COTS dropping connection to gNB #100

jonniebeeb · 2023-06-16T11:27:38Z

jonniebeeb
Jun 16, 2023

Hi

I have a problem when using the gNB when connected to COTS handsets, in that the handset seems to drop the connection to the gNB for no obvious reason.

My set up is a X310, externally locked to a gps reference clock with the Open5GS core.

I have two phones and the behaviour is slightly different for each.

I can connect a google Pixel 6a to the gNB. It is happy and I get really good signal to noise ratios in the uplink (around 30dB) and downlink (around 28dB). and I see really clean constellations. It works fine, I can stream video etc, then after 3 minutes I see the "5G" connection disappear from the phone screen. After a short while the gNB issues a UeContextReleaseRequest. I see no errors or warnings in any of the Open5GS or gNB logs.

If I put the handset in flight mode, then back out, it immediately reconnects to the gNB, and it is happy for 3 minutes again before losing the connection to the gNB.

I have also tried a OnePlus phone. The situation here is slightly different in that the phone will connect to the gNB but lose the connection after a few seconds.

I have also used the previous code base in https://github.com/srsran/srsRAN_4G running as a 5G SA network and the OnePlus phone will work in that setup and will remain connected for many hours. Everything else is the same in this setup, the X310 connected to external references and the Open5GS core.

I'm struggling to see any reason why the phone disconnects in the new https://github.com/srsran/srsRAN_Project code base.

Has anyone seen a similar situation?

Answered by robertfalkenberg

Jun 23, 2023

The Pixel 6 drops the connection if IMS is not configured within 180sec after attach.

Fortunately, you can change the timeout or disable this feature entirely via hidden IMS settings menu: *#*#0702#*#*
Both options work:

Infinite timeout: Set NR_TIMER_WAIT_IMS_REGISTRATION from default 180 to -1
Disable timeout: Set SUPPORT_IMS_NR_REGISTRATION_TIMER from default 1 to 0

The settings are associated with the SIM card and persistent across reboots, i.e. the UE remembers the settings for each SIM separately.

View full answer

ismagom · 2023-06-16T11:29:54Z

ismagom
Jun 16, 2023
Maintainer

Hi @jonniebeeb ,

Thanks for your feedback. Can you send us gnb logs in info and pcap captures? You can enable them in the gnb.yml config file.

0 replies

jonniebeeb · 2023-06-20T10:20:14Z

jonniebeeb
Jun 20, 2023
Author

Hi @ismagom
I have attached some log files. I have captured for the pxiel 6a, this is a fairly big log file (so I have zipped it to satisfy the upload limit) as this stays connected for 3 minutes. I have had to zip and split the gnb_mac.pcap file for the pixel as this was also a big file.

I have also captured for the OnePlus. This disconnects after a few seconds.

Hope these help you diagnose the issue. Please let me know if you need any more captures.

Thanks

gnb_ngap_pixel.zip

[gnb_pixel_info.zip](https://github.com/srsran/srsRAN_Project/file
gnb_ngap_oneplus.zip
gnb_mac_pixel_3.zip

gnb_mac_pixel_1.zip
gnb_mac_pixel_5.zip

gnb_mac_pixel_4.zip

gnb_mac_pixel_2.zip

gnb_ngap_pixel.zip
s/11798707/gnb_pixel_info.zip)
gnb_mac_oneplus.zip

gnb_oneplus_info.log

0 replies

jonniebeeb · 2023-06-20T10:46:40Z

jonniebeeb
Jun 20, 2023
Author

I think I see where the pixel disconnects in the log file at around 2023-06-20T09:55:06.029334. I see good snr in the PUSCH (around 32dB) then there is a sudden drop in snr to about -23dB and crc failures. There is no obvious cause for this.

