[FHI72] Handle long PRACH format

Only static long PRACH configuration verified, i.e. PRACH C-plane
is ignored by the RU.

Note: Introducing `N_ZC` and `num_prbu` parameters is needed for testing
with xran F release. However, in the K release, this information is
stored in xran_rx_packet_ctl struct.

doc/ORAN_FHI7.2_Tutorial.md

@@ -563,6 +563,15 @@ flexran_prach_workaround=disabled
 dl_tuning_special_slot=0x13b6
 ```
 
+In addition, PRACH format 0 is also verified with FW v2.0.5. An example gNB config file can be found at [`gnb.sa.band77.273prb.fhi72.2x2-benetel550-long-prach.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.2x2-benetel550-long-prach.conf). On the RU side, the following parameters shall be modified:
+```bash
+mimo_mode=1_3
+prach_format=long
+prach_freq_offset_dynamic=false
+lf_prach_compression_enable=true
+lf_prach_slot_id=0
+```
+
 #### LITEON
 
 The OAI configuration file [`gnb.sa.band78.273prb.fhi72.4x4-liteon.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x4-liteon.conf) corresponds to:

radio/fhi_72/oaioran.c

@@ -178,6 +178,16 @@ static int read_prach_data(ru_info_t *ru, int frame, int slot)
   struct xran_fh_config *fh_cfg = get_xran_fh_config(0);
   nr_prach_info_t prach_info = get_prach_info(0);
 
+  uint16_t N_ZC, num_prbu;
+  if ((prach_info.format & 0xff) < 4) {
+    N_ZC = 839;
+    num_prbu = 70;
+    prach_info.N_dur = 1;
+  } else {
+    N_ZC = 139;
+    num_prbu = 12;
+  }
+
   int prach_start_sym = prach_info.start_symbol;
   int prach_end_sym = prach_info.N_dur + prach_start_sym;
   struct xran_ru_config *ru_conf = &fh_cfg->ru_conf;
@@ -198,25 +208,25 @@ static int read_prach_data(ru_info_t *ru, int frame, int slot)
         /* convert Network order to host order */
         if (ru_conf->compMeth_PRACH == XRAN_COMPMETHOD_NONE) {
           if (sym_idx == prach_start_sym) {
-            for (idx = 0; idx < 139 * 2; idx++) {
+            for (idx = 0; idx < N_ZC * 2; idx++) {
               dst[idx] = ((int16_t)ntohs(src[idx + g_kbar]));
             }
           } else {
-            for (idx = 0; idx < 139 * 2; idx++) {
+            for (idx = 0; idx < N_ZC * 2; idx++) {
               dst[idx] += ((int16_t)ntohs(src[idx + g_kbar]));
             }
           }
         } else if (ru_conf->compMeth_PRACH == XRAN_COMPMETHOD_BLKFLOAT) {
 
-          int16_t local_dst[12 * 2 * N_SC_PER_PRB] __attribute__((aligned(64)));
+          int16_t local_dst[num_prbu * 2 * N_SC_PER_PRB] __attribute__((aligned(64)));
 
 #if defined(__i386__) || defined(__x86_64__)
           struct xranlib_decompress_request bfp_decom_req = {};
           struct xranlib_decompress_response bfp_decom_rsp = {};
-          int payload_len = (3 * ru_conf->iqWidth_PRACH + 1) * 12; // 12 = closest number of PRBs to 139 REs
+          int payload_len = (3 * ru_conf->iqWidth_PRACH + 1) * num_prbu;
 
           bfp_decom_req.data_in = (int8_t *)src;
-          bfp_decom_req.numRBs = 12; // closest number of PRBs to 139 REs
+          bfp_decom_req.numRBs = num_prbu;
           bfp_decom_req.len = payload_len;
           bfp_decom_req.compMethod = XRAN_COMPMETHOD_BLKFLOAT;
           bfp_decom_req.iqWidth = ru_conf->iqWidth_PRACH;
@@ -225,16 +235,15 @@ static int read_prach_data(ru_info_t *ru, int frame, int slot)
           bfp_decom_rsp.len = 0;
           xranlib_decompress_avx512(&bfp_decom_req, &bfp_decom_rsp);
 #elif defined(__arm__) || defined(__aarch64__)
-          armral_bfp_decompression(ru_conf->iqWidth_PRACH, 12, (int8_t *)src, (int16_t *)local_dst);
