Hi,
I'm still working with Sierra Wireless MC7354 modem, this time with only
LTE connection. My tests are made by using a signal attenuator with only
one cell.
Bringing the modem al low signal levels I discovered two different cases:
* Case 1 - High signal - low signal - high signal (slowly) OK:
Modem state machine transist correctly
(connected->disconnecting->enabled->searching->registered->connecting->connected)
* Case 2 - High signal - low signal - high signal (slowly) FAILURE:
This test case attempts to simulate something similar to the
entrance/exit of a tunnel.
ModemManager state machine doesn't transist, it remains connected and
the bearer doesn't disconnect. Reset MM service doesn't recover
connection, only reset modem works.
But querying Modem by AT!GSTATUS? command, we can see that it is on RRC
Idle indefinitely:
!GSTATUS:
Current Time: 1518 Temperature: 40
Bootup Time: 0 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B13 LTE bw: 5 MHz
LTE Rx chan: 5230 LTE Tx chan: 23230
EMM state: Registered No Cell
RRC state: RRC Idle
IMS reg state: No Srv
RSSI (dBm): -87 Tx Power: 0
RSRP (dBm): -106 TAC: 0001 (1)
RSRQ (dB): -6 Cell ID: 00000100 (256)
SINR (dB): 19.2
MM log between RRC connected and RRC Idle states:
ModemManager[11185]: [/dev/cdc-wdm0] Received message (translated)...
>>>>>> QMUX:
>>>>>> length = 31
>>>>>> flags = 0x80
>>>>>> service = "nas"
>>>>>> client = 2
>>>>>> QMI:
>>>>>> flags = "response"
>>>>>> transaction = 14
>>>>>> tlv_length = 19
>>>>>> message = "Get Signal Strength" (0x0020)
>>>>>> TLV:
>>>>>> type = "Result" (0x02)
>>>>>> length = 4
>>>>>> value = 00:00:00:00
>>>>>> translated = SUCCESS
>>>>>> TLV:
>>>>>> type = "Signal Strength" (0x01)
>>>>>> length = 2
>>>>>> value = 9E:08
>>>>>> translated = [ strength = '-98' radio_interface = 'lte' ]
>>>>>> TLV:
>>>>>> type = "Strength List" (0x10)
>>>>>> length = 4
>>>>>> value = 01:00:83:02
>>>>>> translated = { [0] = '[ strength = '-125' radio_interface =
'cdma-1xevdo' ] '}
ModemManager[11185]: <debug> [1461671245.821746]
[mm-broadband-modem-qmi.c:2841]
signal_strength_get_quality_and_access_tech(): Signal strength (lte):
-98 dBm
ModemManager[11185]: <debug> [1461671245.821772]
[mm-broadband-modem-qmi.c:2860]
signal_strength_get_quality_and_access_tech(): Signal strength
(cdma-1xevdo): -125 dBm
ModemManager[11185]: <debug> [1461671245.821794]
[mm-broadband-modem-qmi.c:2874]
signal_strength_get_quality_and_access_tech(): Signal strength: -98 dBm
--> 25%
ModemManager[11185]: <debug> [1461671245.821866] [mm-iface-modem.c:1204]
update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0:
signal quality updated (25)
ModemManager[11185]: [/dev/cdc-wdm0] Received message...
>>>>>> RAW:
>>>>>> length = 42
>>>>>> data =
01:29:00:80:01:09:02:05:00:24:00:1D:00:02:04:00:00:00:00:00:1A:08:00:D8:09:00:00:00:00:00:00:19:08:00:E1:18:00:00:00:00:00:00
ModemManager[11185]: [/dev/cdc-wdm0] Received message (translated)...
