1. 13 Feb, 2024 22 commits
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: Push Lopcomm-specific parameters to be per-RU · 206f486e
      Kirill Smelkov authored
      Like e.g. txa0cc00_center_frequency, rxa0cc00_center_frequency_earfcn, etc -
      because different units needs to use different parameters.
      
      cron_schedule is renamed to -> reset_schedule to better reflect its meaning.
      
      user-authorized-key remains to be global as this is per-eNB nor per-RU
      property, but is likely unneded in the future. Corresponding FIXME is added to
      highlight this.
      
      Backward compatibility: no change for ORS; lopcomm parameters become per-cell and need adaptation.
      206f486e
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: Start to generalize the code to handle multiple Radio Units · 0a285a34
      Kirill Smelkov authored
      Add code to organize a registry of Radio Units and handle that registry generally everywhere.
      
      RU registry is still populated from cell_list and in practice there still can
      be radio units only of the same type, but besides slaplte.load_ru_and_cell
      which is aware of that, the rest of the code tries to do everything as if
      RUs of different type could be present simultaneously.
      
      Now it is not only lopcomm who can do multiCELL, but also sunwave and SDR as well.
      
      gNB also starts to gain support for cell_list, because cell_list loading is
      uniformly applied to both eNB and gNB. However, since enb.cfg is not yet
      prepared to handle multiple NR cells yet, there is an assert that in case of NR
      there is only one RU/cell present there. We will remove this limitation in a
      follow-up patch.
      
      Later we will also change the loading to load RU descriptions from shared instances
      and they won't be constrained to be Radio Units of the same type. But we need
      to prepare a lot to be able to do that.
      
      One more step forward towards MultiRU.
      
      Tests will be added later as full tests for generic MultiRU.
      
      Backward compatibility: no change for ORS and practically no breaking change for everything else.
      
      --------
      
      Appendix. Diff for rendered enb.cfg and gnb.cfg before and after this patch:
      
      ```
      $ ./pythonwitheggs slapos-render-config.py && git diff -w --no-index config/{old,out}
      ```
      
      ```diff
      diff --git a/config/old/enb.cfg b/config/out/enb.cfg
      index 884483b0a..cafdf42be 100644
      --- a/config/old/enb.cfg
      +++ b/config/out/enb.cfg
      @@ -1,24 +1,22 @@
      
      -
       {
         log_options: "all.level=error,all.max_size=0,nas.level=debug,nas.max_size=1,s1ap.level=debug,s1ap.max_size=1,x2ap.level=debug,x2ap.max_size=1,rrc.level=debug,rrc.max_size=1,ngap.level=debug,ngap.max_size=1,xnap.level=debug,xnap.max_size=1,phy.level=info,file.rotate=1G,file.path=/dev/null",
         log_filename: "log/enb.log",
      
      -
      +  // Radio Units
         rf_driver: {
      +      // default-RU 2T2R  (ors)
             name: "sdr",
             args: "dev0=/dev/sdr0",
      -
             rx_antenna:"tx_rx",
             tdd_tx_mod: 1,
         },
      -  tx_gain: 62,
      -  rx_gain: 43,
      -
      +  tx_gain: [62, 62],
      +  rx_gain: [43, 43],
         com_addr: "127.0.1.2:9001",
         // LTE core network
         mme_list: [
      @@ -36,6 +34,8 @@
      
         // LTE cells
         cell_list: [
      +
      +    // default  (default-RU)
           {
             rf_port:      0,
             n_antenna_dl: 2,
      diff --git a/config/old/gnb.cfg b/config/out/gnb.cfg
      index fd57ca3dc..7818b4ea8 100644
      --- a/config/old/gnb.cfg
      +++ b/config/out/gnb.cfg
      @@ -1,24 +1,22 @@
      
      -
       {
         log_options: "all.level=error,all.max_size=0,nas.level=debug,nas.max_size=1,s1ap.level=debug,s1ap.max_size=1,x2ap.level=debug,x2ap.max_size=1,rrc.level=debug,rrc.max_size=1,ngap.level=debug,ngap.max_size=1,xnap.level=debug,xnap.max_size=1,phy.level=info,file.rotate=1G,file.path=/dev/null",
         log_filename: "log/enb.log",
      