2023-06-20T09:55:06.029334 [SCHED ] [I] [ 634.3] Slot decisions cell=0 t=6us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..4) rv=0 tbs=76
2023-06-20T09:55:06.033500 [UL-PHY1 ] [I] [ 634.3] PUSCH: rnti=0x4601 h_id=0 prb=[3, 4) symb=[0, 14) mod=64QAM rv=0 tbs=76 crc=OK iter=1.0 snr=31.8dB t=120.2us
2023-06-20T09:55:06.033507 [MAC ] [I] [ 634.7] UL PDU rnti=0x4601 ue=0 subPDUs: [SBSR: lcg=1 bs=3, PAD: len=73]
2023-06-20T09:55:06.034366 [DL-PHY4 ] [I] [ 634.8] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=0 al=4 t=20.6us
2023-06-20T09:55:06.038325 [SCHED ] [I] [ 635.2] Slot decisions cell=0 t=9us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..4) rv=0 tbs=76
2023-06-20T09:55:06.042419 [UL-PHY4 ] [I] [ 635.2] PUSCH: rnti=0x4601 h_id=0 prb=[3, 4) symb=[0, 14) mod=64QAM rv=0 tbs=76 crc=OK iter=1.0 snr=32.5dB t=91.1us
2023-06-20T09:55:06.042425 [MAC ] [I] [ 635.6] UL PDU rnti=0x4601 ue=0 subPDUs: [SE_PHR: total_len=3, LBSR: bitmap=0x2 lcg=1 bs=1 , PAD: len=68]
2023-06-20T09:55:06.043332 [DL-PHY5 ] [I] [ 635.7] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=12 al=4 t=17.8us
2023-06-20T09:55:06.047305 [SCHED ] [I] [ 636.1] Slot decisions cell=0 t=7us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..4) rv=0 tbs=76
2023-06-20T09:55:06.049381 [UL-PHY2 ] [I] [ 635.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=61.5us
2023-06-20T09:55:06.051618 [UL-PHY3 ] [I] [ 636.1] PUSCH: rnti=0x4601 h_id=0 prb=[3, 4) symb=[0, 14) mod=64QAM rv=0 tbs=76 crc=OK iter=1.0 snr=32.1dB t=110.1us
2023-06-20T09:55:06.051623 [MAC ] [I] [ 636.5] UL PDU rnti=0x4601 ue=0 subPDUs: [SBSR: lcg=1 bs=1, PAD: len=73]
2023-06-20T09:55:06.052384 [DL-PHY6 ] [I] [ 636.6] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=0 al=4 t=19.0us
2023-06-20T09:55:06.056286 [SCHED ] [I] [ 637.0] Slot decisions cell=0 t=7us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..4) rv=0 tbs=76
2023-06-20T09:55:06.060530 [UL-PHY1 ] [I] [ 637.0] PUSCH: rnti=0x4601 h_id=0 prb=[3, 4) symb=[0, 14) mod=64QAM rv=0 tbs=76 crc=OK iter=1.0 snr=31.8dB t=116.2us
2023-06-20T09:55:06.060551 [MAC ] [I] [ 637.4] UL PDU rnti=0x4601 ue=0 subPDUs: [SE_PHR: total_len=3, LBSR: bitmap=0x2 lcg=1 bs=1 , PAD: len=68]
2023-06-20T09:55:06.061319 [DL-PHY7 ] [I] [ 637.5] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=16 al=4 t=19.5us
2023-06-20T09:55:06.065337 [SCHED ] [I] [ 637.9] Slot decisions cell=0 t=7us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..4) rv=0 tbs=76
2023-06-20T09:55:06.069450 [UL-PHY4 ] [I] [ 637.9] PUSCH: rnti=0x4601 h_id=0 prb=[3, 4) symb=[0, 14) mod=64QAM rv=0 tbs=76 crc=OK iter=1.0 snr=33.2dB t=102.4us
2023-06-20T09:55:06.069458 [MAC ] [I] [ 638.3] UL PDU rnti=0x4601 ue=0 subPDUs: [LBSR: bitmap=0x2 lcg=1 bs=1 , PAD: len=71]
2023-06-20T09:55:06.070361 [DL-PHY0 ] [I] [ 638.4] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=16 al=4 t=18.9us
2023-06-20T09:55:06.074263 [SCHED ] [I] [ 638.8] Slot decisions cell=0 t=7us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..4) rv=0 tbs=76
2023-06-20T09:55:06.078435 [UL-PHY2 ] [I] [ 638.8] PUSCH: rnti=0x4601 h_id=0 prb=[3, 4) symb=[0, 14) mod=64QAM rv=0 tbs=76 crc=OK iter=1.0 snr=31.6dB t=105.1us
2023-06-20T09:55:06.078444 [MAC ] [I] [ 639.2] UL PDU rnti=0x4601 ue=0 subPDUs: [SBSR: lcg=0 bs=0, SE_PHR: total_len=3, PAD: len=70]
2023-06-20T09:55:06.089386 [UL-PHY3 ] [I] [ 639.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=0 csi1=0101 t=60.2us
2023-06-20T09:55:06.129435 [UL-PHY1 ] [I] [ 643.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=84.1us
2023-06-20T09:55:06.169409 [UL-PHY4 ] [I] [ 647.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=0 csi1=0101 t=54.8us
2023-06-20T09:55:06.209348 [UL-PHY2 ] [I] [ 651.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=61.3us
2023-06-20T09:55:06.249429 [UL-PHY3 ] [I] [ 655.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=0 csi1=0101 t=63.8us
2023-06-20T09:55:06.289414 [UL-PHY1 ] [I] [ 659.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=78.1us
2023-06-20T09:55:06.329388 [UL-PHY4 ] [I] [ 663.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=57.1us
2023-06-20T09:55:06.369393 [UL-PHY2 ] [I] [ 667.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=65.8us