+          armral_bfp_decompression(ru_conf->iqWidth_PRACH, num_prbu, (int8_t *)src, (int16_t *)local_dst);
 #else
           AssertFatal(1 == 0, "BFP decompression not supported on this architecture");
 #endif
-          // note: this is hardwired for 139 point PRACH sequence, kbar=2
           if (sym_idx == prach_start_sym)
-            for (idx = 0; idx < (139 * 2); idx++)
+            for (idx = 0; idx < (N_ZC * 2); idx++)
               dst[idx] = local_dst[idx + g_kbar];
           else
-            for (idx = 0; idx < (139 * 2); idx++)
+            for (idx = 0; idx < (N_ZC * 2); idx++)
               dst[idx] += (local_dst[idx + g_kbar]);
         } // COMPMETHOD_BLKFLOAT
       } // aa

targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.2x2-benetel550-long-prach.conf

@@ -0,0 +1,273 @@
+Active_gNBs = ( "gNB-OAI");
+# Asn1_verbosity, choice in: none, info, annoying
+Asn1_verbosity = "none";
+
+gNBs =
+(
+ {
+    ////////// Identification parameters:
+    gNB_ID    =  0xe00;
+    gNB_name  =  "gNB-OAI";
+
+    // Tracking area code, 0x0000 and 0xfffe are reserved values
+    tracking_area_code  =  1;
+    plmn_list = ({ mcc = 208; mnc = 99; mnc_length = 2; snssaiList = ( { sst = 1; }); });
+
+    nr_cellid = 1;
+
+    ////////// Physical parameters:
+
+    pdsch_AntennaPorts_XP = 2;
+    pdsch_AntennaPorts_N1 = 1;
+    maxMIMO_layers        = 2;
+    pusch_AntennaPorts    = 2;
+    do_CSIRS              = 1;
+    do_SRS                = 0;
+
+    servingCellConfigCommon = (
+    {
+ #spCellConfigCommon
+
+      physCellId                                                    = 0;
+     # n_TimingAdvanceOffset                                         = 0;
+#  downlinkConfigCommon
+    #frequencyInfoDL
+      # center frequency = 3950.4 MHz
+      # selected SSB frequency = 3950.4 MHz
+      absoluteFrequencySSB                                          = 663360;
+      dl_frequencyBand                                              = 77;
+      # frequency point A = 3901.26 MHz
+      dl_absoluteFrequencyPointA                                    = 660084;
+      #scs-SpecificCarrierList
+        dl_offstToCarrier                                           = 0;
+# subcarrierSpacing
+# 0=kHz15, 1=kHz30, 2=kHz60, 3=kHz120
+        dl_subcarrierSpacing                                        = 1;
+        dl_carrierBandwidth                                         = 273;
+     #initialDownlinkBWP
+      #genericParameters
+       initialDLBWPlocationAndBandwidth                             = 1099; #38.101-1 Table 5.3.2-1
+       #
+# subcarrierSpacing
+# 0=kHz15, 1=kHz30, 2=kHz60, 3=kHz120
+        initialDLBWPsubcarrierSpacing                               = 1;
+      #pdcch-ConfigCommon
+        initialDLBWPcontrolResourceSetZero                          = 11;
+        initialDLBWPsearchSpaceZero                                 = 0;
+
+  #uplinkConfigCommon
+     #frequencyInfoUL
+      ul_frequencyBand                                              = 77;
+      #scs-SpecificCarrierList
+      ul_offstToCarrier                                             = 0;
+# subcarrierSpacing
+# 0=kHz15, 1=kHz30, 2=kHz60, 3=kHz120
+      ul_subcarrierSpacing                                          = 1;
+      ul_carrierBandwidth                                           = 273;
+      pMax                                                          = 23;
+     #initialUplinkBWP
+      #genericParameters
