nRF9160 and nRF Cloud LTE location accuracy

RE: nRF9160 and nRF Cloud LTE location accuracy

Thao Nguyen — Thu, 18 May 2023 09:30:43 GMT

Hi AndrewKostka ,
Thank you so much.
I will try other location.

RE: nRF9160 and nRF Cloud LTE location accuracy

AndrewKostka — Tue, 16 May 2023 16:56:44 GMT

Hi Thao:
I can't find the cells you're sending in our data, nor on CellMapper. What's likely happening is that because these towers can't be resolved, the API is falling back to regional positioning, either from the tracking area or some part of the eNodeB ID. It's possible these cells are too new to be in the dataset, or something is malformed.

RE: nRF9160 and nRF Cloud LTE location accuracy

Thao Nguyen — Tue, 16 May 2023 06:34:01 GMT

Hi Andrew,
this is my post:

{

"lte": [

{

"mcc": 452,

"mnc": 4,

"eci": 2709781,

"tac": 42900,

"earfcn": 1769,

"rsrp": 53,

"rsrq": 21

{

"mcc": 452,

"mnc": 4,

"eci": 84579607,

"tac": 43300,

"earfcn": 1769,

"rsrp": 54,

"rsrq": 17

{

"mcc": 452,

"mnc": 4,

"eci": 84579605,

"tac": 43300,

"earfcn": 1769,

"rsrp": 54,

"rsrq": 16

{

"mcc": 452,

"mnc": 4,

"eci": 84586698,

"tac": 43300,

"earfcn": 1791,

"rsrp": 47,

"rsrq": 21

{

"mcc": 452,

"mnc": 4,

"eci": 84586697,

"tac": 43300,

"earfcn": 1791,

"rsrp": 44,

"rsrq": 16

}

]

}

RE: nRF9160 and nRF Cloud LTE location accuracy

AndrewKostka — Mon, 15 May 2023 23:14:09 GMT

Hi, Thao: Can you post the towers you used in your new request? I can try to look them up in our vendor data.

RE: nRF9160 and nRF Cloud LTE location accuracy

Thao Nguyen — Mon, 15 May 2023 14:39:41 GMT

Hi Hung,
Thank you so much for response.
I used 4 towers LTE in POST data to nRF Cloud but it responses the same result. I tried to change POST data but the response doesn't change.
My nRF9160 can get 4 LTE towers here and I used them to send to nRF Cloud.

{

"lat": 20.9599936,

"lon": 105.72999716,

"uncertainty": 2498,

"fulfilledWith": "MCELL_EVAL"

}
I don't sure why nRF Cloud always reply that data although post data is changed.
I tried with other Cloud and it gave difference result for each post data

Any idea for this? Please help me.

regard,

Thao Nguyen.

RE: nRF9160 and nRF Cloud LTE location accuracy

Hung Bui — Mon, 15 May 2023 12:39:36 GMT

Hi Thao,

I have little experience with location service and nRF Cloud but I will try to help here as we are low on staff this week.

From the http request, it seems that there is only one cell used in the request 84579605 and it may explain the less accurate result. For a better accuracy, more neighbor cells should be provided ( nmr field).

There is some discussion about the accuracy of MCell here: RE: GCI search & multiple cell location

I'm not so sure if you have many cells in Do Nghia area, have you located the location of the cell 84579605 ? I couldn't find it on https://www.cellmapper.net/