[srsran-users] Unable to connect SRS UE to private network

[Liam Fruzyna]

Hi,

I am attempting to connect the SRS UE to a private (non-SRS) network. I am
currently using LTE on channel 3350 and while I can attach a normal handset
without issue, I cannot attach the SRS UE. When the network replies to the
RRC Connection Request with an RRC Connection Setup, no response is
received by the network. This is because the UE appears to not to receive
the RRC Connection Setup and times out. Are there any logging techniques
that can help us confirm if the message is being received at all and where
the failure might be? Or any insight into why this problem is occurring?

I have attached copies of the RRC Connection Setup message, PCAP file, and
console output.

I should also note I am primarily using a USRP B200 mini, but have also
replicated this result with a B210 and X300.

Thanks,
Liam

-- 


*For more information on how and why we collect your personal 
information, please visit our Privacy Policy 
<https://www.motorolasolutions.com/en_us/about/privacy-policy.html?elqTrackId=8980d888905940e39a2613a7a3dcb0a7&elqaid=2786&elqat=2#privacystatement>.*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20220405/4139e38c/attachment.htm>
-------------- next part --------------
{
	message c1: rrcConnectionSetup: {
		rrc - TransactionIdentifier 0,
		criticalExtensions c1: rrcConnectionSetup - r8: {
			radioResourceConfigDedicated {
				srb - ToAddModList {
					{
						srb - Identity 1,
						rlc - Config explicitValue: am: {
							ul - AM - RLC {
								t - PollRetransmit ms45, pollPDU pInfinity, pollByte kBinfinity, maxRetxThreshold t32
							},
							dl - AM - RLC {
								t - Reordering ms35, t - StatusProhibit ms10
							}
						},
						logicalChannelConfig explicitValue: {
							ul - SpecificParameters {
								priority 1, prioritisedBitRate infinity, bucketSizeDuration ms50, logicalChannelGroup 0
							}
						}
					}
				},
				mac - MainConfig explicitValue: {
					ul - SCH - Config {
						maxHARQ - Tx n1, periodicBSR - Timer sf5, retxBSR - Timer sf320, ttiBundling FALSE
					},
					drx - Config release: NULL,
					timeAlignmentTimerDedicated infinity,
					phr - Config setup: {
						periodicPHR - Timer sf100,
						prohibitPHR - Timer sf1000,
						dl - PathlossChange dB3
					}
				},
				physicalConfigDedicated {
					pdsch - ConfigDedicated {
						p - a dB0
					},
					pusch - ConfigDedicated {
						betaOffset - ACK - Index 6, betaOffset - RI - Index 8, betaOffset - CQI - Index 3
					},
					uplinkPowerControlDedicated {
						p0 - UE - PUSCH 0, deltaMCS - Enabled en0, accumulationEnabled TRUE, p0 - UE - PUCCH - 8, pSRS - Offset 7, filterCoefficient fc4
					},
					cqi - ReportConfig {
						cqi - ReportModeAperiodic rm30, nomPDSCH - RS - EPRE - Offset 0, cqi - ReportPeriodic release: NULL
					},
					antennaInfo explicitValue: {
						transmissionMode tm2,
						ue - TransmitAntennaSelection release: NULL
					},
					schedulingRequestConfig setup: {
						sr - PUCCH - ResourceIndex 123,
						sr - ConfigIndex 86,
						dsr - TransMax n64
					}
				}
			}
		}
	}
}
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ue_mac.pcap
Type: application/octet-stream
Size: 4386 bytes
Desc: not available
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20220405/4139e38c/attachment.obj>
-------------- next part --------------
Couldn't open , trying /root/.config/srsran/ue.conf
Reading configuration file /root/.config/srsran/ue.conf...

Built in Release mode using commit 5275f3336 on branch master.

Opening 1 channels in RF device=default with args=default
Available RF device list: UHD 
Trying to open RF device 'UHD'
[INFO] [UHD] linux; GNU C++ version 9.2.1 20200304; Boost_107100; UHD_3.15.0.0-2build5
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[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] Asking for clock rate 23.040000 MHz... 
[INFO] [B200] Actually got clock rate 23.040000 MHz.
RF device 'UHD' successfully opened
Waiting PHY to initialize ... done!
Attaching UE...
.
Found Cell:  Mode=FDD, PCI=1, PRB=50, Ports=2, CP=Normal, CFO=3.4 KHz
Found PLMN:  Id=00101, TAC=1
Found PLMN:  Id=10101, TAC=1
Random Access Transmission: seq=31, tti=661, ra-rnti=0x2
Random Access Transmission: seq=22, tti=691, ra-rnti=0x2
Random Access Transmission: seq=24, tti=721, ra-rnti=0x2
Random Access Transmission: seq=28, tti=751, ra-rnti=0x2
Random Access Transmission: seq=31, tti=781, ra-rnti=0x2
Random Access Transmission: seq=5, tti=811, ra-rnti=0x2
Random Access Transmission: seq=31, tti=841, ra-rnti=0x2
Random Access Transmission: seq=15, tti=871, ra-rnti=0x2
Random Access Transmission: seq=12, tti=901, ra-rnti=0x2
Random Access Transmission: seq=17, tti=931, ra-rnti=0x2
Random Access Transmission: seq=6, tti=961, ra-rnti=0x2
Random Access Transmission: seq=6, tti=991, ra-rnti=0x2
Random Access Transmission: seq=5, tti=1021, ra-rnti=0x2
Random Access Transmission: seq=7, tti=1051, ra-rnti=0x2
Random Access Transmission: seq=14, tti=1081, ra-rnti=0x2
Random Access Transmission: seq=24, tti=1111, ra-rnti=0x2
Random Access Transmission: seq=19, tti=1141, ra-rnti=0x2
Random Access Transmission: seq=26, tti=1171, ra-rnti=0x2
Random Access Transmission: seq=23, tti=1201, ra-rnti=0x2
Random Access Transmission: seq=29, tti=1231, ra-rnti=0x2
Attach failed (attempt 1/5)