Multicell location using LTE cells

RE: Multicell location using LTE cells

helsing — Thu, 19 Oct 2023 13:34:00 GMT

Hi Alessio, sorry for the long delay and thank you for the details.

[quote user="SODAQHW"]The API is called while the modem is connected to the network.[/quote]

In RRC Connected mode? Try using the command in RRC Idle mode and see if it helps.

From the AT Command reference guide, regarding NCELLMEAS, Set command:

For <search_type>s 3–5, <neighbor_count> is always 0 for other cells except the serving cell, which means that the neighboring cell list is not available. If neighbor cell results for the serving cell are available when the User Equipment (UE) is in RRC Idle mode, they are preserved for 10 s after entering RRC Connected mode unless they are overwritten by RRC Connected mode measurements. If there are no preserved RRC Idle mode measurements in RRC connected mode, neighbor cell results are available only if the network has configured neighbor measurements for the UE. Valid Terminal Adapter (TA) information is available only for the serving cell. These parameters are included for all cells in the result format to keep the same structure for every cell to simplify response parsing.

Håkon

RE: Multicell location using LTE cells

SODAQHW — Mon, 25 Sep 2023 07:09:27 GMT

Hi Helsing,

i am using the lte_lc_neighbor_cell_measurement() API with search type GCI_EXTENDED_COMPLETE and a gci_count of 8.

The resulting command sent to the modem should be:

AT%NCELLMEAS=5,8

The API is called while the modem is connected to the network.

Alessio

RE: Multicell location using LTE cells

helsing — Tue, 12 Sep 2023 09:50:27 GMT

Hi Alessio, sorry for the delay.

[quote user="SODAQHW"] I never saw more than 1 neighbor cell returned by the AT%NCELLMEAS command[/quote]

How are you using the command? When do you use it and what is the state of the modem(e.g. RRC connected or idle). Which arguments are you using?

RE: Multicell location using LTE cells

SODAQHW — Mon, 04 Sep 2023 14:09:36 GMT

Hi Helsing,

Yes i tried in different cities and also while moving around different neighborhoods in Amsterdam. I never saw more than 1 neighbor cell returned by the AT%NCELLMEAS command

Alessio

RE: Multicell location using LTE cells

helsing — Mon, 04 Sep 2023 13:17:14 GMT

Hi Alessio,

[quote user=""]Another thing i noticed is that the device reports at most 1 neighbor cell even in a city like Amsterdam[/quote]

Have you tried testing the location service from multiple locations? Do you always get 1 at most?

RE: Multicell location using LTE cells

SODAQHW — Wed, 30 Aug 2023 06:37:40 GMT

Hi Cole,

understood, thanks for your reply!

Alessio

RE: Multicell location using LTE cells

Cole Hafner — Tue, 29 Aug 2023 22:15:19 GMT

Hi Alessio,

MCELL does the best in urban areas when the device is able to submit data for multiple towers. It's not always a guarantee that the accuracy will outperform SCELL, especially in rural areas. If you're looking for higher accuracy, please consider using GPS or Wi-Fi location.

Best regards,

Cole

RE: Multicell location using LTE cells

helsing — Thu, 24 Aug 2023 13:31:51 GMT

Hi Alessio, thank you for the questions. I will look into this and get back to you.