[srslte-users] Pi 4 srsLTE
Kenny Barlee
kenneth.barlee at strath.ac.uk
Thu May 21 12:42:36 UTC 2020
Hey all
Setup instructions can be found here -
https://docs.srslte.com/en/latest/app_notes/source/pi4/source/index.html
Kenny
On 20/05/2020 22:56, mark h wrote:
> SRS Users List,
> I have been able to replicate Kenny's experiment using 2 Pi-4's and 2
> Ettus B210's. I have been seeing upload rates around 2-3 Mbps,
> Download around 500 Kbps. I have however been unable to get either the
> LimeUSB or LimeMini to work on the UE side with the PI-4's. the
> Pi-4+B210 when running ue consumes 3 cores around %75.
>
> I have been able to make a good connection with the Limes using an
> Up^2 board (Intel® Celeron™ N3350 (up to 2.4 GHz) and Lime USB as both
> ENB and UE, but it is far more unstable than the b210's. based upon my
> observations it appears a faster processor is required to support the
> Limes especially as UE. I have also been unable to utilize more than
> 15 resource blocks when using the Limes.
>
> My questions are:
> Has anyone had good results with the lime SDR's as UE?
> Does UE require a faster processor than ENB?
>
> On Tue, May 12, 2020 at 1:59 PM Andre Puschmann
> <andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>> wrote:
>
> Hey Mark,
>
> thanks a lot for your input.
>
> On 12/5/20 17:54, mark h wrote:
> > Andre,
> > I feel there are two areas of documentation.
> >
> > 1: tested and working to be included in your documented use cases
> > "Application notes"
> >
> > 2: "In the works" More of a forum/COI (Community of Interest) that
> > others could comment and easily contribute to.
>
> I agree. Those two types are different and should be handled
> differently.
>
> >
> > Then we could use "in the works" to feed tested and working
> > configurations/documented use cases. I am not sure what the best
> > platform would be for the second part if that is a Wiki or what. How
> > would we create a guide and submit it to be included in the
> application
> > notes? I am still new to GIT and open source documentation.
>
> I don't think there is "the" approach to open source software
> documentation that fits all projects. What we currently use is the
> list
> we are currently on, Github issues, and docs.srslte.com
> <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdocs.srslte.com%2F&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984358585&sdata=F6SF4WJob1o%2Fv2nOLOz%2FZUIJ39IlELczdJkCBiBoHP4%3D&reserved=0>.
> Other projects
> also use IRC, Slack, Matrix or similar tools.
>
> Wikis can be useful too. But, ultimately, they require someone who
> curates them in order to sustain that usefulness. Since the team
> behind
> srsLTE already maintains the three above mentioned means for user
> interaction and already spends significant resources in doing so, we
> won't be able to host such a Wiki ourselves.
>
> For content that has more tutorial character, documents a feature or
> provides general useful information we would suggest and encourage
> users
> to use Github pull-request feature to submit new or extend existing
> pages in the srsLTE docs repository. For content of type two a
> possible
> approach perhaps is to self-host a wiki or blog and inform the list
> about new articles or entries. Needless to say, that we are happy to
> promote useful content ourselves as well.
>
> Also, if there is content or topics that users would like to see
> covered
> in the docs, please don't hesitate to propose that here so we can
> plan and allocate resources to enlighten those dark corners.
>
>
> Thanks
> Andre
>
>
>
> >
> > Just my thoughts.
> >
> > On Tue, May 12, 2020 at 1:09 AM Andre Puschmann
> > <andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>
> > <mailto:andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>>> wrote:
> >
> > Kenny, Mark, all,
> >
> > first of all thanks for the digging into this. It looks
> really good.
> >
> > On 11/5/20 21:57, mark h wrote:
> > > Kenny,
> > > I agree, and would be more than happy to help document getting
> > srsLTE up
> > > and running on Low-cost SBC's and SDR's. There has been a
> lot of
> > > disaggregated work done and there are a LOT of emails to
> dig through.
> >
> > Yes, I agree. Also there is quite some info on Github
> (closed issues)
> > available that might also be useful for users.
> >
> > >
> > > Andre,
> > > Would you be interested in a WIKI like Kenny suggest?