2023-06-20T09:55:06.409367 [UL-PHY3 ] [I] [ 671.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=55.4us
2023-06-20T09:55:06.449448 [UL-PHY1 ] [I] [ 675.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=72.4us
2023-06-20T09:55:06.489437 [UL-PHY4 ] [I] [ 679.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=56.5us
2023-06-20T09:55:06.529314 [UL-PHY2 ] [I] [ 683.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=59.1us
2023-06-20T09:55:06.569525 [UL-PHY3 ] [I] [ 687.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=86.8us
2023-06-20T09:55:06.609472 [UL-PHY1 ] [I] [ 691.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=75.1us
2023-06-20T09:55:06.649326 [UL-PHY4 ] [I] [ 695.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=48.7us
2023-06-20T09:55:06.689393 [UL-PHY2 ] [I] [ 699.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=59.9us
2023-06-20T09:55:06.729380 [UL-PHY3 ] [I] [ 703.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=57.8us
2023-06-20T09:55:06.769458 [UL-PHY1 ] [I] [ 707.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=65.5us
2023-06-20T09:55:06.809433 [UL-PHY4 ] [I] [ 711.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=55.6us
2023-06-20T09:55:06.849376 [UL-PHY2 ] [I] [ 715.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=61.6us
2023-06-20T09:55:06.889367 [UL-PHY3 ] [I] [ 719.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=46.8us
2023-06-20T09:55:06.929442 [UL-PHY1 ] [I] [ 723.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=65.5us
2023-06-20T09:55:06.969488 [UL-PHY4 ] [I] [ 727.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=84.3us
2023-06-20T09:55:07.009389 [UL-PHY2 ] [I] [ 731.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=57.7us
2023-06-20T09:55:07.049455 [UL-PHY3 ] [I] [ 735.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=55.4us
2023-06-20T09:55:07.089414 [UL-PHY1 ] [I] [ 739.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=72.3us
2023-06-20T09:55:07.129513 [UL-PHY4 ] [I] [ 743.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=78.1us
2023-06-20T09:55:07.169331 [UL-PHY2 ] [I] [ 747.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=58.4us
2023-06-20T09:55:07.209441 [UL-PHY3 ] [I] [ 751.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=50.9us
2023-06-20T09:55:07.249459 [UL-PHY1 ] [I] [ 755.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=72.9us
2023-06-20T09:55:07.289306 [UL-PHY4 ] [I] [ 759.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=44.7us
2023-06-20T09:55:07.329400 [UL-PHY2 ] [I] [ 763.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=70.0us
2023-06-20T09:55:07.369444 [UL-PHY3 ] [I] [ 767.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=61.5us
2023-06-20T09:55:07.409446 [UL-PHY1 ] [I] [ 771.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=64.1us
2023-06-20T09:55:07.449452 [UL-PHY4 ] [I] [ 775.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=58.2us
2023-06-20T09:55:07.489352 [UL-PHY2 ] [I] [ 779.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=61.2us
2023-06-20T09:55:07.529361 [UL-PHY3 ] [I] [ 783.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=51.0us
2023-06-20T09:55:07.569387 [UL-PHY1 ] [I] [ 787.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=56.9us
2023-06-20T09:55:07.609331 [UL-PHY4 ] [I] [ 791.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=51.8us
2023-06-20T09:55:07.649386 [UL-PHY2 ] [I] [ 795.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=62.3us
2023-06-20T09:55:07.689410 [UL-PHY3 ] [I] [ 799.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=59.6us
2023-06-20T09:55:07.729419 [UL-PHY1 ] [I] [ 803.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=72.3us
2023-06-20T09:55:07.769403 [UL-PHY4 ] [I] [ 807.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=56.4us
2023-06-20T09:55:07.809418 [UL-PHY2 ] [I] [ 811.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=63.8us
2023-06-20T09:55:07.849370 [UL-PHY3 ] [I] [ 815.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=57.0us
2023-06-20T09:55:07.889381 [UL-PHY1 ] [I] [ 819.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=57.2us
