[srslte-users] Attaching problem

Tue Oct 31 00:49:33 UTC 2017

Hi,

It looks like there are 2 issues here:

1) Msg3 transmission is not received by the eNodeB or not acknowledged.
Make sure the TX power is enough to reach the eNodeB (maximum TX power is
~10 dBm which is achieved with a tx_gain=89 setting in ue.conf). If you
have access to the eNodeB logs, maybe you can pull them and see why the
eNodeB is not sending Msg4.

2) The UE then segfaults in a call to UHD driver (that's the USRP driver).
Try swapping the USRP by another or change the driver version. What version
are you currently using?

On Mon, 30 Oct 2017 at 10:34 Lanfranco Zanzi <lanfranco.zanzi at gmail.com>
wrote:

> Here is what you required.
>
> Logs at Info level an with filename=stdout:
>
> Opening RF device with 2 RX antennas...
> Using Volk machine: avx2_64_mmx_orc
> -- Loading firmware image: /usr/share/uhd/images/usrp_b200_fw.hex...
> Opening USRP with args: otw_format=sc12
> -- Detected Device: B210
> -- Loading FPGA image: /usr/share/uhd/images/usrp_b210_fpga.bin... done
> -- Operating over USB 3.
> -- Detecting internal GPSDO.... No GPSDO found
> -- 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 16.000000 MHz...
> -- Actually got clock rate 16.000000 MHz.
> -- Performing timer loopback test... pass
> -- Performing timer loopback test... pass
> -- Setting master clock rate selection to 'automatic'.
> -- Asking for clock rate 48.000000 MHz...
> -- Actually got clock rate 48.000000 MHz.
> -- Performing timer loopback test... pass
> -- Performing timer loopback test... pass
>
> UHD Warning:
>     The requested decimation is odd; the user should expect CIC rolloff.
>     Select an even decimation to ensure that a halfband filter is enabled.
>     decimation = dsp_rate/samp_rate -> 25 = (48.000000 MHz)/(1.920000 MHz)
>
> UHD Warning:
>     The requested interpolation is odd; the user should expect CIC rolloff.
>     Select an even interpolation to ensure that a halfband filter is
> enabled.
>     interpolation = dsp_rate/samp_rate -> 25 = (48.000000 MHz)/(1.920000
> MHz)
>
> UHD Warning:
>     The requested decimation is odd; the user should expect CIC rolloff.
>     Select an even decimation to ensure that a halfband filter is enabled.
>     decimation = dsp_rate/samp_rate -> 25 = (48.000000 MHz)/(1.920000 MHz)
> -- Asking for clock rate 61.440000 MHz...
> -- Actually got clock rate 61.440000 MHz.
> -- Performing timer loopback test... pass
> -- Performing timer loopback test... pass
> -- Asking for clock rate 30.720000 MHz...
> -- Actually got clock rate 30.720000 MHz.
> -- Performing timer loopback test... pass
> -- Performing timer loopback test... pass
> 11:40:03.620349 [MAC ] Info    [00000] Resetting MAC
> 11:40:03.621149 [USIM] Info    Read Home PLMN Id=00101
> Waiting PHY to initialize...
> 11:40:03.621730 [PHY0] Info    [00000] PHY:   Configuring UL parameters
> 11:40:03.621740 [PHY0] Info    [00000] Setting new params worker_id=0,
> pregen_disabled=0
> 11:40:03.621743 [PHY1] Info    [00000] Setting new params worker_id=1,
> pregen_disabled=0
> 11:40:03.621746 [PHY2] Info    [00000] Setting new params worker_id=2,
> pregen_disabled=0
> 11:40:03.621749 [RRC ] Info    Set MAC main config: harq-MaxReTX=5,
> bsr-TimerReTX=2560, bsr-TimerPeriodic=-1
> 11:40:03.621761 [PHY0] Info    [00000] PHY:   Configuring UL parameters
> 11:40:03.621764 [PHY0] Info    [00000] Setting new params worker_id=0,
> pregen_disabled=0
> 11:40:03.621766 [PHY1] Info    [00000] Setting new params worker_id=1,
> pregen_disabled=0
> ...
