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End-of-life (EOL) of FlexRAN

FlexRAN has been OpenAirInterface's (4G) RAN Controller before there was
O-RAN or an E2 interface. It has been initially merged with tag
2016.w49. Multiple iterations added functionality to control the MAC; to
dynamically add multiple MMEs; to control handover; to retrieve
statistics of MAC, RLC, PDCP, GTP, RRC, S1AP; to control slicing
operation; and other functionality, to name a few.

Development has stalled, and another controller named FlexRIC, based on
the E2 interface, has been implemented. The latter's E2 Agent will be
added to OAI soon. The now deprecated FlexRAN is therefore removed in
preparation to merge FlexRIC's E2 Agent in the future.

Integration branch 2022 week 49:

!1714 first-fix-rrc-mac-interface
!1755 DL/UL channel estimation improvement
!1788 NR RRC harmonization of CSI reporting
!1848 Remove old RNTI at MAC layer when Msg3 RRCSetupRequest carries ng-5G-S-TMSI-Part1
deactivate SRS in SA tests: creates RT problems
!1809 Doppler Effect
!1831 Nr ue fix asn1 memleak
!1842 Parallelize ASN.1 generation and build
!1853 Correct ue_ip driver module for RHEL9
!1850 Fix T1 offload test
!1461 Optimize LTE TM2 modulation (doesn't work well but it is already the case)
!1806 Repair doxygen documentation generation
!1856 hotfix for nr_rrc_data_req for the unfortunate SDU size 255

Integration branch 2022 week 48:

!1781 Add 4G MBMS tests to RAN-Container-Parent
!1803 Improve dot_product function
!1836 Fix OPENAIR_DIR in CMakeLists.txt
!1840 PHR fix: re-compute TBS after reducing PRBs or MCS
!1841 Tpool: Unlock after broadcast in abortNotifiedFIFO()
!1843 NR DU: nr rrc: hotfix: set default priority correctly
!1763 Remove FlexRAN
!1789 SRB0 via RLC
!1834 cleanup of gNB PHY structures
!1844 RU: stop RF after all threads finished
!1811 NR UE improve TX thread
!1807 Harmonization of RRC SearchSpace configuration
!1819 ldpc offload: initialize R

Integration branch 2022 week 47:

!1824 NR msg4 retransmission fix
!1827 Print ASN1 messages to console only if DEBUG_ASN1 flag is enabled
!1794 Replace gaussdouble() by gaussZiggurat()
!1829 bugfix in SRS configuration
!1830 Fix infinite loop in ULSCH scheduler when scheduling for multiple UEs
!1821 Send RRCReconfiguration when RA with Msg3 through DCCH also when the UE is in the InitialBWP (review pending)
!1797 NR UE move ULSCH PHY memory to stack
!1792 NR SA Tutorials v5
!1826 Update docker documentation
!1825 Fixes to improve CI

Integration branch 2022 week 42:

MR !1726 removing pucch-ResourceCommon from dedicated BWP
MR !1736 OAI UE Security Mode Complete bug
MR !1739 NR UE - Capture PduSessionEstablishmentAccept message
MR !1742 Remove EXMIMO
MR !1754 Remove threads_t struct from the code
MR !1758 Use pMAX value in configuration file, instead of hardcoded '23' in asn1_msg.c
MR !1678 Update 5G NR SA tutorials

Integration branch 2022 week 40:

MR !1727 Reorganize physical simulators and cleanup
MR !1716 Updated values for few parameters in asue config file
MR !1735 NR feature set update
MR !1560 RAN challenge: Timing Advance
MR !1741 ulsim help update
MR !1744 Speedup container build repo clone and other improvements
MR !1747 Fix signed integer overflow in PSS search
MR !1749 hotfix for thread-pool.c
MR !1743 CI AW2S: build images
MR !1717 Entrypoint updated for deployment on cluster

Integration branch 2022 week 46:

