Connecting multi gNBs and multi UEs to the 5GC

[Chatty1231]

Hi,

I tried to connect 6 gNBs and 3UEs per each to the 5GC. In here I used docker 5G Core and 6 different gnuradio figures to run this setup. First I connected the all 6gNB, but once I started the gnuradio file of the gNB1 only two remained the connection with the 5GC and others gNB processes killed automatically and even can not get the IP addresses of the first three UEs.

Is there any parameter that I need to change in order to expand the connectivity in the 5GC or gNB?

[pgawlowicz]

Please check here: https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html#multiple-gnbs-connected-to-a-single-docker-based-open5gs

Also make sure you use different set of ZMQ ports to connect each set of gnb, gnuradio, UEs.

[pgawlowicz]

strange, could you share more details?
no need for different sampling rates.

[Chatty1231]

Sorry for the confusion.

Here I have attached the results from all outputs.

In here my gNBs are counting as gnb1,gnb2, gnb3 etc. and UEs are counting are (ue1,ue2,ue3), (ue4,ue5,ue6)

5GC
5gc_log.txt

gnb1
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_Project/build/apps/gnb$ sudo ./gnb -c gnb1_multiue.yaml
[sudo] password for chathu:

--== srsRAN gNB (commit 8120ffb) ==--

Lower PHY in executor blocking mode.
Available radio types: uhd and zmq.
Cell pci=1, bw=10 MHz, 1T1R, dl_arfcn=368500 (n3), dl_freq=1842.5 MHz, dl_ssb_arfcn=368410, ul_freq=1747.5 MHz

N2: Connection to AMF on 10.53.1.2:38412 completed
==== gNB started ===
Type to view help

gnb2 --> As I said once I start gnb3, this process killed automatically
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_Project/build/apps/gnb$ sudo ./gnb -c gnb2_multiue.yaml

--== srsRAN gNB (commit 8120ffb) ==--

Lower PHY in executor blocking mode.
Available radio types: uhd and zmq.
Cell pci=1, bw=10 MHz, 1T1R, dl_arfcn=368500 (n3), dl_freq=1842.5 MHz, dl_ssb_arfcn=368410, ul_freq=1747.5 MHz

N2: Connection to AMF on 10.53.1.2:38412 completed
==== gNB started ===
Type to view help
Killed
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_Project/build/apps/gnb$

gnb3
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_Project/build/apps/gnb$ sudo ./gnb -c gnb3_multiue.yaml

--== srsRAN gNB (commit 8120ffb) ==--

Lower PHY in executor blocking mode.
Available radio types: uhd and zmq.
Cell pci=1, bw=10 MHz, 1T1R, dl_arfcn=368500 (n3), dl_freq=1842.5 MHz, dl_ssb_arfcn=368410, ul_freq=1747.5 MHz

N2: Connection to AMF on 10.53.1.2:38412 completed
==== gNB started ===
Type to view help

Apart from that, I was able to get the IP addresses for the ue1, ue2, ue3 but not for the ue4, ue5, ue6.

ue4
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_4G/build/srsue/src$ sudo ./srsue ue4_multi.conf
Active RF plugins: libsrsran_rf_uhd.so libsrsran_rf_zmq.so
Inactive RF plugins:
Reading configuration file ue4_multi.conf...

Built in Release mode using commit ec29b0c1f on branch master.

Opening 1 channels in RF device=zmq with args=tx_port=tcp://127.0.0.1:2401,rx_port=tcp://127.0.0.1:2400,base_srate=11.52e6
Supported RF device list: UHD zmq file
CHx base_srate=11.52e6
Current sample rate is 1.92 MHz with a base rate of 11.52 MHz (x6 decimation)
CH0 rx_port=tcp://127.0.0.1:2400
CH0 tx_port=tcp://127.0.0.1:2401
Current sample rate is 11.52 MHz with a base rate of 11.52 MHz (x1 decimation)
Current sample rate is 11.52 MHz with a base rate of 11.52 MHz (x1 decimation)
Waiting PHY to initialize ... done!
Attaching UE...
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0x39, tti=174
Random Access Complete. c-rnti=0x4601, ta=0
RRC Connected
Failed to setup/configure GW interface
RRC NR reconfiguration successful.

ue5
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_4G/build/srsue/src$ sudo ./srsue ue5_multi.conf
[sudo] password for chathu:
Active RF plugins: libsrsran_rf_uhd.so libsrsran_rf_zmq.so
Inactive RF plugins:
Reading configuration file ue5_multi.conf...

Built in Release mode using commit ec29b0c1f on branch master.

Opening 1 channels in RF device=zmq with args=tx_port=tcp://127.0.0.1:2501,rx_port=tcp://127.0.0.1:2500,base_srate=11.52e6
Supported RF device list: UHD zmq file
CHx base_srate=11.52e6
Current sample rate is 1.92 MHz with a base rate of 11.52 MHz (x6 decimation)
CH0 rx_port=tcp://127.0.0.1:2500
CH0 tx_port=tcp://127.0.0.1:2501
Current sample rate is 11.52 MHz with a base rate of 11.52 MHz (x1 decimation)
Current sample rate is 11.52 MHz with a base rate of 11.52 MHz (x1 decimation)
Waiting PHY to initialize ... done!
Attaching UE...
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0x39, tti=174
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0x39, tti=334
Random Access Complete. c-rnti=0x4602, ta=0
RRC Connected
Failed to setup/configure GW interface
RRC NR reconfiguration successful.

ue6
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_4G/build/srsue/src$ sudo ./srsue ue6_multi.conf
[sudo] password for chathu:
Active RF plugins: libsrsran_rf_uhd.so libsrsran_rf_zmq.so
Inactive RF plugins:
Reading configuration file ue6_multi.conf...

Built in Release mode using commit ec29b0c1f on branch master.

Opening 1 channels in RF device=zmq with args=tx_port=tcp://127.0.0.1:2601,rx_port=tcp://127.0.0.1:2600,base_srate=11.52e6
Supported RF device list: UHD zmq file
CHx base_srate=11.52e6
Current sample rate is 1.92 MHz with a base rate of 11.52 MHz (x6 decimation)
CH0 rx_port=tcp://127.0.0.1:2600
CH0 tx_port=tcp://127.0.0.1:2601
Current sample rate is 11.52 MHz with a base rate of 11.52 MHz (x1 decimation)
Current sample rate is 11.52 MHz with a base rate of 11.52 MHz (x1 decimation)
Waiting PHY to initialize ... done!
Attaching UE...
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0x39, tti=174
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0x39, tti=334
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0x39, tti=494
Random Access Complete. c-rnti=0x4603, ta=0
RRC Connected
Failed to setup/configure GW interface
RRC NR reconfiguration successful.

My namespace list is as below
chathu@chathu-VMware-Virtual-Platform:~/srsRAN_4G/build/srsue/src$ sudo ip netns list
[sudo] password for chathu:
ue1
ue2
ue3
ue4
ue5
ue6

Kindly ask for your support to solve this issue.

BR,
Chathumini

[Chatty1231]

Additionally here I have attached the gnuradio figures also.

gnb1

gnb2

[Chatty1231]

@pgawlowicz @andrepuschmann

Kindly check and give me your feedback.

[pgawlowicz]

could you share your configs? maybe there are not enough resources in the VM to run the 6 setups.