Radio-Link Failure <how to debug HW setup>

[Shik-shik]

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Issue Description

• set DEFAULT configuration;
• adjust arfcn value to 3300 (no interference detected in this range);
• running srsue result to RLF situation in good signal condition and high SNR.

Setup Details

e.g. Network configuration, Operation System, Hardware, RF front-end, library and driver versions

CPU: I7-3630QM; Linux: Ubuntu 18.04; RF: bladerf x40 (both enb and ue) driver/library: $ bladeRF-cli -i --lib-version 2.2.0-2018.12-rc3-2-ppabionic

Expected Behavior

successfull RRC connection setup following with ATTACH procedure

Actual Behaviour

Failed RRC due to timer expire: 14:57:35.735166 [RRC ] [W] Proc "Connection Request" - Timer T300 expired: ConnectionRequest timed out

Steps to reproduce the problem

kindly ask you to test with bladerf x40 on default values. trying different TX/RX gain may change RSRP and SNR value but Radio-Link failure remain.

Additional Information

logs from UE and ENB in attachment to this case.

80_after_calibration.zip

[Shik-shik]

Default config files for bladeRF x40 result to RLF. after community request, other configuration was given for test:

enb.conf n_prb = 15 max_prach_offset_us = 300

sib.conf zero_correlation_zone_config = 0

ue.conf dl_earfcn = 3300 time_adv_nsamples = 40

still it is not best option (RRC connected after several attempts). But it gives sufficient information for further improvement/debug.

Appreciate for help from community members. Many thanks to justin.tallon@softwareradiosystems.com.

Issue can be closed. After stable RRC from first attempt, config info will be updated.

[jin-github1002]

@Shik-shik thank you for your issue. I set the same properties when i use limesdr as the rf end at ue and enb. it is successful for ue to attach lte network. ue and enb are connected for at most 10minutes. It is much longer than before when i use the default .conf files(dl_earfcn=3400,prb=50). But i dont know why the max online time for ue is no more than 10 minutes. Could you give some comments about how to find the exact properties for the ue and enb to make them always connected? Or Do you have any information for further improvement and debug it? Thank you so much for your help and your posted issue.