEREP?
2021-01-28T07:16:01.471Z DEBUG modem << +CGEREP: 0,0
2021-01-28T07:16:01.475Z DEBUG modem << OK
2021-01-28T07:16:01.478Z DEBUG modem >> AT+CGDCONT?
2021-01-28T07:16:01.482Z DEBUG modem << OK
2021-01-28T07:16:01.485Z DEBUG modem >> AT+CGACT?
2021-01-28T07:16:01.489Z DEBUG modem << OK
2021-01-28T07:16:01.492Z DEBUG modem >> AT+CGEREP=1
2021-01-28T07:16:01.496Z DEBUG modem << OK
2021-01-28T07:16:01.499Z DEBUG modem >> AT+CIND=1,1,1
2021-01-28T07:16:01.504Z DEBUG modem << OK
2021-01-28T07:16:01.507Z DEBUG modem >> AT+CEREG=5
2021-01-28T07:16:01.513Z DEBUG modem << OK
2021-01-28T07:16:01.516Z DEBUG modem >> AT+CEREG?
2021-01-28T07:16:01.524Z DEBUG modem << +CEREG: 5,4,"FFFE","FFFFFFFF",9,0,0,"00000000","00000000"
2021-01-28T07:16:01.526Z DEBUG modem <<
2021-01-28T07:16:01.526Z DEBUG modem << OK
2021-01-28T07:16:01.530Z DEBUG modem >> AT%CESQ=1
2021-01-28T07:16:01.534Z DEBUG modem << OK
2021-01-28T07:16:01.538Z DEBUG modem >> AT+CESQ
2021-01-28T07:16:01.544Z DEBUG modem << +CESQ: 99,99,255,255,255,255
2021-01-28T07:16:01.545Z DEBUG modem << OK
2021-01-28T07:16:01.548Z DEBUG modem >> AT%XSIM=1
2021-01-28T07:16:01.554Z DEBUG modem << OK
2021-01-28T07:16:01.557Z DEBUG modem >> AT%XSIM?
2021-01-28T07:16:01.561Z DEBUG modem << %XSIM: 1
2021-01-28T07:16:01.562Z DEBUG modem << OK
2021-01-28T07:16:01.566Z DEBUG modem >> AT+CPIN?
2021-01-28T07:16:01.572Z DEBUG modem << +CPIN: READY
2021-01-28T07:16:01.573Z DEBUG modem << OK
2021-01-28T07:16:01.577Z DEBUG modem >> AT+CPINR="SIM PIN"
2021-01-28T07:16:01.600Z DEBUG modem << +CPINR: "SIM PIN",3
2021-01-28T07:16:01.604Z DEBUG modem <<
2021-01-28T07:16:01.605Z DEBUG modem << OK
2021-01-28T07:16:01.608Z DEBUG modem >> AT+CIMI
2021-01-28T07:16:01.612Z DEBUG modem << 460045391606257
2021-01-28T07:16:01.613Z DEBUG modem <<
2021-01-28T07:16:01.614Z DEBUG modem << OK
2021-01-28T07:16:01.615Z INFO IMSIdentity: 460045391606257
2021-01-28T07:16:16.855Z DEBUG modem << %CESQ: 29,1,12,1
2021-01-28T07:16:16.860Z DEBUG modem << +CEREG: 2,"2A43","025AC93D",9,0,0,"11100000","11100000"
2021-01-28T07:16:16.870Z DEBUG modem << [00:00:30.347,534] [0m<inf> asset_tracker: LTE cell changed: Cell ID: 39504189, Tracking area: 10819[0m
2021-01-28T07:16:16.875Z DEBUG modem << [00:00:30.356,811] [0m<inf> asset_tracker: PSM parameter update: TAU: -1, Active time: -1[0m
2021-01-28T07:16:17.136Z DEBUG modem << %CESQ: 28,1,6,0
2021-01-28T07:16:17.542Z DEBUG modem << +CSCON: 1
2021-01-28T07:16:17.546Z DEBUG modem << [00:00:31.030,090] [0m<inf> asset_tracker: RRC mode: Connected[0m
2021-01-28T07:16:17.959Z DEBUG modem << %CESQ: 30,1,11,1
2021-01-28T07:16:20.884Z DEBUG modem << +CNEC_EMM: 15
2021-01-28T07:16:20.901Z DEBUG modem << +CEREG: 4,"2A43","025AC93D",9,0,15,"11100000","11100000"