      -
      +  // Radio Units
         rf_driver: {
      +      // default-RU 2T2R  (ors)
             name: "sdr",
             args: "dev0=/dev/sdr0",
      -
             rx_antenna:"tx_rx",
             tdd_tx_mod: 1,
         },
      -  tx_gain: 62,
      -  rx_gain: 43,
      -
      +  tx_gain: [62, 62],
      +  rx_gain: [43, 43],
         com_addr: "127.0.1.2:9001",
         // NR core network
         amf_list: [
      ```
      0a285a34
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: lte: Fix tdd_ul_dl_config default in schema · 70e23e6d
      Kirill Smelkov authored
      For LTE tdd_ul_dl_config is
      
          enum [
               "[Configuration 2] 5ms 2UL 6DL (default)",
               "[Configuration 6] 5ms 5UL 3DL (maximum uplink)"
          ],
      
      but default was outside of that enum. The code in enb.jinja2.cfg actually uses
      the first option from the enum as the default.
      
      -> Fix default in schema.
      
      tdd_ul_dl_config in NR seems to be already correct.
      70e23e6d
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: cpri_port parameter is unused · 2c9525cb
      Kirill Smelkov authored
      There is cell_list.*.cpri_port_number that is used insted from the beginning.
      
      -> Remove unused cpri_port from scheamas.
      2c9525cb
    • Kirill Smelkov's avatar
      software/ors-amarisoft: ue: Switch UE type to be runtime parameter · e0743e89
      Kirill Smelkov authored
      Previously type of emulated UE was static parameter of particular software
      release - it was possible to simulate UE and attach to cells only of the RAT of
      particular template.
      
      In MultiRU it will be possible to generally emulate all kind of UEs - both LTE
      and NR all at the same time, and attach them to LTE and NR cells
      simultaneously.
      
      -> Switch type of UE to be runtime parameter as a preparatory step for that.
      
      URLs of software releases changes (we remove lte and nr in names), but here we
      do not care about backward compatibility because currently there are just a few
      UEsim deployments and migration should be easy.
      e0743e89
    • Kirill Smelkov's avatar
      software/ors-amarisoft: ue: Reuse SIM object in UE schemas · e5374cdf
      Kirill Smelkov authored
      Less code duplication
      e5374cdf
    • Kirill Smelkov's avatar
      software/ors-amarisoft: Move JSON schema of SIM card to sim/ · 068b712c
      Kirill Smelkov authored
      SIM card object is useful to have not only for Core Network - we will also use
      it for UE configutation. Move SIM schema into common place as a preparatory step.
      068b712c
    • Kirill Smelkov's avatar
      software/ors-amarisoft: ue: Make default K and IMSI to be common for LTE and NR · af96697d
      Kirill Smelkov authored
      K and IMSI are orthogonal to RAT and, similarly to how we keep default
      n_antenna_dl/ul independent of RAT we can do so with this default UE parameters.
      af96697d
    • Kirill Smelkov's avatar
      software/ors-amarisoft: ue: Don't run UEsim tests in ORS mode · 197c4459
      Kirill Smelkov authored
      ORS does not support UEsim as indicated by `if bbu != ors` in software.cfg.json.jinja2.
      
      Amends f3f1cb46 (software/ors-amarisoft: Start to introduce ORS mode) because
      that patch started to really reject instantiating ue-* on ORS.
      197c4459
    • Kirill Smelkov's avatar
      software/ors-amarisoft: ue: Don't render UEsim input schemas for ORS · 198b1113
      Kirill Smelkov authored
      Those were unused because software.cfg.json.jinja2 explicitly enables UEsim only for bbu != 'ors'.
      198b1113
    • Kirill Smelkov's avatar
      software/ors-amarisoft: render-templates: Rework --delete to be precise · 753a9935
      Kirill Smelkov authored
      Soon we are going to make rf_mode a runtime parameter and so there
      won't be TDD and FDD in software names anymore.
      
      Prepare to that and make --delete to remove the exact set of files that
      render-template actually generates instead of becoming a noop after "runtime
      rf_mode" restructuring.
      753a9935
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb+ue: Query slapparameter_dict from master only once · 2149bc2d
      Kirill Smelkov authored
      We are currently querying it in instance.cfg and later, once again, in e.g. instance-enb.jinja2.cfg .
      
      However ORS mode will need to adjust slapparameter_dict with ORS defaults
      and pass it further to generic enb. So it won't work if we use
      slapparameter_dict obtained the second time because the second query will
      return unadjusted original slapparameter_dict.
      
