Status command to find LTE Operating Mode & Cellular IoT (CIOT) operating mode in use?

mangOH Red
1

I am using a WP7702 module which I try to connect to an LTE-M1 network. The module is fully compliant with 3GPP Release 13 thus I expect to see a device receive bandwidth of 1.4MHz, how-ever when looking at AT!GSTATUS? is shows LTE bw: 10 MHz, which I do believe is not LTE-M1, but LTE-WB instead.

I used ATSELCIOT=6 to ensure LTE-WB is disabled, but have no way of knowing if this is actually enforced. I have not found a status command which give clues in the actual LTE operating mode and Cellular IoT (CIOT) operating mode in use.

root@swi-mdm9x28-wp:~# microcom /dev/ttyAT
AT!GSTATUS?
!GSTATUS:
Current Time:  826              Temperature: 33
Modem Mitigate Level: 0         ModemProc Mitigate Level: 0
Reset Counter: 1                Mode:        ONLINE
System mode:   LTE              PS state:    Attached
IMS reg state: UNKNOWN          IMS mode:    Not Support
IMS Srv State: UNKNOWN SMS,UNKNOWN VoIP
LTE band:      B20              LTE bw:      10 MHz
LTE Rx chan:   6400             LTE Tx chan: 24400
LTE CA state:  INACTIVE
EMM state:     Registered       Normal Service
RRC state:     RRC Idle

PCC RxM RSSI:  -62              RSRP (dBm):  -89
PCC RxD RSSI:  -62              RSRP (dBm):  -140
Tx Power:      --               TAC:         F489 (62601)
RSRQ (dB):     -9               Cell ID:     007CF70B (8189707)
SINR (dB):     20.0

OK
AT!GETBAND?
!GETBAND: LTE B20

OK
AT!SELCIOT?
Current Operating Mode: 0x6

Supported Operating Modes:
LTE WB:  0x01
LTE M1:  0x02
LTE NB1: 0x04

OK

root@swi-mdm9x28-wp:~# cm info
Device:                        WP7702
IMEI:                          352653090108903
IMEISV:                        6
FSN:                           VU810385650910
Firmware Version:              SWI9X06Y_02.36.06.00 63d944 jenkins 2020/12/10 19:12:28
Bootloader Version:            SWI9X06Y_02.36.06.00 63d944 jenkins 2020/12/10 19:12:28
MCU Version:                   002.015
PRI Part Number (PN):          9907365
PRI Revision:                  001.004
Carrier PRI Name:              GENERIC
Carrier PRI Revision:          001.071_001
SKU:                           1103530
Last Reset Cause:              Power Down
Resets Count:                  Expected: 10081  Unexpected: 1

root@swi-mdm9x28-wp:~# cm radio
Power:                         ON
Current Network Operator:      KPN
Current RAT:                   LTE network (LE_MRC_RAT_LTE)
Status:                        Registered, home network (LE_MRC_REG_HOME)
Signal:                        Very strong signal strength (5)
PS:                            Packet Switched Registered, home network (LE_MRC_REG_HOME)

root@swi-mdm9x28-wp:~# cm data
Index:                         1
APN:                           m2mc.webtrial
PDP Type:                      IPV4
Connected:                     yes
Interface:                     rmnet_data0
Family[IPv4]:                  inet
IP[IPv4]:                      100.126.108.176
Gateway[IPv4]:                 100.126.108.177
Dns1[IPv4]:                    194.151.228.34
Dns2[IPv4]:                    194.151.228.18

Does anybody know how-to reveal the LTE operating mode and Cellular IoT (CIOT) operating mode which is currently in use?

2

you can disable CAT-M1 network in AT!SELCIOT and see what happens.

Here is my module registered with CAT M1 network:

root@fx30:~# microcom /dev/ttyAT
at!gstatus?
!GSTATUS:
Current Time:  81               Temperature: 40
Modem Mitigate Level: 0         ModemProc Mitigate Level: 0
Reset Counter: 6299715          Mode:        ONLINE
System mode:   LTE              PS state:    Attached
IMS reg state: UNKNOWN          IMS mode:    Not Support
IMS Srv State: UNKNOWN SMS,UNKNOWN VoIP
LTE band:      B28              LTE bw:      5 MHz
LTE Rx chan:   9435             LTE Tx chan: 27435
LTE CA state:  INACTIVE
EMM state:     Registered       Normal Service
RRC state:     RRC Connected

PCC RxM RSSI:  -78              RSRP (dBm):  -95
PCC RxD RSSI:  0                RSRP (dBm):  0
Tx Power:      10               TAC:         0001 (1)
RSRQ (dB):     -3               Cell ID:     01A2D001 (27447297)
SINR (dB):     15.4

OK
at!selciot?
Current Operating Mode: 0x6

Supported Operating Modes:
LTE WB:  0x01
LTE M1:  0x02
LTE NB1: 0x04

OK
3

Thanks for the suggestion, I have disabled CAT-M1 AT!SELCIOT=1 and this results in no connection after waiting for 10 minutes. So yes, the connection is LTE-M1 based.

I am still confused on the reported bandwidth how-ever LTE bw: 5 MHz, especially since eMTC LTE Cat M1 (3GPP Release 13) seems to support a bandwidth of 1.4 MHz exclusively, where-as LC-LTE/MTCe LTE Cat 0 (3GPP Release 12) seems to support a bandwidth range of 1.4–20 MHz.

How should I read this value?

4

The product technical specification says it supports 3GPP LTE release 13:

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