2021-01-28T07:16:20.941Z DEBUG modem << +CSCON: 0
2021-01-28T07:16:20.945Z DEBUG modem << [00:00:34.429,504] [0m<inf> asset_tracker: RRC mode: Idle[0m
2021-01-28T07:16:21.892Z DEBUG modem << %CESQ: 29,1,3,0
2021-01-28T07:16:21.898Z DEBUG modem << +CEREG: 2,"2A33","0742394B",9,0,15,"11100000","11100000"
2021-01-28T07:16:21.907Z DEBUG modem << [00:00:35.387,695] [0m<inf> asset_tracker: LTE cell changed: Cell ID: 121780555, Tracking area: 10803[0m
2021-01-28T07:16:22.134Z DEBUG modem << %CESQ: 31,1,14,2
2021-01-28T07:16:22.661Z DEBUG modem << +CSCON: 1
2021-01-28T07:16:22.666Z DEBUG modem << [00:00:36.150,268] [0m<inf> asset_tracker: RRC mode: Connected[0m
2021-01-28T07:16:24.322Z DEBUG modem << +CNEC_EMM: 15
2021-01-28T07:16:24.340Z DEBUG modem << +CEREG: 4,"2A33","0742394B",9,0,15,"11100000","11100000"
2021-01-28T07:16:24.361Z DEBUG modem << +CSCON: 0
2021-01-28T07:16:24.366Z DEBUG modem << [00:00:37.850,646] [0m<inf> asset_tracker: RRC mode: Idle[0m
2021-01-28T07:16:24.686Z DEBUG modem << %CESQ: 255,0,255,0
2021-01-28T07:16:24.696Z DEBUG modem << +CEREG: 4,"FFFE","FFFFFFFF",9,0,15,"11100000","11100000"
2021-01-28T07:16:24.700Z DEBUG modem << [00:00:38.178,955] [0m<inf> asset_tracker: LTE cell changed: Cell ID: -1, Tracking area: 65534[0m
2021-01-28T07:16:36.373Z DEBUG modem << %CESQ: 60,3,20,2
2021-01-28T07:16:36.381Z DEBUG modem << +CEREG: 2,"960A","0965C258",9,0,15,"11100000","11100000"
2021-01-28T07:16:36.389Z DEBUG modem << [00:00:49.866,729] [0m<inf> asset_tracker: LTE cell changed: Cell ID: 157663832, Tracking area: 38410[0m
2021-01-28T07:16:36.941Z DEBUG modem << +CSCON: 1
2021-01-28T07:16:36.947Z DEBUG modem << [00:00:50.429,870] [0m<inf> asset_tracker: RRC mode: Connected[0m
2021-01-28T07:16:37.055Z DEBUG modem << +CNEC_EMM: 14
2021-01-28T07:16:37.060Z DEBUG modem << +CEREG: 2,"960A","0965C258",9,0,14,"11100000","11100000"
2021-01-28T07:16:37.102Z DEBUG modem << +CSCON: 0
2021-01-28T07:16:37.106Z DEBUG modem << [00:00:50.591,156] [0m<inf> asset_tracker: RRC mode: Idle[0m
2021-01-28T07:16:42.324Z DEBUG modem << %CESQ: 24,1,18,2
2021-01-28T07:16:42.328Z DEBUG modem << +CEREG: 2,"1303","0A777F34",9,0,14,"11100000","11100000"
2021-01-28T07:16:42.337Z DEBUG modem << [00:00:55.818,634] [0m<inf> asset_tracker: LTE cell changed: Cell ID: 175603508, Tracking area: 4867[0m
2021-01-28T07:16:42.553Z DEBUG modem << %CESQ: 23,1,23,3
2021-01-28T07:16:42.816Z DEBUG modem << +CSCON: 1
2021-01-28T07:16:42.823Z DEBUG modem << [00:00:56.305,084] [0m<inf> asset_tracker: RRC mode: Connected[0m
2021-01-28T07:16:42.923Z DEBUG modem << +CNEC_EMM: 15
2021-01-28T07:16:42.930Z DEBUG modem << +CEREG: 4,"1303","0A777F34",9,0,15,"11100000","11100000"
