LBT activation

[Fernando Molina]

Hello.

We were trying the MTCAP model, the one with an FPGA.

We were just wondering if LBT is working. I activate everything in the global_conf.json. It says it’s not supported

We upgraded the packet_fwd to a new version, same thing.

Is it possible to upgrade the FPGA in the system to make LBT working?

Thanks

[Jason Reiss]

Upgrading the FPGA is only supported on MTCAP-0.1

admin@mtcap:~# mts-io-sysfs show hw-version
MTCAP-0.1<code></code>admin@mtcap:~# mts-fpga-loader -c
Checking hardware compatibility
Found Valid Hardware: MTCAP-LORA-1.5
Valid FPGA version: 31

FPGA v33 is needed for LBT

admin@mtcap:~# /etc/init.d/lora-network-server stop
admin@mtcap:~# mts-fpga-loader -i /usr/lib/mts-flash-binaries/mtcap-fpga-v33.hex
admin@mtcap:~# mts-fpga-loader -c
Checking hardware compatibility
Found Valid Hardware: MTCAP-LORA-1.5
Valid FPGA version: 33

admin@mtcap:~# /etc/init.d/lora-network-server start

EDIT: FPGA upgrade only on MTCAP-0.1, not MTCAP-0.0

• This reply was modified 5 years, 12 months ago by Jason Reiss.
• This reply was modified 5 years, 12 months ago by Jason Reiss.
• This reply was modified 5 years, 12 months ago by Jason Reiss.

[Jason Reiss]

If mts-fpga-loader utility or mts-flash-binaries are not available on your installation. Upgrade to latest AEP or mLinux.

[Fernando Molina]

There seems to be a problem with my device then:

root@mtcap:~# mts-io-sysfs show hw-version
MTCAP-0.0
root@mtcap:~# mts-fpga-loader -c
Checking hardware compatibility
This software is licensed only for supported MultiTech products.
Version Check failed. Error Code: 3
root@mtcap:~# mts-fpga-loader -i /usr/lib/mts-
mts-flash-binaries/ mts-io-sysfs/
root@mtcap:~# mts-fpga-loader -i /usr/lib/mts-flash-binaries/mtcap-fpga-v3
mtcap-fpga-v31.hex  mtcap-fpga-v33.hex
root@mtcap:~# mts-fpga-loader -i /usr/lib/mts-flash-binaries/mtcap-fpga-v33.hex
Checking hardware compatibility
This software is licensed only for supported MultiTech products.
Upgrade Failed, Error Code: 3

[Fernando Molina]

I could upgrade my MTCDT with that commands.

I don’t know why I cannot upgrade the MTCAP. Faulty device?

[Jason Reiss]

My earlier post mistakenly said the FPGA upgrade was available on MTCAP-0.0 when it is not.

I have modified the earlier post.

MTCAP-0.1 is required to use the mts-fpga-loader. The error message is expected.

[Fernando Molina]

MTCDT-0.0 seems to be upgradable.
Is this right?

Thanks for clarification.

[Jason Reiss]

For MTCDT it depends on the installed card.

MTAC-LORA-1.5 has the FPGA and can be upgraded.
MTAC-LORA-1.0 does not have an FPGA.

[Fernando Molina]

It appears I do something wrong:

        "lbt_cfg": {
            "enable": true,
            "rssi_target": -80,
            "chan_cfg": [
                {"freq_hz":867100000, "scan_time_us":5000},
                {"freq_hz":867300000, "scan_time_us":5000},
                {"freq_hz":867500000, "scan_time_us":5000},
                {"freq_hz":867700000, "scan_time_us":5000},
                {"freq_hz":867900000, "scan_time_us":5000},
                {"freq_hz":868100000, "scan_time_us":5000},
                {"freq_hz":868300000, "scan_time_us":5000},
                {"freq_hz":868500000, "scan_time_us":5000}
            ],
            "sx127x_rssi_offset":-165
         },

When LBT is activated packet_forwarder shows an error “Failed to start the concentrator”. If I turn off LBT packet forwarder works fine.

INFO: Auto-quit after 300 non-acknowledged PULL_DATA
INFO: FPGA supported features: [TX filter]  [Spectral Scan]  [LBT]
ERROR: [main] failed to start the concentrator

Test works fine

Followed this page: http://www.multitech.net/developer/software/lora/listen-before-talk/

• This reply was modified 5 years, 12 months ago by Fernando Molina.
• This reply was modified 5 years, 12 months ago by Fernando Molina.
• This reply was modified 5 years, 12 months ago by Fernando Molina.
• This reply was modified 5 years, 12 months ago by Fernando Molina.
• This reply was modified 5 years, 12 months ago by Fernando Molina.
• This reply was modified 5 years, 12 months ago by Fernando Molina.
• This reply was modified 5 years, 12 months ago by Fernando Molina.

[Jason Reiss]

It appears the v33 LBT firmware does not support frequencies below 915 MHz.

LBT is not required for LoRaWAN use in EU868, LoRaWAN uses duty-cycle.

See lines 125-140. The minimum lbt frequency is pulled from the FPGA firmware. A new FPGA firmware may be needed to support LBT for these frequencies.
https://github.com/Lora-net/lora_gateway/blob/master/libloragw/src/loragw_lbt.c

• This reply was modified 5 years, 12 months ago by Jason Reiss.

[Fernando Molina]

I know it is not required, but as far as I know EU let’s you decide between using LBT or DutyCycle.

Anyway seems that is not a problem of the gateway.

EDIT:
Seems limited by program. FPGA should support it

SX1301_FPGA_200K_NOTCH_LBT_SPECTRAL_SCAN_863_v33.hex:

    200KHz Notch filter for TX (not programmable)
    Listen-Before-Talk for 863+MHz frequency range
    Background Spectral Scan (limited) Note: This image is the same as the 915+MHz version. It is just meant for testing "Japan-like" LBT feature on a EU868 board. It does not provide certified LBT for European band.

Thanks for the answers.

• This reply was modified 5 years, 12 months ago by Fernando Molina.

[Fernando Molina]

Can official FW FPGA versions be burned in Multitech cards with fpga? Just want to check if the v33 posted in git and yours is the same.
EDIT: Git seems to have 2 versions of v33, 915 and 863

• This reply was modified 5 years, 11 months ago by Fernando Molina.

[Jason Reiss]

They are not the same and the mts-fpga-loader utility will not install them.
We may look at including the 863 version of firmware in a future version.

They should be functionally equivalent. The versions installed on the Conduit have unique signatures that are verified by the mts-fpga-loader utility.

• This reply was modified 5 years, 11 months ago by Jason Reiss.

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