2023-06-20T09:55:07.929441 [UL-PHY4 ] [I] [ 823.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=60.3us
2023-06-20T09:55:07.969412 [UL-PHY2 ] [I] [ 827.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=74.1us
2023-06-20T09:55:08.009473 [UL-PHY3 ] [I] [ 831.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=60.4us
2023-06-20T09:55:08.049420 [UL-PHY1 ] [I] [ 835.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=63.1us
2023-06-20T09:55:08.089410 [UL-PHY4 ] [I] [ 839.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=56.8us
2023-06-20T09:55:08.129413 [UL-PHY2 ] [I] [ 843.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=60.4us
2023-06-20T09:55:08.169404 [UL-PHY3 ] [I] [ 847.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=60.8us
2023-06-20T09:55:08.209413 [UL-PHY1 ] [I] [ 851.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=64.9us
2023-06-20T09:55:08.249358 [UL-PHY4 ] [I] [ 855.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=56.8us
2023-06-20T09:55:08.289363 [UL-PHY2 ] [I] [ 859.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=58.8us
2023-06-20T09:55:08.329364 [UL-PHY3 ] [I] [ 863.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=46.2us
2023-06-20T09:55:08.369361 [UL-PHY1 ] [I] [ 867.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=55.0us
2023-06-20T09:55:08.409402 [UL-PHY4 ] [I] [ 871.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=55.2us
2023-06-20T09:55:08.449408 [UL-PHY2 ] [I] [ 875.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=no t=58.0us
2023-06-20T09:55:08.489347 [UL-PHY3 ] [I] [ 879.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=54.9us
2023-06-20T09:55:08.529471 [UL-PHY1 ] [I] [ 883.9] PUCCH: rnti=0x4601 format=1 prb1=103 prb2=na symb=[0, 14) cs=0 occ=0 sr=yes t=71.6us
2023-06-20T09:55:08.530333 [DL-PHY4 ] [I] [ 884.4] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=16 al=4 t=23.5us
2023-06-20T09:55:08.534346 [SCHED ] [I] [ 884.8] Slot decisions cell=0 t=6us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..9) rv=0 tbs=544
2023-06-20T09:55:08.538478 [UL-PHY4 ] [I] [ 884.8] PUSCH: rnti=0x4601 h_id=0 prb=[3, 9) symb=[0, 14) mod=64QAM rv=0 tbs=544 crc=KO iter=6.0 snr=-23.4dB t=177.5us
2023-06-20T09:55:08.539364 [DL-PHY5 ] [I] [ 885.3] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=28 al=4 t=21.7us
2023-06-20T09:55:08.543328 [SCHED ] [I] [ 885.7] Slot decisions cell=0 t=6us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..9) rv=2 tbs=544
2023-06-20T09:55:08.547670 [UL-PHY2 ] [I] [ 885.7] PUSCH: rnti=0x4601 h_id=0 prb=[3, 9) symb=[0, 14) mod=64QAM rv=2 tbs=544 crc=KO iter=6.0 snr=-18.0dB t=329.3us
2023-06-20T09:55:08.548333 [DL-PHY6 ] [I] [ 886.2] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=12 al=4 t=17.3us
2023-06-20T09:55:08.552306 [SCHED ] [I] [ 886.6] Slot decisions cell=0 t=6us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..9) rv=3 tbs=544
2023-06-20T09:55:08.556819 [UL-PHY3 ] [I] [ 886.6] PUSCH: rnti=0x4601 h_id=0 prb=[3, 9) symb=[0, 14) mod=64QAM rv=3 tbs=544 crc=KO iter=6.0 snr=-21.4dB t=381.6us
2023-06-20T09:55:08.557380 [DL-PHY7 ] [I] [ 887.1] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=16 al=4 t=16.6us
2023-06-20T09:55:08.561298 [SCHED ] [I] [ 887.5] Slot decisions cell=0 t=6us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..9) rv=1 tbs=544
2023-06-20T09:55:08.565882 [UL-PHY1 ] [I] [ 887.5] PUSCH: rnti=0x4601 h_id=0 prb=[3, 9) symb=[0, 14) mod=64QAM rv=1 tbs=544 crc=KO iter=6.0 snr=-31.7dB t=394.6us
2023-06-20T09:55:08.566308 [DL-PHY0 ] [I] [ 888.0] PDCCH: rnti=0x4601 ss_id=2 format=0_0 cce=8 al=4 t=17.0us
2023-06-20T09:55:08.569386 [UL-PHY4 ] [I] [ 887.9] PUCCH: rnti=0x4601 format=2 prb=[2, 3) prb2=na symb=[12, 14) sr=2 csi1=2222 t=56.8us
2023-06-20T09:55:08.570344 [SCHED ] [I] [ 888.4] Slot decisions cell=0 t=7us: UL: ue=0 rnti=0x4601 h_id=0 ss_id=2 prb=[3..9) rv=0 tbs=544
2023-06-20T09:55:08.574684 [UL-PHY2 ] [I] [ 888.4] PUSCH: rnti=0x4601 h_id=0 prb=[3, 9) symb=[0, 14) mod=64QAM rv=0 tbs=544 crc=KO iter=6.0 snr=-15.4dB t=404.9us
2023-06-20T09:55:08.575317 [SCHED ] [I] [ 888.9] UL HARQ rnti=0x4601 cell=0 h_id=0: Discarding HARQ with tbs=544. Cause: Maximum number of reTxs 4 exceeded

