[srsran-users] NSA COTS UE stops broadcasting signal when adding NR Cell

Robert Falkenberg robert.falkenberg at srs.io
Thu Aug 25 18:03:34 UTC 2022 

Hi Cristina,

The USRP B210 cannot tune RF A and RF B independently; they are bound as 
follows: ftx1 = ftx2 and frx1 = frx2.
Consequently, you cannot create the two required cells with USRP B210. 
For 5G NSA, we recommend USRP X310.

I have attached an older thread on that topic for reference.

Best regards,
Robert

On 25.08.22 11:58, Cristina Posada wrote:
>
> Hello all!
>
> I have a problem configuring the 5G NSA COTS UE following this guide 
> https://docs.srsran.com/en/latest/app_notes/source/5g_nsa_cots/source/index.html
>
> If I *remove* the *nr_cell* section from the rr.conf file, the UE can 
> attach the LTE network and connects just fine. But if I *add* the 
> *nr_cell* to the rr.conf The UE is not even able to see the 5G NSA 
> network in the list of network operators.
>
> I'm using an USRP B210 and last srsRAN version
> Ubuntu 20.04.4 LTS 1th Gen Intel® Core™ i7-1165G7 @ 2.80GHz × 8
>
>   * I already have the CPU governor of the PC at performance mode
>   * The TX/RX LED's on both ports are not blinking
>   * The USRP B210 has external power supply and 2 antennas (one in
>     TX/RX of RF A an other in TX/RX of RF B)
>
> srsepc output
>
> |Built in Release mode using commit ce8a3cae1 on branch master. --- 
> Software Radio Systems EPC --- Reading configuration file epc.conf... 
> HSS Initialized. MME S11 Initialized MME GTP-C Initialized MME 
> Initialized. MCC: 0xf001, MNC: 0xff01 SPGW GTP-U Initialized. SPGW S11 
> Initialized. SP-GW Initialized. Received S1 Setup Request. S1 Setup 
> Request - eNB Name: srsenb01, eNB id: 0x19b S1 Setup Request - 
> MCC:001, MNC:01 S1 Setup Request - TAC 7, B-PLMN 0xf110 S1 Setup 
> Request - Paging DRX v128 Sending S1 Setup Response|
> |
>
> srsenb output
>
> |Active RF plugins: libsrsran_rf_uhd.so libsrsran_rf_blade.so 
> libsrsran_rf_zmq.so Inactive RF plugins: --- Software Radio Systems 
> LTE eNodeB --- Reading configuration file enb.conf... Built in Release 
> mode using commit ce8a3cae1 on branch master. Opening 2 channels in RF 
> device=uhd with args=clock=gpsdo Supported RF device list: UHD bladeRF 
> zmq file [INFO] [UHD] linux; GNU C++ version 9.4.0; Boost_107100; 
> UHD_4.2.0.0-0ubuntu1~focal1 [INFO] [LOGGING] Fastpath logging disabled 
> at runtime. Opening USRP channels=2, args: 
> type=b200,master_clock_rate=23.04e6 [INFO] [UHD RF] RF UHD Generic 
> instance constructed [INFO] [B200] Detected Device: B210 [INFO] [B200] 
> Operating over USB 3. [INFO] [B200] Detecting internal GPSDO.... 
> [INFO] [GPS] Found an internal GPSDO: GPSTCXO , Firmware Rev 0.929a 
> [INFO] [B200] Initialize CODEC control... [INFO] [B200] Initialize 
> Radio control... [INFO] [B200] Performing register loopback test... 
> [INFO] [B200] Register loopback test passed [INFO] [B200] Performing 
> register loopback test... [INFO] [B200] Register loopback test passed 
> [INFO] [B200] Asking for clock rate 23.040000 MHz... [INFO] [B200] 
> Actually got clock rate 23.040000 MHz. Setting USRP time to 
> 1661342201.000000s [INFO] [MULTI_USRP] 1) catch time transition at pps 
> edge [INFO] [MULTI_USRP] 2) set times next pps (synchronously) ==== 
> eNodeB started === Type <t> to view trace Setting manual TX/RX offset 
> to 100 samples Setting frequency: DL=806.0 Mhz, UL=847.0 MHz for 
> cc_idx=0 nof_prb=50 Setting frequency: DL=1842.5 Mhz, DL_SSB=1839.65 
> Mhz (SSB-ARFCN=367930), UL=1747.5 MHz for cc_idx=1 nof_prb=52|
> |
>
> uhd_usrp_probe
>
> |[INFO] [UHD] linux; GNU C++ version 9.4.0; Boost_107100; 
> UHD_4.2.0.0-0ubuntu1~focal1 [INFO] [B200] Detected Device: B210 [INFO] 
> [B200] Operating over USB 3. [INFO] [B200] Detecting internal 
> GPSDO.... [INFO] [GPS] Found an internal GPSDO: GPSTCXO , Firmware Rev 
> 0.929a [INFO] [B200] Initialize CODEC control... [INFO] [B200] 
> Initialize Radio control... [INFO] [B200] Performing register loopback 
