PTRS leads to code shortening, and the current LDPC implementation has issues with that for higher code rate.
Because of this, we have to disable PTRS by default, as we test MCS 28 in CI.

   - if L_ptrs is >= number of pusch symbols, then no ptrs will be scheduled

NR fix downlink IP

See merge request oai/openairinterface5g!806

   - The bug occurs when the PUSCH allocation contains the central RB of the whole UL BW

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

See merge request oai/openairinterface5g!804

Develop Integration Branch : 2020 week 15

The following Merge Requests have been included :

* MR 789 : fix sync source configuration for eNB and B200-mini
* MR 795 : dft/fft in shared lib
* MR 795 : NR gNB SCF indication
* MR 798 : Improvements on the "default" LTE-4G scheduler

Merge remote-tracking branch 'origin/NR_RRCConfiguration_sync_source' into develop_integration_2020_w15_bis

Instead of looping over UEs and all DL config Req/HI DCI0, loop first
over all DL config Req/HI DCI0, and for each, match UE.  Lowers CPU
traffic for high traffic situations.