[srslte-users] Problem with 15 and 20 MHz bandwidth and MIMO

[Xavier Arteaga]

Hi,
I can answer to your first two questions:

*1. The setup works with USRP B210 till a Bandwidth of 10 MHz. For 15 and
20 MHz, mobile phone is not able to search the network. There was some
mention of adjusting power setting in sib1/sib2. Can anyone point to a
working configuration?*
There is a fix on the eNb side in next release (very soon) which fixes a
defect for 20MHz cell.

*2. When I set nof_ports=2 and tm=3 or 4 for MIMO, the leds in B210 blink
for a second and then there is no transmission but srsenb is running in
terminal without any error. What am I missing in this setup?*
The USB3 throughput is not enough. *You need to add to device_args
otw_format=sc12 in the ue.conf.*

Let me know how it goes.

Regards,
Xavier

On 28 June 2018 at 05:18, <samjegal at gmail.com> wrote:

> Hello,
>
> I worked with using USRP B210 that was poor performance issue with 15, 20
> Mhz BW.
> As long as you could use better device like that USRP X310, N310.
>
> Best & Regards,
> MinKeun Park
>
>
> On June 20, 2018 at 5:31:12 PM, Kartik Seth (kartikseth90 at gmail.com)
> wrote:
>
> Hello,
>
> I got srsenb working with nextepc by refering http://nextepc.org/
> docs/tutorial/1-your_first_lte/
> The initial setup was unreliable and then after someone mentioned on list
> to set log=none, the setup started working with some reliability. Now I am
> facing mainly three issues:
>
> 1. The setup works with USRP B210 till a Bandwidth of 10 MHz. For 15 and
> 20 MHz, mobile phone is not able to search the network. There was some
> mention of adjusting power setting in sib1/sib2. Can anyone point to a
> working configuration?
>
> 2. When I set nof_ports=2 and tm=3 or 4 for MIMO, the leds in B210 blink
> for a second and then there is no transmission but srsenb is running in
> terminal without any error. What am I missing in this setup?
>
> 3. With bladerf, there is always same error of 'Overrun detected in
> scheduled RX. Some valid samples were read'. Tried with 3 different
> bladerf. Any comment on this issue?
>
> Thanks
> Kartik
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