> test... [INFO] [B200] Register loopback test passed [INFO] [B200] 
> Performing register loopback test... [INFO] [B200] Register loopback 
> test passed [INFO] [B200] Setting master clock rate selection to 
> 'automatic'. [INFO] [B200] Asking for clock rate 16.000000 MHz... 
> [INFO] [B200] Actually got clock rate 16.000000 MHz. 
> _____________________________________________________ / | Device: 
> B-Series Device | 
> _____________________________________________________ | / | | Mboard: 
> B210 | | serial: 30DCED4 | | name: MyB210 | | product: 2 | | revision: 
> 4 | | FW Version: 8.0 | | FPGA Version: 16.0 | | | | Time sources: 
> none, internal, external, gpsdo | | Clock sources: internal, external, 
> gpsdo | | Sensors: gps_gpgga, gps_gprmc, gps_time, gps_locked, 
> gps_servo, ref_locked | | 
> _____________________________________________________ | | / | | | RX 
> DSP: 0 | | | | | | Freq range: -8.000 to 8.000 MHz | | 
> _____________________________________________________ | | / | | | RX 
> DSP: 1 | | | | | | Freq range: -8.000 to 8.000 MHz | | 
> _____________________________________________________ | | / | | | RX 
> Dboard: A | | | _____________________________________________________ 
> | | | / | | | | RX Frontend: A | | | | Name: FE-RX2 | | | | Antennas: 
> TX/RX, RX2 | | | | Sensors: temp, rssi, lo_locked | | | | Freq range: 
> 50.000 to 6000.000 MHz | | | | Gain range PGA: 0.0 to 76.0 step 1.0 dB 
> | | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz | | | | 
> Connection Type: IQ | | | | Uses LO offset: No | | | 
> _____________________________________________________ | | | / | | | | 
> RX Frontend: B | | | | Name: FE-RX1 | | | | Antennas: TX/RX, RX2 | | | 
> | Sensors: temp, rssi, lo_locked | | | | Freq range: 50.000 to 
> 6000.000 MHz | | | | Gain range PGA: 0.0 to 76.0 step 1.0 dB | | | | 
> Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz | | | | Connection 
> Type: IQ | | | | Uses LO offset: No | | | 
> _____________________________________________________ | | | / | | | | 
> RX Codec: A | | | | Name: B210 RX dual ADC | | | | Gain Elements: None 
> | | _____________________________________________________ | | / | | | 
> TX DSP: 0 | | | | | | Freq range: -8.000 to 8.000 MHz | | 
> _____________________________________________________ | | / | | | TX 
> DSP: 1 | | | | | | Freq range: -8.000 to 8.000 MHz | | 
> _____________________________________________________ | | / | | | TX 
> Dboard: A | | | _____________________________________________________ 
> | | | / | | | | TX Frontend: A | | | | Name: FE-TX2 | | | | Antennas: 
> TX/RX | | | | Sensors: temp, lo_locked | | | | Freq range: 50.000 to 
> 6000.000 MHz | | | | Gain range PGA: 0.0 to 89.8 step 0.2 dB | | | | 
> Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz | | | | Connection 
> Type: IQ | | | | Uses LO offset: No | | | 
> _____________________________________________________ | | | / | | | | 
> TX Frontend: B | | | | Name: FE-TX1 | | | | Antennas: TX/RX | | | | 
> Sensors: temp, lo_locked | | | | Freq range: 50.000 to 6000.000 MHz | 
> | | | Gain range PGA: 0.0 to 89.8 step 0.2 dB | | | | Bandwidth range: 
> 200000.0 to 56000000.0 step 0.0 Hz | | | | Connection Type: IQ | | | | 
> Uses LO offset: No | | | 
> _____________________________________________________ | | | / | | | | 
> TX Codec: A | | | | Name: B210 TX dual DAC | | | | Gain Elements: None ||
> |
>
> I attach my current configuration and the enb log
>
> Is it possible to generate a 5G NSA network with just a single USRP B210?
>
> Thank you very much!!
>
> ||
>
> _______________________________________________
> srsran-users mailing list
> srsran-users at lists.srsran.com
> https://lists.srsran.com/mailman/listinfo/srsran-users

-- 


      RobertFalkenberg

Senior Engineer

Software Radio Systems

	
	
	
	

	robert at srs.io <mailto:robert at srs.io>

	www.srs.io <//www.srs.io>

	Dortmund, Germany




	
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