> >
> > We are definitely interested in improving the user
> experience. In order
> > to keep the work load manageable on our side, we would
> however prefer to
> > use the existing mechanisms for documenting the project. The
> official
> > srsLTE docs are publicly hosted [1] and we are happy to
> > review/test/accept pull requests from our side. They are
> published under
> > [2].
> >
> > Maybe there is content that one could put inside a Wiki but that
> > wouldn't fit into this "docs format". The "Running srsLTE on
> Pi4"
> > walk-through, however, is amazing and would perfectly fit
> under the
> > application notes in [3].
> >
> > What are your thoughts on this?
> >
> > Thanks
> > Andre
> >
> > [1] https://github.com/srsLTE/srsLTE_docs
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FsrsLTE%2FsrsLTE_docs&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984368582&sdata=Npro%2FQSrMLkc6WB4Kyq%2BsxVaFGs5rR8z0fuqJ6v1djg%3D&reserved=0>
> > [2] https://docs.srslte.com/en/latest/
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.srslte.com%2Fen%2Flatest%2F&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984368582&sdata=qFySZEhiHhJJ0lrwEULUQioFGJUr%2FyVHE6Oxus4EB9A%3D&reserved=0>
> > [3]
> https://docs.srslte.com/en/latest/app_notes/source/index.html
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.srslte.com%2Fen%2Flatest%2Fapp_notes%2Fsource%2Findex.html&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984378577&sdata=bDZrjZ6fgHb2F4N%2F0G1tif5t7XRnfE6lrCW08Rk1WYM%3D&reserved=0>
> >
> >
> >
> > >
> > > On Mon, May 11, 2020 at 12:54 PM Kenneth Barlee
> > > <kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>
> <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>>
> > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>
> > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>>>> wrote:
> > >
> > > Sorry, emails got a little out of sync here..____
> > >
> > > ----____
> > >
> > > Mark____
> > >
> > > Sure, I tend to write a setup guide when I do this
> sort of thing.
> > > Copied below. It would be good if there was a
> community-editable
> > > wiki on the srsLTE git for people to share things like
> this! ____
> > >
> > > Its been running for over 2 hours now with x2 phones
> attached and
> > > streaming live internet radio. B210 in 2x2, tm=2. CPU
> and memory
> > > utilization is not horrendous.____
> > >
> > > cid:part1.4922EE7C.92DAB34B at strath.ac.uk____
> > >
> > > __ __
> > >
> > >
> > > Pi4 Ubuntu image____
> > >
> > >
> >
> http://cdimage.ubuntu.com/releases/20.04/release/ubuntu-20.04-preinstalled-server-arm64+raspi.img.xz
> <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcdimage.ubuntu.com%2Freleases%2F20.04%2Frelease%2Fubuntu-20.04-preinstalled-server-arm64%2Braspi.img.xz&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984378577&sdata=KXsZFOHr3Zr%2FTTGy%2F1F5HYSmKWLwcoEBlgbubew%2BT9s%3D&reserved=0>
> > >
> > > ____
> > >
> > >
> > > UHD____
> > >
> > > sudo add-apt-repository ppa:ettusresearch/uhd|____|
> > >
> > > sudo apt-get update|____|
> > >
> > > sudo apt-get install libuhd-dev libuhd3.15.0
> uhd-host|____|
> > >
> > > sudo /usr/lib/uhd/utils/uhd_images_downloader.py____
> > >
> > > sudo uhd_usrp_probe____
> > >
> > > __ __
> > >
> > >
> > > SoapySDR____
> > >
> > > git clone
> https://github.com/pothosware/SoapySDR.git|____|
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fpothosware%2FSoapySDR.git%257C____%257C&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984378577&sdata=5mG%2FI77WWx3aY%2BPI%2Fg5JxonN14oHjCkC4OEfRQTBxmk%3D&reserved=0>