> 11:40:03.621774 [PHY2] Info    [00000] Setting new params worker_id=2,
> pregen_disabled=0
> 11:40:03.621779 [NAS ] Info    Attach Request
> 11:40:03.621783 [NAS ] Info    Starting PLMN Search...
> 11:40:03.621788 [RRC ] Info    Starting PLMN search procedure
> 11:40:03.621795 [PHY0] Info    [00000] SYNC:  Starting Cell Search
> procedure in 1 EARFCNs...
> 11:40:03.621807 [PHY0] Info    [00000] SYNC:  Cell Search idx 0/1
> 11:40:03.621813 [PHY0] Info    [00000] SYNC:  Set DL EARFCN=1750,
> f_dl=1860.0 MHz, f_ul=1765.0 MHz
> Searching cell in DL EARFCN=1750, f_dl=1860.0 MHz, f_ul=1765.0 MHz
> 11:40:03.766923 [PHY0] Info    [00000] SYNC:  Starting RX streaming
> 11:40:03.767122 [PHY0] Info    [00000] SYNC:  Searching for cell...
> .
> 11:40:03.946759 [PHY0] Info    [00000] SYNC:  PSS/SSS detected: PCI=80,
> CFO=3.7 KHz, CP=Normal
> 11:40:03.956922 [PHY0] Info    [00000] SYNC:  Stopping RX streaming
> Found Cell:  PCI=80, PRB=100, Ports=2, CFO=3.6 KHz
> 11:40:03.957225 [PHY0] Info    [00000] SYNC:  MIB Decoded: PCI=80,
> PRB=100, Ports=2, CFO=3.6 KHz
> 11:40:03.963473 [PHY0] Info    [00000] SYNC:  Setting sampling rate 23.04
> MHz
> 11:40:04.415771 [PHY0] Info    [00000] SYNC:  Starting RX streaming
> 11:40:04.416024 [PHY0] Info    [00000] SYNC:  Starting SFN synchronization
> 11:40:04.525941 [PHY0] Info    [00000] SYNC:  Trying to decode MIB...
> SNR=-nan dB
> 11:40:04.535976 [PHY0] Info    [00000] SYNC:  Trying to decode MIB...
> SNR=15.4 dB
> 11:40:04.545921 [PHY0] Info    [00000] SYNC:  Trying to decode MIB...
> SNR=16.4 dB
> 11:40:04.555973 [PHY0] Info    [00000] SYNC:  Trying to decode MIB...
> SNR=17.4 dB
> 11:40:04.556159 [PHY0] Info    [00000] SYNC:  DONE, TTI=1400, sfn_offset=0
> 11:40:04.557021 [PHY0] Info    [01401] SYNC:  Measuring RSRP 1/5,
> sf_idx=1, RSRP=4.6 dBm, SNR=17.5 dB
> 11:40:04.558060 [PHY0] Info    [01402] SYNC:  Measuring RSRP 2/5,
> sf_idx=2, RSRP=4.5 dBm, SNR=17.2 dB
> 11:40:04.559009 [PHY0] Info    [01403] SYNC:  Measuring RSRP 3/5,
> sf_idx=3, RSRP=4.5 dBm, SNR=17.6 dB
> 11:40:04.559961 [PHY0] Info    [01404] SYNC:  Measuring RSRP 4/5,
> sf_idx=4, RSRP=4.5 dBm, SNR=16.9 dB
> 11:40:04.561143 [PHY0] Info    [01405] SYNC:  Measuring RSRP 5/5,
> sf_idx=5, RSRP=4.3 dBm, SNR=16.0 dB
> 11:40:04.561147 [PHY0] Info    [01405] SYNC:  Measured OK. Camping on cell
> PCI=80...