!1782 NR UE improve RA procedures (pt.1)
!1801 fix in NR PUCCH scheduler when the list is larger than a frame
!1802 workaround issue of N310 with UHD >= 4.2.0 when changing the BW
!1804 Fix for NR MSG4 scheduler
!1805 Pucch2 hotfix
!1808 fix NFAPI_MAX_NUM_UL_PDU according to SCF specifications
!1810 F1 fixes for interoperability with Accelleran CU
!1786 removing PRB at DC to avoid wrong noise level computation for PUSCH
!1813 Fix broken multiple DRBs
!1816 NR ULSCH/DLSCH scheduler fixes
!1660 Add SA test with COTS UE and F1 split
!1795 feat(ci): transition the Slack notification from old pipeline to container-based pipeline

Integration branch 2022 week 45:

!1745 Configurable re-transmission rounds in dlsim and ulsim
!1699 NR RRC pdsch_Config harmonization
!1787 Bugfix in Delta_TF calculation for PHR
!1790 remove unused NR RRC code
!1774 Fix BWP switching to the previous active BWP when there is a RA with Msg3 through DCCH or DTCH
!1772 Add RRC measurement configuration and handling
!1731 replacing call to RRC processing timers for msg3 dcch
!1764 NR_UE: improve timing and initial frequency synchronization
!1777 NR UE move DLSCH PHY memory to stack
!1791 missed to test return code of bind()

Integration branch 2022 week 43:

!1679 NR MAC PUCCH rework
!1723 Disabling dualConnectivityPHR
!1759 cleanup NR UE dead code
!1767 Fixes in CSI UE reception and reporting
!1775 Generate SRS sequence for every received SRS signal
!1776 SIMDE fix: Native AVX intrinsic call as macro
!1778 CI: Log pod build statistics
!1779 Tutorials: minor updates and improvements
!1780 feat(ci): migrating all LTE monolithic scenarios w/ docker approach
!1686 TDLA30, TDLB100 and TDLC300 channel models
!1769 PDU decoding workaround when there are issues in UL TB payload
!1753 numactl and thread-pinning in CI
!1784 PSEA - SABOX - fix apn issue

Integration branch 2022 week 42b:

MR !1479 [CI] Update for retransmission checkers
MR !1733 pusch_Config harmonization
MR !1748 Fixes for build on centos 7/8, SIMDE, auto-detect AVX2/512 and architecture
MR !1756 feat(ci): adding push / pull images operations to/from a local registry
MR !1760 Add time stamp in the logs
MR !1761 Merge targets/COMMON to executables
MR !1771 Draft: Remove CN_UTIL
MR !1770 (fix): removing the amf fqdn paramter
MR !1768 Rename radio folder
MR !1766 NR UE fix rxdata allocation
MR !1720 NR MIMO 2x2 Support Hooks in L2simulator

Integration branch 2022 week 42:

MR !1726 removing pucch-ResourceCommon from dedicated BWP
MR !1736 OAI UE Security Mode Complete bug
MR !1739 NR UE - Capture PduSessionEstablishmentAccept message
MR !1742 Remove EXMIMO
MR !1754 Remove threads_t struct from the code
MR !1758 Use pMAX value in configuration file, instead of hardcoded '23' in asn1_msg.c
MR !1678 Update 5G NR SA tutorials

Integration branch 2022 week 40:

MR !1727 Reorganize physical simulators and cleanup
MR !1716 Updated values for few parameters in asue config file
MR !1735 NR feature set update
MR !1560 RAN challenge: Timing Advance
MR !1741 ulsim help update
MR !1744 Speedup container build repo clone and other improvements
MR !1747 Fix signed integer overflow in PSS search
MR !1749 hotfix for thread-pool.c
MR !1743 CI AW2S: build images
MR !1717 Entrypoint updated for deployment on cluster

Integration branch 2022 week 40:

MR !1597 Multiple DRB Support
MR !1607 SRS feedback for 1 layer
MR !1644 Add Positioning Reference Signal (PRS) to gNB and nrUE
MR !1665 CI fix for UE ID
MR !1700 fix for DCI bundle size in NR gNB
MR !1701 Change LDPC decoder rate based on round/rv
MR !1712 Ue remove PUCCH global vars
MR !1713 NR improvements for SIB1 detection and RA procedures
MR !1728 Ue remove thread id
MR !1732 CI september cleanup
MR !1737 Changed gnu99 to gnu11 flag
MR !1636 SIMDE