> > <https://github.com/pothosware/SoapySDR.git%7C____%7C
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fpothosware%2FSoapySDR.git%257C____%257C&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984388571&sdata=cYUvhiqRETnVJYboeTwKbwUD6CO0O9r%2FFo6HNmCIc%2BE%3D&reserved=0>>
> > >
> > > cd SoapySDR|____|
> > >
> > > git checkout
> a489f3dca9d3ccd9b276b95a608ac3ef0299f635|____|
> > >
> > > mkdir build && cd build|____|
> > >
> > > cmake ..|____|
> > >
> > > make|____|
> > >
> > > sudo make install|____|
> > >
> > > sudo ldconfig____
> > >
> > > __ __
> > >
> > >
> > > LimeSuite____
> > >
> > > sudo add-apt-repository -y ppa:myriadrf/drivers|____|
> > >
> > > sudo apt-get update|____|
> > >
> > > sudo apt-get install git g++ cmake libsqlite3-dev|____|
> > >
> > > sudo apt-get install libi2c-dev libusb-1.0-0-dev____
> > >
> > > __ __
> > >
> > > git clone
> https://github.com/myriadrf/LimeSuite.git|____|
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmyriadrf%2FLimeSuite.git%257C____%257C&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984388571&sdata=BZKd3yEfXBziRLfo0nBYf0nNfywtPKQGxRML0taIfHE%3D&reserved=0>
> > <https://github.com/myriadrf/LimeSuite.git%7C____%7C
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmyriadrf%2FLimeSuite.git%257C____%257C&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984398567&sdata=GzhedlkpIDv3SMAmIEHbzoYL3%2Bi%2F1octGMajJhUtzwU%3D&reserved=0>>
> > >
> > > cd LimeSuite|____|
> > >
> > > mkdir build && cd build|____|
> > >
> > > cmake ../|____|
> > >
> > > make|____|
> > >
> > > sudo make install|____|
> > >
> > > sudo ldconfig____
> > >
> > > __ __
> > >
> > > cd ..|____|
> > >
> > > cd udev-rules|____|
> > >
> > > sudo ./install.sh____
> > >
> > > __ __
> > >
> > > LimeUtil --find|____|
> > >
> > > LimeUtil --update|____|
> > >
> > > SoapySDRUtil --find____
> > >
> > > __ __
> > >
> > >
> > > srsLTE____
> > >
> > > sudo apt-get install cmake libfftw3-dev libmbedtls-dev
> > > libboost-program-options-dev libconfig++-dev
> libsctp-dev____
> > >
> > > git clone https://github.com/srsLTE/srsLTE.git|____|
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FsrsLTE%2FsrsLTE.git%257C____%257C&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984398567&sdata=s7%2B%2BBK%2BGkbkG7etpSym5y9QT%2FMAIkM4d0ggjP%2B3WCE8%3D&reserved=0>
> > <https://github.com/srsLTE/srsLTE.git%7C____%7C
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FsrsLTE%2FsrsLTE.git%257C____%257C&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984398567&sdata=s7%2B%2BBK%2BGkbkG7etpSym5y9QT%2FMAIkM4d0ggjP%2B3WCE8%3D&reserved=0>>
> > >
> > > cd srsLTE|____|
> > >
> > > git checkout
> d045213fb9cbf98c83c06d7c17197a9dcbfddacf|____|
> > >
> > > mkdir build && cd build|____|
> > >
> > > cmake ../|____|
> > >
> > > make|____|
> > >
> > > sudo make install|____|
> > >
> > > sudo ldconfig____
> > >
> > > __ __
> > >
> > > |sudo srslte_install_configs.sh user|____
> > >
> > > __ __
> > >
> > >
> > > Run software / edit configs____
> > >
> > > sudo nano /root/.config/srslte/enb.conf
> > > sudo nano /root/.config/srslte/epc.conf
> > > sudo nano /root/.config/srslte/ue.conf
> > > |s|udo nano /root/.config/srslte/user_db.csv
> > > sudo srsenb||sudo srsepc||sudo srsue____
> > >
> > > # eNB conf:
> > > # device_name = UHD / soapy
> > > # device_args = auto < leave as is or it wont connect!
