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  1. 28 May, 2019 1 commit
  2. 05 Apr, 2019 1 commit
  3. 19 Mar, 2019 4 commits
    • Cedric Roux's avatar
      PHY: add parameter end_of_burst_delay for TDD · 275e5b3a
      Cedric Roux authored
      end_of_burst_delay is used to stop TX only "after a while".
      If we stop right after effective signal, with USRP B210 and
      B200mini, we observe a high EVM on the S subframe (on the
      PSS).
      A value of 400 (for 30.72MHz) solves this issue. This is
      the default.
      
      This default value can be changed in the configuration file.
      For example:
      
      RUs = (
          {
             local_rf       = "yes"
               nb_tx          = 1
               nb_rx          = 1
               att_tx         = 20
               att_rx         = 0;
               bands          = [7];
               max_pdschReferenceSignalPower = -27;
               max_rxgain                    = 105;
               eNB_instances  = [0];
               sf_extension = 312;
               end_of_burst_delay = 200;
          }
      );
      
      Here we would set a value of 200.
      
      The value to put in the configuration file is for
      30.72MHz. The value is scaled accordingly at runtime
      (thus only one value to set for every RB configuration,
      25, 50 or 100, leading to less problems when adapting
      configuration files).
      
      This option is for experts and should not be changed
      randomly.
      275e5b3a
    • Cedric Roux's avatar
      PHY: bugfix: compute start/end of burst correctly for TDD · a05753df
      Cedric Roux authored
      Start of burst is to start TDD DL transmission in the driver
      (tested with USRP for the moment).
      
      End of burst is to stop DL transmission.
      
      Start of burst can only happen for a DL subframe when the
      previous subframe was an UL subframe.
      
      End of burst can only happen for an S subframe.
      
      It's impossible for a subframe to be both the start of a burst
      and the end of a burst.
      
      This can be checked with eg. http://niviuk.free.fr/lte_resource_grid.html
      (or reading the specs).
      a05753df
    • Cedric Roux's avatar
    • Cedric Roux's avatar
      PHY: make sf_extension a parameter · ee5b7390
      Cedric Roux authored
      This parameter is meaningful in TDD, to decide
      when to start DL at eNB side. Since there is a
      need for the PA to be operational, we need to
      transmit a bit before the DL subframe coming
      after an UL subframe. (We transmit zeros.)
      
      We used to use N_TA_offset which may be too much.
      Default value is now N_TA_offset/2 and can be
      changed in the configuration file, in the RUs
      section, like:
      
      RUs = (
          {
             local_rf       = "yes"
               nb_tx          = 1
               nb_rx          = 1
               att_tx         = 0
               att_rx         = 0;
               bands          = [7];
               max_pdschReferenceSignalPower = -27;
               max_rxgain                    = 105;
               eNB_instances  = [0];
               sf_extension = 312;
          }
      );
      
      N_TA_offset is 624 (for 30.72MHz). In the example
      above, we set sf_extension = 312, which is also
      the default.
      
      The value to put in the configuration file is for
      30.72MHz. The value is scaled accordingly at runtime
      (thus only one value to set for every RB configuration,
      25, 50 or 100, leading to less problems when adapting
      configuration files).
      
      This option is for experts and should not be changed
      randomly.
      ee5b7390
  4. 09 Mar, 2019 1 commit
  5. 04 Mar, 2019 1 commit
  6. 25 Feb, 2019 1 commit
  7. 22 Feb, 2019 1 commit
  8. 17 Feb, 2019 1 commit
  9. 12 Feb, 2019 1 commit
  10. 22 Jan, 2019 1 commit
  11. 07 Jan, 2019 1 commit
    • Cedric Roux's avatar
      fix a lot of file mode · aea6b4b5
      Cedric Roux authored
      For whatever reason most of the files had their permission
      changed from 644 to 755, which is not wanted.
      aea6b4b5
  12. 19 Dec, 2018 1 commit
  13. 05 Dec, 2018 1 commit
  14. 08 Nov, 2018 1 commit
  15. 05 Nov, 2018 1 commit
  16. 02 Nov, 2018 1 commit
  17. 30 Oct, 2018 1 commit
  18. 26 Oct, 2018 2 commits
  19. 25 Oct, 2018 1 commit
  20. 24 Oct, 2018 1 commit
  21. 22 Oct, 2018 1 commit
  22. 17 Oct, 2018 2 commits
  23. 14 Sep, 2018 1 commit
    • Cedric Roux's avatar
      basic simulator: support TDD mode · 824f62d8
      Cedric Roux authored
      For whatever reason we need N_TA_offset to be 0 for the basic simulator
      to function properly.
      
      This is more a hack than a proper solution. More analysis is needed
      to understand what happens and what should be really done.
      824f62d8
  24. 13 Sep, 2018 1 commit
  25. 11 Sep, 2018 1 commit
  26. 03 Sep, 2018 2 commits
    • Robert Schmidt's avatar
      Correctly join RU threads · f0670154
      Robert Schmidt authored
      * join pthread_FH (ru_thread) once all condition variables have been set
      * join RU FHTX only if it has been started (check as for pthread_create())
      * join PRACH thread in the monolithic case
      * send broadcast on condition variable cond_eNBs, as there can be multiple
        waits on it
      * integrate stop_ru(*ru) into kill_RU_proc(*ru)
      * Correct memory freeing
      f0670154
    • Robert Schmidt's avatar
  27. 31 Aug, 2018 1 commit
  28. 24 Aug, 2018 1 commit
  29. 16 Aug, 2018 1 commit
    • Eino Virtanen's avatar
      USRP addressess and clock sources can be configured in the configuration file... · be0e4095
      Eino Virtanen authored
      USRP addressess and clock sources can be configured in the configuration file with the RU section with comma separated IP addresses in 'sdr_addrs' and with strings "internal"/"external"/"gpsdo" in 'clock_src'.
      
      TODO: Currently the driver picks the two first RX and TX channels when nb_tx and nb_rx are both set to 2. If a developers wants to force usage of two devices, 'set_rx_subdev_spec' and 'set_tx_subdev_spec' can be used to indicate to the driver so that antennas from separate devices will be used. To rephrase: until 4 antennas are supported by OAI, testing with two devices, so that antennas from both devices are used, requires manual configuration of which subdevices' antennas are used.
      
      Conflicts:
      	targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
      be0e4095
  30. 10 Aug, 2018 1 commit
  31. 03 Aug, 2018 1 commit
  32. 30 Jul, 2018 2 commits
  33. 13 Jul, 2018 1 commit