0 replies

jonniebeeb · 2023-06-20T21:13:45Z

jonniebeeb
Jun 20, 2023
Author

Hi @herlesupreeth

Thank you for your reply. I think you may be looking at the wrong log files :-/ I don't see any lines as you've pasted above, and my log files were taken on the 20th, not the 19th.

I noticed one of my links has got mangled.

The log file links are

gnb_pixel_info.zip
and
gnb_oneplus_info.log

Note, I already have VoLTE turned off on the phones.

Thanks

2 replies

herlesupreeth Jun 21, 2023
Collaborator

Oops, sorry I mixed up in answering notifications

herlesupreeth Jun 21, 2023
Collaborator

@jonniebeeb can you please share your gnb.yaml config file?? And, are you using the latest code??

ismagom · 2023-06-21T00:51:58Z

ismagom
Jun 21, 2023
Maintainer

Hi @jonniebeeb , I also can't see anything at first sight. What kind of traffic are you doing? Can you send logs with phy_level = debug please?

0 replies

jonniebeeb · 2023-06-21T11:36:24Z

jonniebeeb
Jun 21, 2023
Author

Hi @Ismagon

I am streaming video, it is using about 10Mbits/sec. I am using the main branch of the code that was updated 3 weeks ago. I have also tried the release 23.5 tag - the behaviour is the same in either case. I am using the phone in a screened box so I don't believe it is signal variation that is causing the connection failure. The pixel phone seems to disconnected after 3 minutes every time. It's as if something times out.

I have attached my gnb.yaml file and some logs with phy_level = debug.

[gnb_rf_n310_fdd_n3_20mhz_j.zip](https://github.com/s
gnb_pixel_debug_21.zip
rsran/srsRAN_Project/files/11816937/gnb_rf_n310_fdd_n3_20mhz_j.zip)
gnb_mac_pixel_21.z01.zip
gnb_mac_pixel_21.z02.zip

gnb_mac_pixel_21.z03.zip
gnb_mac_pixel_21.z04.zip
gnb_mac_pixel_21.z05.zip
gnb_mac_pixel_21.z06.zip
gnb_ngap_pixel_21.zip
gnb_oneplus_debug_21.zip
gnb_mac_oneplus_21.zip

gnb_ngap_oneplus_21.zip

Thanks

0 replies

jonniebeeb · 2023-06-21T11:37:41Z

jonniebeeb
Jun 21, 2023
Author

one of the urls got mangled again. The gnb.yaml file

gnb_rf_n310_fdd_n3_20mhz_j.zip

0 replies

ismagom · 2023-06-21T12:04:08Z

ismagom
Jun 21, 2023
Maintainer

Hi @jonniebeeb , the problem in the two phones is different.