+        initialULBWPlocationAndBandwidth                            = 1099;
+# subcarrierSpacing
+# 0=kHz15, 1=kHz30, 2=kHz60, 3=kHz120
+        initialULBWPsubcarrierSpacing                               = 1;
+      #rach-ConfigCommon
+        #rach-ConfigGeneric
+          prach_ConfigurationIndex                                  = 7;
+#prach_msg1_FDM
+#0 = one, 1=two, 2=four, 3=eight
+          prach_msg1_FDM                                            = 0;
+          prach_msg1_FrequencyStart                                 = 0;
+          zeroCorrelationZoneConfig                                 = 0;
+          preambleReceivedTargetPower                               = -100;
+#preamblTransMax (0...10) = (3,4,5,6,7,8,10,20,50,100,200)
+          preambleTransMax                                          = 8;
+#powerRampingStep
+# 0=dB0,1=dB2,2=dB4,3=dB6
+        powerRampingStep                                            = 3;
+#ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR
+#1=oneeighth,2=onefourth,3=half,4=one,5=two,6=four,7=eight,8=sixteen
+        ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR                = 3;
+#one (0..15) 4,8,12,16,...60,64
+        ssb_perRACH_OccasionAndCB_PreamblesPerSSB                   = 15;
+#ra_ContentionResolutionTimer
+#(0..7) 8,16,24,32,40,48,56,64
+        ra_ContentionResolutionTimer                                = 7;
+        rsrp_ThresholdSSB                                           = 19;
+#prach-RootSequenceIndex_PR
+#1 = 839, 2 = 139
+        prach_RootSequenceIndex_PR                                  = 1;
+        prach_RootSequenceIndex                                     = 1;
+        # SCS for msg1, can only be 15 for 30 kHz < 6 GHz, takes precendence over the one derived from prach-ConfigIndex
+        #
+        # msg1_SubcarrierSpacing                                      = 1,
+# restrictedSetConfig
+# 0=unrestricted, 1=restricted type A, 2=restricted type B
+        restrictedSetConfig                                         = 0,
+
+# this is the offset between the last PRACH preamble power and the Msg3 PUSCH, 2 times the field value in dB
+        msg3_DeltaPreamble                                          = 2;
+        p0_NominalWithGrant                                         = -96;
+
+# pucch-ConfigCommon setup :
+# pucchGroupHopping
+# 0 = neither, 1= group hopping, 2=sequence hopping
+        pucchGroupHopping                                           = 0;
+        hoppingId                                                   = 0;
+        p0_nominal                                                  = -96;
+
+      ssb_PositionsInBurst_Bitmap                                   = 0x1;
+
+# ssb_periodicityServingCell
+# 0 = ms5, 1=ms10, 2=ms20, 3=ms40, 4=ms80, 5=ms160, 6=spare2, 7=spare1
+      ssb_periodicityServingCell                                    = 2;
+
+# dmrs_TypeA_position
+# 0 = pos2, 1 = pos3
+      dmrs_TypeA_Position                                           = 0;
+
+# subcarrierSpacing
+# 0=kHz15, 1=kHz30, 2=kHz60, 3=kHz120
+      subcarrierSpacing                                             = 1;
+
+
+  #tdd-UL-DL-ConfigurationCommon
+# subcarrierSpacing
+# 0=kHz15, 1=kHz30, 2=kHz60, 3=kHz120
+      referenceSubcarrierSpacing                                    = 1;
+      # pattern1
+      # dl_UL_TransmissionPeriodicity
+      # 0=ms0p5, 1=ms0p625, 2=ms1, 3=ms1p25, 4=ms2, 5=ms2p5, 6=ms5, 7=ms10
+      dl_UL_TransmissionPeriodicity                                 = 6;