      In this patch we are only doing preparatory step - redo the code not query the
      master from instance-{enb,ue}.jinja2.cfg and work with slapparameter_dict and
      slap_configuration already queried by instance.cfg
      
      For UE the change is trivial.
      
      For eNB instance-enb.jinja2.cfg used to set the defaults for com, mme, amf and
      gtp in the same section used for the second query. We rework those defaults to
      be applied to slapparameter_dict via jinja2 - via the same way we are going to
      later use in ORS mode.
      
      Handling defaults for everything besides gtp_addr is straightforward. For
      gtp_addr it has the semantic difference when explicitly given, and given only
      implicitly. In the latter case the intent of original code is to autodetect
      whether to use an address on loopback, or externally-visible address.
      
      Original code used the check for emptiness of mme_list/amf_list as the
      condition for "use loopback". Since now those lists, after applying their
      defaults, are never empty we rework the code to see if core address is on the
      loopback or not, and use auto-GTP-on-loopback only if core is also on loopback.
      This should, hopefully, be more convenient as it also works ok out of the box
      if core is on loopback, but its address was explicitly specified. Previously
      for such cases gtp_addr was also needed to be specified, and now it should work
      without that.
      
      No change to rendered enb.cfg and gnb.cfg besides whitespace.
      
      Adjust ipv6-random usage in core-network for consistency with enb as well.
      2149bc2d
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: dnsmasq-service :port and :ip are unused and misleading · 86e9a774
      Kirill Smelkov authored
      For example it is the port that is setup in ru/dnsmasq.jinja2.cfg that is used,
      not :port and there it is 5354, i.e. different. :ip is also not used anywhere.
      
      -> Remove them to avoid confusion.
      86e9a774
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb: Rename cell_list -> cell_dict internally · 0f8ee720
      Kirill Smelkov authored
      That data structure is really a dict, not list. It is more clear to name it appropriately.
      
      -> Do the renaming but keep cell_list intact as described in JSON schemas so
         that external interface remains unchanged.
      
      Rendered enb.cfg and gnb.cfg remain the same.
      0f8ee720
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb+ue: Make ru_type and do_lte/do_nr to be accessible at instance level · fbb0d0c1
      Kirill Smelkov authored
      Not only inside rendered enb.jinja2.cfg and ue.jinja2.cfg because we will need
      that information in slaplte and slaplte is imported by instance-enb and
      instance-ue.
      fbb0d0c1
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb+ue: Stop using slap_configuration to propagate LTE and NR defaults · 563a21ca
      Kirill Smelkov authored
      instance-enb and instance-ue currently setup that slap_configuration with
      LTE/NR defaults to be accessible from enb.jinja2.cfg and ue.jinja2.cfg. But we
      will soon need to have access to those defaults from slaplte.jinja2 as well,
      and it will break if left as is because when slaplte is imported from e.g.
      enb.jinja2 - it will work, but when slaplte is imported from instance-enb it
      will break because parent of instance-enb (instance.cfg) does not setup
      defaults in slap_configuration at that level.
      
      The fix is to either duplicate slap_configuration at instance.cfg level, or to
      switch access to the defaults to go via original default_* parameters.
      
      We go the second way for simplicity.
      563a21ca
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb.jinja2.cfg: Switch internal ru.ru_type to be... · 1c0317be
      Kirill Smelkov authored
      software/ors-amarisoft: enb.jinja2.cfg: Switch internal ru.ru_type to be 'sunwave' for Sunwave M2RU Radio Unit
      
      ru/libinstance and everything inside there already refer to that unit as 'sunwave'.
      Do the same for uniformity in enb.cfg and because we already refer to Lopcomm
      ORAN Radio Unit as just 'lopcomm'.
      
      In the future, if we will need to distinguish different models of one
      manufacturer, we could extend ru type to be e.g. manufacturer/model or do
      something similar.
      
      Template rendering is still done with ru='m2ru' coming from outside but
      internally it is now ru.ru_type='sunwave' instead of ru.ru_type='m2ru'.
      1c0317be
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb.jinja2.cfg: Inline cell.bandwidth for now · 4bd14aff
      Kirill Smelkov authored
      Even though I introduced cell object in 79370ebf (software/ors-amarisoft:
      enb.jinja2.cfg: Stop using C Preprocessor and switch to Jinja2 completely) it
      is currently only cell.bandwidth that is living there, while all other cell
      parameters are still fetched from slapparameter_dict directly.
      
