Different multicell location with different SIM

RE: Different multicell location with different SIM

Håkon Alseth — Fri, 16 Sep 2022 14:45:46 GMT

Hi,

[quote user="artsem artsemenka"]

For tracking applications getting multiple cells information is critical, even if it takes more energy and time.

Could you please clarify:

1. Can current modem HW scan all bands and get all visible cells regardless of the currently connected cell/band?

2. If yes, do you have plans to implement this in FW?

[/quote]

For inter-frequency neighboring cells (ie. cells on a different frequency), these are broadcasted via the SIB5 (System information block) from the network. If SIB5 is not present, NCELLMEAS will not report neighboring cells on other bands.

As you saw in the T-mobile trace, there are reported cells on a different band, so the modem supports it if the network provides this information.

Kind regards,

Håkon

RE: Different multicell location with different SIM

artsem artsemenka — Fri, 16 Sep 2022 04:26:10 GMT

Hi Håkon,

Thanks for the quick response.

For tracking applications getting multiple cells information is critical, even if it takes more energy and time.

Could you please clarify:

1. Can current modem HW scan all bands and get all visible cells regardless of the currently connected cell/band?

2. If yes, do you have plans to implement this in FW?

Arstem.

RE: Different multicell location with different SIM

Håkon Alseth — Thu, 15 Sep 2022 12:54:39 GMT

Hi,

When registered to T-mobile, you detect neighboring cells, and have up-to SIB5 present, on LTE bands 12 and 4.

For your connection towards AT&T, you have SIB2/3/4, and no reported neighboring cells other than the one you're currently connected to on band 12. You have a very strong connection to this cell, and you don't pick up any neighboring cells.

Neighboring cells has some requirements both wrt. the network you're connected to, and the surrounding PCI's:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.2/nrf/samples/nrf9160/multicell_location/README.html#cell-measurements

Kind regards,

Håkon