>>>>>> QMUX:
>>>>>> length = 41
>>>>>> flags = 0x80
>>>>>> service = "wds"
>>>>>> client = 9
>>>>>> QMI:
>>>>>> flags = "response"
>>>>>> transaction = 5
>>>>>> tlv_length = 29
>>>>>> message = "Get Packet Statistics" (0x0024)
>>>>>> TLV:
>>>>>> type = "Result" (0x02)
>>>>>> length = 4
>>>>>> value = 00:00:00:00
>>>>>> translated = SUCCESS
>>>>>> TLV:
>>>>>> type = "Rx Bytes Ok" (0x1a)
>>>>>> length = 8
>>>>>> value = D8:09:00:00:00:00:00:00
>>>>>> translated = 2520
>>>>>> TLV:
>>>>>> type = "Tx Bytes Ok" (0x19)
>>>>>> length = 8
>>>>>> value = E1:18:00:00:00:00:00:00
>>>>>> translated = 6369
ModemManager[11185]: <debug> [1461671250.815327] [mm-port-serial.c:1288]
mm_port_serial_open(): (ttyUSB2) device open count is 2 (open)
ModemManager[11185]: <debug> [1461671250.815749]
[mm-port-serial-at.c:459] debug_log(): (ttyUSB2): --> 'AT!GSTATUS?<CR>'
ModemManager[11185]: <debug> [1461671250.932135]
[mm-port-serial-at.c:459] debug_log(): (ttyUSB2): <-- '<CR><LF>!GSTATUS:
<CR><LF>Current Time: 1506\9\9Temperature: 40<CR><LF>Bootup Time:
0\9\9Mode: ONLINE <CR><LF>System mode: LTE \9PS
state: Attached <CR><LF>LTE band: B13 \9\9LTE bw: 5
MHz <CR><LF>LTE Rx chan: 5230\9\9LTE Tx chan: 23230<CR><LF>EMM
state: Registered \9Normal Service <CR><LF>RRC state: RRC
Connected <CR><LF>IMS reg state: No Srv \9\9<CR><LF><CR><LF>RSSI
(dBm): -98\9\9Tx Power: 0<CR><LF>RSRP (dBm): -126\9\9TAC: 0001
(1)<CR><LF>RSRQ (dB): -9\9\9Cell ID: 00000100 (256)<CR><LF>SINR
(dB): 0.2<CR><LF><CR><LF><CR><LF>OK<CR><LF>'
ModemManager[11185]: <debug> [1461671250.932764] [mm-port-serial.c:1345]
_close_internal(): (ttyUSB2) device open count is 1 (close)
ModemManager[11185]: <debug> [1461671256.942383] [mm-port-serial.c:1288]
mm_port_serial_open(): (ttyUSB2) device open count is 2 (open)
ModemManager[11185]: <debug> [1461671256.943353]
[mm-port-serial-at.c:459] debug_log(): (ttyUSB2): --> 'AT!GSTATUS?<CR>'
ModemManager[11185]: <debug> [1461671257.061151]
[mm-port-serial-at.c:459] debug_log(): (ttyUSB2): <-- '<CR><LF>!GSTATUS:
<CR><LF>Current Time: 1512\9\9Temperature: 40<CR><LF>Bootup Time:
0\9\9Mode: ONLINE <CR><LF>System mode: LTE \9PS
state: Attached <CR><LF>LTE band: B13 \9\9LTE bw: 5
MHz <CR><LF>LTE Rx chan: 5230\9\9LTE Tx chan: 23230<CR><LF>EMM
state: Registered \9Normal Service <CR><LF>RRC state: RRC
Connected <CR><LF>IMS reg state: No Srv \9\9<CR><LF><CR><LF>RSSI
(dBm): -98\9\9Tx Power: 0<CR><LF>RSRP (dBm): -122\9\9TAC: 0001
(1)<CR><LF>RSRQ (dB): -14\9\9Cell ID: 00000100 (256)<CR><LF>SINR
(dB): 2.6<CR><LF><CR><LF><CR><LF>OK<CR><LF>'
ModemManager[11185]: <debug> [1461671257.061991] [mm-port-serial.c:1345]
_close_internal(): (ttyUSB2) device open count is 1 (close)
ModemManager[11185]: [/dev/cdc-wdm0] Received message...
>>>>>> RAW:
>>>>>> length = 50
>>>>>> data =
01:31:00:80:03:02:04:00:00:24:00:25:00:29:05:00:A8:01:A8:01:01:12:0C:00:A8:01:A8:01:07:34:32:34:2D:34:32:34:11:02:00:01:0B:01:06:00:01:01:01:02:01:08
ModemManager[11185]: [/dev/cdc-wdm0] Received message (translated)...