2021-01-28T07:16:42.959Z DEBUG modem << +CSCON: 0
2021-01-28T07:16:42.964Z DEBUG modem << [00:00:56.449,371] [0m<inf> asset_tracker: RRC mode: Idle[0m
2021-01-28T07:16:43.235Z DEBUG modem << %CESQ: 255,0,255,0
2021-01-28T07:16:43.248Z DEBUG modem << +CEREG: 4,"FFFE","FFFFFFFF",9,0,15,"11100000","11100000"
2021-01-28T07:16:43.251Z DEBUG modem << [00:00:56.729,583] [0m<inf> asset_tracker: LTE cell changed: Cell ID: -1, Tracking area: 65534[0m
2021-01-28T07:16:57.192Z DEBUG modem << +CEREG: 2,"FFFE","FFFFFFFF",9,0,15,"11100000","11100000"
2021-01-28T07:17:38.117Z DEBUG modem << %CESQ: 28,1,19,2
2021-01-28T07:17:38.129Z DEBUG modem << +CEREG: 4,"1303","0A777F34",9,0,15,"11100000","11100000"
2021-01-28T07:17:38.136Z DEBUG modem << [00:01:51.612,579] [0m<inf> asset_tracker: LTE cell changed: Cell ID: 175603508, Tracking area: 4867[0m
2021-01-28T07:17:40.560Z DEBUG modem << %CESQ: 26,1,28,4
2021-01-28T07:17:53.427Z DEBUG modem << %CESQ: 26,1,23,3
2021-01-28T07:18:06.161Z DEBUG modem << %CESQ: 27,1,29,4
2021-01-28T07:18:08.787Z DEBUG modem << %CESQ: 27,1,24,3
2021-01-28T07:19:07.601Z DEBUG modem << %CESQ: 29,1,29,4
2021-01-28T07:19:10.228Z DEBUG modem << %CESQ: 28,1,24,3
2021-01-28T07:19:12.720Z DEBUG modem << %CESQ: 29,1,29,4
2021-01-28T07:19:15.347Z DEBUG modem << %CESQ: 28,1,24,3
2021-01-28T07:19:38.320Z DEBUG modem << %CESQ: 28,1,29,4
2021-01-28T07:19:40.948Z DEBUG modem << %CESQ: 28,1,24,3
2021-01-28T07:20:14.159Z DEBUG modem << %CESQ: 23,1,23,3
2021-01-28T07:20:29.519Z DEBUG modem << %CESQ: 29,1,29,4
2021-01-28T07:20:32.146Z DEBUG modem << %CESQ: 27,1,23,3
2021-01-28T07:20:34.640Z DEBUG modem << %CESQ: 28,1,28,4
2021-01-28T07:20:42.386Z DEBUG modem << %CESQ: 27,1,23,3
2021-01-28T07:20:44.879Z DEBUG modem << %CESQ: 28,1,28,4
2021-01-28T07:20:52.628Z DEBUG modem << %CESQ: 28,1,23,3
2021-01-28T07:20:55.120Z DEBUG modem << %CESQ: 29,1,29,4
2021-01-28T07:21:02.866Z DEBUG modem << %CESQ: 28,1,23,3
2021-01-28T07:21:10.481Z DEBUG modem << %CESQ: 28,1,28,4
2021-01-28T07:21:18.227Z DEBUG modem << %CESQ: 25,1,23,3
2021-01-28T07:21:20.721Z DEBUG modem << %CESQ: 27,1,28,4
2021-01-28T07:21:23.347Z DEBUG modem << %CESQ: 26,1,23,3
2021-01-28T07:22:42.641Z DEBUG modem << %CESQ: 27,1,28,4
2021-01-28T07:22:50.387Z DEBUG modem << %CESQ: 25,1,23,3
2021-01-28T07:23:49.199Z DEBUG modem << %CESQ: 27,1,28,4
2021-01-28T07:23:56.947Z DEBUG modem << %CESQ: 24,1,22,3
2021-01-28T07:25:46.889Z DEBUG modem << [00:10:00.394,989] [0m<inf> lte_lc: Network connection attempt timed out[0m
2021-01-28T07:25:47.010Z DEBUG modem << %CESQ: 255,0,255,0
2021-01-28T07:25:47.017Z DEBUG modem << +CEREG: 0,"1303","0A777F34",9,0,15,"11100000","11100000"