> 11:40:04.561154 [RRC ] Info    New Cell: PCI=80, PRB=100, Ports=2,
> EARFCN=1750, RSRP=4.5 dBm
> 11:40:04.561898 [MAC ] Info    [00000] SCHED: Searching for DL grant for
> SI-RNTI window_st=1425, window_len=1
> 11:40:04.563781 [MAC ] Info    [01409] BSR:   Configured timer reTX 2560 ms
> 11:40:04.563793 [MAC ] Info    [01409] BSR:   QUEUE status: 0 (0), 0 (0),
> 0 (0), 0 (0), 0 (0), 0 (0),
> 11:40:04.581205 [PHY1] Info    [01425] PDCCH: DL DCI Format1A cce_index=
> 0, L=4, n_data_bits=28, hex=[c3 80 60 40 ]
> 11:40:04.581251 [PHY1] Info    [01425] PDSCH: l_crb= 5, harq=0, snr=17.1
> dB, TB0: tbs=22, mcs=0, rv=1, crc=OK, it=1, dec_time=  29 us
> 11:40:04.581261 [RLC ] Info    BCCH TXSCH message received.
>              0000: 68 40 04 03 00 01 00 06 60 19 14 6a 10 88 10 80
>              0010: 16 11 3d 2a 00 00
> 11:40:04.581273 [RRC ] Info    BCCH DLSCH message received.
>              0000: 68 40 04 03 00 01 00 06 60 19 14 6a 10 88 10 80
>              0010: 16 11 3d 2a 00 00
> 11:40:04.581278 [RRC ] Info    BCCH DLSCH message Stack latency: 6 us
> 11:40:04.581287 [RRC ] Warning [ASN]: Detected an extension in RRC
> function: liblte_rrc_unpack_sys_info_block_type_1_msg
> 11:40:04.581291 [RRC ] Info    SIB1 received, CellID=1537, si_window=10,
> sib2_period=16
> Found PLMN:  Id=00101, TAC=1
> 11:40:04.581299 [NAS ] Info    Found PLMN:  Id=00101, TAC=1
> 11:40:04.581307 [RRC ] Info    PLMN Id=00101 selected
> Select cell: PCI=80, EARFCN=1750, Cell ID=0x6601
> 11:40:04.581310 [RRC ] Info    Selecting cell PCI=80, EARFCN=1750, Cell
> ID=0x6601
> 11:40:04.581317 [PHY0] Info    [01425] Cell Select: Already in cell
> EARFCN=1750
> 11:40:04.581321 [MAC ] Info    [01426] DL 8 (TB 0):  newTX tbs=22, rv=1,
> ack=OK, ndi=0 (0), tti=1425 (0)
> 11:40:04.591978 [MAC ] Info    [01437] SCHED: Searching for DL grant for
> SI-RNTI window_st=1440, window_len=10
> 11:40:04.597041 [PHY1] Info    [01441] PDCCH: DL DCI Format1A cce_index=
> 0, L=4, n_data_bits=28, hex=[c4 48 40 90 ]
> 11:40:04.597090 [PHY1] Info    [01441] PDSCH: l_crb= 6, harq=0, snr=18.1
> dB, TB0: tbs=26, mcs=0, rv=2, crc=OK, it=1, dec_time=  33 us
> 11:40:04.597098 [RLC ] Info    BCCH TXSCH message received.
>              0000: 00 00 03 55 fd 8c 98 00 d8 1e 22 08 20 04 10 00
>              0010: 12 09 45 8a 2b 46 e8 00 05 00
> 11:40:04.597110 [RRC ] Info    BCCH DLSCH message received.
