- this commit was necessary because the location of the MAC UE
  functions does not reflect the context in which they are used
- therefore all UL scheduling-related functions have been moved
  to a new nr_ue_scheduler.c file
- and the irrelevant file rar_tools_nrUE.c has been deleted
  (nr_ue_process_rar moved to nr_ue_procedures)
- the new locations are supposed to make the file and functions
  organisations more structured and cleaner

- new data structure RAR_grant_t to handle RAR grant
- new common ul scheduler function
- new common ul pdu configuration function handling ul grants
- new function to fill ul_config_request
- moved pdu configuration code from process dci function
- merged procedures for Msg3 and PUSCH together in nr_ue_scheduler
- the same functions are now handling both PUSCH and Msg3
- relying on ul_config (no more RA Msg3 frame and slot storage)
- done some cleanup and logging in the process

- this return whether the transform precoder is enabled or not
- redundant configuration code has been migrated to the new function
- get_transformPrecoding is a common MAC function used already
  @ UE side, can be adopted by gNB too

- this will be later be necessary in DCI procedures which are dependent on
  the RNTI type

- now transmitting resetting Msg3 slot and frame to -1 after transmission
- cleanup in Msg3 scheduling
- checked Msg3 pdu configuration against the 3GPP specs

- new data struct is RA_config_t
- all RA-related members have been moved to the new struct
- static variables have been migrated too

- sorted out according to recurring logic that wants function
  prototypes in separate files from data struct and constants
  definitions, variables in separate .c files with inclusion
  of "extern" header files
- moved function prototypes to resective header files
- moved data structures and constants to respective header files
- merged unnecessary mac.h file into mac_defs.h @ MAC UE
- moved const variables suchs as tables to respective .c files
- moved extern references to respective extern.h files

- related to section 5 of 3GPP TS 38.321 specs
- handling of RA failure
- handling of RA completion
- first implementation of contention-based RA procedures
- minor fixes related to ue_get_rach and init_ra functions

- RA preamble power computation review
- RSRP review
- PCmax computation
- Pathloss computation
- cleanup of reference to LTE
- minor fixes

- enhancement of DL indication flow for Msg2 (RAR)
- merging interface procedures to handle DLSCH and RAR together
- better separation of MAC and PHY functionalities
- cleanup of double ambiguous functions to process RAR
- merging functions to process TA command into the ue_ta_procedures function
- enhancement of logging and formatting in the process

- moved fill_dl_indication to phy procedures
- introduced a new function to fill the RX indication
- replaced redundant configuration code with the fill functions
- extended the function to fill the rx indication
- handling different dl pdus types
- cleanup of redundant code

- fixes to backoff counter procedure
- updated received target power computation (TS 38.321 R16)

- review/cleanup of commented out descriptions
- logging
- indentation
- spacing
- typos
- cleanup of unused RA_tx_frame, RA_tx_slot members

- moved init code to new function init_RA
- moved relevant variables from MAC to prach_resources
- cleanup of unused struct members
- other minor fixes

- according to clause 7.1.1. of TS 38.213

- focus: RA procedures, PHY procedures

- Moved code for SSB to RACH mapping config to new function
- Moved RA preambles configuration routine to new function
- Removed irrelevant arguments to nr_get_prach_resources
- turned some struct members and local vars into global vars
- added checks on the RA Type as per TS 38.321 clause 5.1.1
- minor cleanups
- currently only 4-step RA is available

- as defined by clause 12 "BWP Operation" TS 38.213
- cleaned up hardcoded usage

- fetching configuration from RRC
- removed hardcoded params (e.g. bwp_id)
- added BWP Id members to MAC instance
- introduced offsetToCarrier

- whether it is 2-step or 4-step RA
- added checks on CFRA and 2-step RA pointer members
- introduced enum and PRACH resources struct member

- removed irrelevant prach_config_enabled parameter
- cleanup of commented out code
- minor fixes
- enhancement of logging

- skipping RA procedures when MAC is disabled
- added mac_enabled flag that allows to disable RA and TA at UE from CL

- removed unused arguments to phy functions
- removed irrelevant conditions on UE run mode
- replaced hardcoded param with PHY UE stored value

- focus: defs_nr_UE.h, nr-ue.c, phy_procedures_nr_ue.c, nr_init_ue.c
- removed long-time commented out code
- replaced hardcoded params
- removed unnecessary header inclusions

- extern vars to phy_extern_nr_ue.c
- def/undef to defs_nr_ue.h

- replaced eNB naming with gNB

MR991: Remove hack in LTE PDCP for noS1 mode  
- Removes a hack which was used when LTE PDCP was used for NR in noS1 mode

MR993: UL and DL fixes LDPC short codewords 
- Fix UL & DL LDPC decoding for short LDPC code, e.g. Z_c is not multiple of 8
- Fix DLSCH data transmission with multiple DMRS symbols per slot
- small TA fixes on OAI 5G NR UE
- Implemented CQI measurement at NR UE
- NR UE cleanup 

MR1000: doc: fix build directory in BASIC_SIM.md

MR960: 256 QAM demodulation routines  
- Added functions for demodulation of 256 QAM signals.
- Added a command line flag to enable mcs table entry in PDSCH-Config in RRC to use 2nd MCS table for PDSCH.
- Added an option for using 256 QAM mcs table in nr_dlsim.

MR989: Docker and Deployment improvements (CI)  
- Image generation for eNB --> template for configuration files and dedicated entrypoint in Ubuntu
- Docker-compose-based EPC deploy
- Traffic test fully validated using the `trf-gen` container
- Flexran-rtc support when deployed in a container (Not fully done for the X2 Handover part)
- Added docker-compose-based eNB deployment
- Retrieve logs for such eNB deploymnent 
- Functional and log  update of nsa fr1 test but valid for gNB terminate also (enhanced ping stats and gNB markers)

MR992: Fix data transmission in "do-ra" mode
- UL and DL Traffic works now in do-ra mode, but there are still some PUCCH issues remaining. These issues are harming the acknowledgement of DL packets, and thus leading to unnecessary retransmissions.
The relevant warnings at UE are:
`PUCCH Invalid pucch resource indicator: at line 1082 in function select_pucch_resource of file openair1/SCHED_NR_UE/pucch_uci_ue_nr.c`
and
`PUCCH Error for number of bits for acknowledgment : at line 909 in function get_downlink_ack of file openair1/SCHED_NR_UE/pucch_uci_ue_nr.c`
Note: UE needs rbconfig.raw and reconfig.raw files from the *currently* running gNB, as the C-RNTI is random and different for each run.