In the oneplus, the problem seems to be here:

2023-06-21T10:39:12.022795 [CU-CP   ] [W] No config for 5QI=0x5 present
2023-06-21T10:39:12.022795 [CU-CP   ] [W] Currently configured 5QIs:
2023-06-21T10:39:12.022796 [CU-CP   ] [W]  - 5QI=0x7: PDCP=rb_type=DRB rlc_mode=UM int_req=false cip_req=true TX=[sn_size=12 discard_timer=-1] RX=[sn_size=12 t_reordering=100 out_of_order=false]
2023-06-21T10:39:12.022796 [CU-CP   ] [W]  - 5QI=0x9: PDCP=rb_type=DRB rlc_mode=AM int_req=false cip_req=true TX=[sn_size=12 discard_timer=-1] RX=[sn_size=12 t_reordering=220 out_of_order=false]
2023-06-21T10:39:12.022797 [CU-CP   ] [E] No valid config for 5QI 5
2023-06-21T10:39:12.022797 [CU-CP   ] [E] OoS flow configuration for flow ID 1 can't be derived
2023-06-21T10:39:12.022798 [CU-CP   ] [E] ue=0: "PDU Session Resource Setup Routine" Invalid PDU Session Resource Setup
2023-06-21T10:39:12.022799 [CU-CP   ] [E] ue=0: "PDU Session Resource Setup Routine" failed.
2023-06-21T10:39:12.022812 [NGAP    ] [I] ue=0 Sending PduSessionResourceSetupResponse
2023-06-21T10:39:12.023859 [NGAP    ] [I] ue=0 Received UeContextReleaseCommand (ran_ue_id=0)
2023-06-21T10:39:12.023873 [RRC     ] [I] ue=0 DCCH DL rrcRelease

The gNB is releasing the UE because it can't find the 5QI 5. You can try adding that 5QI to the qos.yml file and passing it as an extra parameter like:

./gnb -c my_config.yml -c qos.yml

I would also recommend to upgrade to the latest release (from last monday) since there are improvements in handling a second bearer.

Regarding the pixel6, we are still investigating. The signal looks good in DL and UL and there is no signalling coming from the network to indicate a Release to the UE. For some reason it just disconnects abruptly. Can you try with other type of traffic such as ping?

thanks

0 replies

jonniebeeb · 2023-06-21T13:49:45Z

jonniebeeb
Jun 21, 2023
Author

Hi @ismagom

I have tried a few things. I have pulled the latest code and rebuilt. I have tried the pixel6 again, this time just sending pings from the UE to the upf and from the upf to to the UE. It still disconnects after 3 minutes.

I also removed the 5QI 5 with the OnePlus. This has removed the previous "No valid config for 5QI 5" error. It still disconnects after a short while.

I have attached the log files for each
gnb_oneplus_21_2.log

gnb_pixel_21_2.zip

thanks

0 replies

ismagom · 2023-06-21T14:31:06Z

ismagom
Jun 21, 2023
Maintainer

What's the exact OnePlus model?

0 replies

jonniebeeb · 2023-06-21T14:48:56Z

jonniebeeb
Jun 21, 2023
Author

It is a OnePlus Nord CE 2 (IV2201) . This phone worked well with the srsRAN_4G code base configured in a 5G SA mode. I could stream video for hours without interruption.

0 replies

robertfalkenberg · 2023-06-22T08:56:50Z

robertfalkenberg
Jun 22, 2023
Collaborator

We can reproduce the issue with a Pixel 6 phone. It quietly disconnects 180sec after RRC Setup Request. We are investigating the issue.

0 replies

robertfalkenberg · 2023-06-23T10:39:22Z

robertfalkenberg
Jun 23, 2023
Collaborator

The Pixel 6 drops the connection if IMS is not configured within 180sec after attach.

Fortunately, you can change the timeout or disable this feature entirely via hidden IMS settings menu: *#*#0702#*#*
Both options work:

Infinite timeout: Set NR_TIMER_WAIT_IMS_REGISTRATION from default 180 to -1
Disable timeout: Set SUPPORT_IMS_NR_REGISTRATION_TIMER from default 1 to 0

The settings are associated with the SIM card and persistent across reboots, i.e. the UE remembers the settings for each SIM separately.

0 replies

jonniebeeb · 2023-06-23T11:06:08Z

jonniebeeb
Jun 23, 2023
Author

Wow ! Well done for finding that. I am out of the lab today, but will be able to try that out on Monday.

Many thanks for looking into this.

