[srslte-users] Can't receive data in subframe 0

[Kewin Rausch]

Hi everyone,

I'm currently able to transmit data on subframe 0 without having to modify
the srsLTE library code.
I've already tested such data transmission with srsUE and legacy hardware
like Nexus 5, and it works nicely (data transmitted on subframe 0, in my
case, is the SIB2).

My CFI is 3, and I use 6 RB (1.4 MHz) LTE signal.

Cheers,
Kewin R.


On Tue, Apr 11, 2017 at 1:57 PM, Felipe Augusto Pereira de Figueiredo <
zz4fap at gmail.com> wrote:

> Hi Folks,
>
> I ran some tests and figured out DCI was not being found during the DCI
> search.
> Then, I went to function "srslte_pdcch_ue_locations_ncce" in pdcch.c and
> changed the following line. The "for" should follow the values in Table
> 9.1.1-1: PDCCH candidates monitored by a UE in TS 36.213.
>
>     //for (i = 0; i < SRSLTE_MIN(nof_cce / L,
> S[l]/PDCCH_FORMAT_NOF_CCE(l)); i++) {
>     for (i = 0; i < (S[l]/PDCCH_FORMAT_NOF_CCE(l)); i++) {
>
> Now I'm able to find the CRC corresponding to the C-RNTI being used,
> however, I still can't decode the transmitted data.
>
> Kind Regards,
>
> Felipe Augusto
>
> On Tue, Apr 11, 2017 at 10:18 AM, Ismael Gomez <ismael.gomez@
> softwareradiosystems.com> wrote:
>
>> sharetechnote.com is a good reference.
>>
>> On Mon, 10 Apr 2017 at 16:18 Felipe Augusto Pereira de Figueiredo <
>> zz4fap at gmail.com> wrote:
>>
>>> Dear folks,
>>>
>>> Could you kindly provide me with some references on how to calculate if
>>> there is enough space for the DCI and the PDSCH for a given CFI
>>> configuration?
>>> As told before, I'm trying to transmit data on subframe 0 but it has
>>> been no avail so far.
>>>
>>> I'm using CFI equal to 1 instead of 3 (but I also tried with CFI=3),
>>> sending just one DCI (I'm using the pdsch_enodeb example) and the data is
>>> using all the RBs (25 RBs) with MCS=0 which corresponds to a TB of 680 bits.
>>>
>>> I'd like to calculate it and try to understand what is happening.
>>>
>>> Many thanks and Best regards,
>>>
>>> Felipe Augusto
>>>
>>>
>>>
>>> On Mon, Apr 3, 2017 at 10:50 PM, Ismael Gomez <
>>> ismael.gomez at softwareradiosystems.com> wrote:
>>>
>>> I don't know. You should calculate it. It depends on the BW.
>>>
>>> On Mon, 3 Apr 2017 at 22:49 Felipe Augusto Pereira de Figueiredo <
>>> zz4fap at gmail.com> wrote:
>>>
>>> Dear Ismael,
>>>
>>> Many thanks for your reply!
>>>
>>> I'm using CFI equal to 1 instead of 3 (but I also tried with CFI=3),
>>> sending just one DCI (I'm using the pdsch_enodeb example) and the data is
>>> using all the RBs (25 RBs) with MCS=0 which corresponds to a TB of 680 bits.
>>>
>>> Do you think I have enough space for the DCI with that configuration?
>>>
>>> Thanks and Kind Regards,
>>>
>>> Felipe Augusto
>>>
>>>
>>>
>>> On Mon, Apr 3, 2017 at 10:41 PM, Ismael Gomez <
>>> ismael.gomez at softwareradiosystems.com> wrote:
>>>
>>> Hi Felipe,
>>>
>>> There are less resource elements in subframe 0 for PDSCH. Make sure that
>>> there is enough space for the DCI and the PDSCH for your CFI configuration.
>>>
>>> On Sun, 2 Apr 2017 at 11:16 Felipe Augusto Pereira de Figueiredo <
>>> zz4fap at gmail.com> wrote:
>>>
>>> Hi Folks,
>>>
>>> I'm doing some experiments with the srsLTE source code and I'd like to
>>> transmit data on every subframe 0, however, even after modifying the source
>>> code (the pdsch enodeb and ue examples) I'm not receiving anything on any
>>> subframe 0 except PBCH transmissions (MIB). I added some printf's and
>>> figured out that no DCI is being found during the blind search at ue side.
>>>
>>> I'm not sure if the problem is that the enodeb is not adding the DCI
>>> properly or if the ue is not being able to decode DCI on subframe 0.
>>>
>>> Is there any bug/tricky that refrains the eNodeB or the UE from
>>> transmitting/receiving data on subframe 0?
>>>
>>> I'm using pdsch_enodeb and pdsch_ue examples.
>>>
>>> Many thanks in advance and Kind Regards,
>>>
>>> Felipe Augusto
>>>
>>>
>>>
>>> ---------- Forwarded message ----------
>>> From: *Felipe Augusto Pereira de Figueiredo* <zz4fap at gmail.com>
>>> Date: Fri, Mar 31, 2017 at 5:17 PM
>>> Subject: Can't receive data in subframe 0
>>> To: srslte-users at lists.softwareradiosystems.com
>>>
>>>
>>> Hi srsLTE group,
>>>
>>> I'm doing some experiments with the code and I'd like to transmit data
>>> on subframe 0, however, even after modifying the source code I'm not
>>> receiving anything on any subframe 0 except PBCH transmissions (MIB). I
>>> figured out that any DCI is being found during the blind search but as I
>>> understand, at eNodeB side it is being added to the grid.
>>>
>>> Is there any bug/tricky that refrains the eNodeB or the UE from
>>> transmitting/receiving data on subframe 0?
>>>
>>> I'm using pdsch_enodeb and pdsch_ue examples.
>>>
>>> Thanks and Kind Regards,
>>>
>>> Felipe Augusto
>>>
>>>
>>>
>>>
>
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