[srslte-users] What is the "time_adv_nsamples" parameter for?

[Federico Quattrin]

Hi Xavier and Naz,
I have a question too, how do I know the value of this variable for my
specific SDR?
I'm trying to make it work a N210 and maybe this could help me
Greetings!
Federico

Xavier Arteaga <xavier at softwareradiosystems.com> schrieb am Mi., 15. Mai
2019, 11:15:

> Hi Naz,
> The srsue shall transmit at a given time relative to the eNb and the UE
> uses the RF front end (B210, lime micro, ...) time stamps for indicating
> the transmission time. However, the RF front ends are not perfect and it
> normally takes them some extra samples to transmit. This is translated into
> a delayed transmission which will be reflected into a non zero Time
> Alignment while the UE is near the eNb.
>
> time_adv_nsamples is for calibrating the rf-front end, so the Time
> Alignment is zero when the UE is near the eNb. However, if this parameter
> is overset, it will cause a negative TA for which the eNb are not prepared
> and the UE will fail to attach.
>
> I hope my explanation makes sense.
>
> Kind regards,
> Xavier
>
> On Wed, 15 May 2019 at 06:59, zir ikh <nazirmik at gmail.com> wrote:
>
>> Hi, can someone tell me what the following parameter does? I'm not
>> entirely clear on it.
>>     *time_adv_nsamples*
>>
>> It is specified in the *ue.conf* file.
>>
>> regards
>>
>> Naz
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