Integration branch 2022 week 39

MR !1653 NR removing semi_static structures
MR !1690 Fix PDCCH when BWPStart is higher than 0
MR !1706 AMF and NGU mode config cleanup
MR !1721 Moving targets/ARCH to sdr/
MR !1724 Updated README for l2-sim, rf-sim
MR !1725 min_rxtxtime=6 added to docs when building the RFSimulator UE
MR !1729 fix(doc): healthchecks are now embedded in CN5G images

Integration branch 2022 week 38:

MR !1491 E1ap implementation skeletons
MR !1650 added multiple thread support for ECPRI/IF5 interface.and changed old pthread_cond_XXX mechanisms for RU to use thread-pool. New paramters in RU section to control thread CPU pinning and threadpool size.
MR !1675 NR_UE fixes for odd number of PRBs
MR !1694 Fix ulprbbl based on SRS
MR !1697 chore(ci): putting the Legacy LTE CI bench in order
MR !1703 SSB subcarrier offset from command line at UE
MR !1709 fix encoding error in mbms by regrouping the missing barrier at a single level
MR !1711 Increase log buffer: handle large log messages
MR !1715 Correct set gNB_ID, gNB_CU_ID does not exist

Integration branch 2022 week 37b:

MR !1695 fix bug added in MR1609 improve-nr_ul_channel_estimation branch
MR !1704 remove target/SCRIPTS
MR !1708 Repair cluster-build pipeline

Integration branch 2022 week 37:

MR !1618 update NR MAC/RLC/PDCP stats
MR !1639 NR handling of PHR (preliminary version)
MR !1676 make 5 MHz BW work in SA mode with OAI UE
MR !1687 quick fix for gnb.sa.band41.fr1.106PRB.usrpb210.conf
MR !1688 fix bug gtp-u len and robustify the gtp-u receiver
MR !1691 Fix power calculation based on CSI-RS
MR !1692 nr rlc: fix in process_control_pdu()
MR !1693 Fix to support subscribing event from another thread
MR !1681 Build RHEL8 images on Openshift Cluster
MR !1595 Sanitize NSSAI configuration in the gNB conf file

Integration 2022 week 36

MR !785 Add .clang-format file
MR !1487 LDPC offload on T1 card
MR !1677 NR LBRM for UL
MR !1683 Schedule ULSCH in flexible slots in InitialBWP
MR !1674 Optimize nr_rotation
MR !1685 Fix AssertFatal in Msg3
MR !1684 Implementation of a RA timer to remove UE in the case of Msg4 not be decoded by the UE
MR !1669 Fixes when there is no spCellConfig configured
MR !1648 simplify thread pool configuration
MR !1609 improve-nr_ul_channel_estimation

Integration branch 2022 week 35:

MR !1571 PHY procedures for SRS MIMO
MR !1666 gzip optim, links for size
MR !1668 Update core images to latest develop for CI
MR !1670 Fix initial_cyclic_shift for pucch-ConfigCommon
MR !1671 Fix unaligned channel processing with odd number of rb
MR !1672 Enable 2 Downlink layers MIMO and other minor improvements in default configuration files
MR !1680 Fix buffer overflow and division by 0 for SRS

Integration branch 2022 week 33:

MR !1604 RRC harmonization of multiple BWPs configuration
MR !1657 NR fixes for 100MHz and 2 layers
MR !1646 Add 4G L2simulator test
MR !1662 fix a bug: multi ues in rfsimulator 4G
MR !1559 NR UE multi SSB meas
changes to disable legacy 4G F1 test
MR !1661 fix bugs in config module and config usage
MR !1562 Correctly handle SIGINT/stop signal in nr-softmodem
MR !1659 Fix segFault in SRS for odd number of PRBs