[srsran-users] Requesting RRC Reestablishment as 0x46. Cause: otherFailure

[Antonio Albanese]

Hi guys,

I'm experiencing the behavior in subject while running srsRAN with a USRP
B210 and an off-the-shelf UE.
I tested it with a Galaxy Tab S2 and an iPhone 12 with no discernible
difference.

In particular, especially with *n_prb = 100*, I get RRC failures now and
then. I attached the eNB log right before and right after such a
disconnection.
I'm working on an application that requires high radio stability and high
bandwidth to estimate the distance between the eNB and the UE via DMRS.
While experimenting I could see that the estimated distance by the
crosscorrelation lag between the received DMRS and the local DMRS copy kind
of drifted with time, which I would ascribe to one party not being able to
keep its TTI-level synchronization. The host is an *Intel NUC7i7DNBE* and
is completely dedicated to the task. The behavior is still there even with
a clean version of srsRAN without any source code edits.

I also attach the eNB configuration. I tried playing with the
*device_args *setting
it to *num_recv_frames=64,num_send_frames=64 *with no luck.

Any help would be much appreciated.

Thank you,
Antonio

-----------------------------------------------------------------------------------------------------------------------------


linux; GNU C++ version 5.4.0 20160609; *Boost_105800*;
*UHD_003.009.007-6-g9ebbb8eb*
---  Software Radio Systems LTE eNodeB  ---

Couldn't open , trying /home/nuc/.config/srsran/enb.conf
Reading configuration file /home/nuc/.config/srsran/enb.conf...
Couldn't open sib.conf, trying /home/nuc/.config/srsran/sib.conf
Couldn't open rr.conf, trying /home/nuc/.config/srsran/rr.conf
Couldn't open rb.conf, trying /home/nuc/.config/srsran/rb.conf

Built in Release mode using commit 5275f33 on branch master.

/home/nuc/srsRAN/srsenb/src/enb_cfg_parser.cc:1216: Force DL EARFCN for
cell PCI=1 to 1800
Opening 1 channels in RF device=default with args=default
Available RF device list: UHD  zmq
Trying to open RF device 'UHD'
Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
-- Detected Device: B210
-- Operating over USB 3.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 23.040000 MHz...
-- Actually got clock rate 23.040000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
RF device 'UHD' successfully opened

==== eNodeB started ===
Type <t> to view trace
Setting frequency: DL=1865.0 Mhz, UL=1770.0 MHz for cc_idx=0 nof_prb=100
RACH:  tti=10011, cc=0, preamble=44, offset=1, temp_crnti=0x46
User 0x46 connected
RACH:  tti=5421, cc=0, preamble=22, offset=1, temp_crnti=0x47
User 0x47 requesting RRC Reestablishment as 0x46. Cause: otherFailure
Disconnecting rnti=0x46
ᐧ
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