[srslte-users] 20MHz support in 5G-NSA

Tue Aug 24 11:14:24 UTC 2021

Hi Isabella,
The error is the following:
```
$ grep "\[E" ue.log
13:40:30.677403 [PHY-NR ] [E] [ 6205] prach_cfg.freq_offset=1 is not
compatible with LTE
13:40:31.825566 [RRC    ] [E] Reconfiguration Failed
13:40:31.825612 [RRC-NR ] [E] Unable to launch NR RRC reconfiguration
procedure
```

Currently, the PRACH signal generator reuses the LTE code which only
accepts LTE standard number of PRB (6, 15, 25, 50, 75, 100). So, the PRACH
offset needs to be set so it fits in the LTE bandwidth.

In other words, you need to modify the gNb parameter prach_freq_offset in
the gnb configuration file. It needs to be at least 3.

Regards,
Xavier

On Tue, 24 Aug 2021 at 11:12, Xavier Arteaga <xavier at srs.io> wrote:

> Hi,
> I need the UE log with all layers in debug level (argument
> --log.all_level=debug) and UE PCAP (if possible).
>
> Many thanks,
>
> Xavier Arteaga
>
> 4G/5G Engineer | Making magic on PHY happen
>
> Software Radio Systems, Ltd.
> xavier at srs.io
> www.srs.io
> Barcelona, Spain
> [image: linkedin] <https://www.linkedin.com/in/xavier-arteaga-a46b4957/>
>
>
> On Mon, 23 Aug 2021 at 16:49, CERUTTI Isabella <
> Isabella.CERUTTI at ec.europa.eu> wrote:
>
>> Dear srsRAN community,
>>
>>
>>
>> Here at Joint Research Centre, we successfully replicated the 5G-NSA
>> testbed consisting of an srsRAN UE (with USRP Ettus X310) connected to an
>> Amarisoft eNB/gNB and core, using the same setting and configuration files
>> provided at:
>>
>>
>> https://docs.srslte.com/en/latest/app_notes/source/5g_nsa/source/index.html
>>
>>
>>
>> Then, we tested with a bandwidth of 20 MHz. The UE connects and transmits
>> as 4G but not as 5G (due to “Scheduling request failed”).
>>
>> Is the 20MHz bandwidth supported and tested for 5G-NSA?
>>
>>
>>
>> Below you can find the setting changes with respect to the 10MHz
>> configuration and the traces. The log files are not included but they can
>> be provided.
>>
>> Any feedback or suggestion is welcome.
>>
>> Thanks and regards,
>>
>>
>>
>>               Isabella
>>
>>
>>
>> ----
>>
>> *SETTING CHANGES FOR 20 MHz BANDWIDTH:*
>>
>> -          Amarisoft gnb configuration file with the following changes:
>>
>> #define N_RB_DL             *100*  // Values: 6 (1.4MHz), 25 (5MHz), 50
>> (10MHz), 75 (15MHz), 100 (20MHz)
>>
>> #define NR_BANDWIDTH        *20*
>>
>> -          The srsUE configuration file has the following changes:
>>
>>         device_args = type=x300,clock=external,sampling_rate=*23.04e6*
>> ,lo_freq_offset_hz=*23.04e6*
>>
>>                      srate = *23.04e6*
>>
>>
>>
>> *-----*
>>
>> *TRACES:*
>>
>>
>>
>> Built in Release mode using commit 89f16eed2 on branch master.
>>
>>
>>
>> Opening 2 channels in RF device=uhd with
>> args=type=x300,clock=external,sampling_rate=23.04e6,lo_freq_offset_hz=23.04e6
>>
>> [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=2, args:
>> type=x300,lo_freq_offset_hz=23.04e6,master_clock_rate=184.32e6
>>
>> [INFO] [UHD RF] RF UHD Generic instance constructed
>>
>> [INFO] [X300] X300 initialization sequence...
>>
>> [INFO] [X300] Maximum frame size: 8000 bytes.
>>
>> [INFO] [X300] Radio 1x clock: 184.32 MHz
>>
>> [INFO] [0/DmaFIFO_0] Initializing block control (NOC ID:
>> 0xF1F0D00000000000)
>>
>> [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1307 MB/s)
>>
>> [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1318 MB/s)
>>
>> [INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
>>
>> [INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
>>
>> [INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
>>
>> [INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
>>
>> [INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
>>
>> [INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
>>
>> [INFO] [MULTI_USRP]     1) catch time transition at pps edge
>>
>> [INFO] [MULTI_USRP]     2) set times next pps (synchronously)
>>
>> Waiting PHY to initialize ... done!
>>
>> Attaching UE...
>>
>> .
>>
>> Found Cell:  Mode=FDD, PCI=1, PRB=100, Ports=1, CFO=-0.1 KHz
>>
>> Found PLMN:  Id=00101, TAC=1
>>
>> Random Access Transmission: seq=27, tti=4014, ra-rnti=0x5
>>
>> Random Access Complete.     c-rnti=0x4612, ta=3
>>
>> RRC Connected
>>
>> Network attach successful. IP: 192.168.3.2
>>
>> Amarisoft Network (Amarisoft) 4/8/2021 13:34:28 TZ:128
>>
>> RRC NR reconfiguration successful.
>>
>> RRC NR reconfiguration failed.
>>
>> RRC Connection Reestablishment to PCI=1, EARFCN=300 (Cause:
>> "reconfigurationFailure")
>>
>> Random Access Transmission: seq=51, tti=5764, ra-rnti=0x5
>>
>> Random Access Complete.     c-rnti=0x4614, ta=3
>>
>> Reestablishment OK
>>
>> RRC Connected
>>
>> RRC NR reconfiguration failed.
>>
>> RRC Connection Reestablishment to PCI=1, EARFCN=300 (Cause:
>> "reconfigurationFailure")
>>
>> Random Access Transmission: seq=36, tti=5834, ra-rnti=0x5
>>
>> Reestablishment OK
>>
>> RRC Connected
>>
>> Random Access Complete.     c-rnti=0x4616, ta=3
>>
>> Received RRC Connection Release (releaseCause: other)
>>
>> RRC IDLE
>>
>> Scheduling request failed: releasing RRC connection...
>>
>> Service Request with cause mo-Data.
>>
>> Random Access Transmission: seq=9, tti=8194, ra-rnti=0x5
>>
>> Random Access Complete.     c-rnti=0x4617, ta=3
>>
>> RRC Connected
>>
>> Service Request successful.
>>
>> RRC NR reconfiguration successful.
>>
>> Scheduling request failed: releasing RRC connection...
>>
>> Received RRC Connection Release (releaseCause: other)
>>
>> RRC IDLE
>>
>> Service Request with cause mo-Data.
>>
>> Random Access Transmission: seq=26, tti=8974, ra-rnti=0x5
>>
>> Random Access Complete.     c-rnti=0x4619, ta=3
>>
>> RRC Connected
>>
>> Service Request successful.
>>
>> RRC NR reconfiguration successful.
>>
>> ^CStopping ..
>>
>> Scheduling request failed: releasing RRC connection...
>>
>> Saving MAC PCAP (DLT=149) to /tmp/ue_mac.pcap
>>
>>
>>
>>
>> _______________________________________________
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>> srslte-users at lists.softwareradiosystems.com
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>>
>
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