>>>>>> QMUX:
>>>>>> length = 49
>>>>>> flags = 0x80
>>>>>> service = "nas"
>>>>>> client = 2
>>>>>> QMI:
>>>>>> flags = "indication"
>>>>>> transaction = 0
>>>>>> tlv_length = 37
>>>>>> message = "Serving System" (0x0024)
>>>>>> TLV:
>>>>>> type = "MNC PCS Digit Include Status" (0x29)
>>>>>> length = 5
>>>>>> value = A8:01:A8:01:01
>>>>>> translated = [ mcc = '424' mnc = '424' includes_pcs_digit =
'yes' ]
>>>>>> TLV:
>>>>>> type = "Current PLMN" (0x12)
>>>>>> length = 12
>>>>>> value = A8:01:A8:01:07:34:32:34:2D:34:32:34
>>>>>> translated = [ mcc = '424' mnc = '424' description = '424-424' ]
>>>>>> TLV:
>>>>>> type = "Data Service Capability" (0x11)
>>>>>> length = 2
>>>>>> value = 01:0B
>>>>>> translated = { [0] = 'lte '}
>>>>>> TLV:
>>>>>> type = "Serving System" (0x01)
>>>>>> length = 6
>>>>>> value = 01:01:01:02:01:08
>>>>>> translated = [ registration_state = 'registered'
cs_attach_state = 'attached' ps_attach_state = 'attached'
selected_network = '3gpp' radio_interfaces = '{ [0] = 'lte '}' ]
ModemManager[11185]: <debug> [1461671260.670856]
[mm-broadband-modem-qmi.c:4607] common_process_serving_system_3gpp():
Processing 3GPP info...
ModemManager[11185]: <info> [1461671260.671082]
[mm-iface-modem-3gpp.c:1171] update_registration_state(): Modem
/org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed
(roaming -> registering)
ModemManager[11185]: <info> [1461671260.671336]
[mm-iface-modem-3gpp.c:1096]
update_registration_reload_current_registration_info_ready(): Modem
/org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed
(registering -> home)
ModemManager[11185]: <debug> [1461671263.072413] [mm-port-serial.c:1288]
mm_port_serial_open(): (ttyUSB2) device open count is 2 (open)
ModemManager[11185]: <debug> [1461671263.072658]
[mm-port-serial-at.c:459] debug_log(): (ttyUSB2): --> 'AT!GSTATUS?<CR>'
ModemManager[11185]: <debug> [1461671263.092805]
[mm-port-serial-at.c:459] debug_log(): (ttyUSB2): <-- '<CR><LF>!GSTATUS:
<CR><LF>Current Time: 1518\9\9Temperature: 40<CR><LF>Bootup Time:
0\9\9Mode: ONLINE <CR><LF>System mode: LTE \9PS
state: Attached <CR><LF>LTE band: B13 \9\9LTE bw: 5
MHz <CR><LF>LTE Rx chan: 5230\9\9LTE Tx chan: 23230<CR><LF>EMM
state: Registered \9No Cell <CR><LF>RRC state: RRC
Idle <CR><LF>IMS reg state: No Srv \9\9<CR><LF><CR><LF>RSSI
(dBm): -87\9\9Tx Power: 0<CR><LF>RSRP (dBm): -106\9\9TAC: 0001
(1)<CR><LF>RSRQ (dB): -6\9\9Cell ID: 00000100 (256)<CR><LF>SINR
(dB): 19.2<CR><LF><CR><LF><CR><LF>OK<CR><LF>'
ModemManager[11185]: <debug> [1461671263.093076] [mm-port-serial.c:1345]
_close_internal(): (ttyUSB2) device open count is 1 (close)
ModemManager[11185]: [/dev/cdc-wdm0] Received message...
>>>>>> RAW:
>>>>>> length = 18
>>>>>> data = 01:11:00:80:03:02:04:00:00:02:00:05:00:10:02:00:B5:08
ModemManager[11185]: [/dev/cdc-wdm0] Received message (translated)...
>>>>>> QMUX:
>>>>>> length = 17
>>>>>> flags = 0x80
>>>>>> service = "nas"
>>>>>> client = 2
>>>>>> QMI:
>>>>>> flags = "indication"
>>>>>> transaction = 0
>>>>>> tlv_length = 5
>>>>>> message = "Event Report" (0x0002)
>>>>>> TLV:
>>>>>> type = "Signal Strength" (0x10)
>>>>>> length = 2
>>>>>> value = B5:08
>>>>>> translated = [ strength = '-75' radio_interface = 'lte' ]
ModemManager[11185]: <debug> [1461671266.334031]
[mm-broadband-modem-qmi.c:7030] event_report_indication_cb(): Signal
strength indication (lte): -75 dBm --> 62%
ModemManager[11185]: <debug> [1461671266.334135] [mm-iface-modem.c:1204]
update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0:
signal quality updated (62)
Diego López
Teltronic
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