Konstantinos Alexandris
eb59c2cd68
When testing x2 handover, we found a race issue between the RRC thread and the phy/mac thread (which is calling rrc_rx_tx). The UE context was updated by the RRC thread but in the middle of the update (which consists of several function calls and variables' updates) the context was accessed by rrc_rx_tx. At this point, the context was in an inconsistent state. The solution is to access RRC data in the RRC thread only. The function rrc_rx_tx now just sends an ITTI message to the RRC thread. When receiving this message, the RRC thread does the processing that was done by the function rrc_rx_tx (in the new function rrc_subframe_process). This way, the race condition disappears. However we now send an ITTI message from the phy/mac thread to the RRC thread at each subframe. That might increase the processing time of the eNB. So maybe it's not the best solution. It may also improve the realtime performance because less work is done by the phy/mac realtime thread. To be checked somehow. Also, it may be possible that some other RRC functions are still called by the phy/mac thread, which should also be checked and replaced by ITTI messages (if this solution is considered to be correct).
OpenAirInterface is under OpenAirInterface Software Alliance license.
├── http://www.openairinterface.org/?page_id=101
├── http://www.openairinterface.org/?page_id=698
It is distributed under OAI Public License V1.0.
The license information is distributed under LICENSE file in the same directory.
Please see NOTICE.txt for third party software that is included in the sources.
The OpenAirInterface (OAI) software is composed of the following parts:
openairinterface5g
├── ci-scripts: Meta-scripts used by the OSA CI process. Contains also configuration files used day-to-day by CI.
├── cmake_targets: Build utilities to compile (simulation, emulation and real-time platforms), and generated build files
├── common : Some common OAI utilities, other tools can be found at openair2/UTILS
├── doc : Contains an up-to-date feature set list
├── LICENSE
├── maketags : Script to generate emacs tags
├── nfapi : Contains the NFAPI code. A local Readme file provides more details.
├── openair1 : 3GPP LTE Rel-10/12 PHY layer + PHY RF simulation. A local Readme file provides more details.
├── openair2 : 3GPP LTE Rel-10 RLC/MAC/PDCP/RRC/X2AP implementation.
├── COMMON
├── DOCS
├── ENB_APP
├── LAYER2/RLC/ with the following subdirectories: UM_v9.3.0, TM_v9.3.0, and AM_v9.3.0.
├── LAYER2/PDCP/PDCP_v10.1.0.
├── NETWORK_DRIVER
├── PHY_INTERFACE
├── RRC/LITE
├── UTIL
├── X2AP
├── openair3: 3GPP LTE Rel10 for S1AP, NAS GTPV1-U for both ENB and UE.
├── COMMON
├── DOCS
├── GTPV1-U
├── NAS
├── S1AP
├── SCTP
├── SECU
├── UDP
├── UTILS
└── targets: Top-level wrappers for unitary simulation for PHY channels, system-level emulation (eNB-UE with and without S1), and realtime eNB and UE and RRH GW.
RELEASE NOTES:
v0.1 -> Last stable commit on develop branch before enhancement-10-harmony
v0.2 -> Merge of enhancement-10-harmony to include NGFI RRH + New Interface for RF/BBU
v0.3 -> Last stable commit on develop branch before the merge of feature-131-new-license. This is the last commit with GPL License
v0.4 -> Merge of feature-131-new-license. It closes issue#131 and changes the license to OAI Public License V1.0
v0.5 -> Merge of enhancement-10-harmony-lts. It includes fixes for Ubuntu 16.04 support
v0.5.1 -> Merge of bugfix-137-uplink-fixes. It includes stablity fixes for eNB
v0.5.2 -> Last version with old code for oaisim (abstraction mode works)
v0.6 -> RRH functionality, UE greatly improved, better TDD support,
a lot of bugs fixed. WARNING: oaisim in PHY abstraction mode does not
work, you need to use v0.5.2 for that.
v0.6.1 -> Mostly bugfixes. This is the last version without NFAPI.
v1.0.0 -> January 2019. This version first implements the architectural split described in doc/oai_lte_enb_func_split_arch.png picture.
Only FAPI, nFAPI and IF4.5 interfaces are implemented.
Repository tree structure prepares future integrations of features such as LTE-M, nbIOT or 5G-NR.
Preliminary X2 support has been implemented.
S1-flex has been introduced.
New tools: config library, telnet server, ...
A lot of bugfixes and a proper automated Continuous Integration process validates contributions.
v1.0.1 -> February 2019: Bug fix for the UE L1 simulator.
v1.0.2 -> February 2019: Full OAI support for 3.13.1 UHD