[srslte-users] srsLTE, control channel (PDCCH) decoding, CRC pass in PDSCH

[Ismael Gomez]

Hi Inkyu,

We have a commercial product that does exactly what you are looking for. It
is called AirScope and you can find more information here:

http://www.softwareradiosystems.com/wp-content/uploads/2017/04/SRS_airscope.pdf

If you need more info or example capture samples, just drop us an email at:
sales at softwareradiosystems.com

Regards
Ismael

On Tue, 27 Feb 2018 at 11:50 Inkyu Bang <inkyu219 at gmail.com> wrote:

> Hi, all.
>
> We are trying to decode all PDCCH messages and corresponding DCI messages
> and to get some messages in PDSCH by modifying srsLTE open sources (in real
> time).
>
> This kind of work was already done by [1] and [2] ([1] used their own code
> and [2] utilized srsLTE).
>
> [1] Swarun Kumar et al. "LTEye: LTE Radio Analytics Made Easy and
> Accessible", sigcomm 2014.
> [2] Nicola Bui et al. "OWL: a Reliable Online Watcher for LTE Control
> Channel Measurements",  ATC (All Things Cellular) 2016.
>
> We run the test for 1 hours recording all RA-RNTI (1~10) recovered from
> PDCCH and corresponding RAR message.
> The problem we are facing is that majority of the PDSCH of RAR do not pass
> CRC.
>
> We have checked the following for sure.
> (1) We have good signal quality (Constellation using pdsch_ue example).
> (2) Our USRP is close to the base station (We can obtain the location of
> eNB using an android application such as "Network Cell Info".).
> (3) srsLTE itself is working correctly. When we decode SI (system
> information), i.e., PDCCH by SI-RNTI and corresponding PDSCH, we get
> correct results.
>
> We use the following setup:
> DELL Latitude E5570
> Intel Core  i7-6820HQ CPU @ 2.70GHz × 8
> Intel HD Graphics 530 (Skylake GT2)
> 8GB RAM
> 256 SSD
> OS: Ubuntu 16.04 (64bit)
> SDR (software-defined radio) device: USRP B210
>
> Thus, we have concluded that our USRP (B210) may not support these several
> procedures (decoding several PDCCH and corresponding PDSCH) within 1ms (one
> subframe) for real time.
>
> Do you have any idea of this issue?
>
> Thanks
> Regards,
> Inkyu bang
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>
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