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

[Andre Puschmann]

Hi,

there are many lates and underflows on the eNB console. They are very
likely messing up the transmitted signal. Please make sure you are
configuring frequency scaling accordingly and use a potent enough CPU.

Once you fixed those, please try again the UE. In case it still doesn't
work, please send the ue.log.

Hope that helps!

Cheers
Andre



On 16/11/17 01:19, Spencer Sevilla wrote:
> 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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