[srsran-users] {Disarmed} Re: ul_freq is wrong when dl_arfcn is less than 153620 in band n28
sindi at innovatechtelecom.com
sindi at innovatechtelecom.com
Wed Feb 21 18:34:44 UTC 2024
Hi,
Yes, I have succeeded in getting a Motorola Moto G 5G attached using n28 arfcn = 153620, but there is a issue: the smartphone disconnects when accessing the Internet or try to measure the throughput by using Speed Test Internet app, for instance. It is possible to measure the download throughput but, usually, it disconnects when start the upload. By using the Iperf app with the smartphone as a server it stays attached with gNB after the measurement. If not try to access the Internet or to make upload the connection is stable. This behavior is the same in bands n3 and n78. I have not tested in other bands. I would be very grateful if someone give me a feedback about this issue. Regards, Sindi.
From: srsran-users <srsran-users-bounces at lists.srsran.com> On Behalf Of Bouras Abdennour
Sent: Tuesday, February 20, 2024 6:34 PM
To: srsran-users at lists.srsran.com
Subject: {Disarmed} Re: [srsran-users] ul_freq is wrong when dl_arfcn is less than 153620 in band n28
Have you succeeded in getting the COTS UE attached with the gnb using n28 arfcn = 153620 ?
What COTS UE are you using?
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Today's Topics:
1. ul_freq is wrong when dl_arfcn is less than 153620 in band
n28 (sindi at innovatechtelecom.com <mailto:sindi at innovatechtelecom.com> )
----------------------------------------------------------------------
Message: 1
Date: Mon, 19 Feb 2024 16:40:17 -0300
From: <sindi at innovatechtelecom.com <mailto:sindi at innovatechtelecom.com> >
To: <srsran-users at lists.srsran.com <mailto:srsran-users at lists.srsran.com> >
Subject: [srsran-users] ul_freq is wrong when dl_arfcn is less than
153620 in band n28
Message-ID: <000101da636b$7e046a40$7a0d3ec0$@innovatechtelecom.com <http://innovatechtelecom.com> >
Content-Type: text/plain; charset="iso-8859-1"
Hi,
I?ve been testing gNB in band n28 with COTS UE for 5MHz channel bandwidth
using Open5GS. The gNB works fine unless when the dl_arfcn is less than
152620. For instance, when dl_arfcn = 153600, it results that the dl_freq <
ul_freq. Below are the outputs for dl_arfcn=153620 and dl_arfcn=153600.
Also, there is the gNB configuration for dl_arfcn = 153600 that results in
dl_freq < ul_freq. Regards, Sindi
--== srsRAN gNB (commit a09b0008e) ==--
Connecting to AMF on <http://127.0.0.5:38412> MailScanner warning: numerical links are often malicious: 127.0.0.5:38412
Available radio types: uhd.
[INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_107400;
UHD_4.6.0.0-0ubuntu1~jammy1
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Making USRP object with args
'type=b200,num_recv_frames=64,num_send_frames=64'
[INFO] [B200] Detected Device: B200mini
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Setting master clock rate selection to 'automatic'.
[INFO] [B200] Asking for clock rate 16.000000 MHz...
[INFO] [B200] Actually got clock rate 16.000000 MHz.
[INFO] [MULTI_USRP] Setting master clock rate selection to 'manual'.
[INFO] [B200] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
Cell pci=1, bw=5 MHz, dl_arfcn=153620 (n28), dl_freq=768.1 MHz,
dl_ssb_arfcn=153650, ul_freq=713.1 MHz
==== gNodeB started ===
Type <t> to view trace
--== srsRAN gNB (commit a09b0008e) ==--
Connecting to AMF on <http://127.0.0.5:38412> MailScanner warning: numerical links are often malicious: 127.0.0.5:38412
Available radio types: uhd.
[INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_107400;
UHD_4.6.0.0-0ubuntu1~jammy1
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Making USRP object with args
'type=b200,num_recv_frames=64,num_send_frames=64'
[INFO] [B200] Detected Device: B200mini
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Setting master clock rate selection to 'automatic'.
[INFO] [B200] Asking for clock rate 16.000000 MHz...
[INFO] [B200] Actually got clock rate 16.000000 MHz.
[INFO] [MULTI_USRP] Setting master clock rate selection to 'manual'.
[INFO] [B200] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
Cell pci=1, bw=5 MHz, dl_arfcn=153600 (n28), dl_freq=768.0 MHz,
dl_ssb_arfcn=153630, ul_freq=798.0 MHz
==== gNodeB started ===
Type <t> to view trace
Configuration:
amf:
addr: 127.0.0.5 # The
address or hostname of the AMF.
bind_addr: 127.0.0.1 # A local IP
that the gNB binds to for traffic from the AMF.
ru_sdr:
device_driver: uhd # The RF
driver name.
device_args: type=b200,num_recv_frames=64,num_send_frames=64 # Optionally
pass arguments to the selected RF driver.
clock: external # Specify
the clock source used by the RF.
sync: # Specify
the sync source used by the RF.
srate: 23.04 # RF sample
rate might need to be adjusted according to selected bandwidth.
otw_format: sc12
tx_gain: 85 # Transmit
gain of the RF might need to adjusted to the given situation.
rx_gain: 60 # Receive
gain of the RF might need to adjusted to the given situation.
cell_cfg:
dl_arfcn: 153600 # ARFCN of
the downlink carrier (center frequency).
band: 28 # The NR
band.
channel_bandwidth_MHz: 5 # Bandwith
in MHz. Number of PRBs will be automatically derived.
common_scs: 15 # Subcarrier
spacing in kHz used for data.
plmn: "99970" # PLMN
broadcasted by the gNB.
tac: 1 # Tracking
area code (needs to match the core configuration).
pci: 1 # Physical
cell ID.
pcap:
mac_enable: false # Set to
true to enable MAC-layer PCAPs.
mac_filename: /tmp/gnb_mac.pcap # Path where
the MAC PCAP is stored.
ngap_enable: false # Set to
true to enable NGAP PCAPs.
ngap_filename: /tmp/gnb_ngap.pcap # Path where
the NGAP PCAP is stored.
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