>              0000: 00 00 03 55 fd 8c 98 00 d8 1e 22 08 20 04 10 00
>              0010: 12 09 45 8a 2b 46 e8 00 05 00
> 11:40:04.597118 [RRC ] Info    BCCH DLSCH message Stack latency: 9 us
> 11:40:04.597128 [RRC ] Info    SIB2 received
> 11:40:04.597131 [RRC ] Info    Set RACH ConfigCommon: NofPreambles=16,
> ResponseWindow=10, ContentionResolutionTimer=48 ms
> 11:40:04.597137 [PHY0] Info    [01441] PHY:   Configuring UL parameters
> 11:40:04.597143 [PHY0] Info    [01441] Setting new params worker_id=0,
> pregen_disabled=0
> 11:40:04.597147 [PHY1] Info    [01441] Setting new params worker_id=1,
> pregen_disabled=0
> 11:40:04.597151 [PHY2] Info    [00000] Setting new params worker_id=2,
> pregen_disabled=0
> 11:40:04.597156 [RRC ] Info    Set PUSCH ConfigCommon: HopOffset=16,
> RSGroup=0, RSNcs=0, N_sb=1
> 11:40:04.597159 [RRC ] Info    Set PUCCH ConfigCommon: DeltaShift=2,
> CyclicShift=0, N1=0, NRB=2
> 11:40:04.597162 [RRC ] Info    Set PRACH ConfigCommon: SeqIdx=384, HS=no,
> FreqOffset=7, ZC=12, ConfigIndex=3
> 11:40:04.597164 [RRC ] Info    Set SRS ConfigCommon: BW-Configuration=2,
> SF-Configuration=0, ACKNACK=yes
> 11:40:04.597168 [RRC ] Info    Set Constants and Timers: N310=1, N311=1,
> t301=400, t310=1000, t311=1000
> 11:40:04.597174 [MAC ] Info    [01442] DL 8 (TB 0):  newTX tbs=26, rv=2,
> ack=OK, ndi=0 (0), tti=1441 (0)
> 11:40:04.598001 [RRC ] Info    RRC Cell Selected: Sending connection
> request...
> 11:40:04.598011 [RRC ] Info    Sending RRC Connection Request on SRB0
> 11:40:04.598015 [PDCP] Info    TX SRB0 SDU, do_security = false
>              0000: 50 00 00 00 3e 86
> 11:40:04.598020 [RLC ] Info    SRB0 Tx SDU
>              0000: 50 00 00 00 3e 86
> 11:40:04.598788 [MAC ] Info    [01444] SR:    PUCCH not configured.
> Starting RA procedure
> 11:40:04.598797 [MAC ] Info    [01444] RA:    INIT:   Starting PRACH by
> MAC order
> 11:40:04.598802 [PHY0] Info    [01443] PRACH: configIdx=3,
> rootSequence=384, zeroCorrelationConfig=12, freqOffset=7
> 11:40:04.613734 [PHY0] Info    [01457] PRACH: Transmitted preamble=1,
> CFO=2.82 KHz, tx_time=0.956863
> Random Access Transmission: seq=1, ra-rnti=0x2
> 11:40:04.614175 [MAC ] Info    [01458] RA:    PDCCH:  seq=1, ra-rnti=0x2,
> ra-tti=1461
> 11:40:04.622110 [PHY0] Info    [01466] PDCCH: DL DCI Format1A cce_index=
> 0, L=4, n_data_bits=28, hex=[c1 f0 10 00 ]
> 11:40:04.622153 [PHY0] Info    [01466] PDSCH: l_crb= 3, harq=0, snr=18.1
> dB, TB0: tbs=7, mcs=0, rv=0, crc=OK, it=1, dec_time=  21 us
> 11:40:04.622167 [PHY0] Info    [01466] PHY:   Set TA RAR: ta_cmd: 2, n_ta:
> 32, ta_usec: 1.0
> 11:40:04.622172 [MAC ] Info    [01467] RA:    Rx:     RAPID=1, TA=2
