Cannot connect srsUE to gNB through ZMQ. Gets stuck on RRC Connected. about srsran_project HOT 12 CLOSED

Hi @fabio-patrizi,

With the latest version of srsRAN Project, we have made some updates to the gNB configuration.

When configuring the gNB to connect to srsUE you now need to correctly set the dci_format_0_1_and_1_1 in the cell_cfg as well as the ss_type. By default non-fallback is used as the DCI format, this needs to be changed so that fallback is used. srsUE requires a common search space and fallback DCI to be used.

These changes are the same for both ZMQ and RF-based setups.

You can find updated config files reflecting these changes here.

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Hi @brendan-mcauliffe,
thanks for the support. I tried to follow the updated tutorial and to use the new config files but I'm still struggling to get the UE connected. Now I can use ¨ss_type: common" without problems, but still cannot connect the UE to the gNB.
I have updated the issue accordingly, replacing in particular the config files with the new ones.
Do you have any other recommendation?
Thanks a lot!

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Can you send the pcap files for the UE and the gNB NGAP?

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I guess this is the gNB NGAP pcap file:
gnb_ngap.zip

I cannot produce the UE's. This is the configuration I currently have for UE's pcap section:

[pcap]
enable = none
mac_filename = /tmp/ue_mac.pcap
mac_nr_filename = /tmp/ue_mac_nr.pcap
nas_filename = /tmp/ue_nas.pcap

I also tried enable = true and enable = yes but /tmp does not contain any of the files above.

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It looks like the gNB and core are successfully creating the NG connection. So it is probably down how the UE is registered in the core. I will need the UE pcaps to confirm this.

For the UE you can enable the pcaps on a per-layer basis. For example you can enable all pcaps using enable = mac, mac_nr, nas.

Can you enable these and send the relevant pcap files.

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Here they are:
ue_pcap_files.zip

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All of those files are empty, can you re-do the tests and make sure the pcaps get populated correctly.

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Uh, sorry, I didn't stop the UE and it didn't write the files. Now they are updated.

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With the latest version of the public code, there have been some changes to the DMRS format of the PUSCH. This is causing the RRC Setup to fail. We have highlighted the issue and are working on fix internally that should be available soon.

For now, you should revert to the last tagged release of srsRAN Project, version 23.5. You can find it here. You will also need to revert to the original configuration file. This means you should use rf_driver instead of ru_sdr, and remove the dci_format_0_1_and_1_1 from the cell_cfg option.

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Tried also with 23.5 but still the same:

Active RF plugins: libsrsran_rf_uhd.so libsrsran_rf_zmq.so
Inactive RF plugins:
Reading configuration file ./srsRAN_4G/build/ue_zmq.conf...

Built in Release mode using commit 921f17484 on branch master.

Opening 1 channels in RF device=zmq with args=tx_port=tcp://127.0.0.1:2001,rx_port=tcp://127.0.0.1:2000,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://127.0.0.1:2000
CH0 tx_port=tcp://127.0.0.1:2001
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=334
Random Access Complete. c-rnti=0x4601, ta=0
RRC Connected

I attach all configuration and pcap files below. Do you confirm configuration files are OK?

amf.yaml.txt
upf.yaml.txt
gnb_zmq.yaml.txt
ue_zmq.conf.txt

pcap_files.zip

Thanks

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@fabio-patrizi using the latest version of srsUE and srsRAN Project v23.5 should give you a stable connection. I can see in the attached ue_mac_nr pcap that the cause of the RRC connection not succeeding is due to a known issue with the latest version of the srsRAN Project code.

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@brendan-mcauliffe I tried once again, and I confirm it works. Probably, I inadvertently launched the latest gnb instead of v. 23.5. For the time being, I think I can work with this. Thanks a lot for the support!

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