+      nrofDownlinkSlots                                             = 7;
+      nrofDownlinkSymbols                                           = 6;
+      nrofUplinkSlots                                               = 2;
+      nrofUplinkSymbols                                             = 4;
+
+  ssPBCH_BlockPower                                                 = -15;
+  }
+  );
+
+
+    # ------- SCTP definitions
+    SCTP :
+    {
+        # Number of streams to use in input/output
+        SCTP_INSTREAMS  = 2;
+        SCTP_OUTSTREAMS = 2;
+    };
+
+
+    ////////// AMF parameters:
+    amf_ip_address = ({ ipv4 = "172.21.6.5";});
+
+    NETWORK_INTERFACES :
+    {
+        GNB_IPV4_ADDRESS_FOR_NG_AMF              = "172.21.16.130";
+        GNB_IPV4_ADDRESS_FOR_NGU                 = "172.21.16.130";
+        GNB_PORT_FOR_S1U                         = 2152; # Spec 2152
+    };
+  }
+);
+
+MACRLCs = (
+{
+  num_cc                      = 1;
+  tr_s_preference             = "local_L1";
+  tr_n_preference             = "local_RRC";
+  pusch_TargetSNRx10          = 180;
+  pucch_TargetSNRx10          = 180;
+#  dl_bler_target_upper        = .35;
+#  dl_bler_target_lower        = .15;
+#  ul_bler_target_upper        = .35;
+#  ul_bler_target_lower        = .15;
+  pusch_FailureThres          = 100;
+  ul_max_mcs                  = 28;
+}
+);
+
+L1s = (
+{
+  num_cc = 1;
+  tr_n_preference = "local_mac";
+  prach_dtx_threshold = 100;
+  pucch0_dtx_threshold = 10;
+  pusch_dtx_threshold = 10;
+  max_ldpc_iterations = 15;
+  tx_amp_backoff_dB = 12; # needs to match O-RU configuration
+  L1_rx_thread_core = 6;
+  L1_tx_thread_core = 7;
+  phase_compensation = 0; # needs to match O-RU configuration
+}
+);
+
+RUs = (
+{
+  local_rf       = "no";
+  nb_tx          = 2;
+  nb_rx          = 2;
+  att_tx         = 0;
+  att_rx         = 0;
+  bands          = [77];
+  max_pdschReferenceSignalPower = -27;
+  max_rxgain                    = 75;
+  sf_extension                  = 0;
+  eNB_instances  = [0];
+  ru_thread_core = 8;
+  sl_ahead       = 5;
+  tr_preference  = "raw_if4p5"; # important: activate FHI7.2
+  do_precoding   = 0; # needs to match O-RU configuration
+}
+);
+
+security = {
+  # preferred ciphering algorithms
+  # the first one of the list that an UE supports in chosen
+  # valid values: nea0, nea1, nea2, nea3
+  ciphering_algorithms = ( "nea0" );
+
+  # preferred integrity algorithms
+  # the first one of the list that an UE supports in chosen
+  # valid values: nia0, nia1, nia2, nia3
+  integrity_algorithms = ( "nia2", "nia0" );
+
+  # setting 'drb_ciphering' to "no" disables ciphering for DRBs, no matter
+  # what 'ciphering_algorithms' configures; same thing for 'drb_integrity'
+  drb_ciphering = "yes";
+  drb_integrity = "no";
+};
+
+log_config :
+{
+  global_log_level = "info";
+  hw_log_level     = "info";
+  phy_log_level    = "info";
+  mac_log_level    = "info";
+  rlc_log_level    = "info";
+  pdcp_log_level   = "info";
+  rrc_log_level    = "info";
+  ngap_log_level   = "info";
+  f1ap_log_level   = "info";
+};
+
+fhi_72 = {
+  dpdk_devices = ("0000:6f:01.0");
+  system_core = 9;
+  io_core = 10;
+  worker_cores = (11);
+  ru_addr = ("8c:1f:64:d1:11:1e");
+  mtu = 9216;
+  fh_config = ({
+    T1a_cp_dl = (419, 470);
+    T1a_cp_ul = (285, 336);
+    T1a_up = (294, 345);
+    Ta4 = (0, 831);
+    ru_config = {
+      iq_width = 9;
+      iq_width_prach = 9;
+    };
+    prach_config = {
+      eAxC_offset = 8;
+    };
+  });
+};