> > >
> > >
> > > ____
> > >
> > >
> > > Pi CPU____
> > >
> > > sudo apt install linux-tools-common
> > > sudo apt install linux-tools-raspi
> > > sudo systemctl disable ondemand____
> > >
> > > sudo nano /etc/default/cpufrequtils
> > > * GOVERNOR="performance"____
> > >
> > > reboot____
> > >
> > > sudo cpupower frequency-info
> > > sudo cat
> /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor____
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > On 11/05/2020 19:37, mark h wrote:____
> > >
> > > Kenny,____
> > >
> > > __ __
> > >
> > > Great to hear that you got it working. I am beginning
> to wonder if
> > > part of the problem I am having is due to the SoapySDR
> driver
> > > combined with Limesuite. I have been using Soapy
> because UHD has a
> > > lot of overhead. I share your sentiment regarding
> hardware access,
> > > similar situation here where I have been home and have
> limited
> > > hardware, but I do have an ettus N210 on hand so I
> would like to
> > > give it a try. Would you mind sharing your Pi software
> > > build/versions so I can try to replicate your results?
> After
> > seeing
> > > that the Pi is capable I am going to dive back into
> them. I
> > will let
> > > you know how it goes when I try the LimeSDR with the UHD
> > driver this
> > > afternoon.____
> > >
> > > __ __
> > >
> > > Take care____
> > >
> > > Mark____
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > On Mon, May 11, 2020 at 11:02 AM Kenneth Barlee
> > > <kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>
> > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>>
> > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>
> > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>>>>
> > > wrote:____
> > >
> > > Hey Mark____
> > >
> > > Good shout on the governor. Changing that to
> performance, I
> > can run
> > > a 2x2 cell with the USRP B210 on the Pi4, and am now
> getting
> > ~10Mbit
> > > downlink and ~3Mbit uplink (srsLTE v19.12). It seems
> to struggle
> > > with dynamic reconfiguration of resource blocks
> though, so if
> > > another UE appears it kills the first one - you have
> to toggle
> > > flight mode to get the two running happily.____
> > >
> > > One of the things Pi people have been complaining about is
> > that the
> > > USB3 bus on the Pi4 is not full USB3. Seems to be ok
> for the USRP
> > > though, which does point to the USB/Soapy/LimeSuite
> interface
> > > introducing too much latency. I don't have any other
> higher
> > spec dev
> > > boards to hand, so can't really try anything else.
> There are some
> > > Intel STK1AW32SC compute sticks on my desk in the
> office, but I
> > > haven't been allowed into the office for over 2 months
> now! Quad
> > > core 1.92GHz/ 2GB RAM and USB3.1; so you never know,
> they may work
> > > well.____
> > >
> > > I have just received a USRP E320 - may have a shot
> with that too.
> > > Not sure how it will cope though with running srsLTE
> as it has a
> > > lower spec CPU and less RAM than the Pi4! It does have
> a big
> > FPGA to
> > > play with though... potential project in trying to
> split the
> > PHY off
> > > and push it down onto the FPGA fabric. ____
> > >
> > > Cheers____
> > >
> > > Kenny____
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > *From:*mark h <markremington47 at gmail.com
> <mailto:markremington47 at gmail.com>
> > <mailto:markremington47 at gmail.com
> <mailto:markremington47 at gmail.com>>
> > > <mailto:markremington47 at gmail.com
> <mailto:markremington47 at gmail.com>
> > <mailto:markremington47 at gmail.com
> <mailto:markremington47 at gmail.com>>>>
> > > *Sent:* 11 May 2020 17:19
> > > *To:* Andre Puschmann
> > <andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>
> > <mailto:andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>>
> > > <mailto:andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>
> > <mailto:andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>>>>
> > > *Cc:* Kenneth Barlee <kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>
> > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>>
> > > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>
> > <mailto:kenneth.barlee at strath.ac.uk
> <mailto:kenneth.barlee at strath.ac.uk>>>>; srslte-users
> > > <srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>