> 11:40:04.624112 [RLC ] Info    SRB0 Complete SDU scheduled for tx. Stack
> latency: 26100 us
> 11:40:04.624118 [RLC ] Info    TX SRB0, Transparent Mode PDU
>              0000: 50 00 00 00 3e 86
> 11:40:04.624124 [MAC ] Info    [01468] SDU:   allocated lcid=0,
> rlc_buffer=6, allocated=6/10, max_sdu_sz=-1, remaining=4
> 11:40:04.624127 [MAC ] Info    [01468] BSR:   Type Padding, Format Long,
> Value=0,0,0,0
> 11:40:04.624132 [MAC ] Info    [01468] UL 0:  New TX for Msg3, RV=0,
> TBS=11, RNTI=43768
> 11:40:04.624253 [PHY0] Info    [01468] PUSCH: tti_tx=1472, alloc=(18,22),
> tbs=11, mcs=0, rv=0, ack=no, ri=no, cfo=2.9 KHz, tot_time= 401 us
> 11:40:04.632062 [PHY0] Info    [01476] PHICH: hi=0, I_lowest=18, n_dmrs=0
> 11:40:04.632074 [MAC ] Info    [01476] UL 0:  HARQ = NACK for UL
> transmission
> 11:40:04.632083 [MAC ] Info    [01476] UL 0:  Non-Adaptive retx=1, RV=2,
> TBS=11
> 11:40:04.632205 [PHY0] Info    [01476] PUSCH: tti_tx=1480, alloc=(18,22),
> tbs=11, mcs=0, rv=2, ack=no, ri=no, cfo=3.0 KHz, tot_time= 412 us
> 11:40:04.640155 [PHY1] Info    [01484] PHICH: hi=0, I_lowest=18, n_dmrs=0
> 11:40:04.640167 [MAC ] Info    [01484] UL 0:  HARQ = NACK for UL
> transmission
> 11:40:04.640174 [MAC ] Info    [01484] UL 0:  Non-Adaptive retx=2, RV=3,
> TBS=11
> 11:40:04.640285 [PHY1] Info    [01484] PUSCH: tti_tx=1488, alloc=(18,22),
> tbs=11, mcs=0, rv=3, ack=no, ri=no, cfo=3.0 KHz, tot_time= 380 us
> 11:40:04.648090 [PHY2] Info    [01492] PHICH: hi=0, I_lowest=18, n_dmrs=0
> 11:40:04.648104 [MAC ] Info    [01492] UL 0:  HARQ = NACK for UL
> transmission
> 11:40:04.648118 [MAC ] Info    [01492] UL 0:  Non-Adaptive retx=3, RV=1,
> TBS=11
> 11:40:04.648235 [PHY2] Info    [01492] PUSCH: tti_tx=1496, alloc=(18,22),
> tbs=11, mcs=0, rv=1, ack=no, ri=no, cfo=3.1 KHz, tot_time= 407 us
> 11:40:04.656198 [PHY0] Info    [01500] PHICH: hi=0, I_lowest=18, n_dmrs=0
> 11:40:04.656214 [MAC ] Info    [01500] UL 0:  HARQ = NACK for UL
> transmission
> 11:40:04.656223 [MAC ] Info    [01500] UL 0:  Non-Adaptive retx=4, RV=0,
> TBS=11
> 11:40:04.656351 [PHY0] Info    [01500] PUSCH: tti_tx=1504, alloc=(18,22),
> tbs=11, mcs=0, rv=0, ack=no, ri=no, cfo=3.1 KHz, tot_time= 430 us
> 11:40:04.664106 [PHY1] Info    [01508] PHICH: hi=1, I_lowest=18, n_dmrs=0
> 11:40:04.664119 [MAC ] Info    [01508] UL 0:  HARQ = ACK for UL
> transmission. Discarting TB.
> 11:40:04.703435 [MAC ] Info    [01548] RA:    ConRes: Contention
> Resolution Timer expired. Stopping PDCCH Search and going to Response Error
> srsue: /usr/include/boost/smart_ptr/intrusive_ptr.hpp:174: T*
> boost::intrusive_ptr<T>::operator->() const [with T =
> uhd::transport::managed_send_buffer]: Assertion `px != 0' failed.