      We will soon introduce cell variable - that will iterate over cell_dict, and
      also keeping global cell won't work due to name shadowing. On the other hand we
      are not yet ready to start migrating all cell parameters to be accessible via
      cell object.
      
      -> So inline code for lte bandwidth parameter until the time comes to rework
      all cell parameters to be accessible via cell object.
      
      Rendered enb.cfg and gnb.cfg stay the same.
      4bd14aff
    • Kirill Smelkov's avatar
      software/ors-amarisoft: Move rf_config code from enb.jinja2.cfg -> to slaplte.jinja2 · 4079c440
      Kirill Smelkov authored
      To handle multiple radio units we will need to rework this code significantly.
      Move this to a dedicated routine as a preparatory step. The code moves out of
      enb.cfg because later it will be also used in UEsim to configure simulator
      radio units as well.
      
      No non-whitespace changes in rendered enb.cfg and gnb.cfg .
      
      /cc @jhuge, @lu.xu, @tomo, @xavier_thompson, @Daetalus
      4079c440
    • Kirill Smelkov's avatar
      fixup! software/ors-amarisoft: Start to introduce ORS mode · d7f66afe
      Kirill Smelkov authored
      In f3f1cb46 I've made a mistake in "inject ORS defaults" code - there it should
      be RF.dl_earfcn and RF.dl_nr_arfcn instead of RF.earfcn and RF.nr_arfcn.
      d7f66afe
    • Lu Xu's avatar
      software/end-to-end-testing: ensure cleanup · c16a8274
      Lu Xu authored
      c16a8274
    • Ivan Tyagov's avatar
      Disable warning for time_t type after year 2038 · 10cef4df
      Ivan Tyagov authored
      (irrelevant for the coupler application).
      10cef4df
  2. 09 Feb, 2024 1 commit
  3. 08 Feb, 2024 1 commit
  4. 07 Feb, 2024 3 commits
  5. 05 Feb, 2024 2 commits
  6. 03 Feb, 2024 1 commit
  7. 01 Feb, 2024 4 commits
  8. 31 Jan, 2024 1 commit
  9. 30 Jan, 2024 5 commits
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb.jinja2.cfg: Increase SNR in handover code · 7c3c96e4
      Kirill Smelkov authored
      Don't repeat slapparameter_dict['ncell_list'][k] - we can introduce a name for
      current neighbour cell, and use that name in the loop. And align entries to
      that they read more clearly.
      
      No non-whitespace changes in rendered enb.cfg and gnb.cfg .
      
      /cc @jhuge, @lu.xu, @tomo, @xavier_thompson, @Daetalus
      /proposed-for-review-on nexedi/slapos!1526
      /reviewed-by TrustMe
      7c3c96e4
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb.jinja2.cfg: Factor handover code into one place · 41d23ce2
      Kirill Smelkov authored
      We currently have LTE-specific handover configuration in under cell_list and
      NR-specific handover configuration in under nr_cell_list. Those configuration
      are different.
      
      However in upcoming MultiRU we will need to handle LTE->NR handover, NR->LTE
      handover, and also Intra-ENB handover in addition to Inter-ENB handover we
      currently do.
      
      -> Move handover code into common function as a preparatory step for that.
      
      In the future the handover code for LTE and NR cells will be the same, so it
      makes sense to move that code to common place to avoid duplication.
      
      For rendered enb.cfg this unification introduces only space and trivial
      changes as shown in the appendix.
      
      /cc @jhuge, @lu.xu, @tomo, @xavier_thompson, @Daetalus
      /proposed-for-review-on !1528
      /reviewed-by TrustMe
      
      Appendix. Diff for rendered enb.cfg and gnb.cfg before and after this patch
      
      ```
      $ git diff -w --no-index config/{old,out}
      ```
      
      ```diff
      diff --git a/config/old/enb.cfg b/config/out/enb.cfg
      index 43301ee13..9dcca16c7 100644
      --- a/config/old/enb.cfg
      +++ b/config/out/enb.cfg
      @@ -45,16 +45,18 @@
             root_sequence_index: 204,
             dl_earfcn: 36100,
             inactivity_timer: 10000,
      +
             // Handover
             ncell_list: [
               // Inter-ENB HO
               {
      +          rat: "eutra",
                 n_id_cell: 35,
                 dl_earfcn: 700,
                 cell_id: 0x12345,
                 tac: 123,
      -        }],
      -
      +        },
      +      ],
      
