[srslte-users] RA procedure is not working

[Samie Mostafavi]

Hi,

I want to connect a srsUE to an OAI enodeB. RA procedure does not finish
successfully and I dont understand where the problem is. These are the
events happen after each PRACH in the srsUE log:

19:33:15.124011 [PHY0] [I] [08656] PRACH: Transmitted preamble=23,
tti_tx=8661, CFO=-0.38 KHz, nof_sf=1, target_power=-76.0 dBm
19:33:15.124042 [MAC ] [I] [08658] RA:    PDCCH:  seq=23, ra-rnti=0x2,
ra-tti=8661, f_id=0
19:33:15.126059 [RRC ] [I] MEAS:  New measurement earfcn=-1, pci=0
(serving), rsrp=-58.1 dBm.
19:33:15.133041 [PHY0] [I] [08666] PDCCH: cc=0, f=1A, cce= 0, L=2, riv=75,
pid=0, mcs={0}, rv={0}, ndi={0}, tpc_pucch=0, snr=32.7 dB
19:33:15.133077 [PHY0] [I] [08666] PDSCH: cc=0, rnti=0x2, nof_prb=4,
nof_re=600, tbs={7}, mod={2}, rv={0}, crc={OK}, it=0.5, snr=32.7 dB
19:33:15.133085 [PHY0] [I] [08666] Applying time_adv_sec=11.5 us,
next_offset=-66
19:33:15.133091 [PHY0] [I] [08666] PHY:   Set TA RAR: ta_cmd: 22, n_ta:
352, ta_usec: 11.5
19:33:15.133096 [MAC ] [I] [08667] RA:    Rx:     RAPID=23, TA=22,
T-CRNTI=0xa2d
19:33:15.135037 [MAC ] [I] [08668] UL 0:  New TX for Msg3, RV=0, TBS=18
19:33:15.135115 [PHY0] [I] [08668] PUSCH: cc=0, tti_tx=8672, rnti=0xa2d,
rb=(1,1), nof_re=144, tbs=18, mod=2, rv=0
19:33:15.135159 [MAC ] [I] [08669] RA:    ConRes: Starting
ContentionResolutionTimer=48 ms
19:33:15.143080 [PHY0] [I] [08676] PHICH: hi=0, corr=0.7, I_lowest=1,
n_dmrs=0, I_phich=0
19:33:15.143100 [MAC ] [I] [08677] RA:    ConRes: Restarting
ContentionResolutionTimer=48 ms
19:33:15.143106 [MAC ] [I] [08677] UL 0:  Non-Adaptive retx=1, RV=2,
TBS=18, HI=NACK
19:33:15.143165 [PHY0] [I] [08676] PUSCH: cc=0, tti_tx=8680, rnti=0xa2d,
rb=(1,1), nof_re=144, tbs=18, mod=2, rv=2
19:33:15.145937 [RRC ] [I] MEAS:  New measurement earfcn=-1, pci=0
(serving), rsrp=-58.1 dBm.
19:33:15.150894 [PHY0] [I] [08684] PHICH: hi=0, corr=0.7, I_lowest=1,
n_dmrs=0, I_phich=0
19:33:15.150921 [MAC ] [I] [08685] RA:    ConRes: Restarting
ContentionResolutionTimer=48 ms
19:33:15.150932 [MAC ] [I] [08685] UL 0:  Non-Adaptive retx=2, RV=3,
TBS=18, HI=NACK
19:33:15.150987 [PHY0] [I] [08684] PUSCH: cc=0, tti_tx=8688, rnti=0xa2d,
rb=(1,1), nof_re=144, tbs=18, mod=2, rv=3
19:33:15.158932 [PHY0] [I] [08692] PHICH: hi=0, corr=0.7, I_lowest=1,
n_dmrs=0, I_phich=0
19:33:15.158949 [MAC ] [I] [08693] RA:    ConRes: Restarting
ContentionResolutionTimer=48 ms
19:33:15.158952 [MAC ] [I] [08693] UL 0:  Non-Adaptive retx=3, RV=1,
TBS=18, HI=NACK
19:33:15.159006 [PHY0] [I] [08692] PUSCH: cc=0, tti_tx=8696, rnti=0xa2d,
rb=(1,1), nof_re=144, tbs=18, mod=2, rv=1
19:33:15.166129 [RRC ] [I] MEAS:  New measurement earfcn=-1, pci=0
(serving), rsrp=-58.1 dBm.
19:33:15.167099 [PHY0] [I] [08700] PHICH: hi=1, corr=0.0, I_lowest=1,
n_dmrs=0, I_phich=0
19:33:15.167111 [MAC ] [I] [08701] RA:    ConRes: Restarting
ContentionResolutionTimer=48 ms
19:33:15.186139 [RRC ] [I] MEAS:  New measurement earfcn=-1, pci=0
(serving), rsrp=-58.1 dBm.
19:33:15.206077 [RRC ] [I] MEAS:  New measurement earfcn=-1, pci=0
(serving), rsrp=-58.1 dBm.
19:33:15.214878 [MAC ] [I] [08749] RA:    ConRes: Contention Resolution
Timer expired. Stopping PDCCH Search and going to Response Error

The log file is also attached. Thank you for your help in advance!
-- 
Samie
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