> srsue: /usr/include/boost/smart_ptr/intrusive_ptr.hpp:174: T*
> boost::intrusive_ptr<T>::operator->() const [with T =
> uhd::transport::managed_send_buffer]: Assertion `px != 0' failed.
> Aborted (core dumped)
>
>
> And here the backtrace from gdb:
>
> #0  0x00007ffff6066428 in __GI_raise (sig=sig at entry=6)
>     at ../sysdeps/unix/sysv/linux/raise.c:54
> #1  0x00007ffff606802a in __GI_abort () at abort.c:89
> #2  0x00007ffff605ebd7 in __assert_fail_base (fmt=<optimized out>,
>     assertion=assertion at entry=0x7ffff5c3ae31 "px != 0",
>     file=file at entry=0x7ffff5c755b0
> "/usr/include/boost/smart_ptr/intrusive_ptr.hpp", line=line at entry=174,
>     function=function at entry=0x7ffff5ca7280 "T*
> boost::intrusive_ptr<T>::operator->() const [with T =
> uhd::transport::managed_send_buffer]") at assert.c:92
> #3  0x00007ffff605ec82 in __GI___assert_fail (
>     assertion=0x7ffff5c3ae31 "px != 0",
>     file=0x7ffff5c755b0 "/usr/include/boost/smart_ptr/intrusive_ptr.hpp",
>     line=174,
>     function=0x7ffff5ca7280 "T* boost::intrusive_ptr<T>::operator->()
> const [with T = uhd::transport::managed_send_buffer]") at assert.c:101
> #4  0x00007ffff5a4a973 in ?? () from
> /usr/lib/x86_64-linux-gnu/libuhd.so.003
> #5  0x00007ffff5c29a93 in ?? () from
> /usr/lib/x86_64-linux-gnu/libuhd.so.003
> #6  0x00007ffff491f5d5 in ?? ()
>    from /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.58.0
> #7  0x00007ffff7bc16ba in start_thread (arg=0x7fffca28c700)
>     at pthread_create.c:333
> #8  0x00007ffff61383dd in clone ()
>     at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
>
>
> Thank you again for the support.
>
>
>
>
> 2017-10-27 8:39 GMT+02:00 Ismael Gomez <
> ismael.gomez at softwareradiosystems.com>:
>
>> Can you run with log level info and filename=stdout please? This will fw
>> the log to stdout instead of a file so that we are able to see what
>> happened just before segfault. Also, can you run it with gdb and send us
>> the backtrace?
>>
>> Thanks
>>
>> El jue., 26 oct. 2017 17:27, Lanfranco Zanzi <lanfranco.zanzi at gmail.com>
>> escribió:
>>
>>> Hi Andre,
>>>
>>> thank you for your reply.
>>> I saw what Ismael suggested, and i used it as starting point for my
>>> setup. The desktop PC should satisfy the requirements and 3 physical
>>> threads are already running. However, the setting "otw_format=sc12" leads
>>> in my case to core dumped failure:
>>>
>>> linux; GNU C++ version 5.3.1 20151219; Boost_105800; UHD_003.009.002-0-unknown
>>>
>>> Reading configuration file ue.conf.example...
>>> ---  Software Radio Systems LTE UE  ---
>>>
>>> Opening RF device with 2 RX antennas...
>>> Using Volk machine: avx2_64_mmx_orc
>>> Opening USRP with args: otw_format=sc12
>>> -- 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 16.000000 MHz...
>>> -- Actually got clock rate 16.000000 MHz.
>>> -- Performing timer loopback test... pass
>>> -- Performing timer loopback test... pass
>>> -- Setting master clock rate selection to 'automatic'.
>>> -- Asking for clock rate 48.000000 MHz...