             // Carrier Aggregation
             scell_list: [
      diff --git a/config/old/gnb.cfg b/config/out/gnb.cfg
      index 2127a2f6b..23b07d6e1 100644
      --- a/config/old/gnb.cfg
      +++ b/config/out/gnb.cfg
      @@ -57,6 +57,7 @@
           ssb_pos_bitmap: "10000000",
      
           inactivity_timer: 10000,
      +
             // Handover
             ncell_list: [
               // Inter-ENB HO
      @@ -74,8 +75,8 @@
                 ssb_period: 20,
                 ssb_offset: 0,
                 ssb_duration: 1,
      -      }],
      -
      +        },
      +      ],
      
           // tune NR parameters for the cell
           manual_ref_signal_power: true,
      ```
      41d23ce2
    • Kirill Smelkov's avatar
      software/ors-amarisoft: slapos-render-config: Test handover · 3fd11a89
      Kirill Smelkov authored
      Useful to have while doing handover-related changes.
      
      /cc @jhuge, @lu.xu, @tomo, @xavier_thompson, @Daetalus
      /proposed-for-review-on nexedi/slapos!1528
      /reviewed-by TrustMe
      
      Appendix. Diff for rendered enb.cfg and gnb.cfg before and after this patch
      
      ```
      $ git diff --no-index config/{old,out}
      ```
      
      ```diff
      diff --git a/config/old/enb.cfg b/config/out/enb.cfg
      index 1843e0f24..43301ee13 100644
      --- a/config/old/enb.cfg
      +++ b/config/out/enb.cfg
      @@ -45,6 +45,16 @@
             root_sequence_index: 204,
             dl_earfcn: 36100,
             inactivity_timer: 10000,
      +      // Handover
      +      ncell_list: [
      +        // Inter-ENB HO
      +        {
      +          n_id_cell: 35,
      +          dl_earfcn: 700,
      +          cell_id: 0x12345,
      +          tac: 123,
      +        }],
      +
      
             // Carrier Aggregation
             scell_list: [
      diff --git a/config/old/gnb.cfg b/config/out/gnb.cfg
      index d76b45d3c..2127a2f6b 100644
      --- a/config/old/gnb.cfg
      +++ b/config/out/gnb.cfg
      @@ -57,6 +57,25 @@
           ssb_pos_bitmap: "10000000",
      
           inactivity_timer: 10000,
      +    // Handover
      +    ncell_list: [
      +      // Inter-ENB HO
      +      {
      +        rat: "nr",
      +        dl_nr_arfcn: 520000,
      +        ssb_nr_arfcn: ,
      +        ul_nr_arfcn: 520000,
      +        n_id_cell: 75,
      +        gnb_id_bits: 22,
      +        nr_cell_id: 0x77712,
      +        tac: 321,
      +        band: 38,
      +        ssb_subcarrier_spacing: 30,
      +        ssb_period: 20,
      +        ssb_offset: 0,
      +        ssb_duration: 1,
      +      }],
      +
      ```
      3fd11a89
    • Kirill Smelkov's avatar
      software/ors-amarisoft: enb.jinja2.cfg: Unify logging · 04323c6d
      Kirill Smelkov authored
      1. Currently we have separate log_options for LTE and NR cases with listing
      different subsystems in each. But in MultiRU one enb will be driving both LTE
      and NR cells at the same time, so we will need to define both LTE- and
      NR-related levels.
      
      -> Merge all log settings into one log_options as a preparatory step
      
      For current state it does not hurt for an LTE if we set e.g. ngap.level, and it
      does not hurt for NR if we set e.g. s1ap.level - since those layers will be
      unused. This way merging log settings for both LTE and NR subsystems is ok.
      
      --------
      
      2. Factorize log_phy_debug handling: instead of duplicating whole
      log_options line and changing only phy.level settings there, construct the
      log_options line programmatically and handle phy.level on its own.
      
      --------
      
      3. Use log/enb.log log_filename for both LTE and NR cases. In the upcoming
      MultiRU there might be several cells activated at the same time and in general
      it will be not possible to say are we doing "enb" or "gnb" now - for example if
      there will be two cells - one LTE and one NR.
      
      -> Use enb.log for log filename uniformly similarly to how the software is
      named (lteenb) even though it can work as both enb and gnb.
      
