[srslte-users] Switched from Nuand BladeRF to Ettus B200 and was able to register with T-Mobile!

[Keith E. Fleming]

So I don't know if it's the increased sample rate of the B200, but things just seemed to start working better once I recompiled with UHD support. This isn't a putdown of the Nuand. I think real-time decoding of LTE is one of the hardest tasks an SDR can do.
Using one of my employer's SIMs, and knowing the Ki and OPc, I was able to successfully attach and get assigned an IP address

There are a few lingering errors, notably:
1. Reserved codebook index2. Error predecoding multiplex: not implemented for 4 Tx ports
Overall, I am happy :) 

Opening 1 channels in RF device=default with args=default[INFO] [UHD] linux; GNU C++ version 10.2.1 20201207; Boost_107400; UHD_3.15.0.0-4+b1
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [B200] Detected Device: B200
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[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.
Waiting PHY to initialize ... done!
Attaching UE...
.
Found Cell:  Mode=FDD, PCI=211, PRB=25, Ports=4, CFO=1.6 KHz
Found PLMN:  Id=310260, TAC=30587
Found PLMN:  Id=311490, TAC=30587
Could not find Home PLMN Id=310690, trying to connect to PLMN Id=310260
Random Access Transmission: seq=11, tti=4517, ra-rnti=0x8
RRC Connected
Random Access Complete.     c-rnti=0x581b, ta=34
/home/keith/srsRAN/lib/src/phy/phch/ra_dl.c.529: Reserved codebook index (nof_tb=2, pinfo=18)
/home/keith/srsRAN/lib/src/phy/phch/ra_dl.c.592: Configuring MIMO PMI
Received RRC Connection Release (releaseCause: other)
RRC IDLE
Attach failed (attempt 1/5)
.
Found Cell:  Mode=FDD, PCI=211, PRB=25, Ports=4, CFO=1.8 KHz
Found PLMN:  Id=310260, TAC=30587
Found PLMN:  Id=311490, TAC=30587
Could not find Home PLMN Id=310690, trying to connect to PLMN Id=310260
Random Access Transmission: seq=28, tti=9157, ra-rnti=0x8
RRC Connected
Random Access Complete.     c-rnti=0x1f21, ta=35
/home/keith/srsRAN/lib/src/phy/phch/ra_dl.c.529: Reserved codebook index (nof_tb=2, pinfo=48)
/home/keith/srsRAN/lib/src/phy/phch/ra_dl.c.592: Configuring MIMO PMI
Network attach successful. IP: 10.4.5.7
 14/9/2021 21:6:28 TZ:105
/home/keith/srsRAN/lib/src/phy/mimo/precoding.c.1853: Error predecoding multiplex: not implemented for 4 Tx ports
/home/keith/srsRAN/lib/src/phy/phch/pdsch.c.880: Error predecoding
/home/keith/srsRAN/lib/src/phy/phch/ra_dl.c.529: Reserved codebook index (nof_tb=2, pinfo=24)
/home/keith/srsRAN/lib/src/phy/phch/ra_dl.c.592: Configuring MIMO PMI
/home/keith/srsRAN/lib/src/phy/mimo/precoding.c.1853: Error predecoding multiplex: not implemented for 4 Tx ports
/home/keith/srsRAN/lib/src/phy/phch/pdsch.c.880: Error predecoding
/home/keith/srsRAN/lib/src/phy/mimo/precoding.c.1853: Error predecoding multiplex: not implemented for 4 Tx ports
/home/keith/srsRAN/lib/src/phy/phch/pdsch.c.880: Error predecoding


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