How to connect to LTE/GPRS with WP7702?


#1

I’m trying to connect to LTE or GPRS with a WP7702 module.

I use a non Sierra SIM-card that works fine with a other brand of module, so the SIM is ok.
I get only a few operators when trying with AT+COPS=?, and not my operator.

AT+CGATT=1 returns +CME ERROR: no network service.
What have I missed to configure correct?

Thanks.


#2

What is the value of
at! selrat?
At! band?
At! gstatus?
Is the band of wp7702 available with your operator?


#3

at!selrat=!SELRAT: 12, GSM and LTE Only

at!band?
Index, Name
00, All bands

at!gstatus? (new cmd for me)
!GSTATUS:
Current Time: 9271 Temperature: 29
Modem Mitigate Level: 0 ModemProc Mitigate Level: 0
Reset Counter: 2 Mode: ONLINE
System mode: GSM PS state: Attached
GSM band: GSM900
GSM channel: 51
GMM (PS) state:REGISTERED NORMAL SERVICE
MM (CS) state: IDLE NORMAL SERVICE

Serving cell: 51 (GSM900 )
RX level (dBm):-70.3750 LAC: 0000 (0)
GPRS state: GPRS STANDBY Cell ID: 00005200 (20992)

To my knowledge, the same LTE bands as the other working module are available for the WP7702 aswell.

Thanks


#4

Didn’t it is connected from at! gstatus ?
Why do you need to enter +cgatt ?


#5

Do I not need AT+CGATT cmd?

What cmd to activate internet connection then?
Looking for a substitute for AT^SICA=1,1

Still no LTE though.

Thanks


#6

@datalasse,

Can you share the responses to the below commands?

at+cimi
at+cops=?

This way we can see the networks the unit can see and try to guide you a bit better.

Regards

Matt


#7

@matt: This is what I get
at+cimi
240084712398833

OK
at+cops=?
+cops: (2,“240 24”,“240 24”,“24024”,0),(1,“240 01”,“240 01”,“24001”,0),(0,1,2,3,4),(0,1,2)

OK

Thanks

Lars


#8

@datalasse,

So you can see from the IMSI number that its network has the MCC (Mobile Counrty Code)/Mobile Network Code) of 240/08 but the only networks the unit can see are 024 and 01 (both are in country 240 which I am assuming is Sweden), additionally it can only see 2G from the 0 at the end of each network sentence. The fact it cannot see any LPWA (NB1 or cat M1 ) networks is not surprising given the poor coverage of them across Europe at the moment.

Given that there is no national roaming between networks and the fact it cannot see its home network, this is the reason it is not attaching. Best solutions, use a bigger antenna or move location.

Regards

Matt


#9

@mlw , thanks for the info.
Can you explain the fact that if I use another module from antother manufacturer with the same SIM and at the same location I can find LTE operators? The other module supports the same LTE bands as the WP7702.
The only difference is different antennas, but the other one is not large either.

Regards

Lars


#10

@datalasse,

Obviously not explicitly but given you can see the other two networks implies that the unit has all four bands enabled for 2G (its default) so you should be able to see it.

Additionally, this ‘other unit’ is it attaching to 2G, cat M or NB1? Can you send at+csq to it to see how good or bad the signal is as you might be on the edge.

Regards

Matt


#11

@mlw for the WP7702 I get this:

at+csq
+csq: 22,99

This values with another antenna, but still no LTE.

Due do different size of SIM card holder it’s a bit wotk to move the SIM to the “compare module”, so I skip that for now.

Regards

Lars


#12

@datalasse,

Sorry I meant for you to send the commands to the other module (as they are 3GPP commands so will work).

You have a signal strength on the WP because it has camped on the strongest signal in emergency mode in the same way your phone does when it has no coverage of a network it can connect to.

Regards

Matt


#13

@mlw,
I tried with the other module (another SIM, but from the same operator)

at+cops=?
+COPS: (1,“Telenor SE”,“TelenorS”,“24008”,7),(2,“Telenor SE”,“TelenorS”,“24008”,2),(1,“Tele2”,“Tele2 SE”,“24007”,7),(1,“TELIA S”,“TELIA”,“24001”,0),(1,“TELIA S”,“TELIA”,“24001”,2),(1,“3 SE”,“3 SE”,“24002”,2),(1,“3 SE”,“3 SE”,“24002”,7),(1,“Sweden Mobile”,“MobileS”,“24024”,0),(1,“Tele2”,“Tele2 SE”,“24007”,2),(1,“TELIA S”,“TELIA”,“24001”,7)

OK
at+csq
+CSQ: 12,99

Regards

Lars


#14

@datalasse,

Ok I think we are getting to the bottom of things now, I do not believe that you are comparing apples with apples.

The ‘other unit’ can see 2G, 3G and LTE, this implies that the unit is not a cat M/NB1 capable unit it is far more likely to be a cat 1+ unit, this is very different to cat M1/NB1, we can tell this beause there are no 3G capable devices currently on the market that are also cat M1/NB1. Also note that it cannot see 2G either for the 24008 network, only 3G and LTE as seen in the (1,“Telenor SE”,“TelenorS”,“24008”,7),(2,“Telenor SE”,“TelenorS”,“24008”,2) response.

Given the above we can draw the following conclusions.

  • You are not in Telenor 2G coverage as neither unit can see this network hence the WP7702is not attaching to it.
  • The ‘other unit’ is attaching to the standard cat1+ LTE network and not cat M1 or NB1.
  • There is no NB1 coverage in your area.

It is for the above that the WP7702 is not working.

Regards

Matt


#15

@mlw,
Thanks alot for the explaination Matt. I’m new to LTE and it makes sense that if the modules are different the sees diffrent operators.

I will have to think this over and find a solution.

Regards

Lars


#16

Just chiming in here; afaik Telia is the only operator in Sweden with a NB1/Cat-M network. So try to get an IoT SIM from Telia and it might work better.


#17

@wto
Thanks for the additional info.

Regards

Lars