      For the reference we do the same with enb.xlog in nexedi/slapos!1522 .
      
      /cc @jhuge, @lu.xu, @tomo, @xavier_thompson, @Daetalus
      /proposed-for-review-on nexedi/slapos!1527
      /reviewed-by TrustMe
      
      Appendix. Diff for rendered enb.cfg and gnb.cfg before and after this patch
      
      ```
      $ git diff --no-index config/{old,out}
      ```
      
      ```diff
      diff --git a/config/old/enb.cfg b/config/out/enb.cfg
      index 467bb6364..1843e0f24 100644
      --- a/config/old/enb.cfg
      +++ b/config/out/enb.cfg
      @@ -3,9 +3,7 @@
      
       {
      -
      -  log_options: "all.level=error,all.max_size=0,nas.level=debug,nas.max_size=1,s1ap.level=debug,s1ap.max_size=1,x2ap.level=debug,x2ap.max_size=1,rrc.level=debug,rrc.max_size=1,phy.level=info,file.rotate=1G,file.path=/dev/null",
      -
      +  log_options: "all.level=error,all.max_size=0,nas.level=debug,nas.max_size=1,s1ap.level=debug,s1ap.max_size=1,x2ap.level=debug,x2ap.max_size=1,rrc.level=debug,rrc.max_size=1,ngap.level=debug,ngap.max_size=1,xnap.level=debug,xnap.max_size=1,phy.level=info,file.rotate=1G,file.path=/dev/null",
         log_filename: "log/enb.log",
      
      diff --git a/config/old/gnb.cfg b/config/out/gnb.cfg
      index 18523818a..d76b45d3c 100644
      --- a/config/old/gnb.cfg
      +++ b/config/out/gnb.cfg
      @@ -3,10 +3,8 @@
      
       {
      -
      -  log_options: "all.level=error,all.max_size=0,nas.level=debug,nas.max_size=1,ngap.level=debug,ngap.max_size=1,xnap.level=debug,xnap.max_size=1,rrc.level=debug,rrc.max_size=1,phy.level=info,file.rotate=1G,file.path=/dev/null",
      -
      -  log_filename: "log/gnb.log",
      +  log_options: "all.level=error,all.max_size=0,nas.level=debug,nas.max_size=1,s1ap.level=debug,s1ap.max_size=1,x2ap.level=debug,x2ap.max_size=1,rrc.level=debug,rrc.max_size=1,ngap.level=debug,ngap.max_size=1,xnap.level=debug,xnap.max_size=1,phy.level=info,file.rotate=1G,file.path=/dev/null",
      +  log_filename: "log/enb.log",
      
         rf_driver: {
      ```
      04323c6d
    • Kirill Smelkov's avatar
      software/ors-amarisoft: test: Preprocess enb.cfg & co on YAML loading · d8b0a558
      Kirill Smelkov authored
      Current enb config is already quite complex and with MultiRU it will be growing
      more - both with added features and with more sections emitted because there
      will be multiple radio units, multiple cells and cross cell interactions. So
      for clarity we will want to annotate with a comment to which cell or ru object
      a section belongs, or to which cell-cell pair a particular interaction belongs.
      
      Amarisoft supports C-style comments and preprocessor directives out of the box,
      but if we use them in the configuration files, yaml.load, that we use in the
      test to load generated configs, will break, because // and /* ... */ is not
      valid YAML. It looks like Amarisoft does preprocessing as a separate step
      before further loading given configuration via yaml.
      
      So to be able to use the comments and still have tests working we need to do
      the same - in the tests preprocess the files before feeding them to yaml loader.
      
      -> Do that with the help of https://pypi.org/project/pcpp/
      
      In my view that library has good quality and in my experience it worked
      flawlessly. Anyway we need it to only handle comments, not sophisticated CPP
      features, and for that it works just ok.
      
      Add some comments to existing enb.cfg and ue.cfg to make sure it really works.
      Those are simple comments, and in current state it they might seem as not 100%
      necessary, but with more upcoming config changes it would be good to have those
      descriptionary anchors present in the generated configs, so I suggest we add them.
      Anyway they should not do any harm at all.
      
      /cc @jhuge, @lu.xu, @tomo, @xavier_thompson, @Daetalus
      /proposed-for-review-on nexedi/slapos!1526
      /reviewed-by TrustMe
      d8b0a558