[srslte-users] Downlink HARQ with soft combining

[Xavier Arteaga]

Hi Tuan,
First of all, many thanks for your interest!

The soft-combining is performed at the rate matching the receiver side. The
demodulated-soft bits are deinterleaved and combined in soft-buffers.

For LTE:
https://github.com/srsran/srsRAN/blob/master/lib/src/phy/fec/turbo/rm_turbo.c#L403

For NR:
https://github.com/srsran/srsRAN/blob/master/lib/src/phy/fec/ldpc/ldpc_rm.c#L233

I recommend you load srsRAN with an IDE (CLion works like a charm) and
explore the functions and structure usages.

Kind regards,
Xavier


On Wed, 8 Sept 2021 at 11:35, Tuan Hoang Dinh <tuanmcx58 at gmail.com> wrote:

> Hi,
>
> I'm using srsRAN and wanna study how UE process HARQ in Downlink channel.
>
> I have been searching in the source code of srsUE to find which part is
> the function do soft combining between
> the previous (erroneous) Transpot Block and retransmission Transport Block.
> Because in 3GPP document, they said that UE needs to combine 2 blocks and
> then try to decode again.
> Could someone helps me know the position of that function?
>
> I appreciate your help!
>
> Best regards,
> Tuan
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