[srslte-users] USRP B210 doesn't work with "2 ports, 100 PRBs"

Mon Aug 3 15:29:55 UTC 2020

Hi everyone,

I set the master_clock_rate to 30.72MHz, and B210 works with "2 ports,
15MHz".

For USRP B210, the Ettus website says "The clock rate can be set to any
value between 5 MHz and 61.44 MHz (or 30.72 MHz for dual-channel mode).",
which means that for 2-channel mode the sampling rate is at most 30.72MHz.
But srsENB uses both 2RX and 2TX simultaneously (full-duplex MIMO). I
cannot find any official documents explaining the master_clock_rate under
full-duplex MIMO mode, but intuitively speaking when there are four
channels sharing the bus, the sampling rate is at most 15.36MHz with B210.

Anyhow,* my question for srsLTE is*, have you tested running srsENB on USRP
B210 with  "2 ports, 20MHz"? Can you confirm if USRP B210 works with  "2
ports, 20MHz" or not?

Best,
Fan

On Fri, Jul 31, 2020 at 9:50 PM Fan Yi <fanyi at princeton.edu> wrote:

> Hi everyone,
>
> I am new to srsLTE and any help would be appreciated. I am trying to set
> up
> an LTE ENB with 2 ports and 100 PRBs. I have followed all steps described
> in
> the github page but UE cannot find any cell in the corresponding
> frequency.
>
> *Setup Details:*
> I am using Ubuntu 18.04, srsLTE release_20_04, and UHD release_03_09_07.
> The CPU of the ENB machine is Intel Core i5-7300U CPU @ 2.60GHz × 4.
> For hardware, I have tried both USRP B210 and USRP X310 as ENB with 2
> ports
> and 100 PRBs. They act differently but neither of them works. For the UE
> side, I
> use USRP B210 and run "pdsch_ue -f 2685000000" to test the ENB.
>
> *Issue Description: *
> USRP B210 works well with "2 ports, 50 PRBs" or "1 port, 100 PRBs". In
> these
> cases, the UE can find the cell and decode PBCH correctly. The TX LED on
> USRP
> is red, which means it is transmitting signals.
> When I set it to "2 ports, 75 PRBs",  the UE cannot find the cell and
> output "Could
> not find any cell in this frequency." But the TX LED on USRP is still red.
> And then after
> several seconds, the srsenb outputs an error "ERROR: timed out while
> receiving samples
> from UHD".
> When I set it to "2 ports, 100 PRBs",  the UE cannot find the cell and
> output "Could
> not find any cell in this frequency." The TX LED on USRP only blink red
> lights once
> around every 10 seconds. And then after around 1 hour , the srsenb outputs
> an error
> "ERROR: timed out while receiving samples from UHD".
>
> You can find blow the log files.
>
> ------------------------------------------------------------------------------------------------------------
> *"2 ports, 50 PRBs"  :*
> *sudo srsenb /etc/srslte/enb.conf*
> linux; GNU C++ version 7.5.0; Boost_106501; UHD_003.009.007-0-g50839059
>
> ---  Software Radio Systems LTE eNodeB  ---
>
> Reading configuration file /etc/srslte/enb.conf...
>
> Built in Release mode using commit e3e384821 on branch HEAD.
>
> Opening 2 channels in RF device=default with
> args=serial=31C0427,num_recv_frames=64,num_send_frames=64
> Opening USRP channels=2, args:
> serial=31C0427,num_recv_frames=64,num_send_frames=64,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
> --     1) catch time transition at pps edge
> --     2) set times next pps (synchronously)
>
> ==== eNodeB started ===
> Type <t> to view trace
> Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz for cc_idx=0
> ^CStopping ..
> ---  exiting  ---
>
>
>
> ------------------------------------------------------------------------------------------------------------
> *"2 ports, 50 PRBs"  :*
> *./lib/examples/pdsch_ue -f 2685000000 -a "serial=3199405"*
> linux; GNU C++ version 7.5.0; Boost_106501; UHD_003.009.007-0-g50839059
>
> Opening RF device with 1 RX antennas...
> Opening USRP channels=1, args: serial=3199405,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
> Starting AGC thread...
> Tunning receiver to 2685.000 MHz
> Searching for cell...
>  Found Cell_id:   0 FDD, CP: Normal  , DetectRatio= 0% PSR=0.00,
> Power=-inf dBm
> *Found Cell_id:   1 FDD, CP: Normal  , DetectRatio=100% PSR=7.85,
> Power=6.7 dBm
>  Found Cell_id:   0 FDD, CP: Normal  , DetectRatio= 0% PSR=0.00,
> Power=-inf dBm
> Decoding PBCH for cell 1 (N_id_2=1)
> Setting sampling rate 11.52 MHz
>  - Type:            FDD   7.4, FrameCnt: 0, State: 1
>  - PCI:             1
>  - Nof ports:       2
>  - CP:              Normal
>  - PRB:             50
>  - PHICH Length:    Normal
>  - PHICH Resources: 1/6
>  - SFN:             628
> Decoded MIB. SFN: 628, offset: 3
>           CFO: -733.72 Hz
>          RSRP: +43.9 dBm | +40.4 dBm
>           SNR: +25.9 dB
>            TM: 2
>            Rb:   0.03 /   0.14 /   0.36 Mbps (net/maximum/processing)
>    PDCCH-Miss:  0.00%
>    PDSCH-BLER:  0.00%
>          TB 0: mcs=2; tbs=144
>          TB 1: mcs=0; tbs=0
> Press enter maximum printing debug log of 1 subframe.
>
>           CFO: +12656.98 Hz
>          RSRP: +37.6 dBm | +33.3 dBm
>           SNR:  +2.3 dB
>            TM: 2
>            Rb:   0.04 /   0.14 /   0.03 Mbps (net/maximum/processing)
>    PDCCH-Miss: 43.64%
>    PDSCH-BLER:  0.49%
>          TB 0: mcs=2; tbs=144
>          TB 1: mcs=0; tbs=0
> Press enter maximum printing debug log of 1 subframe.
>
>
>
> ------------------------------------------------------------------------------------------------------------
