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

[Felipe Augusto Pereira de Figueiredo]

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 at 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@
>> 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@
>> 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
>>
>>
>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20170411/8c81fa40/attachment.htm>