Critical Issues/Bug List

We list here critical issues that are identified by others along with information on gitlab branch, assigned person to look into it.

Please also refer to the issues, milestones, and branches pages on gitlab for more up-to-date information. This twiki page might become obsolete in the future.

Bugs in PHY/MAC (low layer signaling)

All the issues can be tracked under milestone, %Improve stability of L1-L2

MAC CE only sent when there is DL traffic
Failures leading to ConnectionReestablishment (milestone: Conn reestablish procedures) (NN to look into this)
- Current workaround: We send ReestablishmentReject, this will lead to a re-attach using STMSI, but only after a very long time
Attach procedure using STMSI -> (This is very critical issue. Lot of UEs do not work because of this behaviour). Navid/Lionel wants to take a look. -> AI: Rohit to test with Nexus V (Lionel)
- to be decided: shall eNB keep context even when it crashes? i.e. in a file?

Fixed

RLC AM has issues -> issue 65 -> fixed in branch, but not yet merged
Timing advance issue (L1L2 signalling has a fix)
UE removal (L1/Partial-L2): NN (L1/L2/L3)
- UE removal from RRC not ok (RRCConnectionRelease), does not remove lower layers (for all the layers of eNB)
UL scheduling: L1L2 signalling issue, https://gitlab.eurecom.fr/oai/openairinterface5g/issues/48
- very low/fluctuating throughput
- check BSR: ok now

oaisim issues

EXMIMO2 Issues:

(fixed) serious bug on lime 3 (in FPGA upsampling circuit or clock) -> DN, HM
(fixed) PLL problem in TDD mode -> fundamental problem when TX and RX PLLs are tuned to the same frequency -> requires HW and software changes
(fixed) TDD/FDD problem of lime requires modifications in HW and SW: RK to followup with Dominique
lime4 problem (some bits erronous on ODDR) due to clock
- clock has been cleaned up a bit, but issue still remains
20MHz? to be tested. It does not work on testbench
Real-time on ExpressMIMO: if TX processing is a bit late (not finished 5 mbox counters before end of subframe) it is not dma-ed to ExpressMIMO2
Harmonize EXMIMO interfaces after RRH/GW branch is in
Input from Syrtem on their code (20 MHz)

Openair-cn Issues: Milestone: https://gitlab.eurecom.fr/oai/openair-cn/milestones/1

UE removal not handled correctly in openair-CN/ There is also problem in PDCP layer of eNB
Crashes with Huawei Hilink USB dongle. https://gitlab.eurecom.fr/oai/openair-cn/issues/16
Traffic issues when eNB + EPC on same host. https://gitlab.eurecom.fr/oai/openair-cn/issues/16

UE issues

I/Q over Ethernet for UE
TEsting and include in Gitlab CI

Doxygen comments

https://gitlab.eurecom.fr/oai/openairinterface5g/issues/42

Less critical Issues/Bug List (simulation / emulation)

BLER saturation for certain MCS all TMs (fixed in TM4 branch, should go into develop)
(fixed) BW and sampling rate confusion. BW has to be globally replaced with sampling rate according to amount of RB
(fixed)In abstraction.c init_freq_channel does not work correctly with sin cos LUT
There are crashes in unitary phy simulators for secuirity messages
(fixed in TM4 branch)lte_ue_measurements.c - missing lines for subband pmi calculation.
(fixed in TM4 branch) channel level computation
prepare to merge back to develop in february