[srslte-users] Problems in executing srsUE in the CA environment with USRP X310 (changing srate)

[Sangwook Bae]

Hi, all

I've got the following problems in executing the CA environment with USRP
X310.
When I execute the srsUE, It gives the following error. (Multiple sampling
rates upstream of RX)
Is there any solution or starting point to fix it out?

AFAIK, the sampling rate in the X series could not be changed once it
configured.
What I am confusing is that, for UE, it is inevitable for changing the
sampling rate.
Meaning that, when the UE doing a cell search, it needs to configure its
state to 1.92Mhz.
Then, after it finds the cell, the UE will change its state to the cell's
sampling rate accordingly.
Therefore, I think that this problem (in X series) seems inevitable.
What do you think? Please let me know if I missed something.

Following is what I saw on my machine when I executed srsUE.

With best regards.
Sangwook

================================

Opening 2 channels in RF device=default with args=default
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501;
UHD_3.15.0.0-release
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=2, args: type=x300,master_clock_rate=184.32e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Maximum frame size: 8000 bytes.
[INFO] [X300] Radio 1x clock: 184.32 MHz
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929a
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1319 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1323 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [MULTI_USRP]     1) catch time transition at pps edge
[INFO] [MULTI_USRP]     2) set times next pps (synchronously)
Waiting PHY to initialize ... done!
Attaching UE...
Found Cell:  Mode=FDD, PCI=157, PRB=100, Ports=2, CFO=0.7 KHz
/srsRAN/lib/src/phy/rf/rf_uhd_imp.cc.1047: USRP reported the following
error: RuntimeError: Multiple sampling rates upstream of RX Terminator 0:
RuntimeError: Node 0/DDC_0 specifies 2.304e+07, node 0/DDC_1 specifies
1.92e+06.

-- 
Sangwook Bae
Korea Advanced Institute of Science and Technology
Homepage: https://sites.google.com/site/sangwookbae89
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