[srslte-users] radios don't hear each other

[Spencer Sevilla]

Hi all,

I'm trying to get a very very basic testbed setup, but no matter what I 
do, srsue and srsenb don't want to talk to each other. Here's my setup 
and logs:

eNB:

Running Ubuntu 17.04, hardware is a USRP B200, local EPC based on OAI 
(openair-cn). I'm just using the standard sample config files, 
{enb,rr,drb,sib}.conf.example. Terminal output for starting the eNB is 
as follows:

spencer at spencertower:~/Desktop/srsLTE$ sudo ./build/srsenb/src/srsenb enb.conf
linux; GNU C++ version 6.3.0 20170406; Boost_106200; UHD_003.010.002.000-3-g122bfae1

---  Software Radio Systems LTE eNodeB  ---

Reading configuration file enb.conf...
Opening USRP with args: type=b200,master_clock_rate=30.72e6
-- Detected Device: B200
-- Operating over USB 3.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 30.720000 MHz...
-- Actually got clock rate 30.720000 MHz.
-- Performing timer loopback test... pass
Setting frequency: DL=2630.0 Mhz, UL=2510.0 MHz
-- Asking for clock rate 23.040000 MHz...
-- Actually got clock rate 23.040000 MHz.
-- Performing timer loopback test... pass
Setting Sampling frequency 5.76 MHz

==== eNodeB started ===
Type <t> to view trace
t
Enter t to stop trace.
ULULLLLLLLLLLLLLLLLULLLLLLLLLLLLLLLL^C^C^CU^C^C^C---  exiting  ---


Once the "eNodeB started" comes up, I can see both green and red lights 
(TX and RX) on the SDR stay constantly lit. This goes on for about a 
minute until I control-C.


UE:

Running Ubuntu 17.04, hardware is a USRP B210. Again, I'm just using the 
standard sample config file ue.conf.example. Terminal output for the UE 
(which I starts after the eNB) is as follows:

Reading configuration file ./srsue/ue.conf.example...
---  Software Radio Systems LTE UE  ---

Opening RF device with 1 RX antennas...
Opening USRP with args: type=b200,master_clock_rate=30.72e6
-- 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 30.720000 MHz...
-- Actually got clock rate 30.720000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
Waiting PHY to initialize...
...
Searching cell in DL EARFCN=2850, f_dl=2630.0 MHz, f_ul=2510.0 MHz
...........................................................
RRC PLMN Search: timeout expired. Searching again
...........................................................
RRC PLMN Search: timeout expired. Searching again
..........................................................
RRC PLMN Search: timeout expired. Searching again
..................................................^C---  exiting  ---


After it boots, it just keeps searching for the PLMN (with the green 
light on the SDR blinking to indicate RX) to no avail; this goes on 
until I control-C.

I double-checked the clock-rates, and made sure that downlink and uplink 
frequencies are the same (2630.0 MHz  and 2510.0 MHz, respectively). I 
was also able to get the exact same behavior using the OAI eNodeB, so 
I'm sure I'm doing something wrong here. Any thoughts/wisdom/advice? Are 
there good other things for me to look into, or to make sure I'm doing 
right? Any great way to debug the SDRs and make sure they're doing what 
they're supposed to? I'd appreciate any advice or leads anyone might 
have, cause I'm pretty stumped at the moment.

Thanks!!!
Spencer
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