[srslte-users] Timing Advance capped at 1282?

Ismael Gomez ismael.gomez at softwareradiosystems.com
Thu Mar 16 07:28:35 UTC 2017


Hi Patrick,

There shouldn't be any problem on adding more TA on the UE side. But you
are right, Amarisoft or any other eNodeB will never assign a TA higher than
1282.

BR
Ismael

On Wed, 15 Mar 2017 at 19:17 Patrick Cutno <PCutno at girdsystems.com> wrote:

> I removed the 1282 limitation but it made no difference. The Amarisoft eNB
> I am using never assigns a TA greater than 1282 to the RAR.
>
>
>
> *From:* Patrick Cutno
> *Sent:* Wednesday, March 15, 2017 10:58 AM
> *To:* srslte-users at lists.softwareradiosystems.com
> *Subject:* Timing Advance capped at 1282?
>
>
>
> srsLTE/srslte/lib/common/phy_common.c line 184 limits timing advance to a
> max of 1282 according to the LTE specifications (equivalent to 99.996 km).
> I would like to operate at ranges farther than the 100 km distance rated
> for LTE but before I remove the 1282 limitation, is there anything I should
> be warned about to save myself hours of testing? For instance any part of
> the code that would fail or depend on a value of 1282 and below?
>
>
>
> I know a lot of other things need to be modified to accommodate distances
> larger than 100 km but the core of my question is, if the eNB returns a TA
> value of 1283 and the UE doesn’t limit it to 1282, will anything break?
>
>
>
> Thanks,
>
>
>
> *Patrick Cutno*
>
> R&D Engineer
>
>
>
> *GIRD Systems, Inc.*
>
> 310 Terrace Ave.
>
> Cincinnati OH, 45220
>
> Office: (513) 281-2900
>
> PCutno at girdsystems.com
>
>
>
>
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