0 replies

corrado113 · 2023-07-12T11:33:15Z

corrado113
Jul 12, 2023

I apologize for asking about an unrelated matter. I am also using a Pixel 6a but I am not able to see the srsRAN network. I am using the same config file as the one provided by @jonniebeeb, adapted to use a b210 as RF frontend. How did you configure the smartphone to see the 5GSA cell? I tried a mix of everything: suggestions from the docs tutorial, root rights to force or exclude bands, etc. Nothing worked so far.

9 replies

robertfalkenberg Jul 14, 2023
Collaborator

Another addon regarding this question from @corrado113

[...] Do you know whether 5G NSA networks are shown as LTE or 5G in the network list? In my area, local mobile network operators do not have any 5G SA cells, only 5G NSA, so that would explain why I only see LTE networks (assuming that the phone shows 5G NSA cells as LTE).

~~Both, SA and NSA, are shown as 5G in the network search, as in this screenshot. The 00101 is my srsRAN cell; the other public 5G networks are NSA (they haven't all deployed SA yet).~~
Edit: I just repeated manual network search with current TQ3A.230605.010 and it seems they have changed behavior: Now only 5G-SA networks are shown as 5G.

robertfalkenberg Jul 14, 2023
Collaborator

Another note regarding this from @corrado113

Previously, I have been using the PLMN 90170, as my Sysmocom SJS1 USIMs have an IMSI starting with that MCC and MNC. In my latest attempt, I used 00101 still the phone does not see the srsran cell.

Please also change the PLMN prefix of the IMSI from 90170 to 00101 when connecting to 00101.

With this IMSI 00101... it found the network and attached.

With this IMSI 90170... it didn't find the network - no attach.

corrado113 Jul 18, 2023

@jonniebeeb and @robertfalkenberg , thank you for finding the time to help me.
I am using a Pixel 6a with software build TQ3A.230605.010. Since a new software version is available (TQ3A.230705.001), I'll try to update it to see if anything changes.
The RF setup should be fine: using srsRAN 4G, the phone correctly attaches and exchanges traffic with the core network.
I found the latest comment by @robertfalkenberg to be interesting. I can not change the IMSI of the USIM as I don't have the ADM keys to do so. Would you be able to check whether using an IMSI starting with 90170 the Pixel is able to find and connect to a network with 90170 as PLMN? If that fails, I'll consider buying new USIMs with ADM keys. Thanks a lot in advance!

robertfalkenberg Jul 20, 2023
Collaborator

Hi @corrado113,

Here are my findings for different network (PLMN / IMSI) combinations with Pixel 6:

(00101 / 00101) Found and attached
(00102 / 00101) Not found
(00102 / 00102) Not found
(99970 / 99970) Not found
(99970 / 00101) Not found
(90170 / 90170) Not found
(90170 / 00101) Not found
(52503 / 52503) Not found
(52503 / 00101) Not found

For validation, I also tried each combination with Telit FN990A28 modem, and it attached in all cases.

corrado113 Sep 27, 2023

Hi @robertfalkenberg,
sorry for the slow response. Just last week I obtained a programmable USIM. After setting the IMSI 00101, I can confirm that the Pixel 6a can now see and attach to the private srsRAN network.
Thanks a lot for your support!

rolandmartinson7890 · 2023-09-27T13:08:48Z

rolandmartinson7890
Sep 27, 2023

@robertfalkenberg Wanted to add to the conversation. My experience was different because the first thing I did when I obtaned the Google Pixel 6 phones was update to Android 13. All two of my Google Pixel Phones could not see the network at all so I spent a lot of time debugging. I had tested the Pixel 6 and it was the best perfoming UE so I was thinking it was my RAN config that was wrong. I then tested with the Huawei P40 which uses another system than Android and it connected. So I shifted the blame to Android 13. I wanted to roll back the update to maybe Android 10 but then unlike what you did, "I tried nothing but a factory reset to bring 5G back".

So for individuals with nothing to lose on the phones, a reset is the faster way to try get your signal back.

1 reply

rolandmartinson7890 Sep 27, 2023

and to anyone reading, the Factory Reset didnt make the phone revert back to Android 10. It simply reconfigured the phone to "factory default" settings with Android 13. After that do the basics like ##702## and ##4636## already mentioned here.

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COTS dropping connection to gNB #100

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COTS dropping connection to gNB #100

jonniebeeb Jun 16, 2023

Replies: 16 comments · 12 replies

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