[srslte-users] USRP B210 doesn't work with "2 ports, 100 PRBs"
Xavier Arteaga
xavier at softwareradiosystems.com
Tue Aug 4 12:56:29 UTC 2020
Hi Fan,
You need to tune a bit the RF device arguments.
First of all, samples are carried in a 16bit format by default and there
isn't enough bandwidth in USB3. So, you need to set the over-the-wire
format to 12 bit:
otw_format=sc12
You can try to make the link more stable with:
num_recv_frames=64,num_send_frames=64
Regards,
Xavier
On Tue, 4 Aug 2020 at 13:51, Fan Yi <fanyi at princeton.edu> wrote:
> 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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