2021-01-28T07:25:47.107Z DEBUG modem << %XSIM: 0
2021-01-28T07:25:47.113Z DEBUG modem << [00:10:00.619,995] [0m<inf> lte_lc: Using fallback network mode[0m
2021-01-28T07:25:49.001Z DEBUG modem << %XSIM: 1
2021-01-28T07:25:49.008Z DEBUG modem >> AT+CPIN?
2021-01-28T07:25:49.018Z DEBUG modem << +CPIN: READY
2021-01-28T07:25:49.025Z DEBUG modem <<
2021-01-28T07:25:49.026Z DEBUG modem << OK
2021-01-28T07:25:49.029Z DEBUG modem >> AT+CPINR="SIM PIN"
2021-01-28T07:25:49.053Z DEBUG modem << +CPINR: "SIM PIN",3
2021-01-28T07:25:49.054Z DEBUG modem <<
2021-01-28T07:25:49.055Z DEBUG modem << OK
2021-01-28T07:25:49.061Z DEBUG modem >> AT+CIMI
2021-01-28T07:25:49.066Z DEBUG modem << 460045391606257
2021-01-28T07:25:49.066Z DEBUG modem << OK
2021-01-28T07:25:49.067Z INFO IMSIdentity: 460045391606257
2021-01-28T07:26:27.488Z DEBUG modem << +CEREG: 2,"FFFE","FFFFFFFF",7,0,15,"11100000","11100000"
2021-01-28T07:26:27.497Z DEBUG modem << [00:10:41.003,204] [0m<inf> asset_tracker: LTE cell changed: Cell ID: -1, Tracking area: 65534[0m
2021-01-28T07:35:47.128Z DEBUG modem << [00:20:00.660,400] [0m<inf> lte_lc: Network connection attempt timed out[0m
2021-01-28T07:35:47.135Z DEBUG modem << [00:20:00.667,236] [1;31m<err> asset_tracker: LTE link could not be established.[0m
2021-01-28T07:35:47.146Z DEBUG modem << [00:20:00.674,774] [1;33m<wrn> asset_tracker: Failed to establish LTE connection.[0m
2021-01-28T07:35:47.150Z DEBUG modem << [00:20:00.682,373] [1;33m<wrn> asset_tracker: Will retry in 480 seconds.[0m
2021-01-28T07:43:47.136Z DEBUG modem << [00:28:00.689,300] [0m<inf> asset_tracker: Connecting to LTE network.[0m
2021-01-28T07:43:47.143Z DEBUG modem << [00:28:00.695,892] [0m<inf> asset_tracker: This may take several minutes.[0m
2021-01-28T07:43:47.154Z DEBUG modem << [00:28:00.702,789] [1;31m<err> asset_tracker: LTE link could not be established.[0m
2021-01-28T07:43:47.158Z DEBUG modem << [00:28:00.710,296] [1;33m<wrn> asset_tracker: Failed to establish LTE connection.[0m
2021-01-28T07:43:47.170Z DEBUG modem << [00:28:00.717,895] [1;33m<wrn> asset_tracker: Will retry in 480 seconds.[0m
2021-01-28T07:51:47.151Z DEBUG modem << [00:36:00.724,853] [0m<inf> asset_tracker: Connecting to LTE network.[0m
2021-01-28T07:51:47.161Z DEBUG modem << [00:36:00.731,414] [0m<inf> asset_tracker: This may take several minutes.[0m
2021-01-28T07:51:47.165Z DEBUG modem << [00:36:00.738,342] [1;31m<err> asset_tracker: LTE link could not be established.[0m
2021-01-28T07:51:47.177Z DEBUG modem << [00:36:00.745,849] [1;33m<wrn> asset_tracker: Failed to establish LTE connection.[0m
2021-01-28T07:51:47.180Z DEBUG modem << [00:36:00.753,448] [1;33m<wrn> asset_tracker: Will retry in 480 seconds.[0m

