Yate Community Forum

OpenLTE => YateBTS => Topic started by: tsarik on December 30, 2014, 11:18:27 PM

Title: bladeRF rssi issues
Post by: tsarik on December 30, 2014, 11:18:27 PM

Hello,
can anyone please help with few questions:
1. network not always appear in list on phone
2. even if its appear registration can take few minutes (tested on different models)
3. why RSSI level on phone never change, it always shows same value after it registered, lets say -48 db even when i'm 30 meters away

I guess transceiver settings should be adjusted like:
MinimumRxRSSI=-63
Radio.PowerManager.MaxAttenDB=5
and something else but I have no idea about those values....

 
bladeRF firmware & FPGA used from ./mbts/TransceiverRAD1




Please, guys, any suggestions.

Title: Re: bladeRF rssi issues
Post by: habibur333 on December 31, 2014, 05:51:33 AM

Hi Tsarik
Please mention the OS version, device model and
bladeRF> version
thanks .

Title: Re: bladeRF rssi issues
Post by: tsarik on December 31, 2014, 08:19:44 AM

Quote from: habibur333 on December 31, 2014, 05:51:33 AM

Hi Tsarik
Please mention the OS version, device model and
bladeRF> version
thanks .

hi
ubuntu 14.04.4 x64
bladerf x115

tried both configuration:
1. lib/firmwares used from yatebts     (ibbladeRF from http://repo.yatebts.com/devel/bladeRF.tar.gz and flash the board with the firmware.img from our SVN directory mbts/TransceiverRAD1)

  bladeRF-cli version:        0.10.7-git-unknown
  libbladeRF version:         0.14.0-git-unknown

  Firmware version:           1.6.1-git-053fb13-buildomatic
  FPGA version:                 0.0.3


2. latest version, with applied patch for bladeRFDevice.cpp      http://pastebin.com/G1Y32Z9a
  bladeRF-cli version:        1.1.0-2014.12-rc1-1-ppatrusty
  libbladeRF version:         1.1.0-2014.12-rc1-1-ppatrusty

  Firmware version:           1.8.0
  FPGA version:               0.1.2

Title: Re: bladeRF rssi issues
Post by: paulc on January 13, 2015, 01:02:25 PM

Quote

1. network not always appear in list on phone
2. even if its appear registration can take few minutes (tested on different models)

This suggests the frequency is not calibrated. Mobile networks are very sensitive to frequency, especially when signals from several base stations can be received.
https://github.com/Nuand/kalibrate-bladeRF (https://github.com/Nuand/kalibrate-bladeRF)
http://wiki.yatebts.com/index.php/Configuration_Commands#freqcorr (http://wiki.yatebts.com/index.php/Configuration_Commands#freqcorr)
http://wiki.yatebts.com/index.php/Ybts.conf#.5Btransceiver.5D_Controls_how_to_start_and_operate_the_radio_transceiver (http://wiki.yatebts.com/index.php/Ybts.conf#.5Btransceiver.5D_Controls_how_to_start_and_operate_the_radio_transceiver)

Quote

3. why RSSI level on phone never change, it always shows same value after it registered, lets say -48 db even when i'm 30 meters away

Where and when do you see this RSSI level? Does the phone you use have some field test mode?