> > <mailto:srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>>
> > > <mailto:srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>
> > <mailto:srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>>>>
> > > *Subject:* Re: [srslte-users] Pi 4 srsLTE____
> > >
> > > __ __
> > >
> > > Kenny,____
> > >
> > > I have been trying to get SRSUE and ENB to run on
> Pi-4's and have
> > > been experiencing the same issue. When I moved to a
> faster SBC
> > > (UP^2) board I was able to get both ENB and UE to work
> with
> > the same
> > > settings. If I had to guess I feel the latency on the Pi
> > introduces
> > > timing issues and it cannot establish the scheduling
> > connection. We
> > > are trying to compile a real-time Kernel to reduce the
> latency
> > so we
> > > will see what happens.____
> > >
> > > __ __
> > >
> > > I have also been struggling to get higher bandwidths
> using the
> > > LimeUSB's with i7 and i5 laptops but get a real stable
> connection
> > > that runs for hours at 1-2 MBPS. one thing I have found is
> > that the
> > > signal cleans up significantly when I put the governor in
> > > performance mode rather than on demand. I also no
> longer get late
> > > errors. I have attached a couple of images that show a
> change
> > in the
> > > signal when the governor is changed. You can see the
> significant
> > > jump in SNR. I also see a bandwidth increase when
> running a IPERF3
> > > test. ____
> > >
> > > __ __
> > >
> > > Summery of things I have found got me closer:____
> > >
> > > Cool and overclock the Pi____
> > >
> > > Set cpu governor to "performance"____
> > >
> > > Ensure the Pi has plenty of power____
> > >
> > > power the LimeSDR externally____
> > >
> > > Build SRSLTE and dependencies from source____
> > >
> > > __ __
> > >
> > > setup-1: Not working fails at the same point yours is
> but ENB
> > signal
> > > looks good on the SPEC-AN____
> > >
> > > Pi-4____
> > >
> > > LimeUSB (on an externally powered USB)____
> > >
> > > Raspian latest Distro____
> > >
> > > __ __
> > >
> > > Built from source:____
> > >
> > > SRSLTE 20.04____
> > >
> > > SoapySDR 0.7.01 (I had issues building the mos recent
> release they
> > > changed a variable type and SRSLTE no longer builds)____
> > >
> > > LimeSuite 20.01____
> > >
> > > __ __
> > >
> > > Setup-2: working at Nprb=15____
> > >
> > > Up^2 SBC____
> > >
> > > LimeUSB (on an externally powered USB)____
> > >
> > > ubuntu 18.04____
> > >
> > > __ __
> > >
> > > Built from source:____
> > >
> > > SRSLTE 20.04____
> > >
> > > SoapySDR 0.7.01 (I had issues building the mos recent
> release they
> > > changed a variable type and SRSLTE no longer builds)____
> > >
> > > LimeSuite 20.01____
> > >
> > > ____
> > >
> > > __ __
> > >
> > > Hope this helps.____
> > >
> > > __ __
> > >
> > > Mark____
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > On Wed, May 6, 2020 at 11:51 AM Andre Puschmann
> > > <andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>
> > <mailto:andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>>
> > > <mailto:andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>
> > <mailto:andre.puschmann at softwareradiosystems.com
> <mailto:andre.puschmann at softwareradiosystems.com>>>> wrote:____
> > >
> > > Kenneth,
> > >
> > > frankly speaking we don't do much over-the-air testing
> > ourselves
> > > with
> > > the Pi4. All success or failure stories so far
> have been from
> > > users on
> > > the list.
> > >
> > > Anyway, we'll have a look into this over the next
> days.
> > >
> > > Thanks
> > > Andre
> > >
> > > On 6/5/20 15:49, Kenneth Barlee wrote:
> > > > Hey guys
> > > >
> > > > I have been having a play with a Pi 4B /4GB rev
> 1.2 running
> > > the new
> > > > Ubuntu Pi Server 20.04 x64 image, and trying to
> get srsLTE
> > > working. I
> > > > know several others have been talking about
> trying this, but
> > > haven't
> > > > noticed my issue coming up elsewhere.
> > > >
> > > > I started with the latest versions of UHD, SoapySDR,
> > > LimeSuite, srsLTE
> > > > (commit ID
> e3e38482100f5bf13f15af3bc09df882e937bc60).
> > Everything
> > > > compiles happily (no need to change those lines in
> > > CMakeLists.txt), and
> > > > the srsenb/srsepc software runs successfully
> (after an
> > initial
> > > wait of
> > > > ~5 mins after first launch for any change in n_prb).
