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

Fri Nov 17 11:08:36 UTC 2017

 I too have the issue of a commercial handset will not even discover my srsENB instance. I started using a real-time kernel (Centos 7 3.10.0-693.2.2.rt56.623.el7.x86_64) and the underflow and "RF Warning Late" errors all went away. This is on an i5-7600k with 32gb memory. Make sure to use a real-time kernel and to have CPU scaling turned off in BIOS
   On Friday, November 17, 2017, 3:22:29 AM EST, Andre Puschmann <andre.puschmann at softwareradiosystems.com> wrote:  

 Hey Spencer,

looking at the issue again we think you may have other fundamental
issues with your setup there that let the UE not even find a cell. Make
sure you are using the right frequencies and gain settings on both
sides, the signal looks good and use pdsch_ue to verify the correct
reception first.

Cheers
Andre

On 16/11/17 19:43, Spencer Sevilla wrote:
> Thanks Andre! Im out of the office today but will try all these things
> and report back tomorrow morning. I know I've got a pretty powerful CPU
> here, so off the top of your head do you have any other potential
> configuration suggestions/parameters or good instuctional resources? I'm
> a bit new to SDR but know a lot about wireless communications, and am
> happy to get myself up to speed.
> 
> Thanks again!
> 
> Spencer
> 
> On 11/16/17 1:30 AM, Andre Puschmann wrote:
>> 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
>>>
>>>
>>> _______________________________________________
>>> srslte-users mailing list
>>> srslte-users at lists.softwareradiosystems.com
>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>
> 

-- 
Andre Puschmann

Software Radio Systems (SRS)
http://www.softwareradiosystems.com

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