> *"2 ports, 75 PRBs"  :*
> *sudo srsenb /etc/srslte/enb.conf *
> linux; GNU C++ version 7.5.0; Boost_106501; UHD_003.009.007-0-g50839059
>
> ---  Software Radio Systems LTE eNodeB  ---
>
> Reading configuration file /etc/srslte/enb.conf...
>
> Built in Release mode using commit e3e384821 on branch HEAD.
>
> Opening 2 channels in RF device=default with
> args=serial=31C0427,num_recv_frames=64,num_send_frames=64
> Opening USRP channels=2, args:
> serial=31C0427,num_recv_frames=64,num_send_frames=64,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
> --     1) catch time transition at pps edge
> --     2) set times next pps (synchronously)
>
> ==== eNodeB started ===
> Type <t> to view trace
> Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz for cc_idx=0
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> ^CStopping ..
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.1033: Error timed
> out while receiving samples from UHD.
>
> ---  exiting  ---
>
>
>
> ------------------------------------------------------------------------------------------------------------
> *"2 ports, 75 PRBs"  :*
> *./lib/examples/pdsch_ue -f 2685000000 -a "serial=3199405"*
> linux; GNU C++ version 7.5.0; Boost_106501; UHD_003.009.007-0-g50839059
>
> Opening RF device with 1 RX antennas...
> Opening USRP channels=1, args: serial=3199405,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
> Starting AGC thread...
> Tunning receiver to 2685.000 MHz
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 0 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 1 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 2 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 3 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 4 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
>
>
>
> ------------------------------------------------------------------------------------------------------------
> *"2 ports, 100 PRBs"  :*
> *sudo srsenb /etc/srslte/enb.conf *
> linux; GNU C++ version 7.5.0; Boost_106501; UHD_003.009.007-0-g50839059
>
> ---  Software Radio Systems LTE eNodeB  ---
>
> Reading configuration file /etc/srslte/enb.conf...
>
> Built in Release mode using commit e3e384821 on branch HEAD.
>
> Opening 2 channels in RF device=default with
> args=serial=31C0427,num_recv_frames=64,num_send_frames=64
> Opening USRP channels=2, args:
> serial=31C0427,num_recv_frames=64,num_send_frames=64,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
> --     1) catch time transition at pps edge
> --     2) set times next pps (synchronously)
>
> ==== eNodeB started ===
> Type <t> to view trace
> Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz for cc_idx=0
> ^CStopping ..
> ---  exiting  ---
>
>
>
> ------------------------------------------------------------------------------------------------------------
> *"2 ports, 100 PRBs"  :*
> *./lib/examples/pdsch_ue -f 2685000000 -a "serial=3199405"*
> linux; GNU C++ version 7.5.0; Boost_106501; UHD_003.009.007-0-g50839059
>
> Opening RF device with 1 RX antennas...
> Opening USRP channels=1, args: serial=3199405,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
> Starting AGC thread...
> Tunning receiver to 2685.000 MHz
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 0 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 1 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 2 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 3 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 4 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 5 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 6 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 7 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 8 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 9 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 10 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 11 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 12 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 13 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 14 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 15 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 16 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not find
> any cell in this frequency
>
> Cell not found after 17 trials. Trying again (Press Ctrl+C to exit)
> Searching for cell...
> ^CSIGINT received. Exiting...
> /home/pc6228/Fanyi/srsLTE/lib/src/phy/rf/rf_utils.c.207: Could not fin
>
> ------------------------------------------------------------------------------------------------------------
>
>
> I observe that no matter how I set the number of PRBs and ports, the
> master_clock_rate
> of B210 is always automatically set to 23.04e6, which theoretically is not
> sufficient for
> "2 ports, 100 PRBs". It requires a master_clock_rate of  at least 40e6.
> Is master_clock_rate the problem? Or if I change the master_clock_rate to
> a number
> larger than 40e6, will the problem be solved?
>
> Also, is this a compatibility problem of srsLTE software versions?
> *Please let me know if you have a proven working setting, where ENB is **2
> ports and 100 PRBs.*
>
> Please let me know if you need any necessary additional files.
>
> Thank you,
> Best,
> Fan Yi
>
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