[Henry_Chou]

May you show your registration flow and APN procedure?

If it's normal. It should be like this

echo={ +CEREG: 2,"27E8","01965335",7....OK... } //Ex:Taiwan mobile

According your modem message....

2021-01-28T07:16:16.860Z DEBUG modem << +CEREG: 2,"2A43","025AC93D",9,0,0,"11100000","11100000"

Reteun CEREG 2 is okaye. (not registered, but the MT is currently searching a new operator to register to)

But later change cell

2021-01-28T07:16:42.930Z DEBUG modem << +CEREG: 4,"1303","0A777F34",9,0,15,"11100000","11100000"

CEREG 4 is wrong....(unknow)

What's happen between two state?

 Finally the CEREG should be 1.

1: registered, home network

echo={ ...+CEREG: 1,"27E8","01965335",7.... }  //Ex:Taiwan mobile
echo={ ...+CESQ: 99,99,255,255,22,69....OK... }

[ran chuan]

非常感谢您的回复，我最后使用的是从官方网站下载的固件 nrf9160dk_asset_tracker_nbiot_legacy_pco_2020-10-30_5522ca2b.hex ；之前试过 nrf9160dk_asset_tracker_nbiot_2020-10-30_5522ca2b.hex ，nrf9160dk_at_client_2020-10-30_5522ca2b.hex 以及 at_client 例程 。都无法注册网络。
我的操作是：下载程序到开发板后打开 LTE Link Monitor ，然后依次发送 AT+CFUN=1,AT+CFUN? 。

Thank you very much for your reply. The last one I use is the firmware nrf9160dk downloaded from the official website_ asset_ tracker_ nbiot_ legacy_ pco_ 2020-10-30_ 5522ca2b. Hex; previously tried nrf9160dk_ asset_ tracker_ nbiot_ 2020-10-30_ 5522ca2b.hex ，nrf9160dk_ at_ client_ 2020-10-30_ 5522ca2b. Hex and at_ Client routine. Can't sign up for the network.

My operation is: download the program to the development board, open LTE link monitor, and then send at + CFUN = 1, at + CFUN.

[Henry_Chou]

Ran您好:

是的，理解，首篇文章有看了您的modem message，基本上雖然不是直接程序處理，

但大體上似乎是沒太大問題，只是我不確定中國移動的頻率頻段跟調變設定是否有特殊？

因為您的註冊URC返回是未知的，我個人判斷傾向AT%XCBAND,AT%XSYSTEMMODE

AT command是否有設置不當引起？

能行的話是否可以把註冊使用的AT command流程讓各位先進確認討論？(英文回覆由佳)

P.S某些命令設定應該在CFUN=4下生效的

我想我大概知道您的狀況了，

訊息內返回基站頻段FDD band9，但您的modem頻段並沒支援band9

2021-01-28T07:16:01.425Z DEBUG modem << %XCBAND: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)

這裡，解決方案，找有band9的modem code更新，或是有支援的頻段註冊。

[ran chuan]

非常感谢您的帮助，请问一下您是怎么看出来基站的频段的啊，不胜感激。

我查询了一下，中国移动支持的频段是B8,900MHz

[Henry_Chou]

2021-01-28T07:16:16.860Z DEBUG modem << +CEREG: 2,"2A43","025AC93D",9,0,0,"11100000","11100000"

這段，URC返回的cell ID兩個引號後,9

表示band9

同理我公司專案,7表示我們使用band7