>>> -- Actually got clock rate 48.000000 MHz.
>>> -- Performing timer loopback test... pass
>>> -- Performing timer loopback test... pass
>>> -- Asking for clock rate 61.440000 MHz...
>>> -- Actually got clock rate 61.440000 MHz.
>>> -- Performing timer loopback test... pass
>>> -- Performing timer loopback test... pass
>>> -- Asking for clock rate 30.720000 MHz...
>>> -- Actually got clock rate 30.720000 MHz.
>>> -- Performing timer loopback test... pass
>>> -- Performing timer loopback test... pass
>>> Waiting PHY to initialize...
>>> ...
>>> Searching cell in DL EARFCN=1700, f_dl=1855.0 MHz, f_ul=1760.0 MHz
>>> .
>>> Found Cell:  PCI=80, PRB=100, Ports=2, CFO=3.3 KHz
>>> Found PLMN:  Id=00101, TAC=1
>>> Select cell: PCI=80, EARFCN=1700, Cell ID=0x6601
>>> Random Access Transmission: seq=1, ra-rnti=0x2
>>> srsue: /usr/include/boost/smart_ptr/intrusive_ptr.hpp:174: T* boost::intrusive_ptr<T>::operator->() const [with T = uhd::transport::managed_send_buffer]: Assertion `px != 0' failed.
>>> srsue: /usr/include/boost/smart_ptr/intrusive_ptr.hpp:174: T* boost::intrusive_ptr<T>::operator->() const [with T = uhd::transport::managed_send_buffer]: Assertion `px != 0' failed.
>>> Aborted (core dumped)
>>>
>>>
>>>
>>> Am i missing something?
>>>
>>> Thank you again
>>>
>>>
>>>
>>>
>>>
>>> 2017-10-25 14:40 GMT+02:00 Andre Puschmann <
>>> andre.puschmann at softwareradiosystems.com>:
>>>
>>>> Hi,
>>>>
>>>> there seems to be an issue with receiving from the USRP as well, see
>>>> logs for overflow warning.
>>>>
>>>> Have you tried what Ismael suggested a few days ago to Andres? Also, if
>>>> you have the possibility, you could try to reduce the bandwidth of the
>>>> cell to 15 or 10 MHz to lower the processing load for the UE.
>>>>
>>>> Cheers
>>>> Andre
>>>>
>>>>
>>>> On 23/10/17 17:20, Lanfranco Zanzi wrote:
>>>> > Hi all,
>>>> >
>>>> > we are facing some problem during the attach procedure of our USRP
>>>> b210
>>>> > with a commercial LTE base station. We want to try the new srsLTE
>>>> > release and test it over a 2x2 MIMO setup.
>>>> >
>>>> > As you can see from the logs attached, the procedure starts correctly,
>>>> > but it does not complete due to "Timer T310 expired: Radio Link
>>>> Failure".
>>>> > I'm not an expert  user of srsLTE, but i do not see any issue from the
>>>> > logs, except for some " Sync error. Sending out-of-sync to RRC".
>>>> > The software is running on a powerful desktop PC (quad core i7
>>>> 4.4Ghz),
>>>> > and the basic ue.conf file has been modified only for 2 receiving
>>>> > antennas and 3 physical threads.
>>>> >
>>>> > Could the out-of-sync issue be the main problem, and how can i try to
>>>> > fix it?
>>>> > Other devices such as mobile phone or USB dongles perfectly attach,
>>>> so i
>>>> > would exclude incorrect configuration in the base station.
>>>> >
>>>> > Thank you in advance.
>>>> >
>>>> >
>>>> > _______________________________________________
>>>> > srslte-users mailing list
>>>> > srslte-users at lists.softwareradiosystems.com
>>>> > http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>> >
>>>>
>>>>
>>> _______________________________________________
>>> srslte-users mailing list
>>> srslte-users at lists.softwareradiosystems.com
>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20171031/5e36793e/attachment.htm>