> > However,
> > > no phone
> > > > is able to fully connect when using a USRP B210/
> > LimeSDR-USB/
> > > > LimeSDR-Mini. It seems to start the attach, and
> there is
> > a core
> > > > handshake, but the core reports that the "UE is
> not ECM
> > > connected" and
> > > > the UE never shows the signal bars.
> > > >
> > > > Decided to roll the Pi back to srsLTE v19.12,
> commit ID
> > > > d045213fb9cbf98c83c06d7c17197a9dcbfddacf, as I
> have been
> > > running this on
> > > > my desktop for a while now, and know it is stable.
> > Again, this
> > > compiles
> > > > without issue. With this version, a phone will
> join a USRP
> > > B210 (not the
> > > > LimeSDRs, but that is probably another issue).
> It seems
> > relatively
> > > > stable, and can continue running for several
> hours with a
> > > phone attached
> > > > running internet ping tests.
> > > >
> > > > I have attached logs and PCAPs for the two setups.
> > > >
> > > > A potentially related sidenote, with both srsenb
> > versions, and all
> > > > radios, "SCHED: Could not transmit RAR within
> the window (RA
> > > TTI=2591,
> > > > Window=10, Now=2608)" type messages appear
> repeatedly in the
> > > terminal.
> > > > Running cellmapper on the phone, the LTE timing
> advance is
> > > estimated to
> > > > be '~250m' when using the USRP, but over '3.5km'
> with the
> > > LimeSDRs. This
> > > > is likely one of the reasons the LimeSDRs do not
> work with
> > > srsLTE v19.12.
> > > >
> > > > For reference, the UE used was a Samsung S20
> Ultra 5G;
> > LTE B3
> > > earfcn
> > > > 1934, n_prb=15, SISO tm=1 nof_ports = 1.
> > > >
> > > > Has anybody experienced similar? Happy to do
> more testing if
> > > it helps
> > > > with debugging!
> > > >
> > > > Thanks
> > > >
> > > >
> > > > Kenny Barlee | Research Associate
> > > > Software Defined Radio Research Laboratory
> > > > Department of Electronic and Electrical Engineering
> > > > University of Strathclyde
> > > >
> > > > _______________________________________________
> > > > srslte-users mailing list
> > > > srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>
> > <mailto:srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>>
> > >
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> <mailto:srslte-users at lists.softwareradiosystems.com>
> > <mailto:srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>>>
> > > >
> > >
> >
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> > > >
> > >
> > > _______________________________________________
> > > srslte-users mailing list
> > > srslte-users at lists.softwareradiosystems.com
> <mailto:srslte-users at lists.softwareradiosystems.com>
> > <mailto:srslte-users at lists.softwareradiosystems.com
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> > >
> >
> >
> > --
> > Andre Puschmann
> >
> > Software Radio Systems (SRS)
> > http://www.softwareradiosystems.com
> <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.softwareradiosystems.com%2F&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984428547&sdata=zhhRuqTh%2B9sU40k4MtjlVstAs1od7HRv8ApYDqYmVXI%3D&reserved=0>
> >
> > PGP/GnuPG key: 6C42AB31
> > fingerprint: 137A AE49 785B A445 257C 8AD7 D877 A498 6C42 AB31
> >
>
>
> --
> Andre Puschmann
>
> Software Radio Systems (SRS)
> http://www.softwareradiosystems.com
> <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.softwareradiosystems.com%2F&data=02%7C01%7Ckenneth.barlee%40strath.ac.uk%7C57df1b5f1bc9423bcfa408d7fd08ab09%7C631e0763153347eba5cd0457bee5944e%7C0%7C0%7C637256085984428547&sdata=zhhRuqTh%2B9sU40k4MtjlVstAs1od7HRv8ApYDqYmVXI%3D&reserved=0>
>
> PGP/GnuPG key: 6C42AB31
> fingerprint: 137A AE49 785B A445 257C 8AD7 D877 A498 6C42 AB31
>
--
Kenny Barlee | Research Associate Software Defined Radio Research
Laboratory Department of Electronic and Electrical Engineering
University of Strathclyde, G1 1XW (+44)141 548 2605
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