[srslte-users] Building srsLTE on RasPi 4 Buster...

[cswiger at swigerco.com]

Had some luck with RPi4B srsLTE and a commercial UE, at least a  
glimmer of luck - after switching from dl_earfcn = 3451   ( 925.1MHz,  
in US ISM band )  to 2525 ( Band 5, 881.50Mhz)  -- the Samsung Galaxy  
S4-mini with sysmocom card actually finds the network now - altho it  
immediately drops out.

Hardware: Raspberry Pi 4 Model B Rev 1.1    ARMv7 Processor rev 3 (v7l)

LimeSDR - not the mini
LimeSuite  Library version: v19.04.1-g627c82c7

SoapySDR
commit 189bc69217846581e34456f391683cc07c43ae0d (HEAD -> master,  
origin/master, origin/HEAD)
Merge: cafa4ba 6e4b0e2
Author: Josh Blum <josh at joshknows.com>
Date:   Tue Sep 24 19:47:16 2019 -0500
     Merge pull request #243 from pothosware/get_python_lib
     try/except for site.getsitepackages()
{ hacked to enable external 10MHz GPSDO }

srsLTE
commit 62d295671510630ea9aea1754835f6c346de6ed7 (HEAD -> master, tag:  
release_19_09, origin/master, origin/HEAD)
Author: Xavier Arteaga <xavier at softwareradiosystems.com>
Date:   Wed Oct 16 15:40:30 2019 +0200
     SRSENB: Fixed PUCCH resource selection



Received Initial UE message -- Attach Request
Attach request -- IMSI: 001010000022774
Attach request -- eNB-UE S1AP Id: 15
Attach request -- Attach type: 2
Attach Request -- UE Network Capabilities EEA: 11100000
Attach Request -- UE Network Capabilities EIA: 01100000
Attach Request -- MS Network Capabilities Present: false
PDN Connectivity Request -- EPS Bearer Identity requested: 0
PDN Connectivity Request -- Procedure Transaction Id: 1
PDN Connectivity Request -- ESM Information Transfer requested: true
Attach Request -- Found previously attach UE.
Downlink NAS: Sending Authentication Request
Received UE Context Release Request. MME-UE S1AP Id 15
UE is not ECM connected. No need to release S1-U. MME UE S1AP Id 15

Using usrp b205mini as ue from a notebook gets pretty reliable SNR and pings

Still researching the SGS4-mini